Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * CFQ, or complete fairness queueing, disk scheduler. |
| 3 | * |
| 4 | * Based on ideas from a previously unfinished io |
| 5 | * scheduler (round robin per-process disk scheduling) and Andrea Arcangeli. |
| 6 | * |
Jens Axboe | 0fe2347 | 2006-09-04 15:41:16 +0200 | [diff] [blame] | 7 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/slab.h> |
Al Viro | 1cc9be6 | 2006-03-18 12:29:52 -0500 | [diff] [blame] | 11 | #include <linux/blkdev.h> |
| 12 | #include <linux/elevator.h> |
Randy Dunlap | ad5ebd2 | 2009-11-11 13:47:45 +0100 | [diff] [blame] | 13 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/rbtree.h> |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 15 | #include <linux/ioprio.h> |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 16 | #include <linux/blktrace_api.h> |
Tejun Heo | 6e736be | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 17 | #include "blk.h" |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 18 | #include "blk-cgroup.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | /* |
| 21 | * tunables |
| 22 | */ |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 23 | /* max queue in one round of service */ |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 24 | static const int cfq_quantum = 8; |
Arjan van de Ven | 6410009 | 2006-01-06 09:46:02 +0100 | [diff] [blame] | 25 | static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 26 | /* maximum backwards seek, in KiB */ |
| 27 | static const int cfq_back_max = 16 * 1024; |
| 28 | /* penalty of a backwards seek */ |
| 29 | static const int cfq_back_penalty = 2; |
Arjan van de Ven | 6410009 | 2006-01-06 09:46:02 +0100 | [diff] [blame] | 30 | static const int cfq_slice_sync = HZ / 10; |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 31 | static int cfq_slice_async = HZ / 25; |
Arjan van de Ven | 6410009 | 2006-01-06 09:46:02 +0100 | [diff] [blame] | 32 | static const int cfq_slice_async_rq = 2; |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 33 | static int cfq_slice_idle = HZ / 125; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 34 | static int cfq_group_idle = HZ / 125; |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 35 | static const int cfq_target_latency = HZ * 3/10; /* 300 ms */ |
| 36 | static const int cfq_hist_divisor = 4; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 37 | |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 38 | /* |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 39 | * offset from end of service tree |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 40 | */ |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 41 | #define CFQ_IDLE_DELAY (HZ / 5) |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 42 | |
| 43 | /* |
| 44 | * below this threshold, we consider thinktime immediate |
| 45 | */ |
| 46 | #define CFQ_MIN_TT (2) |
| 47 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 48 | #define CFQ_SLICE_SCALE (5) |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 49 | #define CFQ_HW_QUEUE_MIN (5) |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 50 | #define CFQ_SERVICE_SHIFT 12 |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 51 | |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 52 | #define CFQQ_SEEK_THR (sector_t)(8 * 100) |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 53 | #define CFQQ_CLOSE_THR (sector_t)(8 * 1024) |
Corrado Zoccolo | 41647e7 | 2010-02-27 19:45:40 +0100 | [diff] [blame] | 54 | #define CFQQ_SECT_THR_NONROT (sector_t)(2 * 32) |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 55 | #define CFQQ_SEEKY(cfqq) (hweight32(cfqq->seek_history) > 32/8) |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 56 | |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 57 | #define RQ_CIC(rq) icq_to_cic((rq)->elv.icq) |
| 58 | #define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elv.priv[0]) |
| 59 | #define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elv.priv[1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 61 | static struct kmem_cache *cfq_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 63 | #define CFQ_PRIO_LISTS IOPRIO_BE_NR |
| 64 | #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 65 | #define cfq_class_rt(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_RT) |
| 66 | |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 67 | #define sample_valid(samples) ((samples) > 80) |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 68 | #define rb_entry_cfqg(node) rb_entry((node), struct cfq_group, rb_node) |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 69 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 70 | struct cfq_ttime { |
| 71 | unsigned long last_end_request; |
| 72 | |
| 73 | unsigned long ttime_total; |
| 74 | unsigned long ttime_samples; |
| 75 | unsigned long ttime_mean; |
| 76 | }; |
| 77 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 78 | /* |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 79 | * Most of our rbtree usage is for sorting with min extraction, so |
| 80 | * if we cache the leftmost node we don't have to walk down the tree |
| 81 | * to find it. Idea borrowed from Ingo Molnars CFS scheduler. We should |
| 82 | * move this into the elevator for the rq sorting as well. |
| 83 | */ |
| 84 | struct cfq_rb_root { |
| 85 | struct rb_root rb; |
| 86 | struct rb_node *left; |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 87 | unsigned count; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 88 | u64 min_vdisktime; |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 89 | struct cfq_ttime ttime; |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 90 | }; |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 91 | #define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT, \ |
| 92 | .ttime = {.last_end_request = jiffies,},} |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 93 | |
| 94 | /* |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 95 | * Per process-grouping structure |
| 96 | */ |
| 97 | struct cfq_queue { |
| 98 | /* reference count */ |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 99 | int ref; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 100 | /* various state flags, see below */ |
| 101 | unsigned int flags; |
| 102 | /* parent cfq_data */ |
| 103 | struct cfq_data *cfqd; |
| 104 | /* service_tree member */ |
| 105 | struct rb_node rb_node; |
| 106 | /* service_tree key */ |
| 107 | unsigned long rb_key; |
| 108 | /* prio tree member */ |
| 109 | struct rb_node p_node; |
| 110 | /* prio tree root we belong to, if any */ |
| 111 | struct rb_root *p_root; |
| 112 | /* sorted list of pending requests */ |
| 113 | struct rb_root sort_list; |
| 114 | /* if fifo isn't expired, next request to serve */ |
| 115 | struct request *next_rq; |
| 116 | /* requests queued in sort_list */ |
| 117 | int queued[2]; |
| 118 | /* currently allocated requests */ |
| 119 | int allocated[2]; |
| 120 | /* fifo list of requests in sort_list */ |
| 121 | struct list_head fifo; |
| 122 | |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 123 | /* time when queue got scheduled in to dispatch first request. */ |
| 124 | unsigned long dispatch_start; |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 125 | unsigned int allocated_slice; |
Richard Kennedy | c4081ba | 2010-02-22 13:49:24 +0100 | [diff] [blame] | 126 | unsigned int slice_dispatch; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 127 | /* time when first request from queue completed and slice started. */ |
| 128 | unsigned long slice_start; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 129 | unsigned long slice_end; |
| 130 | long slice_resid; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 131 | |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 132 | /* pending priority requests */ |
| 133 | int prio_pending; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 134 | /* number of requests that are on the dispatch list or inside driver */ |
| 135 | int dispatched; |
| 136 | |
| 137 | /* io prio of this group */ |
| 138 | unsigned short ioprio, org_ioprio; |
Justin TerAvest | 4aede84 | 2011-07-12 08:31:45 +0200 | [diff] [blame] | 139 | unsigned short ioprio_class; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 140 | |
Richard Kennedy | c4081ba | 2010-02-22 13:49:24 +0100 | [diff] [blame] | 141 | pid_t pid; |
| 142 | |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 143 | u32 seek_history; |
Jeff Moyer | b2c18e1 | 2009-10-23 17:14:49 -0400 | [diff] [blame] | 144 | sector_t last_request_pos; |
| 145 | |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 146 | struct cfq_rb_root *service_tree; |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 147 | struct cfq_queue *new_cfqq; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 148 | struct cfq_group *cfqg; |
Vivek Goyal | c4e7893 | 2010-08-23 12:25:03 +0200 | [diff] [blame] | 149 | /* Number of sectors dispatched from queue in single dispatch round */ |
| 150 | unsigned long nr_sectors; |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 151 | }; |
| 152 | |
| 153 | /* |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 154 | * First index in the service_trees. |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 155 | * IDLE is handled separately, so it has negative index |
| 156 | */ |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 157 | enum wl_class_t { |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 158 | BE_WORKLOAD = 0, |
Vivek Goyal | 615f025 | 2009-12-03 12:59:39 -0500 | [diff] [blame] | 159 | RT_WORKLOAD = 1, |
| 160 | IDLE_WORKLOAD = 2, |
Vivek Goyal | b462732 | 2010-10-22 09:48:43 +0200 | [diff] [blame] | 161 | CFQ_PRIO_NR, |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 162 | }; |
| 163 | |
| 164 | /* |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 165 | * Second index in the service_trees. |
| 166 | */ |
| 167 | enum wl_type_t { |
| 168 | ASYNC_WORKLOAD = 0, |
| 169 | SYNC_NOIDLE_WORKLOAD = 1, |
| 170 | SYNC_WORKLOAD = 2 |
| 171 | }; |
| 172 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 173 | struct cfqg_stats { |
| 174 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 175 | /* total bytes transferred */ |
| 176 | struct blkg_rwstat service_bytes; |
| 177 | /* total IOs serviced, post merge */ |
| 178 | struct blkg_rwstat serviced; |
| 179 | /* number of ios merged */ |
| 180 | struct blkg_rwstat merged; |
| 181 | /* total time spent on device in ns, may not be accurate w/ queueing */ |
| 182 | struct blkg_rwstat service_time; |
| 183 | /* total time spent waiting in scheduler queue in ns */ |
| 184 | struct blkg_rwstat wait_time; |
| 185 | /* number of IOs queued up */ |
| 186 | struct blkg_rwstat queued; |
| 187 | /* total sectors transferred */ |
| 188 | struct blkg_stat sectors; |
| 189 | /* total disk time and nr sectors dispatched by this group */ |
| 190 | struct blkg_stat time; |
| 191 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 192 | /* time not charged to this cgroup */ |
| 193 | struct blkg_stat unaccounted_time; |
| 194 | /* sum of number of ios queued across all samples */ |
| 195 | struct blkg_stat avg_queue_size_sum; |
| 196 | /* count of samples taken for average */ |
| 197 | struct blkg_stat avg_queue_size_samples; |
| 198 | /* how many times this group has been removed from service tree */ |
| 199 | struct blkg_stat dequeue; |
| 200 | /* total time spent waiting for it to be assigned a timeslice. */ |
| 201 | struct blkg_stat group_wait_time; |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 202 | /* time spent idling for this blkcg_gq */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 203 | struct blkg_stat idle_time; |
| 204 | /* total time with empty current active q with other requests queued */ |
| 205 | struct blkg_stat empty_time; |
| 206 | /* fields after this shouldn't be cleared on stat reset */ |
| 207 | uint64_t start_group_wait_time; |
| 208 | uint64_t start_idle_time; |
| 209 | uint64_t start_empty_time; |
| 210 | uint16_t flags; |
| 211 | #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
| 212 | #endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
| 213 | }; |
| 214 | |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 215 | /* This is per cgroup per device grouping structure */ |
| 216 | struct cfq_group { |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 217 | /* must be the first member */ |
| 218 | struct blkg_policy_data pd; |
| 219 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 220 | /* group service_tree member */ |
| 221 | struct rb_node rb_node; |
| 222 | |
| 223 | /* group service_tree key */ |
| 224 | u64 vdisktime; |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 225 | |
| 226 | /* |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 227 | * The number of active cfqgs and sum of their weights under this |
| 228 | * cfqg. This covers this cfqg's leaf_weight and all children's |
| 229 | * weights, but does not cover weights of further descendants. |
| 230 | * |
| 231 | * If a cfqg is on the service tree, it's active. An active cfqg |
| 232 | * also activates its parent and contributes to the children_weight |
| 233 | * of the parent. |
| 234 | */ |
| 235 | int nr_active; |
| 236 | unsigned int children_weight; |
| 237 | |
| 238 | /* |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 239 | * vfraction is the fraction of vdisktime that the tasks in this |
| 240 | * cfqg are entitled to. This is determined by compounding the |
| 241 | * ratios walking up from this cfqg to the root. |
| 242 | * |
| 243 | * It is in fixed point w/ CFQ_SERVICE_SHIFT and the sum of all |
| 244 | * vfractions on a service tree is approximately 1. The sum may |
| 245 | * deviate a bit due to rounding errors and fluctuations caused by |
| 246 | * cfqgs entering and leaving the service tree. |
| 247 | */ |
| 248 | unsigned int vfraction; |
| 249 | |
| 250 | /* |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 251 | * There are two weights - (internal) weight is the weight of this |
| 252 | * cfqg against the sibling cfqgs. leaf_weight is the wight of |
| 253 | * this cfqg against the child cfqgs. For the root cfqg, both |
| 254 | * weights are kept in sync for backward compatibility. |
| 255 | */ |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 256 | unsigned int weight; |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 257 | unsigned int new_weight; |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 258 | unsigned int dev_weight; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 259 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 260 | unsigned int leaf_weight; |
| 261 | unsigned int new_leaf_weight; |
| 262 | unsigned int dev_leaf_weight; |
| 263 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 264 | /* number of cfqq currently on this group */ |
| 265 | int nr_cfqq; |
| 266 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 267 | /* |
Kyungmin Park | 4495a7d | 2011-05-31 10:04:09 +0200 | [diff] [blame] | 268 | * Per group busy queues average. Useful for workload slice calc. We |
Vivek Goyal | b462732 | 2010-10-22 09:48:43 +0200 | [diff] [blame] | 269 | * create the array for each prio class but at run time it is used |
| 270 | * only for RT and BE class and slot for IDLE class remains unused. |
| 271 | * This is primarily done to avoid confusion and a gcc warning. |
| 272 | */ |
| 273 | unsigned int busy_queues_avg[CFQ_PRIO_NR]; |
| 274 | /* |
| 275 | * rr lists of queues with requests. We maintain service trees for |
| 276 | * RT and BE classes. These trees are subdivided in subclasses |
| 277 | * of SYNC, SYNC_NOIDLE and ASYNC based on workload type. For IDLE |
| 278 | * class there is no subclassification and all the cfq queues go on |
| 279 | * a single tree service_tree_idle. |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 280 | * Counts are embedded in the cfq_rb_root |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 281 | */ |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 282 | struct cfq_rb_root service_trees[2][3]; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 283 | struct cfq_rb_root service_tree_idle; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 284 | |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 285 | unsigned long saved_wl_slice; |
| 286 | enum wl_type_t saved_wl_type; |
| 287 | enum wl_class_t saved_wl_class; |
Tejun Heo | 4eef304 | 2012-03-05 13:15:18 -0800 | [diff] [blame] | 288 | |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 289 | /* number of requests that are on the dispatch list or inside driver */ |
| 290 | int dispatched; |
Shaohua Li | 7700fc4 | 2011-07-12 14:24:56 +0200 | [diff] [blame] | 291 | struct cfq_ttime ttime; |
Tejun Heo | 0b39920 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 292 | struct cfqg_stats stats; /* stats for this cfqg */ |
| 293 | struct cfqg_stats dead_stats; /* stats pushed from dead children */ |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 294 | }; |
| 295 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 296 | struct cfq_io_cq { |
| 297 | struct io_cq icq; /* must be the first member */ |
| 298 | struct cfq_queue *cfqq[2]; |
| 299 | struct cfq_ttime ttime; |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 300 | int ioprio; /* the current ioprio */ |
| 301 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 302 | uint64_t blkcg_id; /* the current blkcg ID */ |
| 303 | #endif |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 304 | }; |
| 305 | |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 306 | /* |
| 307 | * Per block device queue structure |
| 308 | */ |
| 309 | struct cfq_data { |
| 310 | struct request_queue *queue; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 311 | /* Root service tree for cfq_groups */ |
| 312 | struct cfq_rb_root grp_service_tree; |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 313 | struct cfq_group *root_group; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 314 | |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 315 | /* |
| 316 | * The priority currently being served |
| 317 | */ |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 318 | enum wl_class_t serving_wl_class; |
| 319 | enum wl_type_t serving_wl_type; |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 320 | unsigned long workload_expires; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 321 | struct cfq_group *serving_group; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 322 | |
| 323 | /* |
| 324 | * Each priority tree is sorted by next_request position. These |
| 325 | * trees are used when determining if two or more queues are |
| 326 | * interleaving requests (see cfq_close_cooperator). |
| 327 | */ |
| 328 | struct rb_root prio_trees[CFQ_PRIO_LISTS]; |
| 329 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 330 | unsigned int busy_queues; |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 331 | unsigned int busy_sync_queues; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 332 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 333 | int rq_in_driver; |
| 334 | int rq_in_flight[2]; |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 335 | |
| 336 | /* |
| 337 | * queue-depth detection |
| 338 | */ |
| 339 | int rq_queued; |
Jens Axboe | 25776e3 | 2006-06-01 10:12:26 +0200 | [diff] [blame] | 340 | int hw_tag; |
Corrado Zoccolo | e459dd0 | 2009-11-26 10:02:57 +0100 | [diff] [blame] | 341 | /* |
| 342 | * hw_tag can be |
| 343 | * -1 => indeterminate, (cfq will behave as if NCQ is present, to allow better detection) |
| 344 | * 1 => NCQ is present (hw_tag_est_depth is the estimated max depth) |
| 345 | * 0 => no NCQ |
| 346 | */ |
| 347 | int hw_tag_est_depth; |
| 348 | unsigned int hw_tag_samples; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 349 | |
| 350 | /* |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 351 | * idle window management |
| 352 | */ |
| 353 | struct timer_list idle_slice_timer; |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 354 | struct work_struct unplug_work; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 355 | |
| 356 | struct cfq_queue *active_queue; |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 357 | struct cfq_io_cq *active_cic; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 358 | |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 359 | /* |
| 360 | * async queue for each priority case |
| 361 | */ |
| 362 | struct cfq_queue *async_cfqq[2][IOPRIO_BE_NR]; |
| 363 | struct cfq_queue *async_idle_cfqq; |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 364 | |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 365 | sector_t last_position; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /* |
| 368 | * tunables, see top of file |
| 369 | */ |
| 370 | unsigned int cfq_quantum; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 371 | unsigned int cfq_fifo_expire[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | unsigned int cfq_back_penalty; |
| 373 | unsigned int cfq_back_max; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 374 | unsigned int cfq_slice[2]; |
| 375 | unsigned int cfq_slice_async_rq; |
| 376 | unsigned int cfq_slice_idle; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 377 | unsigned int cfq_group_idle; |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 378 | unsigned int cfq_latency; |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 379 | unsigned int cfq_target_latency; |
Al Viro | d9ff418 | 2006-03-18 13:51:22 -0500 | [diff] [blame] | 380 | |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 381 | /* |
| 382 | * Fallback dummy cfqq for extreme OOM conditions |
| 383 | */ |
| 384 | struct cfq_queue oom_cfqq; |
Vivek Goyal | 365722b | 2009-10-03 15:21:27 +0200 | [diff] [blame] | 385 | |
Corrado Zoccolo | 573412b | 2009-12-06 11:48:52 +0100 | [diff] [blame] | 386 | unsigned long last_delayed_sync; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | }; |
| 388 | |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 389 | static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd); |
| 390 | |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 391 | static struct cfq_rb_root *st_for(struct cfq_group *cfqg, |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 392 | enum wl_class_t class, |
Vivek Goyal | 65b32a5 | 2009-12-16 17:52:59 -0500 | [diff] [blame] | 393 | enum wl_type_t type) |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 394 | { |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 395 | if (!cfqg) |
| 396 | return NULL; |
| 397 | |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 398 | if (class == IDLE_WORKLOAD) |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 399 | return &cfqg->service_tree_idle; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 400 | |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 401 | return &cfqg->service_trees[class][type]; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 402 | } |
| 403 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 404 | enum cfqq_state_flags { |
Jens Axboe | b0b8d749 | 2007-01-19 11:35:30 +1100 | [diff] [blame] | 405 | CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ |
| 406 | CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ |
Jens Axboe | b029195 | 2009-04-07 11:38:31 +0200 | [diff] [blame] | 407 | CFQ_CFQQ_FLAG_must_dispatch, /* must be allowed a dispatch */ |
Jens Axboe | b0b8d749 | 2007-01-19 11:35:30 +1100 | [diff] [blame] | 408 | CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ |
Jens Axboe | b0b8d749 | 2007-01-19 11:35:30 +1100 | [diff] [blame] | 409 | CFQ_CFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ |
| 410 | CFQ_CFQQ_FLAG_idle_window, /* slice idling enabled */ |
| 411 | CFQ_CFQQ_FLAG_prio_changed, /* task priority has changed */ |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 412 | CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 413 | CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
Jeff Moyer | b3b6d04 | 2009-10-23 17:14:51 -0400 | [diff] [blame] | 414 | CFQ_CFQQ_FLAG_coop, /* cfqq is shared */ |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 415 | CFQ_CFQQ_FLAG_split_coop, /* shared cfqq will be splitted */ |
Corrado Zoccolo | 76280af | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 416 | CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */ |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 417 | CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */ |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 418 | }; |
| 419 | |
| 420 | #define CFQ_CFQQ_FNS(name) \ |
| 421 | static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ |
| 422 | { \ |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 423 | (cfqq)->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 424 | } \ |
| 425 | static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ |
| 426 | { \ |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 427 | (cfqq)->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 428 | } \ |
| 429 | static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ |
| 430 | { \ |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 431 | return ((cfqq)->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | CFQ_CFQQ_FNS(on_rr); |
| 435 | CFQ_CFQQ_FNS(wait_request); |
Jens Axboe | b029195 | 2009-04-07 11:38:31 +0200 | [diff] [blame] | 436 | CFQ_CFQQ_FNS(must_dispatch); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 437 | CFQ_CFQQ_FNS(must_alloc_slice); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 438 | CFQ_CFQQ_FNS(fifo_expire); |
| 439 | CFQ_CFQQ_FNS(idle_window); |
| 440 | CFQ_CFQQ_FNS(prio_changed); |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 441 | CFQ_CFQQ_FNS(slice_new); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 442 | CFQ_CFQQ_FNS(sync); |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 443 | CFQ_CFQQ_FNS(coop); |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 444 | CFQ_CFQQ_FNS(split_coop); |
Corrado Zoccolo | 76280af | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 445 | CFQ_CFQQ_FNS(deep); |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 446 | CFQ_CFQQ_FNS(wait_busy); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 447 | #undef CFQ_CFQQ_FNS |
| 448 | |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 449 | static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd) |
| 450 | { |
| 451 | return pd ? container_of(pd, struct cfq_group, pd) : NULL; |
| 452 | } |
| 453 | |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 454 | static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg) |
| 455 | { |
| 456 | return pd_to_blkg(&cfqg->pd); |
| 457 | } |
| 458 | |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 459 | #if defined(CONFIG_CFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 460 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 461 | /* cfqg stats flags */ |
| 462 | enum cfqg_stats_flags { |
| 463 | CFQG_stats_waiting = 0, |
| 464 | CFQG_stats_idling, |
| 465 | CFQG_stats_empty, |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 466 | }; |
| 467 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 468 | #define CFQG_FLAG_FNS(name) \ |
| 469 | static inline void cfqg_stats_mark_##name(struct cfqg_stats *stats) \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 470 | { \ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 471 | stats->flags |= (1 << CFQG_stats_##name); \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 472 | } \ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 473 | static inline void cfqg_stats_clear_##name(struct cfqg_stats *stats) \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 474 | { \ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 475 | stats->flags &= ~(1 << CFQG_stats_##name); \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 476 | } \ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 477 | static inline int cfqg_stats_##name(struct cfqg_stats *stats) \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 478 | { \ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 479 | return (stats->flags & (1 << CFQG_stats_##name)) != 0; \ |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 480 | } \ |
| 481 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 482 | CFQG_FLAG_FNS(waiting) |
| 483 | CFQG_FLAG_FNS(idling) |
| 484 | CFQG_FLAG_FNS(empty) |
| 485 | #undef CFQG_FLAG_FNS |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 486 | |
| 487 | /* This should be called with the queue_lock held. */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 488 | static void cfqg_stats_update_group_wait_time(struct cfqg_stats *stats) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 489 | { |
| 490 | unsigned long long now; |
| 491 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 492 | if (!cfqg_stats_waiting(stats)) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 493 | return; |
| 494 | |
| 495 | now = sched_clock(); |
| 496 | if (time_after64(now, stats->start_group_wait_time)) |
| 497 | blkg_stat_add(&stats->group_wait_time, |
| 498 | now - stats->start_group_wait_time); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 499 | cfqg_stats_clear_waiting(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | /* This should be called with the queue_lock held. */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 503 | static void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, |
| 504 | struct cfq_group *curr_cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 505 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 506 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 507 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 508 | if (cfqg_stats_waiting(stats)) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 509 | return; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 510 | if (cfqg == curr_cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 511 | return; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 512 | stats->start_group_wait_time = sched_clock(); |
| 513 | cfqg_stats_mark_waiting(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | /* This should be called with the queue_lock held. */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 517 | static void cfqg_stats_end_empty_time(struct cfqg_stats *stats) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 518 | { |
| 519 | unsigned long long now; |
| 520 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 521 | if (!cfqg_stats_empty(stats)) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 522 | return; |
| 523 | |
| 524 | now = sched_clock(); |
| 525 | if (time_after64(now, stats->start_empty_time)) |
| 526 | blkg_stat_add(&stats->empty_time, |
| 527 | now - stats->start_empty_time); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 528 | cfqg_stats_clear_empty(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 531 | static void cfqg_stats_update_dequeue(struct cfq_group *cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 532 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 533 | blkg_stat_add(&cfqg->stats.dequeue, 1); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 534 | } |
| 535 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 536 | static void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 537 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 538 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 539 | |
Tejun Heo | 4d5e80a | 2013-01-09 08:05:12 -0800 | [diff] [blame] | 540 | if (blkg_rwstat_total(&stats->queued)) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 541 | return; |
| 542 | |
| 543 | /* |
| 544 | * group is already marked empty. This can happen if cfqq got new |
| 545 | * request in parent group and moved to this group while being added |
| 546 | * to service tree. Just ignore the event and move on. |
| 547 | */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 548 | if (cfqg_stats_empty(stats)) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 549 | return; |
| 550 | |
| 551 | stats->start_empty_time = sched_clock(); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 552 | cfqg_stats_mark_empty(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 553 | } |
| 554 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 555 | static void cfqg_stats_update_idle_time(struct cfq_group *cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 556 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 557 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 558 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 559 | if (cfqg_stats_idling(stats)) { |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 560 | unsigned long long now = sched_clock(); |
| 561 | |
| 562 | if (time_after64(now, stats->start_idle_time)) |
| 563 | blkg_stat_add(&stats->idle_time, |
| 564 | now - stats->start_idle_time); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 565 | cfqg_stats_clear_idling(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 566 | } |
| 567 | } |
| 568 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 569 | static void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 570 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 571 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 572 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 573 | BUG_ON(cfqg_stats_idling(stats)); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 574 | |
| 575 | stats->start_idle_time = sched_clock(); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 576 | cfqg_stats_mark_idling(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 577 | } |
| 578 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 579 | static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 580 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 581 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 582 | |
| 583 | blkg_stat_add(&stats->avg_queue_size_sum, |
Tejun Heo | 4d5e80a | 2013-01-09 08:05:12 -0800 | [diff] [blame] | 584 | blkg_rwstat_total(&stats->queued)); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 585 | blkg_stat_add(&stats->avg_queue_size_samples, 1); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 586 | cfqg_stats_update_group_wait_time(stats); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | #else /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ |
| 590 | |
Tejun Heo | f48ec1d | 2012-04-13 13:11:25 -0700 | [diff] [blame] | 591 | static inline void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) { } |
| 592 | static inline void cfqg_stats_end_empty_time(struct cfqg_stats *stats) { } |
| 593 | static inline void cfqg_stats_update_dequeue(struct cfq_group *cfqg) { } |
| 594 | static inline void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) { } |
| 595 | static inline void cfqg_stats_update_idle_time(struct cfq_group *cfqg) { } |
| 596 | static inline void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) { } |
| 597 | static inline void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { } |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 598 | |
| 599 | #endif /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ |
| 600 | |
| 601 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 602 | |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 603 | static struct blkcg_policy blkcg_policy_cfq; |
| 604 | |
| 605 | static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg) |
| 606 | { |
| 607 | return pd_to_cfqg(blkg_to_pd(blkg, &blkcg_policy_cfq)); |
| 608 | } |
| 609 | |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 610 | static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 611 | { |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 612 | struct blkcg_gq *pblkg = cfqg_to_blkg(cfqg)->parent; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 613 | |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 614 | return pblkg ? blkg_to_cfqg(pblkg) : NULL; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 615 | } |
| 616 | |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 617 | static inline void cfqg_get(struct cfq_group *cfqg) |
| 618 | { |
| 619 | return blkg_get(cfqg_to_blkg(cfqg)); |
| 620 | } |
| 621 | |
| 622 | static inline void cfqg_put(struct cfq_group *cfqg) |
| 623 | { |
| 624 | return blkg_put(cfqg_to_blkg(cfqg)); |
| 625 | } |
| 626 | |
Tejun Heo | 54e7ed1 | 2012-04-16 13:57:23 -0700 | [diff] [blame] | 627 | #define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \ |
| 628 | char __pbuf[128]; \ |
| 629 | \ |
| 630 | blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf)); \ |
Vivek Goyal | b226e5c | 2012-10-03 16:57:01 -0400 | [diff] [blame] | 631 | blk_add_trace_msg((cfqd)->queue, "cfq%d%c%c %s " fmt, (cfqq)->pid, \ |
| 632 | cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ |
| 633 | cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\ |
Tejun Heo | 54e7ed1 | 2012-04-16 13:57:23 -0700 | [diff] [blame] | 634 | __pbuf, ##args); \ |
| 635 | } while (0) |
Vivek Goyal | 2868ef7 | 2009-12-03 12:59:48 -0500 | [diff] [blame] | 636 | |
Tejun Heo | 54e7ed1 | 2012-04-16 13:57:23 -0700 | [diff] [blame] | 637 | #define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \ |
| 638 | char __pbuf[128]; \ |
| 639 | \ |
| 640 | blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf)); \ |
| 641 | blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args); \ |
| 642 | } while (0) |
Vivek Goyal | 2868ef7 | 2009-12-03 12:59:48 -0500 | [diff] [blame] | 643 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 644 | static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
| 645 | struct cfq_group *curr_cfqg, int rw) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 646 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 647 | blkg_rwstat_add(&cfqg->stats.queued, rw, 1); |
| 648 | cfqg_stats_end_empty_time(&cfqg->stats); |
| 649 | cfqg_stats_set_start_group_wait_time(cfqg, curr_cfqg); |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 650 | } |
| 651 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 652 | static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
| 653 | unsigned long time, unsigned long unaccounted_time) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 654 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 655 | blkg_stat_add(&cfqg->stats.time, time); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 656 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 657 | blkg_stat_add(&cfqg->stats.unaccounted_time, unaccounted_time); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 658 | #endif |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 661 | static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 662 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 663 | blkg_rwstat_add(&cfqg->stats.queued, rw, -1); |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 664 | } |
| 665 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 666 | static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 667 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 668 | blkg_rwstat_add(&cfqg->stats.merged, rw, 1); |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 671 | static inline void cfqg_stats_update_dispatch(struct cfq_group *cfqg, |
| 672 | uint64_t bytes, int rw) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 673 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 674 | blkg_stat_add(&cfqg->stats.sectors, bytes >> 9); |
| 675 | blkg_rwstat_add(&cfqg->stats.serviced, rw, 1); |
| 676 | blkg_rwstat_add(&cfqg->stats.service_bytes, rw, bytes); |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 679 | static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
| 680 | uint64_t start_time, uint64_t io_start_time, int rw) |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 681 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 682 | struct cfqg_stats *stats = &cfqg->stats; |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 683 | unsigned long long now = sched_clock(); |
Tejun Heo | 629ed0b | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 684 | |
| 685 | if (time_after64(now, io_start_time)) |
| 686 | blkg_rwstat_add(&stats->service_time, rw, now - io_start_time); |
| 687 | if (time_after64(io_start_time, start_time)) |
| 688 | blkg_rwstat_add(&stats->wait_time, rw, |
| 689 | io_start_time - start_time); |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Tejun Heo | 689665a | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 692 | /* @stats = 0 */ |
| 693 | static void cfqg_stats_reset(struct cfqg_stats *stats) |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 694 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 695 | /* queued stats shouldn't be cleared */ |
| 696 | blkg_rwstat_reset(&stats->service_bytes); |
| 697 | blkg_rwstat_reset(&stats->serviced); |
| 698 | blkg_rwstat_reset(&stats->merged); |
| 699 | blkg_rwstat_reset(&stats->service_time); |
| 700 | blkg_rwstat_reset(&stats->wait_time); |
| 701 | blkg_stat_reset(&stats->time); |
| 702 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 703 | blkg_stat_reset(&stats->unaccounted_time); |
| 704 | blkg_stat_reset(&stats->avg_queue_size_sum); |
| 705 | blkg_stat_reset(&stats->avg_queue_size_samples); |
| 706 | blkg_stat_reset(&stats->dequeue); |
| 707 | blkg_stat_reset(&stats->group_wait_time); |
| 708 | blkg_stat_reset(&stats->idle_time); |
| 709 | blkg_stat_reset(&stats->empty_time); |
| 710 | #endif |
| 711 | } |
| 712 | |
Tejun Heo | 0b39920 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 713 | /* @to += @from */ |
| 714 | static void cfqg_stats_merge(struct cfqg_stats *to, struct cfqg_stats *from) |
| 715 | { |
| 716 | /* queued stats shouldn't be cleared */ |
| 717 | blkg_rwstat_merge(&to->service_bytes, &from->service_bytes); |
| 718 | blkg_rwstat_merge(&to->serviced, &from->serviced); |
| 719 | blkg_rwstat_merge(&to->merged, &from->merged); |
| 720 | blkg_rwstat_merge(&to->service_time, &from->service_time); |
| 721 | blkg_rwstat_merge(&to->wait_time, &from->wait_time); |
| 722 | blkg_stat_merge(&from->time, &from->time); |
| 723 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 724 | blkg_stat_merge(&to->unaccounted_time, &from->unaccounted_time); |
| 725 | blkg_stat_merge(&to->avg_queue_size_sum, &from->avg_queue_size_sum); |
| 726 | blkg_stat_merge(&to->avg_queue_size_samples, &from->avg_queue_size_samples); |
| 727 | blkg_stat_merge(&to->dequeue, &from->dequeue); |
| 728 | blkg_stat_merge(&to->group_wait_time, &from->group_wait_time); |
| 729 | blkg_stat_merge(&to->idle_time, &from->idle_time); |
| 730 | blkg_stat_merge(&to->empty_time, &from->empty_time); |
| 731 | #endif |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Transfer @cfqg's stats to its parent's dead_stats so that the ancestors' |
| 736 | * recursive stats can still account for the amount used by this cfqg after |
| 737 | * it's gone. |
| 738 | */ |
| 739 | static void cfqg_stats_xfer_dead(struct cfq_group *cfqg) |
| 740 | { |
| 741 | struct cfq_group *parent = cfqg_parent(cfqg); |
| 742 | |
| 743 | lockdep_assert_held(cfqg_to_blkg(cfqg)->q->queue_lock); |
| 744 | |
| 745 | if (unlikely(!parent)) |
| 746 | return; |
| 747 | |
| 748 | cfqg_stats_merge(&parent->dead_stats, &cfqg->stats); |
| 749 | cfqg_stats_merge(&parent->dead_stats, &cfqg->dead_stats); |
| 750 | cfqg_stats_reset(&cfqg->stats); |
| 751 | cfqg_stats_reset(&cfqg->dead_stats); |
| 752 | } |
| 753 | |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 754 | #else /* CONFIG_CFQ_GROUP_IOSCHED */ |
| 755 | |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 756 | static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) { return NULL; } |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 757 | static inline void cfqg_get(struct cfq_group *cfqg) { } |
| 758 | static inline void cfqg_put(struct cfq_group *cfqg) { } |
| 759 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 760 | #define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ |
Vivek Goyal | b226e5c | 2012-10-03 16:57:01 -0400 | [diff] [blame] | 761 | blk_add_trace_msg((cfqd)->queue, "cfq%d%c%c " fmt, (cfqq)->pid, \ |
| 762 | cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ |
| 763 | cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\ |
| 764 | ##args) |
Kyungmin Park | 4495a7d | 2011-05-31 10:04:09 +0200 | [diff] [blame] | 765 | #define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0) |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 766 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 767 | static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
| 768 | struct cfq_group *curr_cfqg, int rw) { } |
| 769 | static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
| 770 | unsigned long time, unsigned long unaccounted_time) { } |
| 771 | static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw) { } |
| 772 | static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw) { } |
| 773 | static inline void cfqg_stats_update_dispatch(struct cfq_group *cfqg, |
| 774 | uint64_t bytes, int rw) { } |
| 775 | static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
| 776 | uint64_t start_time, uint64_t io_start_time, int rw) { } |
Tejun Heo | 2ce4d50 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 777 | |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 778 | #endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
| 779 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 780 | #define cfq_log(cfqd, fmt, args...) \ |
| 781 | blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) |
| 782 | |
Vivek Goyal | 615f025 | 2009-12-03 12:59:39 -0500 | [diff] [blame] | 783 | /* Traverses through cfq group service trees */ |
| 784 | #define for_each_cfqg_st(cfqg, i, j, st) \ |
| 785 | for (i = 0; i <= IDLE_WORKLOAD; i++) \ |
| 786 | for (j = 0, st = i < IDLE_WORKLOAD ? &cfqg->service_trees[i][j]\ |
| 787 | : &cfqg->service_tree_idle; \ |
| 788 | (i < IDLE_WORKLOAD && j <= SYNC_WORKLOAD) || \ |
| 789 | (i == IDLE_WORKLOAD && j == 0); \ |
| 790 | j++, st = i < IDLE_WORKLOAD ? \ |
| 791 | &cfqg->service_trees[i][j]: NULL) \ |
| 792 | |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 793 | static inline bool cfq_io_thinktime_big(struct cfq_data *cfqd, |
| 794 | struct cfq_ttime *ttime, bool group_idle) |
| 795 | { |
| 796 | unsigned long slice; |
| 797 | if (!sample_valid(ttime->ttime_samples)) |
| 798 | return false; |
| 799 | if (group_idle) |
| 800 | slice = cfqd->cfq_group_idle; |
| 801 | else |
| 802 | slice = cfqd->cfq_slice_idle; |
| 803 | return ttime->ttime_mean > slice; |
| 804 | } |
Vivek Goyal | 615f025 | 2009-12-03 12:59:39 -0500 | [diff] [blame] | 805 | |
Vivek Goyal | 02b3508 | 2010-08-23 12:23:53 +0200 | [diff] [blame] | 806 | static inline bool iops_mode(struct cfq_data *cfqd) |
| 807 | { |
| 808 | /* |
| 809 | * If we are not idling on queues and it is a NCQ drive, parallel |
| 810 | * execution of requests is on and measuring time is not possible |
| 811 | * in most of the cases until and unless we drive shallower queue |
| 812 | * depths and that becomes a performance bottleneck. In such cases |
| 813 | * switch to start providing fairness in terms of number of IOs. |
| 814 | */ |
| 815 | if (!cfqd->cfq_slice_idle && cfqd->hw_tag) |
| 816 | return true; |
| 817 | else |
| 818 | return false; |
| 819 | } |
| 820 | |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 821 | static inline enum wl_class_t cfqq_class(struct cfq_queue *cfqq) |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 822 | { |
| 823 | if (cfq_class_idle(cfqq)) |
| 824 | return IDLE_WORKLOAD; |
| 825 | if (cfq_class_rt(cfqq)) |
| 826 | return RT_WORKLOAD; |
| 827 | return BE_WORKLOAD; |
| 828 | } |
| 829 | |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 830 | |
| 831 | static enum wl_type_t cfqq_type(struct cfq_queue *cfqq) |
| 832 | { |
| 833 | if (!cfq_cfqq_sync(cfqq)) |
| 834 | return ASYNC_WORKLOAD; |
| 835 | if (!cfq_cfqq_idle_window(cfqq)) |
| 836 | return SYNC_NOIDLE_WORKLOAD; |
| 837 | return SYNC_WORKLOAD; |
| 838 | } |
| 839 | |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 840 | static inline int cfq_group_busy_queues_wl(enum wl_class_t wl_class, |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 841 | struct cfq_data *cfqd, |
| 842 | struct cfq_group *cfqg) |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 843 | { |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 844 | if (wl_class == IDLE_WORKLOAD) |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 845 | return cfqg->service_tree_idle.count; |
| 846 | |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 847 | return cfqg->service_trees[wl_class][ASYNC_WORKLOAD].count + |
| 848 | cfqg->service_trees[wl_class][SYNC_NOIDLE_WORKLOAD].count + |
| 849 | cfqg->service_trees[wl_class][SYNC_WORKLOAD].count; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 850 | } |
| 851 | |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 852 | static inline int cfqg_busy_async_queues(struct cfq_data *cfqd, |
| 853 | struct cfq_group *cfqg) |
| 854 | { |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 855 | return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count + |
| 856 | cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count; |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 857 | } |
| 858 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 859 | static void cfq_dispatch_insert(struct request_queue *, struct request *); |
Tejun Heo | 4f85cb9 | 2012-03-05 13:15:28 -0800 | [diff] [blame] | 860 | static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync, |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 861 | struct cfq_io_cq *cic, struct bio *bio, |
Tejun Heo | 4f85cb9 | 2012-03-05 13:15:28 -0800 | [diff] [blame] | 862 | gfp_t gfp_mask); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 863 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 864 | static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq) |
| 865 | { |
| 866 | /* cic->icq is the first member, %NULL will convert to %NULL */ |
| 867 | return container_of(icq, struct cfq_io_cq, icq); |
| 868 | } |
| 869 | |
Tejun Heo | 47fdd4c | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 870 | static inline struct cfq_io_cq *cfq_cic_lookup(struct cfq_data *cfqd, |
| 871 | struct io_context *ioc) |
| 872 | { |
| 873 | if (ioc) |
| 874 | return icq_to_cic(ioc_lookup_icq(ioc, cfqd->queue)); |
| 875 | return NULL; |
| 876 | } |
| 877 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 878 | static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_cq *cic, bool is_sync) |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 879 | { |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 880 | return cic->cfqq[is_sync]; |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 881 | } |
| 882 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 883 | static inline void cic_set_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq, |
| 884 | bool is_sync) |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 885 | { |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 886 | cic->cfqq[is_sync] = cfqq; |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 887 | } |
| 888 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 889 | static inline struct cfq_data *cic_to_cfqd(struct cfq_io_cq *cic) |
Konstantin Khlebnikov | bca4b91 | 2010-05-20 23:21:34 +0400 | [diff] [blame] | 890 | { |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 891 | return cic->icq.q->elevator->elevator_data; |
Konstantin Khlebnikov | bca4b91 | 2010-05-20 23:21:34 +0400 | [diff] [blame] | 892 | } |
| 893 | |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 894 | /* |
| 895 | * We regard a request as SYNC, if it's either a read or has the SYNC bit |
| 896 | * set (in which case it could also be direct WRITE). |
| 897 | */ |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 898 | static inline bool cfq_bio_sync(struct bio *bio) |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 899 | { |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 900 | return bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 901 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | /* |
Andrew Morton | 99f95e5 | 2005-06-27 20:14:05 -0700 | [diff] [blame] | 904 | * scheduler run of queue, if there are requests pending and no one in the |
| 905 | * driver that will restart queueing |
| 906 | */ |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 907 | static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) |
Andrew Morton | 99f95e5 | 2005-06-27 20:14:05 -0700 | [diff] [blame] | 908 | { |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 909 | if (cfqd->busy_queues) { |
| 910 | cfq_log(cfqd, "schedule dispatch"); |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 911 | kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work); |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 912 | } |
Andrew Morton | 99f95e5 | 2005-06-27 20:14:05 -0700 | [diff] [blame] | 913 | } |
| 914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | /* |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 916 | * Scale schedule slice based on io priority. Use the sync time slice only |
| 917 | * if a queue is marked sync and has sync io queued. A sync queue with async |
| 918 | * io only, should not get full sync slice length. |
| 919 | */ |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 920 | static inline int cfq_prio_slice(struct cfq_data *cfqd, bool sync, |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 921 | unsigned short prio) |
| 922 | { |
| 923 | const int base_slice = cfqd->cfq_slice[sync]; |
| 924 | |
| 925 | WARN_ON(prio >= IOPRIO_BE_NR); |
| 926 | |
| 927 | return base_slice + (base_slice/CFQ_SLICE_SCALE * (4 - prio)); |
| 928 | } |
| 929 | |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 930 | static inline int |
| 931 | cfq_prio_to_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 932 | { |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 933 | return cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio); |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 934 | } |
| 935 | |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 936 | /** |
| 937 | * cfqg_scale_charge - scale disk time charge according to cfqg weight |
| 938 | * @charge: disk time being charged |
| 939 | * @vfraction: vfraction of the cfqg, fixed point w/ CFQ_SERVICE_SHIFT |
| 940 | * |
| 941 | * Scale @charge according to @vfraction, which is in range (0, 1]. The |
| 942 | * scaling is inversely proportional. |
| 943 | * |
| 944 | * scaled = charge / vfraction |
| 945 | * |
| 946 | * The result is also in fixed point w/ CFQ_SERVICE_SHIFT. |
| 947 | */ |
| 948 | static inline u64 cfqg_scale_charge(unsigned long charge, |
| 949 | unsigned int vfraction) |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 950 | { |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 951 | u64 c = charge << CFQ_SERVICE_SHIFT; /* make it fixed point */ |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 952 | |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 953 | /* charge / vfraction */ |
| 954 | c <<= CFQ_SERVICE_SHIFT; |
| 955 | do_div(c, vfraction); |
| 956 | return c; |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | static inline u64 max_vdisktime(u64 min_vdisktime, u64 vdisktime) |
| 960 | { |
| 961 | s64 delta = (s64)(vdisktime - min_vdisktime); |
| 962 | if (delta > 0) |
| 963 | min_vdisktime = vdisktime; |
| 964 | |
| 965 | return min_vdisktime; |
| 966 | } |
| 967 | |
| 968 | static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime) |
| 969 | { |
| 970 | s64 delta = (s64)(vdisktime - min_vdisktime); |
| 971 | if (delta < 0) |
| 972 | min_vdisktime = vdisktime; |
| 973 | |
| 974 | return min_vdisktime; |
| 975 | } |
| 976 | |
| 977 | static void update_min_vdisktime(struct cfq_rb_root *st) |
| 978 | { |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 979 | struct cfq_group *cfqg; |
| 980 | |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 981 | if (st->left) { |
| 982 | cfqg = rb_entry_cfqg(st->left); |
Gui Jianfeng | a603271 | 2011-03-07 09:28:09 +0100 | [diff] [blame] | 983 | st->min_vdisktime = max_vdisktime(st->min_vdisktime, |
| 984 | cfqg->vdisktime); |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 985 | } |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 986 | } |
| 987 | |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 988 | /* |
| 989 | * get averaged number of queues of RT/BE priority. |
| 990 | * average is updated, with a formula that gives more weight to higher numbers, |
| 991 | * to quickly follows sudden increases and decrease slowly |
| 992 | */ |
| 993 | |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 994 | static inline unsigned cfq_group_get_avg_queues(struct cfq_data *cfqd, |
| 995 | struct cfq_group *cfqg, bool rt) |
Jens Axboe | 5869619c | 2009-10-28 09:27:07 +0100 | [diff] [blame] | 996 | { |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 997 | unsigned min_q, max_q; |
| 998 | unsigned mult = cfq_hist_divisor - 1; |
| 999 | unsigned round = cfq_hist_divisor / 2; |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1000 | unsigned busy = cfq_group_busy_queues_wl(rt, cfqd, cfqg); |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1001 | |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1002 | min_q = min(cfqg->busy_queues_avg[rt], busy); |
| 1003 | max_q = max(cfqg->busy_queues_avg[rt], busy); |
| 1004 | cfqg->busy_queues_avg[rt] = (mult * max_q + min_q + round) / |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1005 | cfq_hist_divisor; |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1006 | return cfqg->busy_queues_avg[rt]; |
| 1007 | } |
| 1008 | |
| 1009 | static inline unsigned |
| 1010 | cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) |
| 1011 | { |
Tejun Heo | 41cad6a | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1012 | return cfqd->cfq_target_latency * cfqg->vfraction >> CFQ_SERVICE_SHIFT; |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1013 | } |
| 1014 | |
Shaohua Li | c553f8e | 2011-01-14 08:41:03 +0100 | [diff] [blame] | 1015 | static inline unsigned |
Vivek Goyal | ba5bd52 | 2011-01-19 08:25:02 -0700 | [diff] [blame] | 1016 | cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1017 | { |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1018 | unsigned slice = cfq_prio_to_slice(cfqd, cfqq); |
| 1019 | if (cfqd->cfq_latency) { |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1020 | /* |
| 1021 | * interested queues (we consider only the ones with the same |
| 1022 | * priority class in the cfq group) |
| 1023 | */ |
| 1024 | unsigned iq = cfq_group_get_avg_queues(cfqd, cfqq->cfqg, |
| 1025 | cfq_class_rt(cfqq)); |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1026 | unsigned sync_slice = cfqd->cfq_slice[1]; |
| 1027 | unsigned expect_latency = sync_slice * iq; |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1028 | unsigned group_slice = cfq_group_slice(cfqd, cfqq->cfqg); |
| 1029 | |
| 1030 | if (expect_latency > group_slice) { |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1031 | unsigned base_low_slice = 2 * cfqd->cfq_slice_idle; |
| 1032 | /* scale low_slice according to IO priority |
| 1033 | * and sync vs async */ |
| 1034 | unsigned low_slice = |
| 1035 | min(slice, base_low_slice * slice / sync_slice); |
| 1036 | /* the adapted slice value is scaled to fit all iqs |
| 1037 | * into the target latency */ |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 1038 | slice = max(slice * group_slice / expect_latency, |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1039 | low_slice); |
| 1040 | } |
| 1041 | } |
Shaohua Li | c553f8e | 2011-01-14 08:41:03 +0100 | [diff] [blame] | 1042 | return slice; |
| 1043 | } |
| 1044 | |
| 1045 | static inline void |
| 1046 | cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 1047 | { |
Vivek Goyal | ba5bd52 | 2011-01-19 08:25:02 -0700 | [diff] [blame] | 1048 | unsigned slice = cfq_scaled_cfqq_slice(cfqd, cfqq); |
Shaohua Li | c553f8e | 2011-01-14 08:41:03 +0100 | [diff] [blame] | 1049 | |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1050 | cfqq->slice_start = jiffies; |
Corrado Zoccolo | 5db5d64 | 2009-10-26 22:44:04 +0100 | [diff] [blame] | 1051 | cfqq->slice_end = jiffies + slice; |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 1052 | cfqq->allocated_slice = slice; |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 1053 | cfq_log_cfqq(cfqd, cfqq, "set_slice=%lu", cfqq->slice_end - jiffies); |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * We need to wrap this check in cfq_cfqq_slice_new(), since ->slice_end |
| 1058 | * isn't valid until the first request from the dispatch is activated |
| 1059 | * and the slice time set. |
| 1060 | */ |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 1061 | static inline bool cfq_slice_used(struct cfq_queue *cfqq) |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1062 | { |
| 1063 | if (cfq_cfqq_slice_new(cfqq)) |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 1064 | return false; |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1065 | if (time_before(jiffies, cfqq->slice_end)) |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 1066 | return false; |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1067 | |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 1068 | return true; |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 1069 | } |
| 1070 | |
| 1071 | /* |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1072 | * Lifted from AS - choose which of rq1 and rq2 that is best served now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | * We choose the request that is closest to the head right now. Distance |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1074 | * behind the head is penalized and only allowed to a certain extent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | */ |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1076 | static struct request * |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 1077 | cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, sector_t last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | { |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 1079 | sector_t s1, s2, d1 = 0, d2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | unsigned long back_max; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1081 | #define CFQ_RQ1_WRAP 0x01 /* request 1 wraps */ |
| 1082 | #define CFQ_RQ2_WRAP 0x02 /* request 2 wraps */ |
| 1083 | unsigned wrap = 0; /* bit mask: requests behind the disk head? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1085 | if (rq1 == NULL || rq1 == rq2) |
| 1086 | return rq2; |
| 1087 | if (rq2 == NULL) |
| 1088 | return rq1; |
Jens Axboe | 9c2c38a | 2005-08-24 14:57:54 +0200 | [diff] [blame] | 1089 | |
Namhyung Kim | 229836b | 2011-05-24 10:23:21 +0200 | [diff] [blame] | 1090 | if (rq_is_sync(rq1) != rq_is_sync(rq2)) |
| 1091 | return rq_is_sync(rq1) ? rq1 : rq2; |
| 1092 | |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 1093 | if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_PRIO) |
| 1094 | return rq1->cmd_flags & REQ_PRIO ? rq1 : rq2; |
Jens Axboe | b53d1ed | 2011-08-19 08:34:48 +0200 | [diff] [blame] | 1095 | |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 1096 | s1 = blk_rq_pos(rq1); |
| 1097 | s2 = blk_rq_pos(rq2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | /* |
| 1100 | * by definition, 1KiB is 2 sectors |
| 1101 | */ |
| 1102 | back_max = cfqd->cfq_back_max * 2; |
| 1103 | |
| 1104 | /* |
| 1105 | * Strict one way elevator _except_ in the case where we allow |
| 1106 | * short backward seeks which are biased as twice the cost of a |
| 1107 | * similar forward seek. |
| 1108 | */ |
| 1109 | if (s1 >= last) |
| 1110 | d1 = s1 - last; |
| 1111 | else if (s1 + back_max >= last) |
| 1112 | d1 = (last - s1) * cfqd->cfq_back_penalty; |
| 1113 | else |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1114 | wrap |= CFQ_RQ1_WRAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | if (s2 >= last) |
| 1117 | d2 = s2 - last; |
| 1118 | else if (s2 + back_max >= last) |
| 1119 | d2 = (last - s2) * cfqd->cfq_back_penalty; |
| 1120 | else |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1121 | wrap |= CFQ_RQ2_WRAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
| 1123 | /* Found required data */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1125 | /* |
| 1126 | * By doing switch() on the bit mask "wrap" we avoid having to |
| 1127 | * check two variables for all permutations: --> faster! |
| 1128 | */ |
| 1129 | switch (wrap) { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1130 | case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1131 | if (d1 < d2) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1132 | return rq1; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1133 | else if (d2 < d1) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1134 | return rq2; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1135 | else { |
| 1136 | if (s1 >= s2) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1137 | return rq1; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1138 | else |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1139 | return rq2; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | case CFQ_RQ2_WRAP: |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1143 | return rq1; |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1144 | case CFQ_RQ1_WRAP: |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1145 | return rq2; |
| 1146 | case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
Andreas Mohr | e8a9905 | 2006-03-28 08:59:49 +0200 | [diff] [blame] | 1147 | default: |
| 1148 | /* |
| 1149 | * Since both rqs are wrapped, |
| 1150 | * start with the one that's further behind head |
| 1151 | * (--> only *one* back seek required), |
| 1152 | * since back seek takes more time than forward. |
| 1153 | */ |
| 1154 | if (s1 <= s2) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1155 | return rq1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | else |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1157 | return rq2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | } |
| 1159 | } |
| 1160 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 1161 | /* |
| 1162 | * The below is leftmost cache rbtree addon |
| 1163 | */ |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 1164 | static struct cfq_queue *cfq_rb_first(struct cfq_rb_root *root) |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 1165 | { |
Vivek Goyal | 615f025 | 2009-12-03 12:59:39 -0500 | [diff] [blame] | 1166 | /* Service tree is empty */ |
| 1167 | if (!root->count) |
| 1168 | return NULL; |
| 1169 | |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 1170 | if (!root->left) |
| 1171 | root->left = rb_first(&root->rb); |
| 1172 | |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 1173 | if (root->left) |
| 1174 | return rb_entry(root->left, struct cfq_queue, rb_node); |
| 1175 | |
| 1176 | return NULL; |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 1177 | } |
| 1178 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1179 | static struct cfq_group *cfq_rb_first_group(struct cfq_rb_root *root) |
| 1180 | { |
| 1181 | if (!root->left) |
| 1182 | root->left = rb_first(&root->rb); |
| 1183 | |
| 1184 | if (root->left) |
| 1185 | return rb_entry_cfqg(root->left); |
| 1186 | |
| 1187 | return NULL; |
| 1188 | } |
| 1189 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 1190 | static void rb_erase_init(struct rb_node *n, struct rb_root *root) |
| 1191 | { |
| 1192 | rb_erase(n, root); |
| 1193 | RB_CLEAR_NODE(n); |
| 1194 | } |
| 1195 | |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 1196 | static void cfq_rb_erase(struct rb_node *n, struct cfq_rb_root *root) |
| 1197 | { |
| 1198 | if (root->left == n) |
| 1199 | root->left = NULL; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 1200 | rb_erase_init(n, &root->rb); |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 1201 | --root->count; |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 1202 | } |
| 1203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | /* |
| 1205 | * would be nice to take fifo expire time into account as well |
| 1206 | */ |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1207 | static struct request * |
| 1208 | cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
| 1209 | struct request *last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | { |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 1211 | struct rb_node *rbnext = rb_next(&last->rb_node); |
| 1212 | struct rb_node *rbprev = rb_prev(&last->rb_node); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1213 | struct request *next = NULL, *prev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 1215 | BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
| 1217 | if (rbprev) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1218 | prev = rb_entry_rq(rbprev); |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | if (rbnext) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1221 | next = rb_entry_rq(rbnext); |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 1222 | else { |
| 1223 | rbnext = rb_first(&cfqq->sort_list); |
| 1224 | if (rbnext && rbnext != &last->rb_node) |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 1225 | next = rb_entry_rq(rbnext); |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 1226 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 1228 | return cfq_choose_req(cfqd, next, prev, blk_rq_pos(last)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | } |
| 1230 | |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 1231 | static unsigned long cfq_slice_offset(struct cfq_data *cfqd, |
| 1232 | struct cfq_queue *cfqq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | { |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 1234 | /* |
| 1235 | * just an approximation, should be ok. |
| 1236 | */ |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 1237 | return (cfqq->cfqg->nr_cfqq - 1) * (cfq_prio_slice(cfqd, 1, 0) - |
Jens Axboe | 464191c | 2009-11-30 09:38:13 +0100 | [diff] [blame] | 1238 | cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 1239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1241 | static inline s64 |
| 1242 | cfqg_key(struct cfq_rb_root *st, struct cfq_group *cfqg) |
| 1243 | { |
| 1244 | return cfqg->vdisktime - st->min_vdisktime; |
| 1245 | } |
| 1246 | |
| 1247 | static void |
| 1248 | __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) |
| 1249 | { |
| 1250 | struct rb_node **node = &st->rb.rb_node; |
| 1251 | struct rb_node *parent = NULL; |
| 1252 | struct cfq_group *__cfqg; |
| 1253 | s64 key = cfqg_key(st, cfqg); |
| 1254 | int left = 1; |
| 1255 | |
| 1256 | while (*node != NULL) { |
| 1257 | parent = *node; |
| 1258 | __cfqg = rb_entry_cfqg(parent); |
| 1259 | |
| 1260 | if (key < cfqg_key(st, __cfqg)) |
| 1261 | node = &parent->rb_left; |
| 1262 | else { |
| 1263 | node = &parent->rb_right; |
| 1264 | left = 0; |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | if (left) |
| 1269 | st->left = &cfqg->rb_node; |
| 1270 | |
| 1271 | rb_link_node(&cfqg->rb_node, parent, node); |
| 1272 | rb_insert_color(&cfqg->rb_node, &st->rb); |
| 1273 | } |
| 1274 | |
| 1275 | static void |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1276 | cfq_update_group_weight(struct cfq_group *cfqg) |
| 1277 | { |
| 1278 | BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1279 | |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1280 | if (cfqg->new_weight) { |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1281 | cfqg->weight = cfqg->new_weight; |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1282 | cfqg->new_weight = 0; |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1283 | } |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1284 | |
| 1285 | if (cfqg->new_leaf_weight) { |
| 1286 | cfqg->leaf_weight = cfqg->new_leaf_weight; |
| 1287 | cfqg->new_leaf_weight = 0; |
| 1288 | } |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1289 | } |
| 1290 | |
| 1291 | static void |
| 1292 | cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) |
| 1293 | { |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1294 | unsigned int vfr = 1 << CFQ_SERVICE_SHIFT; /* start with 1 */ |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1295 | struct cfq_group *pos = cfqg; |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1296 | struct cfq_group *parent; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1297 | bool propagate; |
| 1298 | |
| 1299 | /* add to the service tree */ |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1300 | BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
| 1301 | |
| 1302 | cfq_update_group_weight(cfqg); |
| 1303 | __cfq_group_service_tree_add(st, cfqg); |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1304 | |
| 1305 | /* |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1306 | * Activate @cfqg and calculate the portion of vfraction @cfqg is |
| 1307 | * entitled to. vfraction is calculated by walking the tree |
| 1308 | * towards the root calculating the fraction it has at each level. |
| 1309 | * The compounded ratio is how much vfraction @cfqg owns. |
| 1310 | * |
| 1311 | * Start with the proportion tasks in this cfqg has against active |
| 1312 | * children cfqgs - its leaf_weight against children_weight. |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1313 | */ |
| 1314 | propagate = !pos->nr_active++; |
| 1315 | pos->children_weight += pos->leaf_weight; |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1316 | vfr = vfr * pos->leaf_weight / pos->children_weight; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1317 | |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1318 | /* |
| 1319 | * Compound ->weight walking up the tree. Both activation and |
| 1320 | * vfraction calculation are done in the same loop. Propagation |
| 1321 | * stops once an already activated node is met. vfraction |
| 1322 | * calculation should always continue to the root. |
| 1323 | */ |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1324 | while ((parent = cfqg_parent(pos))) { |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1325 | if (propagate) { |
| 1326 | propagate = !parent->nr_active++; |
| 1327 | parent->children_weight += pos->weight; |
| 1328 | } |
| 1329 | vfr = vfr * pos->weight / parent->children_weight; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1330 | pos = parent; |
| 1331 | } |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1332 | |
| 1333 | cfqg->vfraction = max_t(unsigned, vfr, 1); |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1334 | } |
| 1335 | |
| 1336 | static void |
| 1337 | cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg) |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1338 | { |
| 1339 | struct cfq_rb_root *st = &cfqd->grp_service_tree; |
| 1340 | struct cfq_group *__cfqg; |
| 1341 | struct rb_node *n; |
| 1342 | |
| 1343 | cfqg->nr_cfqq++; |
Gui Jianfeng | 760701b | 2010-11-30 20:52:47 +0100 | [diff] [blame] | 1344 | if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1345 | return; |
| 1346 | |
| 1347 | /* |
| 1348 | * Currently put the group at the end. Later implement something |
| 1349 | * so that groups get lesser vtime based on their weights, so that |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1350 | * if group does not loose all if it was not continuously backlogged. |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1351 | */ |
| 1352 | n = rb_last(&st->rb); |
| 1353 | if (n) { |
| 1354 | __cfqg = rb_entry_cfqg(n); |
| 1355 | cfqg->vdisktime = __cfqg->vdisktime + CFQ_IDLE_DELAY; |
| 1356 | } else |
| 1357 | cfqg->vdisktime = st->min_vdisktime; |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1358 | cfq_group_service_tree_add(st, cfqg); |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1359 | } |
| 1360 | |
| 1361 | static void |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1362 | cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) |
| 1363 | { |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1364 | struct cfq_group *pos = cfqg; |
| 1365 | bool propagate; |
| 1366 | |
| 1367 | /* |
| 1368 | * Undo activation from cfq_group_service_tree_add(). Deactivate |
| 1369 | * @cfqg and propagate deactivation upwards. |
| 1370 | */ |
| 1371 | propagate = !--pos->nr_active; |
| 1372 | pos->children_weight -= pos->leaf_weight; |
| 1373 | |
| 1374 | while (propagate) { |
Tejun Heo | d02f7aa | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1375 | struct cfq_group *parent = cfqg_parent(pos); |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1376 | |
| 1377 | /* @pos has 0 nr_active at this point */ |
| 1378 | WARN_ON_ONCE(pos->children_weight); |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1379 | pos->vfraction = 0; |
Tejun Heo | 7918ffb | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1380 | |
| 1381 | if (!parent) |
| 1382 | break; |
| 1383 | |
| 1384 | propagate = !--parent->nr_active; |
| 1385 | parent->children_weight -= pos->weight; |
| 1386 | pos = parent; |
| 1387 | } |
| 1388 | |
| 1389 | /* remove from the service tree */ |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1390 | if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
| 1391 | cfq_rb_erase(&cfqg->rb_node, st); |
| 1392 | } |
| 1393 | |
| 1394 | static void |
| 1395 | cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg) |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1396 | { |
| 1397 | struct cfq_rb_root *st = &cfqd->grp_service_tree; |
| 1398 | |
| 1399 | BUG_ON(cfqg->nr_cfqq < 1); |
| 1400 | cfqg->nr_cfqq--; |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 1401 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1402 | /* If there are other cfq queues under this group, don't delete it */ |
| 1403 | if (cfqg->nr_cfqq) |
| 1404 | return; |
| 1405 | |
Vivek Goyal | 2868ef7 | 2009-12-03 12:59:48 -0500 | [diff] [blame] | 1406 | cfq_log_cfqg(cfqd, cfqg, "del_from_rr group"); |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1407 | cfq_group_service_tree_del(st, cfqg); |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 1408 | cfqg->saved_wl_slice = 0; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1409 | cfqg_stats_update_dequeue(cfqg); |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1410 | } |
| 1411 | |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 1412 | static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq, |
| 1413 | unsigned int *unaccounted_time) |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1414 | { |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 1415 | unsigned int slice_used; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1416 | |
| 1417 | /* |
| 1418 | * Queue got expired before even a single request completed or |
| 1419 | * got expired immediately after first request completion. |
| 1420 | */ |
| 1421 | if (!cfqq->slice_start || cfqq->slice_start == jiffies) { |
| 1422 | /* |
| 1423 | * Also charge the seek time incurred to the group, otherwise |
| 1424 | * if there are mutiple queues in the group, each can dispatch |
| 1425 | * a single request on seeky media and cause lots of seek time |
| 1426 | * and group will never know it. |
| 1427 | */ |
| 1428 | slice_used = max_t(unsigned, (jiffies - cfqq->dispatch_start), |
| 1429 | 1); |
| 1430 | } else { |
| 1431 | slice_used = jiffies - cfqq->slice_start; |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 1432 | if (slice_used > cfqq->allocated_slice) { |
| 1433 | *unaccounted_time = slice_used - cfqq->allocated_slice; |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 1434 | slice_used = cfqq->allocated_slice; |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 1435 | } |
| 1436 | if (time_after(cfqq->slice_start, cfqq->dispatch_start)) |
| 1437 | *unaccounted_time += cfqq->slice_start - |
| 1438 | cfqq->dispatch_start; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1439 | } |
| 1440 | |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1441 | return slice_used; |
| 1442 | } |
| 1443 | |
| 1444 | static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 1445 | struct cfq_queue *cfqq) |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1446 | { |
| 1447 | struct cfq_rb_root *st = &cfqd->grp_service_tree; |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 1448 | unsigned int used_sl, charge, unaccounted_sl = 0; |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 1449 | int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg) |
| 1450 | - cfqg->service_tree_idle.count; |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1451 | unsigned int vfr; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1452 | |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 1453 | BUG_ON(nr_sync < 0); |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 1454 | used_sl = charge = cfq_cfqq_slice_usage(cfqq, &unaccounted_sl); |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 1455 | |
Vivek Goyal | 02b3508 | 2010-08-23 12:23:53 +0200 | [diff] [blame] | 1456 | if (iops_mode(cfqd)) |
| 1457 | charge = cfqq->slice_dispatch; |
| 1458 | else if (!cfq_cfqq_sync(cfqq) && !nr_sync) |
| 1459 | charge = cfqq->allocated_slice; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1460 | |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1461 | /* |
| 1462 | * Can't update vdisktime while on service tree and cfqg->vfraction |
| 1463 | * is valid only while on it. Cache vfr, leave the service tree, |
| 1464 | * update vdisktime and go back on. The re-addition to the tree |
| 1465 | * will also update the weights as necessary. |
| 1466 | */ |
| 1467 | vfr = cfqg->vfraction; |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1468 | cfq_group_service_tree_del(st, cfqg); |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1469 | cfqg->vdisktime += cfqg_scale_charge(charge, vfr); |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 1470 | cfq_group_service_tree_add(st, cfqg); |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1471 | |
| 1472 | /* This group is being expired. Save the context */ |
| 1473 | if (time_after(cfqd->workload_expires, jiffies)) { |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 1474 | cfqg->saved_wl_slice = cfqd->workload_expires |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1475 | - jiffies; |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 1476 | cfqg->saved_wl_type = cfqd->serving_wl_type; |
| 1477 | cfqg->saved_wl_class = cfqd->serving_wl_class; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 1478 | } else |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 1479 | cfqg->saved_wl_slice = 0; |
Vivek Goyal | 2868ef7 | 2009-12-03 12:59:48 -0500 | [diff] [blame] | 1480 | |
| 1481 | cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, |
| 1482 | st->min_vdisktime); |
Joe Perches | fd16d26 | 2011-06-13 10:42:49 +0200 | [diff] [blame] | 1483 | cfq_log_cfqq(cfqq->cfqd, cfqq, |
| 1484 | "sl_used=%u disp=%u charge=%u iops=%u sect=%lu", |
| 1485 | used_sl, cfqq->slice_dispatch, charge, |
| 1486 | iops_mode(cfqd), cfqq->nr_sectors); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1487 | cfqg_stats_update_timeslice_used(cfqg, used_sl, unaccounted_sl); |
| 1488 | cfqg_stats_set_start_empty_time(cfqg); |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 1489 | } |
| 1490 | |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 1491 | /** |
| 1492 | * cfq_init_cfqg_base - initialize base part of a cfq_group |
| 1493 | * @cfqg: cfq_group to initialize |
| 1494 | * |
| 1495 | * Initialize the base part which is used whether %CONFIG_CFQ_GROUP_IOSCHED |
| 1496 | * is enabled or not. |
| 1497 | */ |
| 1498 | static void cfq_init_cfqg_base(struct cfq_group *cfqg) |
| 1499 | { |
| 1500 | struct cfq_rb_root *st; |
| 1501 | int i, j; |
| 1502 | |
| 1503 | for_each_cfqg_st(cfqg, i, j, st) |
| 1504 | *st = CFQ_RB_ROOT; |
| 1505 | RB_CLEAR_NODE(&cfqg->rb_node); |
| 1506 | |
| 1507 | cfqg->ttime.last_end_request = jiffies; |
| 1508 | } |
| 1509 | |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1510 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1511 | static void cfq_pd_init(struct blkcg_gq *blkg) |
Vivek Goyal | f469a7b | 2011-05-19 15:38:23 -0400 | [diff] [blame] | 1512 | { |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 1513 | struct cfq_group *cfqg = blkg_to_cfqg(blkg); |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1514 | |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 1515 | cfq_init_cfqg_base(cfqg); |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1516 | cfqg->weight = blkg->blkcg->cfq_weight; |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1517 | cfqg->leaf_weight = blkg->blkcg->cfq_leaf_weight; |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1518 | } |
| 1519 | |
Tejun Heo | 0b39920 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1520 | static void cfq_pd_offline(struct blkcg_gq *blkg) |
| 1521 | { |
| 1522 | /* |
| 1523 | * @blkg is going offline and will be ignored by |
| 1524 | * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so |
| 1525 | * that they don't get lost. If IOs complete after this point, the |
| 1526 | * stats for them will be lost. Oh well... |
| 1527 | */ |
| 1528 | cfqg_stats_xfer_dead(blkg_to_cfqg(blkg)); |
| 1529 | } |
| 1530 | |
Tejun Heo | 4311401 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1531 | /* offset delta from cfqg->stats to cfqg->dead_stats */ |
| 1532 | static const int dead_stats_off_delta = offsetof(struct cfq_group, dead_stats) - |
| 1533 | offsetof(struct cfq_group, stats); |
| 1534 | |
| 1535 | /* to be used by recursive prfill, sums live and dead stats recursively */ |
| 1536 | static u64 cfqg_stat_pd_recursive_sum(struct blkg_policy_data *pd, int off) |
| 1537 | { |
| 1538 | u64 sum = 0; |
| 1539 | |
| 1540 | sum += blkg_stat_recursive_sum(pd, off); |
| 1541 | sum += blkg_stat_recursive_sum(pd, off + dead_stats_off_delta); |
| 1542 | return sum; |
| 1543 | } |
| 1544 | |
| 1545 | /* to be used by recursive prfill, sums live and dead rwstats recursively */ |
| 1546 | static struct blkg_rwstat cfqg_rwstat_pd_recursive_sum(struct blkg_policy_data *pd, |
| 1547 | int off) |
| 1548 | { |
| 1549 | struct blkg_rwstat a, b; |
| 1550 | |
| 1551 | a = blkg_rwstat_recursive_sum(pd, off); |
| 1552 | b = blkg_rwstat_recursive_sum(pd, off + dead_stats_off_delta); |
| 1553 | blkg_rwstat_merge(&a, &b); |
| 1554 | return a; |
| 1555 | } |
| 1556 | |
Tejun Heo | 689665a | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1557 | static void cfq_pd_reset_stats(struct blkcg_gq *blkg) |
| 1558 | { |
| 1559 | struct cfq_group *cfqg = blkg_to_cfqg(blkg); |
| 1560 | |
| 1561 | cfqg_stats_reset(&cfqg->stats); |
Tejun Heo | 0b39920 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1562 | cfqg_stats_reset(&cfqg->dead_stats); |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1563 | } |
| 1564 | |
| 1565 | /* |
Vivek Goyal | 3e59cf9 | 2011-05-19 15:38:21 -0400 | [diff] [blame] | 1566 | * Search for the cfq group current task belongs to. request_queue lock must |
| 1567 | * be held. |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1568 | */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 1569 | static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd, |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1570 | struct blkcg *blkcg) |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1571 | { |
Vivek Goyal | f469a7b | 2011-05-19 15:38:23 -0400 | [diff] [blame] | 1572 | struct request_queue *q = cfqd->queue; |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 1573 | struct cfq_group *cfqg = NULL; |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1574 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1575 | /* avoid lookup for the common case where there's no blkcg */ |
| 1576 | if (blkcg == &blkcg_root) { |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 1577 | cfqg = cfqd->root_group; |
| 1578 | } else { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1579 | struct blkcg_gq *blkg; |
Vivek Goyal | f469a7b | 2011-05-19 15:38:23 -0400 | [diff] [blame] | 1580 | |
Tejun Heo | 3c96cb3 | 2012-04-13 13:11:34 -0700 | [diff] [blame] | 1581 | blkg = blkg_lookup_create(blkcg, q); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 1582 | if (!IS_ERR(blkg)) |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 1583 | cfqg = blkg_to_cfqg(blkg); |
Vivek Goyal | f469a7b | 2011-05-19 15:38:23 -0400 | [diff] [blame] | 1584 | } |
| 1585 | |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1586 | return cfqg; |
| 1587 | } |
| 1588 | |
| 1589 | static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) |
| 1590 | { |
| 1591 | /* Currently, all async queues are mapped to root group */ |
| 1592 | if (!cfq_cfqq_sync(cfqq)) |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 1593 | cfqg = cfqq->cfqd->root_group; |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1594 | |
| 1595 | cfqq->cfqg = cfqg; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1596 | /* cfqq reference on cfqg */ |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 1597 | cfqg_get(cfqg); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1598 | } |
| 1599 | |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1600 | static u64 cfqg_prfill_weight_device(struct seq_file *sf, |
| 1601 | struct blkg_policy_data *pd, int off) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1602 | { |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1603 | struct cfq_group *cfqg = pd_to_cfqg(pd); |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1604 | |
| 1605 | if (!cfqg->dev_weight) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1606 | return 0; |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1607 | return __blkg_prfill_u64(sf, pd, cfqg->dev_weight); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1608 | } |
| 1609 | |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1610 | static int cfqg_print_weight_device(struct cgroup *cgrp, struct cftype *cft, |
| 1611 | struct seq_file *sf) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1612 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1613 | blkcg_print_blkgs(sf, cgroup_to_blkcg(cgrp), |
| 1614 | cfqg_prfill_weight_device, &blkcg_policy_cfq, 0, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1615 | false); |
| 1616 | return 0; |
| 1617 | } |
| 1618 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1619 | static u64 cfqg_prfill_leaf_weight_device(struct seq_file *sf, |
| 1620 | struct blkg_policy_data *pd, int off) |
| 1621 | { |
| 1622 | struct cfq_group *cfqg = pd_to_cfqg(pd); |
| 1623 | |
| 1624 | if (!cfqg->dev_leaf_weight) |
| 1625 | return 0; |
| 1626 | return __blkg_prfill_u64(sf, pd, cfqg->dev_leaf_weight); |
| 1627 | } |
| 1628 | |
| 1629 | static int cfqg_print_leaf_weight_device(struct cgroup *cgrp, |
| 1630 | struct cftype *cft, |
| 1631 | struct seq_file *sf) |
| 1632 | { |
| 1633 | blkcg_print_blkgs(sf, cgroup_to_blkcg(cgrp), |
| 1634 | cfqg_prfill_leaf_weight_device, &blkcg_policy_cfq, 0, |
| 1635 | false); |
| 1636 | return 0; |
| 1637 | } |
| 1638 | |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1639 | static int cfq_print_weight(struct cgroup *cgrp, struct cftype *cft, |
| 1640 | struct seq_file *sf) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1641 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1642 | seq_printf(sf, "%u\n", cgroup_to_blkcg(cgrp)->cfq_weight); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1643 | return 0; |
| 1644 | } |
| 1645 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1646 | static int cfq_print_leaf_weight(struct cgroup *cgrp, struct cftype *cft, |
| 1647 | struct seq_file *sf) |
| 1648 | { |
| 1649 | seq_printf(sf, "%u\n", |
| 1650 | cgroup_to_blkcg(cgrp)->cfq_leaf_weight); |
| 1651 | return 0; |
| 1652 | } |
| 1653 | |
| 1654 | static int __cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft, |
| 1655 | const char *buf, bool is_leaf_weight) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1656 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1657 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1658 | struct blkg_conf_ctx ctx; |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1659 | struct cfq_group *cfqg; |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1660 | int ret; |
| 1661 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1662 | ret = blkg_conf_prep(blkcg, &blkcg_policy_cfq, buf, &ctx); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1663 | if (ret) |
| 1664 | return ret; |
| 1665 | |
| 1666 | ret = -EINVAL; |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1667 | cfqg = blkg_to_cfqg(ctx.blkg); |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 1668 | if (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN && ctx.v <= CFQ_WEIGHT_MAX)) { |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1669 | if (!is_leaf_weight) { |
| 1670 | cfqg->dev_weight = ctx.v; |
| 1671 | cfqg->new_weight = ctx.v ?: blkcg->cfq_weight; |
| 1672 | } else { |
| 1673 | cfqg->dev_leaf_weight = ctx.v; |
| 1674 | cfqg->new_leaf_weight = ctx.v ?: blkcg->cfq_leaf_weight; |
| 1675 | } |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1676 | ret = 0; |
| 1677 | } |
| 1678 | |
| 1679 | blkg_conf_finish(&ctx); |
| 1680 | return ret; |
| 1681 | } |
| 1682 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1683 | static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft, |
| 1684 | const char *buf) |
| 1685 | { |
| 1686 | return __cfqg_set_weight_device(cgrp, cft, buf, false); |
| 1687 | } |
| 1688 | |
| 1689 | static int cfqg_set_leaf_weight_device(struct cgroup *cgrp, struct cftype *cft, |
| 1690 | const char *buf) |
| 1691 | { |
| 1692 | return __cfqg_set_weight_device(cgrp, cft, buf, true); |
| 1693 | } |
| 1694 | |
| 1695 | static int __cfq_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val, |
| 1696 | bool is_leaf_weight) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1697 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1698 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
| 1699 | struct blkcg_gq *blkg; |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1700 | |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1701 | if (val < CFQ_WEIGHT_MIN || val > CFQ_WEIGHT_MAX) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1702 | return -EINVAL; |
| 1703 | |
| 1704 | spin_lock_irq(&blkcg->lock); |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1705 | |
| 1706 | if (!is_leaf_weight) |
| 1707 | blkcg->cfq_weight = val; |
| 1708 | else |
| 1709 | blkcg->cfq_leaf_weight = val; |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1710 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1711 | hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1712 | struct cfq_group *cfqg = blkg_to_cfqg(blkg); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1713 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1714 | if (!cfqg) |
| 1715 | continue; |
| 1716 | |
| 1717 | if (!is_leaf_weight) { |
| 1718 | if (!cfqg->dev_weight) |
| 1719 | cfqg->new_weight = blkcg->cfq_weight; |
| 1720 | } else { |
| 1721 | if (!cfqg->dev_leaf_weight) |
| 1722 | cfqg->new_leaf_weight = blkcg->cfq_leaf_weight; |
| 1723 | } |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1724 | } |
| 1725 | |
| 1726 | spin_unlock_irq(&blkcg->lock); |
| 1727 | return 0; |
| 1728 | } |
| 1729 | |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1730 | static int cfq_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val) |
| 1731 | { |
| 1732 | return __cfq_set_weight(cgrp, cft, val, false); |
| 1733 | } |
| 1734 | |
| 1735 | static int cfq_set_leaf_weight(struct cgroup *cgrp, struct cftype *cft, u64 val) |
| 1736 | { |
| 1737 | return __cfq_set_weight(cgrp, cft, val, true); |
| 1738 | } |
| 1739 | |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1740 | static int cfqg_print_stat(struct cgroup *cgrp, struct cftype *cft, |
| 1741 | struct seq_file *sf) |
| 1742 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1743 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1744 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1745 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat, &blkcg_policy_cfq, |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1746 | cft->private, false); |
| 1747 | return 0; |
| 1748 | } |
| 1749 | |
| 1750 | static int cfqg_print_rwstat(struct cgroup *cgrp, struct cftype *cft, |
| 1751 | struct seq_file *sf) |
| 1752 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1753 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1754 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1755 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat, &blkcg_policy_cfq, |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1756 | cft->private, true); |
| 1757 | return 0; |
| 1758 | } |
| 1759 | |
Tejun Heo | 4311401 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1760 | static u64 cfqg_prfill_stat_recursive(struct seq_file *sf, |
| 1761 | struct blkg_policy_data *pd, int off) |
| 1762 | { |
| 1763 | u64 sum = cfqg_stat_pd_recursive_sum(pd, off); |
| 1764 | |
| 1765 | return __blkg_prfill_u64(sf, pd, sum); |
| 1766 | } |
| 1767 | |
| 1768 | static u64 cfqg_prfill_rwstat_recursive(struct seq_file *sf, |
| 1769 | struct blkg_policy_data *pd, int off) |
| 1770 | { |
| 1771 | struct blkg_rwstat sum = cfqg_rwstat_pd_recursive_sum(pd, off); |
| 1772 | |
| 1773 | return __blkg_prfill_rwstat(sf, pd, &sum); |
| 1774 | } |
| 1775 | |
| 1776 | static int cfqg_print_stat_recursive(struct cgroup *cgrp, struct cftype *cft, |
| 1777 | struct seq_file *sf) |
| 1778 | { |
| 1779 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
| 1780 | |
| 1781 | blkcg_print_blkgs(sf, blkcg, cfqg_prfill_stat_recursive, |
| 1782 | &blkcg_policy_cfq, cft->private, false); |
| 1783 | return 0; |
| 1784 | } |
| 1785 | |
| 1786 | static int cfqg_print_rwstat_recursive(struct cgroup *cgrp, struct cftype *cft, |
| 1787 | struct seq_file *sf) |
| 1788 | { |
| 1789 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
| 1790 | |
| 1791 | blkcg_print_blkgs(sf, blkcg, cfqg_prfill_rwstat_recursive, |
| 1792 | &blkcg_policy_cfq, cft->private, true); |
| 1793 | return 0; |
| 1794 | } |
| 1795 | |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1796 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1797 | static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf, |
| 1798 | struct blkg_policy_data *pd, int off) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1799 | { |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1800 | struct cfq_group *cfqg = pd_to_cfqg(pd); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1801 | u64 samples = blkg_stat_read(&cfqg->stats.avg_queue_size_samples); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1802 | u64 v = 0; |
| 1803 | |
| 1804 | if (samples) { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1805 | v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1806 | do_div(v, samples); |
| 1807 | } |
Tejun Heo | f95a04a | 2012-04-16 13:57:26 -0700 | [diff] [blame] | 1808 | __blkg_prfill_u64(sf, pd, v); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1809 | return 0; |
| 1810 | } |
| 1811 | |
| 1812 | /* print avg_queue_size */ |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1813 | static int cfqg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft, |
| 1814 | struct seq_file *sf) |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1815 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1816 | struct blkcg *blkcg = cgroup_to_blkcg(cgrp); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1817 | |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1818 | blkcg_print_blkgs(sf, blkcg, cfqg_prfill_avg_queue_size, |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1819 | &blkcg_policy_cfq, 0, false); |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1820 | return 0; |
| 1821 | } |
| 1822 | #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
| 1823 | |
| 1824 | static struct cftype cfq_blkcg_files[] = { |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1825 | /* on root, weight is mapped to leaf_weight */ |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1826 | { |
| 1827 | .name = "weight_device", |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1828 | .flags = CFTYPE_ONLY_ON_ROOT, |
| 1829 | .read_seq_string = cfqg_print_leaf_weight_device, |
| 1830 | .write_string = cfqg_set_leaf_weight_device, |
| 1831 | .max_write_len = 256, |
| 1832 | }, |
| 1833 | { |
| 1834 | .name = "weight", |
| 1835 | .flags = CFTYPE_ONLY_ON_ROOT, |
| 1836 | .read_seq_string = cfq_print_leaf_weight, |
| 1837 | .write_u64 = cfq_set_leaf_weight, |
| 1838 | }, |
| 1839 | |
| 1840 | /* no such mapping necessary for !roots */ |
| 1841 | { |
| 1842 | .name = "weight_device", |
| 1843 | .flags = CFTYPE_NOT_ON_ROOT, |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1844 | .read_seq_string = cfqg_print_weight_device, |
| 1845 | .write_string = cfqg_set_weight_device, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1846 | .max_write_len = 256, |
| 1847 | }, |
| 1848 | { |
| 1849 | .name = "weight", |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1850 | .flags = CFTYPE_NOT_ON_ROOT, |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1851 | .read_seq_string = cfq_print_weight, |
| 1852 | .write_u64 = cfq_set_weight, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1853 | }, |
Tejun Heo | 1d3650f | 2013-01-09 08:05:11 -0800 | [diff] [blame] | 1854 | |
| 1855 | { |
| 1856 | .name = "leaf_weight_device", |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1857 | .read_seq_string = cfqg_print_leaf_weight_device, |
| 1858 | .write_string = cfqg_set_leaf_weight_device, |
| 1859 | .max_write_len = 256, |
| 1860 | }, |
| 1861 | { |
| 1862 | .name = "leaf_weight", |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 1863 | .read_seq_string = cfq_print_leaf_weight, |
| 1864 | .write_u64 = cfq_set_leaf_weight, |
| 1865 | }, |
| 1866 | |
Tejun Heo | 4311401 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1867 | /* statistics, covers only the tasks in the cfqg */ |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1868 | { |
| 1869 | .name = "time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1870 | .private = offsetof(struct cfq_group, stats.time), |
| 1871 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1872 | }, |
| 1873 | { |
| 1874 | .name = "sectors", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1875 | .private = offsetof(struct cfq_group, stats.sectors), |
| 1876 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1877 | }, |
| 1878 | { |
| 1879 | .name = "io_service_bytes", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1880 | .private = offsetof(struct cfq_group, stats.service_bytes), |
| 1881 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1882 | }, |
| 1883 | { |
| 1884 | .name = "io_serviced", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1885 | .private = offsetof(struct cfq_group, stats.serviced), |
| 1886 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1887 | }, |
| 1888 | { |
| 1889 | .name = "io_service_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1890 | .private = offsetof(struct cfq_group, stats.service_time), |
| 1891 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1892 | }, |
| 1893 | { |
| 1894 | .name = "io_wait_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1895 | .private = offsetof(struct cfq_group, stats.wait_time), |
| 1896 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1897 | }, |
| 1898 | { |
| 1899 | .name = "io_merged", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1900 | .private = offsetof(struct cfq_group, stats.merged), |
| 1901 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1902 | }, |
| 1903 | { |
| 1904 | .name = "io_queued", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1905 | .private = offsetof(struct cfq_group, stats.queued), |
| 1906 | .read_seq_string = cfqg_print_rwstat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1907 | }, |
Tejun Heo | 4311401 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 1908 | |
| 1909 | /* the same statictics which cover the cfqg and its descendants */ |
| 1910 | { |
| 1911 | .name = "time_recursive", |
| 1912 | .private = offsetof(struct cfq_group, stats.time), |
| 1913 | .read_seq_string = cfqg_print_stat_recursive, |
| 1914 | }, |
| 1915 | { |
| 1916 | .name = "sectors_recursive", |
| 1917 | .private = offsetof(struct cfq_group, stats.sectors), |
| 1918 | .read_seq_string = cfqg_print_stat_recursive, |
| 1919 | }, |
| 1920 | { |
| 1921 | .name = "io_service_bytes_recursive", |
| 1922 | .private = offsetof(struct cfq_group, stats.service_bytes), |
| 1923 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1924 | }, |
| 1925 | { |
| 1926 | .name = "io_serviced_recursive", |
| 1927 | .private = offsetof(struct cfq_group, stats.serviced), |
| 1928 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1929 | }, |
| 1930 | { |
| 1931 | .name = "io_service_time_recursive", |
| 1932 | .private = offsetof(struct cfq_group, stats.service_time), |
| 1933 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1934 | }, |
| 1935 | { |
| 1936 | .name = "io_wait_time_recursive", |
| 1937 | .private = offsetof(struct cfq_group, stats.wait_time), |
| 1938 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1939 | }, |
| 1940 | { |
| 1941 | .name = "io_merged_recursive", |
| 1942 | .private = offsetof(struct cfq_group, stats.merged), |
| 1943 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1944 | }, |
| 1945 | { |
| 1946 | .name = "io_queued_recursive", |
| 1947 | .private = offsetof(struct cfq_group, stats.queued), |
| 1948 | .read_seq_string = cfqg_print_rwstat_recursive, |
| 1949 | }, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1950 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 1951 | { |
| 1952 | .name = "avg_queue_size", |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 1953 | .read_seq_string = cfqg_print_avg_queue_size, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1954 | }, |
| 1955 | { |
| 1956 | .name = "group_wait_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1957 | .private = offsetof(struct cfq_group, stats.group_wait_time), |
| 1958 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1959 | }, |
| 1960 | { |
| 1961 | .name = "idle_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1962 | .private = offsetof(struct cfq_group, stats.idle_time), |
| 1963 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1964 | }, |
| 1965 | { |
| 1966 | .name = "empty_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1967 | .private = offsetof(struct cfq_group, stats.empty_time), |
| 1968 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1969 | }, |
| 1970 | { |
| 1971 | .name = "dequeue", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1972 | .private = offsetof(struct cfq_group, stats.dequeue), |
| 1973 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1974 | }, |
| 1975 | { |
| 1976 | .name = "unaccounted_time", |
Tejun Heo | 5bc4afb1 | 2012-04-01 14:38:45 -0700 | [diff] [blame] | 1977 | .private = offsetof(struct cfq_group, stats.unaccounted_time), |
| 1978 | .read_seq_string = cfqg_print_stat, |
Tejun Heo | 60c2bc2 | 2012-04-01 14:38:43 -0700 | [diff] [blame] | 1979 | }, |
| 1980 | #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
| 1981 | { } /* terminate */ |
| 1982 | }; |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1983 | #else /* GROUP_IOSCHED */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 1984 | static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd, |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 1985 | struct blkcg *blkcg) |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1986 | { |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 1987 | return cfqd->root_group; |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1988 | } |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 1989 | |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 1990 | static inline void |
| 1991 | cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { |
| 1992 | cfqq->cfqg = cfqg; |
| 1993 | } |
| 1994 | |
| 1995 | #endif /* GROUP_IOSCHED */ |
| 1996 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 1997 | /* |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 1998 | * The cfqd->service_trees holds all pending cfq_queue's that have |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 1999 | * requests waiting to be processed. It is sorted in the order that |
| 2000 | * we will service the queues. |
| 2001 | */ |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2002 | static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 2003 | bool add_front) |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2004 | { |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 2005 | struct rb_node **p, *parent; |
| 2006 | struct cfq_queue *__cfqq; |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2007 | unsigned long rb_key; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2008 | struct cfq_rb_root *st; |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2009 | int left; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 2010 | int new_cfqq = 1; |
Vivek Goyal | ae30c28 | 2009-12-03 12:59:55 -0500 | [diff] [blame] | 2011 | |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2012 | st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq)); |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 2013 | if (cfq_class_idle(cfqq)) { |
| 2014 | rb_key = CFQ_IDLE_DELAY; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2015 | parent = rb_last(&st->rb); |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 2016 | if (parent && parent != &cfqq->rb_node) { |
| 2017 | __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
| 2018 | rb_key += __cfqq->rb_key; |
| 2019 | } else |
| 2020 | rb_key += jiffies; |
| 2021 | } else if (!add_front) { |
Jens Axboe | b9c8946 | 2009-10-06 20:53:44 +0200 | [diff] [blame] | 2022 | /* |
| 2023 | * Get our rb key offset. Subtract any residual slice |
| 2024 | * value carried from last service. A negative resid |
| 2025 | * count indicates slice overrun, and this should position |
| 2026 | * the next service time further away in the tree. |
| 2027 | */ |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2028 | rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies; |
Jens Axboe | b9c8946 | 2009-10-06 20:53:44 +0200 | [diff] [blame] | 2029 | rb_key -= cfqq->slice_resid; |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2030 | cfqq->slice_resid = 0; |
Corrado Zoccolo | 48e025e | 2009-10-05 08:49:23 +0200 | [diff] [blame] | 2031 | } else { |
| 2032 | rb_key = -HZ; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2033 | __cfqq = cfq_rb_first(st); |
Corrado Zoccolo | 48e025e | 2009-10-05 08:49:23 +0200 | [diff] [blame] | 2034 | rb_key += __cfqq ? __cfqq->rb_key : jiffies; |
| 2035 | } |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2036 | |
| 2037 | if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 2038 | new_cfqq = 0; |
Jens Axboe | 99f9628 | 2007-02-05 11:56:25 +0100 | [diff] [blame] | 2039 | /* |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2040 | * same position, nothing more to do |
Jens Axboe | 99f9628 | 2007-02-05 11:56:25 +0100 | [diff] [blame] | 2041 | */ |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2042 | if (rb_key == cfqq->rb_key && cfqq->service_tree == st) |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2043 | return; |
Jens Axboe | 53b03744 | 2006-07-28 09:48:51 +0200 | [diff] [blame] | 2044 | |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 2045 | cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); |
| 2046 | cfqq->service_tree = NULL; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2047 | } |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2048 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2049 | left = 1; |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 2050 | parent = NULL; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2051 | cfqq->service_tree = st; |
| 2052 | p = &st->rb.rb_node; |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2053 | while (*p) { |
| 2054 | parent = *p; |
| 2055 | __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
| 2056 | |
Jens Axboe | 0c534e0 | 2007-04-18 20:01:57 +0200 | [diff] [blame] | 2057 | /* |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2058 | * sort by key, that represents service time. |
Jens Axboe | 0c534e0 | 2007-04-18 20:01:57 +0200 | [diff] [blame] | 2059 | */ |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2060 | if (time_before(rb_key, __cfqq->rb_key)) |
Vivek Goyal | 1f23f12 | 2012-10-03 16:57:00 -0400 | [diff] [blame] | 2061 | p = &parent->rb_left; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2062 | else { |
Vivek Goyal | 1f23f12 | 2012-10-03 16:57:00 -0400 | [diff] [blame] | 2063 | p = &parent->rb_right; |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 2064 | left = 0; |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2065 | } |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2066 | } |
| 2067 | |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 2068 | if (left) |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2069 | st->left = &cfqq->rb_node; |
Jens Axboe | cc09e29 | 2007-04-26 12:53:50 +0200 | [diff] [blame] | 2070 | |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2071 | cfqq->rb_key = rb_key; |
| 2072 | rb_link_node(&cfqq->rb_node, parent, p); |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2073 | rb_insert_color(&cfqq->rb_node, &st->rb); |
| 2074 | st->count++; |
Namhyung Kim | 20359f2 | 2011-05-24 10:23:22 +0200 | [diff] [blame] | 2075 | if (add_front || !new_cfqq) |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 2076 | return; |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 2077 | cfq_group_notify_queue_add(cfqd, cfqq->cfqg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | } |
| 2079 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2080 | static struct cfq_queue * |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2081 | cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root, |
| 2082 | sector_t sector, struct rb_node **ret_parent, |
| 2083 | struct rb_node ***rb_link) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2084 | { |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2085 | struct rb_node **p, *parent; |
| 2086 | struct cfq_queue *cfqq = NULL; |
| 2087 | |
| 2088 | parent = NULL; |
| 2089 | p = &root->rb_node; |
| 2090 | while (*p) { |
| 2091 | struct rb_node **n; |
| 2092 | |
| 2093 | parent = *p; |
| 2094 | cfqq = rb_entry(parent, struct cfq_queue, p_node); |
| 2095 | |
| 2096 | /* |
| 2097 | * Sort strictly based on sector. Smallest to the left, |
| 2098 | * largest to the right. |
| 2099 | */ |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 2100 | if (sector > blk_rq_pos(cfqq->next_rq)) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2101 | n = &(*p)->rb_right; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 2102 | else if (sector < blk_rq_pos(cfqq->next_rq)) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2103 | n = &(*p)->rb_left; |
| 2104 | else |
| 2105 | break; |
| 2106 | p = n; |
Jens Axboe | 3ac6c9f | 2009-04-23 12:14:56 +0200 | [diff] [blame] | 2107 | cfqq = NULL; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2108 | } |
| 2109 | |
| 2110 | *ret_parent = parent; |
| 2111 | if (rb_link) |
| 2112 | *rb_link = p; |
Jens Axboe | 3ac6c9f | 2009-04-23 12:14:56 +0200 | [diff] [blame] | 2113 | return cfqq; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2114 | } |
| 2115 | |
| 2116 | static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 2117 | { |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2118 | struct rb_node **p, *parent; |
| 2119 | struct cfq_queue *__cfqq; |
| 2120 | |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2121 | if (cfqq->p_root) { |
| 2122 | rb_erase(&cfqq->p_node, cfqq->p_root); |
| 2123 | cfqq->p_root = NULL; |
| 2124 | } |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2125 | |
| 2126 | if (cfq_class_idle(cfqq)) |
| 2127 | return; |
| 2128 | if (!cfqq->next_rq) |
| 2129 | return; |
| 2130 | |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2131 | cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 2132 | __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, |
| 2133 | blk_rq_pos(cfqq->next_rq), &parent, &p); |
Jens Axboe | 3ac6c9f | 2009-04-23 12:14:56 +0200 | [diff] [blame] | 2134 | if (!__cfqq) { |
| 2135 | rb_link_node(&cfqq->p_node, parent, p); |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2136 | rb_insert_color(&cfqq->p_node, cfqq->p_root); |
| 2137 | } else |
| 2138 | cfqq->p_root = NULL; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2139 | } |
| 2140 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2141 | /* |
| 2142 | * Update cfqq's position in the service tree. |
| 2143 | */ |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2144 | static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2145 | { |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2146 | /* |
| 2147 | * Resorting requires the cfqq to be on the RR list already. |
| 2148 | */ |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2149 | if (cfq_cfqq_on_rr(cfqq)) { |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2150 | cfq_service_tree_add(cfqd, cfqq, 0); |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2151 | cfq_prio_tree_add(cfqd, cfqq); |
| 2152 | } |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2153 | } |
| 2154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | /* |
| 2156 | * add to busy list of queues for service, trying to be fair in ordering |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2157 | * the pending list according to last request service |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | */ |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2159 | static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | { |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2161 | cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 2162 | BUG_ON(cfq_cfqq_on_rr(cfqq)); |
| 2163 | cfq_mark_cfqq_on_rr(cfqq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | cfqd->busy_queues++; |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 2165 | if (cfq_cfqq_sync(cfqq)) |
| 2166 | cfqd->busy_sync_queues++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2168 | cfq_resort_rr_list(cfqd, cfqq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | } |
| 2170 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2171 | /* |
| 2172 | * Called when the cfqq no longer has requests pending, remove it from |
| 2173 | * the service tree. |
| 2174 | */ |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2175 | static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | { |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2177 | cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 2178 | BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
| 2179 | cfq_clear_cfqq_on_rr(cfqq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 2181 | if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
| 2182 | cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); |
| 2183 | cfqq->service_tree = NULL; |
| 2184 | } |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2185 | if (cfqq->p_root) { |
| 2186 | rb_erase(&cfqq->p_node, cfqq->p_root); |
| 2187 | cfqq->p_root = NULL; |
| 2188 | } |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2189 | |
Justin TerAvest | 8184f93 | 2011-03-17 16:12:36 +0100 | [diff] [blame] | 2190 | cfq_group_notify_queue_del(cfqd, cfqq->cfqg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | BUG_ON(!cfqd->busy_queues); |
| 2192 | cfqd->busy_queues--; |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 2193 | if (cfq_cfqq_sync(cfqq)) |
| 2194 | cfqd->busy_sync_queues--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | } |
| 2196 | |
| 2197 | /* |
| 2198 | * rb tree support functions |
| 2199 | */ |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2200 | static void cfq_del_rq_rb(struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2202 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2203 | const int sync = rq_is_sync(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2205 | BUG_ON(!cfqq->queued[sync]); |
| 2206 | cfqq->queued[sync]--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2208 | elv_rb_del(&cfqq->sort_list, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2210 | if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) { |
| 2211 | /* |
| 2212 | * Queue will be deleted from service tree when we actually |
| 2213 | * expire it later. Right now just remove it from prio tree |
| 2214 | * as it is empty. |
| 2215 | */ |
| 2216 | if (cfqq->p_root) { |
| 2217 | rb_erase(&cfqq->p_node, cfqq->p_root); |
| 2218 | cfqq->p_root = NULL; |
| 2219 | } |
| 2220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | } |
| 2222 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2223 | static void cfq_add_rq_rb(struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2225 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | struct cfq_data *cfqd = cfqq->cfqd; |
Jeff Moyer | 796d511 | 2011-06-02 21:19:05 +0200 | [diff] [blame] | 2227 | struct request *prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | |
Jens Axboe | 5380a10 | 2006-07-13 12:37:56 +0200 | [diff] [blame] | 2229 | cfqq->queued[rq_is_sync(rq)]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | |
Jeff Moyer | 796d511 | 2011-06-02 21:19:05 +0200 | [diff] [blame] | 2231 | elv_rb_add(&cfqq->sort_list, rq); |
Jens Axboe | 5fccbf6 | 2006-10-31 14:21:55 +0100 | [diff] [blame] | 2232 | |
| 2233 | if (!cfq_cfqq_on_rr(cfqq)) |
| 2234 | cfq_add_cfqq_rr(cfqd, cfqq); |
Jens Axboe | 5044eed | 2007-04-25 11:53:48 +0200 | [diff] [blame] | 2235 | |
| 2236 | /* |
| 2237 | * check if this request is a better next-serve candidate |
| 2238 | */ |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2239 | prev = cfqq->next_rq; |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 2240 | cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq, cfqd->last_position); |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2241 | |
| 2242 | /* |
| 2243 | * adjust priority tree position, if ->next_rq changes |
| 2244 | */ |
| 2245 | if (prev != cfqq->next_rq) |
| 2246 | cfq_prio_tree_add(cfqd, cfqq); |
| 2247 | |
Jens Axboe | 5044eed | 2007-04-25 11:53:48 +0200 | [diff] [blame] | 2248 | BUG_ON(!cfqq->next_rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | } |
| 2250 | |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2251 | static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | { |
Jens Axboe | 5380a10 | 2006-07-13 12:37:56 +0200 | [diff] [blame] | 2253 | elv_rb_del(&cfqq->sort_list, rq); |
| 2254 | cfqq->queued[rq_is_sync(rq)]--; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2255 | cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2256 | cfq_add_rq_rb(rq); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2257 | cfqg_stats_update_io_add(RQ_CFQG(rq), cfqq->cfqd->serving_group, |
| 2258 | rq->cmd_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | } |
| 2260 | |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2261 | static struct request * |
| 2262 | cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | { |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2264 | struct task_struct *tsk = current; |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 2265 | struct cfq_io_cq *cic; |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2266 | struct cfq_queue *cfqq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | |
Jens Axboe | 4ac845a | 2008-01-24 08:44:49 +0100 | [diff] [blame] | 2268 | cic = cfq_cic_lookup(cfqd, tsk->io_context); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 2269 | if (!cic) |
| 2270 | return NULL; |
| 2271 | |
| 2272 | cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
Kent Overstreet | f73a1c7 | 2012-09-25 15:05:12 -0700 | [diff] [blame] | 2273 | if (cfqq) |
| 2274 | return elv_rb_find(&cfqq->sort_list, bio_end_sector(bio)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | return NULL; |
| 2277 | } |
| 2278 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2279 | static void cfq_activate_request(struct request_queue *q, struct request *rq) |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2280 | { |
| 2281 | struct cfq_data *cfqd = q->elevator->elevator_data; |
| 2282 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 2283 | cfqd->rq_in_driver++; |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2284 | cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 2285 | cfqd->rq_in_driver); |
Jens Axboe | 25776e3 | 2006-06-01 10:12:26 +0200 | [diff] [blame] | 2286 | |
Tejun Heo | 5b93629 | 2009-05-07 22:24:38 +0900 | [diff] [blame] | 2287 | cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2288 | } |
| 2289 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2290 | static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2292 | struct cfq_data *cfqd = q->elevator->elevator_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 2294 | WARN_ON(!cfqd->rq_in_driver); |
| 2295 | cfqd->rq_in_driver--; |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2296 | cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 2297 | cfqd->rq_in_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | } |
| 2299 | |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2300 | static void cfq_remove_request(struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2302 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 2303 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2304 | if (cfqq->next_rq == rq) |
| 2305 | cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2307 | list_del_init(&rq->queuelist); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2308 | cfq_del_rq_rb(rq); |
Jens Axboe | 374f84a | 2006-07-23 01:42:19 +0200 | [diff] [blame] | 2309 | |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 2310 | cfqq->cfqd->rq_queued--; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2311 | cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags); |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 2312 | if (rq->cmd_flags & REQ_PRIO) { |
| 2313 | WARN_ON(!cfqq->prio_pending); |
| 2314 | cfqq->prio_pending--; |
Jens Axboe | b53d1ed | 2011-08-19 08:34:48 +0200 | [diff] [blame] | 2315 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | } |
| 2317 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2318 | static int cfq_merge(struct request_queue *q, struct request **req, |
| 2319 | struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | { |
| 2321 | struct cfq_data *cfqd = q->elevator->elevator_data; |
| 2322 | struct request *__rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2324 | __rq = cfq_find_rq_fmerge(cfqd, bio); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2325 | if (__rq && elv_rq_merge_ok(__rq, bio)) { |
Jens Axboe | 9817064 | 2006-07-28 09:23:08 +0200 | [diff] [blame] | 2326 | *req = __rq; |
| 2327 | return ELEVATOR_FRONT_MERGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | } |
| 2329 | |
| 2330 | return ELEVATOR_NO_MERGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | } |
| 2332 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2333 | static void cfq_merged_request(struct request_queue *q, struct request *req, |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 2334 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | { |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 2336 | if (type == ELEVATOR_FRONT_MERGE) { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2337 | struct cfq_queue *cfqq = RQ_CFQQ(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2339 | cfq_reposition_rq_rb(cfqq, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | } |
| 2342 | |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 2343 | static void cfq_bio_merged(struct request_queue *q, struct request *req, |
| 2344 | struct bio *bio) |
| 2345 | { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2346 | cfqg_stats_update_io_merged(RQ_CFQG(req), bio->bi_rw); |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 2347 | } |
| 2348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | static void |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2350 | cfq_merged_requests(struct request_queue *q, struct request *rq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | struct request *next) |
| 2352 | { |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 2353 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Shaohua Li | 4a0b75c | 2011-12-16 14:00:22 +0100 | [diff] [blame] | 2354 | struct cfq_data *cfqd = q->elevator->elevator_data; |
| 2355 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2356 | /* |
| 2357 | * reposition in fifo if next is older than rq |
| 2358 | */ |
| 2359 | if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && |
Shaohua Li | 3d106fba | 2012-11-06 12:39:51 +0100 | [diff] [blame] | 2360 | time_before(rq_fifo_time(next), rq_fifo_time(rq)) && |
| 2361 | cfqq == RQ_CFQQ(next)) { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2362 | list_move(&rq->queuelist, &next->queuelist); |
Jens Axboe | 30996f4 | 2009-10-05 11:03:39 +0200 | [diff] [blame] | 2363 | rq_set_fifo_time(rq, rq_fifo_time(next)); |
| 2364 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2365 | |
Corrado Zoccolo | cf7c25c | 2009-11-08 17:16:46 +0100 | [diff] [blame] | 2366 | if (cfqq->next_rq == next) |
| 2367 | cfqq->next_rq = rq; |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 2368 | cfq_remove_request(next); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2369 | cfqg_stats_update_io_merged(RQ_CFQG(rq), next->cmd_flags); |
Shaohua Li | 4a0b75c | 2011-12-16 14:00:22 +0100 | [diff] [blame] | 2370 | |
| 2371 | cfqq = RQ_CFQQ(next); |
| 2372 | /* |
| 2373 | * all requests of this queue are merged to other queues, delete it |
| 2374 | * from the service tree. If it's the active_queue, |
| 2375 | * cfq_dispatch_requests() will choose to expire it or do idle |
| 2376 | */ |
| 2377 | if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list) && |
| 2378 | cfqq != cfqd->active_queue) |
| 2379 | cfq_del_cfqq_rr(cfqd, cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2380 | } |
| 2381 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2382 | static int cfq_allow_merge(struct request_queue *q, struct request *rq, |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2383 | struct bio *bio) |
| 2384 | { |
| 2385 | struct cfq_data *cfqd = q->elevator->elevator_data; |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 2386 | struct cfq_io_cq *cic; |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2387 | struct cfq_queue *cfqq; |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2388 | |
| 2389 | /* |
Jens Axboe | ec8acb6 | 2007-01-02 18:32:11 +0100 | [diff] [blame] | 2390 | * Disallow merge of a sync bio into an async request. |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2391 | */ |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 2392 | if (cfq_bio_sync(bio) && !rq_is_sync(rq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 2393 | return false; |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2394 | |
| 2395 | /* |
Tejun Heo | f1a4f4d | 2011-12-14 00:33:39 +0100 | [diff] [blame] | 2396 | * Lookup the cfqq that this bio will be queued with and allow |
Tejun Heo | 07c2bd3 | 2012-02-08 09:19:42 +0100 | [diff] [blame] | 2397 | * merge only if rq is queued there. |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2398 | */ |
Tejun Heo | 07c2bd3 | 2012-02-08 09:19:42 +0100 | [diff] [blame] | 2399 | cic = cfq_cic_lookup(cfqd, current->io_context); |
| 2400 | if (!cic) |
| 2401 | return false; |
Jens Axboe | 719d340 | 2006-12-22 09:38:53 +0100 | [diff] [blame] | 2402 | |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 2403 | cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 2404 | return cfqq == RQ_CFQQ(rq); |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 2405 | } |
| 2406 | |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 2407 | static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 2408 | { |
| 2409 | del_timer(&cfqd->idle_slice_timer); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2410 | cfqg_stats_update_idle_time(cfqq->cfqg); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 2411 | } |
| 2412 | |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2413 | static void __cfq_set_active_queue(struct cfq_data *cfqd, |
| 2414 | struct cfq_queue *cfqq) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2415 | { |
| 2416 | if (cfqq) { |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 2417 | cfq_log_cfqq(cfqd, cfqq, "set_active wl_class:%d wl_type:%d", |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2418 | cfqd->serving_wl_class, cfqd->serving_wl_type); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2419 | cfqg_stats_update_avg_queue_size(cfqq->cfqg); |
Justin TerAvest | 62a37f6 | 2011-03-23 08:25:44 +0100 | [diff] [blame] | 2420 | cfqq->slice_start = 0; |
| 2421 | cfqq->dispatch_start = jiffies; |
| 2422 | cfqq->allocated_slice = 0; |
| 2423 | cfqq->slice_end = 0; |
| 2424 | cfqq->slice_dispatch = 0; |
| 2425 | cfqq->nr_sectors = 0; |
| 2426 | |
| 2427 | cfq_clear_cfqq_wait_request(cfqq); |
| 2428 | cfq_clear_cfqq_must_dispatch(cfqq); |
| 2429 | cfq_clear_cfqq_must_alloc_slice(cfqq); |
| 2430 | cfq_clear_cfqq_fifo_expire(cfqq); |
| 2431 | cfq_mark_cfqq_slice_new(cfqq); |
| 2432 | |
| 2433 | cfq_del_timer(cfqd, cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2434 | } |
| 2435 | |
| 2436 | cfqd->active_queue = cfqq; |
| 2437 | } |
| 2438 | |
| 2439 | /* |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2440 | * current cfqq expired its slice (or was too idle), select new one |
| 2441 | */ |
| 2442 | static void |
| 2443 | __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 2444 | bool timed_out) |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2445 | { |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2446 | cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); |
| 2447 | |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2448 | if (cfq_cfqq_wait_request(cfqq)) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 2449 | cfq_del_timer(cfqd, cfqq); |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2450 | |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2451 | cfq_clear_cfqq_wait_request(cfqq); |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 2452 | cfq_clear_cfqq_wait_busy(cfqq); |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2453 | |
| 2454 | /* |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 2455 | * If this cfqq is shared between multiple processes, check to |
| 2456 | * make sure that those processes are still issuing I/Os within |
| 2457 | * the mean seek distance. If not, it may be time to break the |
| 2458 | * queues apart again. |
| 2459 | */ |
| 2460 | if (cfq_cfqq_coop(cfqq) && CFQQ_SEEKY(cfqq)) |
| 2461 | cfq_mark_cfqq_split_coop(cfqq); |
| 2462 | |
| 2463 | /* |
Jens Axboe | 6084cdd | 2007-04-23 08:25:00 +0200 | [diff] [blame] | 2464 | * store what was left of this slice, if the queue idled/timed out |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2465 | */ |
Shaohua Li | c553f8e | 2011-01-14 08:41:03 +0100 | [diff] [blame] | 2466 | if (timed_out) { |
| 2467 | if (cfq_cfqq_slice_new(cfqq)) |
Vivek Goyal | ba5bd52 | 2011-01-19 08:25:02 -0700 | [diff] [blame] | 2468 | cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); |
Shaohua Li | c553f8e | 2011-01-14 08:41:03 +0100 | [diff] [blame] | 2469 | else |
| 2470 | cfqq->slice_resid = cfqq->slice_end - jiffies; |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2471 | cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid); |
| 2472 | } |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2473 | |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 2474 | cfq_group_served(cfqd, cfqq->cfqg, cfqq); |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 2475 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2476 | if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) |
| 2477 | cfq_del_cfqq_rr(cfqd, cfqq); |
| 2478 | |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2479 | cfq_resort_rr_list(cfqd, cfqq); |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2480 | |
| 2481 | if (cfqq == cfqd->active_queue) |
| 2482 | cfqd->active_queue = NULL; |
| 2483 | |
| 2484 | if (cfqd->active_cic) { |
Tejun Heo | 11a3122 | 2012-02-07 07:51:30 +0100 | [diff] [blame] | 2485 | put_io_context(cfqd->active_cic->icq.ioc); |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2486 | cfqd->active_cic = NULL; |
| 2487 | } |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2488 | } |
| 2489 | |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 2490 | static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out) |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2491 | { |
| 2492 | struct cfq_queue *cfqq = cfqd->active_queue; |
| 2493 | |
| 2494 | if (cfqq) |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 2495 | __cfq_slice_expired(cfqd, cfqq, timed_out); |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2496 | } |
| 2497 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2498 | /* |
| 2499 | * Get next queue for service. Unless we have a queue preemption, |
| 2500 | * we'll simply select the first cfqq in the service tree. |
| 2501 | */ |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2502 | static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2503 | { |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2504 | struct cfq_rb_root *st = st_for(cfqd->serving_group, |
| 2505 | cfqd->serving_wl_class, cfqd->serving_wl_type); |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 2506 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2507 | if (!cfqd->rq_queued) |
| 2508 | return NULL; |
| 2509 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2510 | /* There is nothing to dispatch */ |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2511 | if (!st) |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2512 | return NULL; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2513 | if (RB_EMPTY_ROOT(&st->rb)) |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2514 | return NULL; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2515 | return cfq_rb_first(st); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2516 | } |
| 2517 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2518 | static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) |
| 2519 | { |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 2520 | struct cfq_group *cfqg; |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2521 | struct cfq_queue *cfqq; |
| 2522 | int i, j; |
| 2523 | struct cfq_rb_root *st; |
| 2524 | |
| 2525 | if (!cfqd->rq_queued) |
| 2526 | return NULL; |
| 2527 | |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 2528 | cfqg = cfq_get_next_cfqg(cfqd); |
| 2529 | if (!cfqg) |
| 2530 | return NULL; |
| 2531 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2532 | for_each_cfqg_st(cfqg, i, j, st) |
| 2533 | if ((cfqq = cfq_rb_first(st)) != NULL) |
| 2534 | return cfqq; |
| 2535 | return NULL; |
| 2536 | } |
| 2537 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2538 | /* |
| 2539 | * Get and set a new active queue for service. |
| 2540 | */ |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2541 | static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd, |
| 2542 | struct cfq_queue *cfqq) |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2543 | { |
Jens Axboe | e00ef79 | 2009-11-04 08:54:55 +0100 | [diff] [blame] | 2544 | if (!cfqq) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2545 | cfqq = cfq_get_next_queue(cfqd); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2546 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2547 | __cfq_set_active_queue(cfqd, cfqq); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 2548 | return cfqq; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2549 | } |
| 2550 | |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2551 | static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, |
| 2552 | struct request *rq) |
| 2553 | { |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 2554 | if (blk_rq_pos(rq) >= cfqd->last_position) |
| 2555 | return blk_rq_pos(rq) - cfqd->last_position; |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2556 | else |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 2557 | return cfqd->last_position - blk_rq_pos(rq); |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2558 | } |
| 2559 | |
Jeff Moyer | b2c18e1 | 2009-10-23 17:14:49 -0400 | [diff] [blame] | 2560 | static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 2561 | struct request *rq) |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2562 | { |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 2563 | return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR; |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2564 | } |
| 2565 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2566 | static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, |
| 2567 | struct cfq_queue *cur_cfqq) |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2568 | { |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2569 | struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2570 | struct rb_node *parent, *node; |
| 2571 | struct cfq_queue *__cfqq; |
| 2572 | sector_t sector = cfqd->last_position; |
| 2573 | |
| 2574 | if (RB_EMPTY_ROOT(root)) |
| 2575 | return NULL; |
| 2576 | |
| 2577 | /* |
| 2578 | * First, if we find a request starting at the end of the last |
| 2579 | * request, choose it. |
| 2580 | */ |
Jens Axboe | f2d1f0a | 2009-04-23 12:19:38 +0200 | [diff] [blame] | 2581 | __cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2582 | if (__cfqq) |
| 2583 | return __cfqq; |
| 2584 | |
| 2585 | /* |
| 2586 | * If the exact sector wasn't found, the parent of the NULL leaf |
| 2587 | * will contain the closest sector. |
| 2588 | */ |
| 2589 | __cfqq = rb_entry(parent, struct cfq_queue, p_node); |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 2590 | if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2591 | return __cfqq; |
| 2592 | |
Tejun Heo | 2e46e8b | 2009-05-07 22:24:41 +0900 | [diff] [blame] | 2593 | if (blk_rq_pos(__cfqq->next_rq) < sector) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2594 | node = rb_next(&__cfqq->p_node); |
| 2595 | else |
| 2596 | node = rb_prev(&__cfqq->p_node); |
| 2597 | if (!node) |
| 2598 | return NULL; |
| 2599 | |
| 2600 | __cfqq = rb_entry(node, struct cfq_queue, p_node); |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 2601 | if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2602 | return __cfqq; |
| 2603 | |
| 2604 | return NULL; |
| 2605 | } |
| 2606 | |
| 2607 | /* |
| 2608 | * cfqd - obvious |
| 2609 | * cur_cfqq - passed in so that we don't decide that the current queue is |
| 2610 | * closely cooperating with itself. |
| 2611 | * |
| 2612 | * So, basically we're assuming that that cur_cfqq has dispatched at least |
| 2613 | * one request, and that cfqd->last_position reflects a position on the disk |
| 2614 | * associated with the I/O issued by cur_cfqq. I'm not sure this is a valid |
| 2615 | * assumption. |
| 2616 | */ |
| 2617 | static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd, |
Jeff Moyer | b3b6d04 | 2009-10-23 17:14:51 -0400 | [diff] [blame] | 2618 | struct cfq_queue *cur_cfqq) |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2619 | { |
| 2620 | struct cfq_queue *cfqq; |
| 2621 | |
Divyesh Shah | 39c01b2 | 2010-03-25 15:45:57 +0100 | [diff] [blame] | 2622 | if (cfq_class_idle(cur_cfqq)) |
| 2623 | return NULL; |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2624 | if (!cfq_cfqq_sync(cur_cfqq)) |
| 2625 | return NULL; |
| 2626 | if (CFQQ_SEEKY(cur_cfqq)) |
| 2627 | return NULL; |
| 2628 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2629 | /* |
Gui Jianfeng | b9d8f4c | 2009-12-08 08:54:17 +0100 | [diff] [blame] | 2630 | * Don't search priority tree if it's the only queue in the group. |
| 2631 | */ |
| 2632 | if (cur_cfqq->cfqg->nr_cfqq == 1) |
| 2633 | return NULL; |
| 2634 | |
| 2635 | /* |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 2636 | * We should notice if some of the queues are cooperating, eg |
| 2637 | * working closely on the same area of the disk. In that case, |
| 2638 | * we can group them together and don't waste time idling. |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2639 | */ |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2640 | cfqq = cfqq_close(cfqd, cur_cfqq); |
| 2641 | if (!cfqq) |
| 2642 | return NULL; |
| 2643 | |
Vivek Goyal | 8682e1f | 2009-12-03 12:59:50 -0500 | [diff] [blame] | 2644 | /* If new queue belongs to different cfq_group, don't choose it */ |
| 2645 | if (cur_cfqq->cfqg != cfqq->cfqg) |
| 2646 | return NULL; |
| 2647 | |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2648 | /* |
| 2649 | * It only makes sense to merge sync queues. |
| 2650 | */ |
| 2651 | if (!cfq_cfqq_sync(cfqq)) |
| 2652 | return NULL; |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2653 | if (CFQQ_SEEKY(cfqq)) |
| 2654 | return NULL; |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2655 | |
Corrado Zoccolo | c0324a0 | 2009-10-27 19:16:03 +0100 | [diff] [blame] | 2656 | /* |
| 2657 | * Do not merge queues of different priority classes |
| 2658 | */ |
| 2659 | if (cfq_class_rt(cfqq) != cfq_class_rt(cur_cfqq)) |
| 2660 | return NULL; |
| 2661 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 2662 | return cfqq; |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2663 | } |
| 2664 | |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2665 | /* |
| 2666 | * Determine whether we should enforce idle window for this queue. |
| 2667 | */ |
| 2668 | |
| 2669 | static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 2670 | { |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 2671 | enum wl_class_t wl_class = cfqq_class(cfqq); |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2672 | struct cfq_rb_root *st = cfqq->service_tree; |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2673 | |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2674 | BUG_ON(!st); |
| 2675 | BUG_ON(!st->count); |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 2676 | |
Vivek Goyal | b6508c1 | 2010-08-23 12:23:33 +0200 | [diff] [blame] | 2677 | if (!cfqd->cfq_slice_idle) |
| 2678 | return false; |
| 2679 | |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2680 | /* We never do for idle class queues. */ |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 2681 | if (wl_class == IDLE_WORKLOAD) |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2682 | return false; |
| 2683 | |
| 2684 | /* We do for queues that were marked with idle window flag. */ |
Shaohua Li | 3c764b7 | 2009-12-04 13:12:06 +0100 | [diff] [blame] | 2685 | if (cfq_cfqq_idle_window(cfqq) && |
| 2686 | !(blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)) |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2687 | return true; |
| 2688 | |
| 2689 | /* |
| 2690 | * Otherwise, we do only if they are the last ones |
| 2691 | * in their service tree. |
| 2692 | */ |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2693 | if (st->count == 1 && cfq_cfqq_sync(cfqq) && |
| 2694 | !cfq_io_thinktime_big(cfqd, &st->ttime, false)) |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 2695 | return true; |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2696 | cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", st->count); |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 2697 | return false; |
Corrado Zoccolo | a6d44e9 | 2009-10-26 22:45:11 +0100 | [diff] [blame] | 2698 | } |
| 2699 | |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2700 | static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2701 | { |
Jens Axboe | 1792669 | 2007-01-19 11:59:30 +1100 | [diff] [blame] | 2702 | struct cfq_queue *cfqq = cfqd->active_queue; |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 2703 | struct cfq_io_cq *cic; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2704 | unsigned long sl, group_idle = 0; |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2705 | |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 2706 | /* |
Jens Axboe | f7d7b7a | 2008-09-25 11:37:50 +0200 | [diff] [blame] | 2707 | * SSD device without seek penalty, disable idling. But only do so |
| 2708 | * for devices that support queuing, otherwise we still have a problem |
| 2709 | * with sync vs async workloads. |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 2710 | */ |
Jens Axboe | f7d7b7a | 2008-09-25 11:37:50 +0200 | [diff] [blame] | 2711 | if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag) |
Jens Axboe | a68bbdd | 2008-09-24 13:03:33 +0200 | [diff] [blame] | 2712 | return; |
| 2713 | |
Jens Axboe | dd67d05 | 2006-06-21 09:36:18 +0200 | [diff] [blame] | 2714 | WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2715 | WARN_ON(cfq_cfqq_slice_new(cfqq)); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2716 | |
| 2717 | /* |
| 2718 | * idle is disabled, either manually or by past process history |
| 2719 | */ |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2720 | if (!cfq_should_idle(cfqd, cfqq)) { |
| 2721 | /* no queue idling. Check for group idling */ |
| 2722 | if (cfqd->cfq_group_idle) |
| 2723 | group_idle = cfqd->cfq_group_idle; |
| 2724 | else |
| 2725 | return; |
| 2726 | } |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2727 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2728 | /* |
Corrado Zoccolo | 8e55063 | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 2729 | * still active requests from this queue, don't idle |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2730 | */ |
Corrado Zoccolo | 8e55063 | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 2731 | if (cfqq->dispatched) |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2732 | return; |
| 2733 | |
| 2734 | /* |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2735 | * task has exited, don't wait |
| 2736 | */ |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2737 | cic = cfqd->active_cic; |
Tejun Heo | f6e8d01 | 2012-03-05 13:15:26 -0800 | [diff] [blame] | 2738 | if (!cic || !atomic_read(&cic->icq.ioc->active_ref)) |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2739 | return; |
| 2740 | |
Corrado Zoccolo | 355b659 | 2009-10-08 08:43:32 +0200 | [diff] [blame] | 2741 | /* |
| 2742 | * If our average think time is larger than the remaining time |
| 2743 | * slice, then don't idle. This avoids overrunning the allotted |
| 2744 | * time slice. |
| 2745 | */ |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 2746 | if (sample_valid(cic->ttime.ttime_samples) && |
| 2747 | (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) { |
Joe Perches | fd16d26 | 2011-06-13 10:42:49 +0200 | [diff] [blame] | 2748 | cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu", |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 2749 | cic->ttime.ttime_mean); |
Corrado Zoccolo | 355b659 | 2009-10-08 08:43:32 +0200 | [diff] [blame] | 2750 | return; |
Divyesh Shah | b1ffe73 | 2010-03-25 15:45:03 +0100 | [diff] [blame] | 2751 | } |
Corrado Zoccolo | 355b659 | 2009-10-08 08:43:32 +0200 | [diff] [blame] | 2752 | |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2753 | /* There are other queues in the group, don't do group idle */ |
| 2754 | if (group_idle && cfqq->cfqg->nr_cfqq > 1) |
| 2755 | return; |
| 2756 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 2757 | cfq_mark_cfqq_wait_request(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2758 | |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2759 | if (group_idle) |
| 2760 | sl = cfqd->cfq_group_idle; |
| 2761 | else |
| 2762 | sl = cfqd->cfq_slice_idle; |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 2763 | |
Jens Axboe | 7b14e3b | 2006-02-28 09:35:11 +0100 | [diff] [blame] | 2764 | mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2765 | cfqg_stats_set_start_idle_time(cfqq->cfqg); |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2766 | cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu group_idle: %d", sl, |
| 2767 | group_idle ? 1 : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2768 | } |
| 2769 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 2770 | /* |
| 2771 | * Move request from internal lists to the request queue dispatch list. |
| 2772 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2773 | static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | { |
Jens Axboe | 3ed9a29 | 2007-04-23 08:33:33 +0200 | [diff] [blame] | 2775 | struct cfq_data *cfqd = q->elevator->elevator_data; |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 2776 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2777 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2778 | cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); |
| 2779 | |
Jeff Moyer | 06d2188 | 2009-09-11 17:08:59 +0200 | [diff] [blame] | 2780 | cfqq->next_rq = cfq_find_next_rq(cfqd, cfqq, rq); |
Jens Axboe | 5380a10 | 2006-07-13 12:37:56 +0200 | [diff] [blame] | 2781 | cfq_remove_request(rq); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2782 | cfqq->dispatched++; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 2783 | (RQ_CFQG(rq))->dispatched++; |
Jens Axboe | 5380a10 | 2006-07-13 12:37:56 +0200 | [diff] [blame] | 2784 | elv_dispatch_sort(q, rq); |
Jens Axboe | 3ed9a29 | 2007-04-23 08:33:33 +0200 | [diff] [blame] | 2785 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 2786 | cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++; |
Vivek Goyal | c4e7893 | 2010-08-23 12:25:03 +0200 | [diff] [blame] | 2787 | cfqq->nr_sectors += blk_rq_sectors(rq); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 2788 | cfqg_stats_update_dispatch(cfqq->cfqg, blk_rq_bytes(rq), rq->cmd_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | } |
| 2790 | |
| 2791 | /* |
| 2792 | * return expired entry, or NULL to just start from scratch in rbtree |
| 2793 | */ |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 2794 | static struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2795 | { |
Jens Axboe | 30996f4 | 2009-10-05 11:03:39 +0200 | [diff] [blame] | 2796 | struct request *rq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 2798 | if (cfq_cfqq_fifo_expire(cfqq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | return NULL; |
Jens Axboe | cb88741 | 2007-01-19 12:01:16 +1100 | [diff] [blame] | 2800 | |
| 2801 | cfq_mark_cfqq_fifo_expire(cfqq); |
| 2802 | |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 2803 | if (list_empty(&cfqq->fifo)) |
| 2804 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 2806 | rq = rq_entry_fifo(cfqq->fifo.next); |
Jens Axboe | 30996f4 | 2009-10-05 11:03:39 +0200 | [diff] [blame] | 2807 | if (time_before(jiffies, rq_fifo_time(rq))) |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 2808 | rq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | |
Jens Axboe | 30996f4 | 2009-10-05 11:03:39 +0200 | [diff] [blame] | 2810 | cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 2811 | return rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2812 | } |
| 2813 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2814 | static inline int |
| 2815 | cfq_prio_to_maxrq(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 2816 | { |
| 2817 | const int base_rq = cfqd->cfq_slice_async_rq; |
| 2818 | |
| 2819 | WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
| 2820 | |
Namhyung Kim | b9f8ce0 | 2011-05-24 10:23:21 +0200 | [diff] [blame] | 2821 | return 2 * base_rq * (IOPRIO_BE_NR - cfqq->ioprio); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 2822 | } |
| 2823 | |
| 2824 | /* |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2825 | * Must be called with the queue_lock held. |
| 2826 | */ |
| 2827 | static int cfqq_process_refs(struct cfq_queue *cfqq) |
| 2828 | { |
| 2829 | int process_refs, io_refs; |
| 2830 | |
| 2831 | io_refs = cfqq->allocated[READ] + cfqq->allocated[WRITE]; |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 2832 | process_refs = cfqq->ref - io_refs; |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2833 | BUG_ON(process_refs < 0); |
| 2834 | return process_refs; |
| 2835 | } |
| 2836 | |
| 2837 | static void cfq_setup_merge(struct cfq_queue *cfqq, struct cfq_queue *new_cfqq) |
| 2838 | { |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2839 | int process_refs, new_process_refs; |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2840 | struct cfq_queue *__cfqq; |
| 2841 | |
Jeff Moyer | c10b61f | 2010-06-17 10:19:11 -0400 | [diff] [blame] | 2842 | /* |
| 2843 | * If there are no process references on the new_cfqq, then it is |
| 2844 | * unsafe to follow the ->new_cfqq chain as other cfqq's in the |
| 2845 | * chain may have dropped their last reference (not just their |
| 2846 | * last process reference). |
| 2847 | */ |
| 2848 | if (!cfqq_process_refs(new_cfqq)) |
| 2849 | return; |
| 2850 | |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2851 | /* Avoid a circular list and skip interim queue merges */ |
| 2852 | while ((__cfqq = new_cfqq->new_cfqq)) { |
| 2853 | if (__cfqq == cfqq) |
| 2854 | return; |
| 2855 | new_cfqq = __cfqq; |
| 2856 | } |
| 2857 | |
| 2858 | process_refs = cfqq_process_refs(cfqq); |
Jeff Moyer | c10b61f | 2010-06-17 10:19:11 -0400 | [diff] [blame] | 2859 | new_process_refs = cfqq_process_refs(new_cfqq); |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2860 | /* |
| 2861 | * If the process for the cfqq has gone away, there is no |
| 2862 | * sense in merging the queues. |
| 2863 | */ |
Jeff Moyer | c10b61f | 2010-06-17 10:19:11 -0400 | [diff] [blame] | 2864 | if (process_refs == 0 || new_process_refs == 0) |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2865 | return; |
| 2866 | |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2867 | /* |
| 2868 | * Merge in the direction of the lesser amount of work. |
| 2869 | */ |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2870 | if (new_process_refs >= process_refs) { |
| 2871 | cfqq->new_cfqq = new_cfqq; |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 2872 | new_cfqq->ref += process_refs; |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2873 | } else { |
| 2874 | new_cfqq->new_cfqq = cfqq; |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 2875 | cfqq->ref += new_process_refs; |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 2876 | } |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 2877 | } |
| 2878 | |
Vivek Goyal | 6d816ec | 2012-10-03 16:56:59 -0400 | [diff] [blame] | 2879 | static enum wl_type_t cfq_choose_wl_type(struct cfq_data *cfqd, |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 2880 | struct cfq_group *cfqg, enum wl_class_t wl_class) |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2881 | { |
| 2882 | struct cfq_queue *queue; |
| 2883 | int i; |
| 2884 | bool key_valid = false; |
| 2885 | unsigned long lowest_key = 0; |
| 2886 | enum wl_type_t cur_best = SYNC_NOIDLE_WORKLOAD; |
| 2887 | |
Vivek Goyal | 65b32a5 | 2009-12-16 17:52:59 -0500 | [diff] [blame] | 2888 | for (i = 0; i <= SYNC_WORKLOAD; ++i) { |
| 2889 | /* select the one with lowest rb_key */ |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2890 | queue = cfq_rb_first(st_for(cfqg, wl_class, i)); |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2891 | if (queue && |
| 2892 | (!key_valid || time_before(queue->rb_key, lowest_key))) { |
| 2893 | lowest_key = queue->rb_key; |
| 2894 | cur_best = i; |
| 2895 | key_valid = true; |
| 2896 | } |
| 2897 | } |
| 2898 | |
| 2899 | return cur_best; |
| 2900 | } |
| 2901 | |
Vivek Goyal | 6d816ec | 2012-10-03 16:56:59 -0400 | [diff] [blame] | 2902 | static void |
| 2903 | choose_wl_class_and_type(struct cfq_data *cfqd, struct cfq_group *cfqg) |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2904 | { |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2905 | unsigned slice; |
| 2906 | unsigned count; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 2907 | struct cfq_rb_root *st; |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 2908 | unsigned group_slice; |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2909 | enum wl_class_t original_class = cfqd->serving_wl_class; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2910 | |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2911 | /* Choose next priority. RT > BE > IDLE */ |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 2912 | if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg)) |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2913 | cfqd->serving_wl_class = RT_WORKLOAD; |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 2914 | else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg)) |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2915 | cfqd->serving_wl_class = BE_WORKLOAD; |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2916 | else { |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2917 | cfqd->serving_wl_class = IDLE_WORKLOAD; |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2918 | cfqd->workload_expires = jiffies + 1; |
| 2919 | return; |
| 2920 | } |
| 2921 | |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2922 | if (original_class != cfqd->serving_wl_class) |
Shaohua Li writes | e4ea0c1 | 2010-12-13 14:32:22 +0100 | [diff] [blame] | 2923 | goto new_workload; |
| 2924 | |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2925 | /* |
| 2926 | * For RT and BE, we have to choose also the type |
| 2927 | * (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload |
| 2928 | * expiration time |
| 2929 | */ |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2930 | st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 2931 | count = st->count; |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2932 | |
| 2933 | /* |
Vivek Goyal | 65b32a5 | 2009-12-16 17:52:59 -0500 | [diff] [blame] | 2934 | * check workload expiration, and that we still have other queues ready |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2935 | */ |
Vivek Goyal | 65b32a5 | 2009-12-16 17:52:59 -0500 | [diff] [blame] | 2936 | if (count && !time_after(jiffies, cfqd->workload_expires)) |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2937 | return; |
| 2938 | |
Shaohua Li writes | e4ea0c1 | 2010-12-13 14:32:22 +0100 | [diff] [blame] | 2939 | new_workload: |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2940 | /* otherwise select new workload type */ |
Vivek Goyal | 6d816ec | 2012-10-03 16:56:59 -0400 | [diff] [blame] | 2941 | cfqd->serving_wl_type = cfq_choose_wl_type(cfqd, cfqg, |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2942 | cfqd->serving_wl_class); |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 2943 | st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 2944 | count = st->count; |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2945 | |
| 2946 | /* |
| 2947 | * the workload slice is computed as a fraction of target latency |
| 2948 | * proportional to the number of queues in that workload, over |
| 2949 | * all the queues in the same priority class |
| 2950 | */ |
Vivek Goyal | 58ff82f | 2009-12-03 12:59:44 -0500 | [diff] [blame] | 2951 | group_slice = cfq_group_slice(cfqd, cfqg); |
| 2952 | |
| 2953 | slice = group_slice * count / |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2954 | max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_wl_class], |
| 2955 | cfq_group_busy_queues_wl(cfqd->serving_wl_class, cfqd, |
Vivek Goyal | 3bf10fe | 2012-10-03 16:56:56 -0400 | [diff] [blame] | 2956 | cfqg)); |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2957 | |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 2958 | if (cfqd->serving_wl_type == ASYNC_WORKLOAD) { |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 2959 | unsigned int tmp; |
| 2960 | |
| 2961 | /* |
| 2962 | * Async queues are currently system wide. Just taking |
| 2963 | * proportion of queues with-in same group will lead to higher |
| 2964 | * async ratio system wide as generally root group is going |
| 2965 | * to have higher weight. A more accurate thing would be to |
| 2966 | * calculate system wide asnc/sync ratio. |
| 2967 | */ |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 2968 | tmp = cfqd->cfq_target_latency * |
| 2969 | cfqg_busy_async_queues(cfqd, cfqg); |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 2970 | tmp = tmp/cfqd->busy_queues; |
| 2971 | slice = min_t(unsigned, slice, tmp); |
| 2972 | |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2973 | /* async workload slice is scaled down according to |
| 2974 | * the sync/async slice ratio. */ |
| 2975 | slice = slice * cfqd->cfq_slice[0] / cfqd->cfq_slice[1]; |
Vivek Goyal | f26bd1f | 2009-12-03 12:59:54 -0500 | [diff] [blame] | 2976 | } else |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2977 | /* sync workload slice is at least 2 * cfq_slice_idle */ |
| 2978 | slice = max(slice, 2 * cfqd->cfq_slice_idle); |
| 2979 | |
| 2980 | slice = max_t(unsigned, slice, CFQ_MIN_TT); |
Divyesh Shah | b1ffe73 | 2010-03-25 15:45:03 +0100 | [diff] [blame] | 2981 | cfq_log(cfqd, "workload slice:%d", slice); |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 2982 | cfqd->workload_expires = jiffies + slice; |
| 2983 | } |
| 2984 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2985 | static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd) |
| 2986 | { |
| 2987 | struct cfq_rb_root *st = &cfqd->grp_service_tree; |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 2988 | struct cfq_group *cfqg; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2989 | |
| 2990 | if (RB_EMPTY_ROOT(&st->rb)) |
| 2991 | return NULL; |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 2992 | cfqg = cfq_rb_first_group(st); |
Vivek Goyal | 25bc6b0 | 2009-12-03 12:59:43 -0500 | [diff] [blame] | 2993 | update_min_vdisktime(st); |
| 2994 | return cfqg; |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2995 | } |
| 2996 | |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 2997 | static void cfq_choose_cfqg(struct cfq_data *cfqd) |
| 2998 | { |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 2999 | struct cfq_group *cfqg = cfq_get_next_cfqg(cfqd); |
| 3000 | |
| 3001 | cfqd->serving_group = cfqg; |
Vivek Goyal | dae739e | 2009-12-03 12:59:45 -0500 | [diff] [blame] | 3002 | |
| 3003 | /* Restore the workload type data */ |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 3004 | if (cfqg->saved_wl_slice) { |
| 3005 | cfqd->workload_expires = jiffies + cfqg->saved_wl_slice; |
| 3006 | cfqd->serving_wl_type = cfqg->saved_wl_type; |
| 3007 | cfqd->serving_wl_class = cfqg->saved_wl_class; |
Gui Jianfeng | 66ae291 | 2009-12-15 10:08:45 +0100 | [diff] [blame] | 3008 | } else |
| 3009 | cfqd->workload_expires = jiffies - 1; |
| 3010 | |
Vivek Goyal | 6d816ec | 2012-10-03 16:56:59 -0400 | [diff] [blame] | 3011 | choose_wl_class_and_type(cfqd, cfqg); |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 3012 | } |
| 3013 | |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3014 | /* |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 3015 | * Select a queue for service. If we have a current active queue, |
| 3016 | * check whether to continue servicing it, or retrieve and set a new one. |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3017 | */ |
Tejun Heo | 1b5ed5e1 | 2005-11-10 08:49:19 +0100 | [diff] [blame] | 3018 | static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3019 | { |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3020 | struct cfq_queue *cfqq, *new_cfqq = NULL; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3021 | |
| 3022 | cfqq = cfqd->active_queue; |
| 3023 | if (!cfqq) |
| 3024 | goto new_queue; |
| 3025 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 3026 | if (!cfqd->rq_queued) |
| 3027 | return NULL; |
Vivek Goyal | c244bb5 | 2009-12-08 17:52:57 -0500 | [diff] [blame] | 3028 | |
| 3029 | /* |
| 3030 | * We were waiting for group to get backlogged. Expire the queue |
| 3031 | */ |
| 3032 | if (cfq_cfqq_wait_busy(cfqq) && !RB_EMPTY_ROOT(&cfqq->sort_list)) |
| 3033 | goto expire; |
| 3034 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3035 | /* |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3036 | * The active queue has run out of time, expire it and select new. |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3037 | */ |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3038 | if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq)) { |
| 3039 | /* |
| 3040 | * If slice had not expired at the completion of last request |
| 3041 | * we might not have turned on wait_busy flag. Don't expire |
| 3042 | * the queue yet. Allow the group to get backlogged. |
| 3043 | * |
| 3044 | * The very fact that we have used the slice, that means we |
| 3045 | * have been idling all along on this queue and it should be |
| 3046 | * ok to wait for this request to complete. |
| 3047 | */ |
Vivek Goyal | 82bbbf2 | 2009-12-10 19:25:41 +0100 | [diff] [blame] | 3048 | if (cfqq->cfqg->nr_cfqq == 1 && RB_EMPTY_ROOT(&cfqq->sort_list) |
| 3049 | && cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { |
| 3050 | cfqq = NULL; |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3051 | goto keep_queue; |
Vivek Goyal | 82bbbf2 | 2009-12-10 19:25:41 +0100 | [diff] [blame] | 3052 | } else |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 3053 | goto check_group_idle; |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3054 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3055 | |
| 3056 | /* |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3057 | * The active queue has requests and isn't expired, allow it to |
| 3058 | * dispatch. |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3059 | */ |
Jens Axboe | dd67d05 | 2006-06-21 09:36:18 +0200 | [diff] [blame] | 3060 | if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3061 | goto keep_queue; |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3062 | |
| 3063 | /* |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3064 | * If another queue has a request waiting within our mean seek |
| 3065 | * distance, let it run. The expire code will check for close |
| 3066 | * cooperators and put the close queue at the front of the service |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3067 | * tree. If possible, merge the expiring queue with the new cfqq. |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3068 | */ |
Jeff Moyer | b3b6d04 | 2009-10-23 17:14:51 -0400 | [diff] [blame] | 3069 | new_cfqq = cfq_close_cooperator(cfqd, cfqq); |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3070 | if (new_cfqq) { |
| 3071 | if (!cfqq->new_cfqq) |
| 3072 | cfq_setup_merge(cfqq, new_cfqq); |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3073 | goto expire; |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3074 | } |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3075 | |
| 3076 | /* |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3077 | * No requests pending. If the active queue still has requests in |
| 3078 | * flight or is idling for a new request, allow either of these |
| 3079 | * conditions to happen (or time out) before selecting a new queue. |
| 3080 | */ |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 3081 | if (timer_pending(&cfqd->idle_slice_timer)) { |
| 3082 | cfqq = NULL; |
| 3083 | goto keep_queue; |
| 3084 | } |
| 3085 | |
Shaohua Li | 8e1ac66 | 2010-11-08 15:01:04 +0100 | [diff] [blame] | 3086 | /* |
| 3087 | * This is a deep seek queue, but the device is much faster than |
| 3088 | * the queue can deliver, don't idle |
| 3089 | **/ |
| 3090 | if (CFQQ_SEEKY(cfqq) && cfq_cfqq_idle_window(cfqq) && |
| 3091 | (cfq_cfqq_slice_new(cfqq) || |
| 3092 | (cfqq->slice_end - jiffies > jiffies - cfqq->slice_start))) { |
| 3093 | cfq_clear_cfqq_deep(cfqq); |
| 3094 | cfq_clear_cfqq_idle_window(cfqq); |
| 3095 | } |
| 3096 | |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 3097 | if (cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { |
| 3098 | cfqq = NULL; |
| 3099 | goto keep_queue; |
| 3100 | } |
| 3101 | |
| 3102 | /* |
| 3103 | * If group idle is enabled and there are requests dispatched from |
| 3104 | * this group, wait for requests to complete. |
| 3105 | */ |
| 3106 | check_group_idle: |
Shaohua Li | 7700fc4 | 2011-07-12 14:24:56 +0200 | [diff] [blame] | 3107 | if (cfqd->cfq_group_idle && cfqq->cfqg->nr_cfqq == 1 && |
| 3108 | cfqq->cfqg->dispatched && |
| 3109 | !cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) { |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3110 | cfqq = NULL; |
| 3111 | goto keep_queue; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3112 | } |
| 3113 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 3114 | expire: |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 3115 | cfq_slice_expired(cfqd, 0); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 3116 | new_queue: |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 3117 | /* |
| 3118 | * Current queue expired. Check if we have to switch to a new |
| 3119 | * service tree |
| 3120 | */ |
| 3121 | if (!new_cfqq) |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 3122 | cfq_choose_cfqg(cfqd); |
Corrado Zoccolo | 718eee0 | 2009-10-26 22:45:29 +0100 | [diff] [blame] | 3123 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 3124 | cfqq = cfq_set_active_queue(cfqd, new_cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3125 | keep_queue: |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 3126 | return cfqq; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3127 | } |
| 3128 | |
Jens Axboe | febffd6 | 2008-01-28 13:19:43 +0100 | [diff] [blame] | 3129 | static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 3130 | { |
| 3131 | int dispatched = 0; |
| 3132 | |
| 3133 | while (cfqq->next_rq) { |
| 3134 | cfq_dispatch_insert(cfqq->cfqd->queue, cfqq->next_rq); |
| 3135 | dispatched++; |
| 3136 | } |
| 3137 | |
| 3138 | BUG_ON(!list_empty(&cfqq->fifo)); |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 3139 | |
| 3140 | /* By default cfqq is not expired if it is empty. Do it explicitly */ |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 3141 | __cfq_slice_expired(cfqq->cfqd, cfqq, 0); |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 3142 | return dispatched; |
| 3143 | } |
| 3144 | |
Jens Axboe | 498d3aa2 | 2007-04-26 12:54:48 +0200 | [diff] [blame] | 3145 | /* |
| 3146 | * Drain our current requests. Used for barriers and when switching |
| 3147 | * io schedulers on-the-fly. |
| 3148 | */ |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 3149 | static int cfq_forced_dispatch(struct cfq_data *cfqd) |
Tejun Heo | 1b5ed5e1 | 2005-11-10 08:49:19 +0100 | [diff] [blame] | 3150 | { |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 3151 | struct cfq_queue *cfqq; |
Jens Axboe | d9e7620 | 2007-04-20 14:27:50 +0200 | [diff] [blame] | 3152 | int dispatched = 0; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 3153 | |
Divyesh Shah | 3440c49 | 2010-04-09 09:29:57 +0200 | [diff] [blame] | 3154 | /* Expire the timeslice of the current active queue first */ |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 3155 | cfq_slice_expired(cfqd, 0); |
Divyesh Shah | 3440c49 | 2010-04-09 09:29:57 +0200 | [diff] [blame] | 3156 | while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) { |
| 3157 | __cfq_set_active_queue(cfqd, cfqq); |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 3158 | dispatched += __cfq_forced_dispatch_cfqq(cfqq); |
Divyesh Shah | 3440c49 | 2010-04-09 09:29:57 +0200 | [diff] [blame] | 3159 | } |
Tejun Heo | 1b5ed5e1 | 2005-11-10 08:49:19 +0100 | [diff] [blame] | 3160 | |
Tejun Heo | 1b5ed5e1 | 2005-11-10 08:49:19 +0100 | [diff] [blame] | 3161 | BUG_ON(cfqd->busy_queues); |
| 3162 | |
Jeff Moyer | 6923715 | 2009-06-12 15:29:30 +0200 | [diff] [blame] | 3163 | cfq_log(cfqd, "forced_dispatch=%d", dispatched); |
Tejun Heo | 1b5ed5e1 | 2005-11-10 08:49:19 +0100 | [diff] [blame] | 3164 | return dispatched; |
| 3165 | } |
| 3166 | |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3167 | static inline bool cfq_slice_used_soon(struct cfq_data *cfqd, |
| 3168 | struct cfq_queue *cfqq) |
| 3169 | { |
| 3170 | /* the queue hasn't finished any request, can't estimate */ |
| 3171 | if (cfq_cfqq_slice_new(cfqq)) |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 3172 | return true; |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3173 | if (time_after(jiffies + cfqd->cfq_slice_idle * cfqq->dispatched, |
| 3174 | cfqq->slice_end)) |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 3175 | return true; |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3176 | |
Shaohua Li | c1e4475 | 2010-11-08 15:01:02 +0100 | [diff] [blame] | 3177 | return false; |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3178 | } |
| 3179 | |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3180 | static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3181 | { |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3182 | unsigned int max_dispatch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3183 | |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3184 | /* |
Jens Axboe | 5ad531d | 2009-07-03 12:57:48 +0200 | [diff] [blame] | 3185 | * Drain async requests before we start sync IO |
| 3186 | */ |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 3187 | if (cfq_should_idle(cfqd, cfqq) && cfqd->rq_in_flight[BLK_RW_ASYNC]) |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3188 | return false; |
Jens Axboe | 5ad531d | 2009-07-03 12:57:48 +0200 | [diff] [blame] | 3189 | |
| 3190 | /* |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3191 | * If this is an async queue and we have sync IO in flight, let it wait |
| 3192 | */ |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 3193 | if (cfqd->rq_in_flight[BLK_RW_SYNC] && !cfq_cfqq_sync(cfqq)) |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3194 | return false; |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3195 | |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3196 | max_dispatch = max_t(unsigned int, cfqd->cfq_quantum / 2, 1); |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3197 | if (cfq_class_idle(cfqq)) |
| 3198 | max_dispatch = 1; |
| 3199 | |
| 3200 | /* |
| 3201 | * Does this cfqq already have too much IO in flight? |
| 3202 | */ |
| 3203 | if (cfqq->dispatched >= max_dispatch) { |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 3204 | bool promote_sync = false; |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3205 | /* |
| 3206 | * idle queue must always only have a single IO in flight |
| 3207 | */ |
Jens Axboe | 3ed9a29 | 2007-04-23 08:33:33 +0200 | [diff] [blame] | 3208 | if (cfq_class_idle(cfqq)) |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3209 | return false; |
Jens Axboe | 3ed9a29 | 2007-04-23 08:33:33 +0200 | [diff] [blame] | 3210 | |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3211 | /* |
Li, Shaohua | c4ade94 | 2011-03-23 08:30:34 +0100 | [diff] [blame] | 3212 | * If there is only one sync queue |
| 3213 | * we can ignore async queue here and give the sync |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 3214 | * queue no dispatch limit. The reason is a sync queue can |
| 3215 | * preempt async queue, limiting the sync queue doesn't make |
| 3216 | * sense. This is useful for aiostress test. |
| 3217 | */ |
Li, Shaohua | c4ade94 | 2011-03-23 08:30:34 +0100 | [diff] [blame] | 3218 | if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) |
| 3219 | promote_sync = true; |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 3220 | |
| 3221 | /* |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3222 | * We have other queues, don't allow more IO from this one |
| 3223 | */ |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 3224 | if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && |
| 3225 | !promote_sync) |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3226 | return false; |
Jens Axboe | 9ede209 | 2007-01-19 12:11:44 +1100 | [diff] [blame] | 3227 | |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3228 | /* |
Shaohua Li | 474b18c | 2009-12-03 12:58:05 +0100 | [diff] [blame] | 3229 | * Sole queue user, no limit |
Vivek Goyal | 365722b | 2009-10-03 15:21:27 +0200 | [diff] [blame] | 3230 | */ |
Shaohua Li | ef8a41d | 2011-03-07 09:26:29 +0100 | [diff] [blame] | 3231 | if (cfqd->busy_queues == 1 || promote_sync) |
Shaohua Li | abc3c74 | 2010-03-01 09:20:54 +0100 | [diff] [blame] | 3232 | max_dispatch = -1; |
| 3233 | else |
| 3234 | /* |
| 3235 | * Normally we start throttling cfqq when cfq_quantum/2 |
| 3236 | * requests have been dispatched. But we can drive |
| 3237 | * deeper queue depths at the beginning of slice |
| 3238 | * subjected to upper limit of cfq_quantum. |
| 3239 | * */ |
| 3240 | max_dispatch = cfqd->cfq_quantum; |
Jens Axboe | 8e29675 | 2009-10-03 16:26:03 +0200 | [diff] [blame] | 3241 | } |
| 3242 | |
| 3243 | /* |
| 3244 | * Async queues must wait a bit before being allowed dispatch. |
| 3245 | * We also ramp up the dispatch depth gradually for async IO, |
| 3246 | * based on the last sync IO we serviced |
| 3247 | */ |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 3248 | if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) { |
Corrado Zoccolo | 573412b | 2009-12-06 11:48:52 +0100 | [diff] [blame] | 3249 | unsigned long last_sync = jiffies - cfqd->last_delayed_sync; |
Jens Axboe | 8e29675 | 2009-10-03 16:26:03 +0200 | [diff] [blame] | 3250 | unsigned int depth; |
Vivek Goyal | 365722b | 2009-10-03 15:21:27 +0200 | [diff] [blame] | 3251 | |
Jens Axboe | 61f0c1d | 2009-10-03 19:46:03 +0200 | [diff] [blame] | 3252 | depth = last_sync / cfqd->cfq_slice[1]; |
Jens Axboe | e00c54c | 2009-10-04 20:36:19 +0200 | [diff] [blame] | 3253 | if (!depth && !cfqq->dispatched) |
| 3254 | depth = 1; |
Jens Axboe | 8e29675 | 2009-10-03 16:26:03 +0200 | [diff] [blame] | 3255 | if (depth < max_dispatch) |
| 3256 | max_dispatch = depth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3257 | } |
| 3258 | |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3259 | /* |
| 3260 | * If we're below the current max, allow a dispatch |
| 3261 | */ |
| 3262 | return cfqq->dispatched < max_dispatch; |
| 3263 | } |
| 3264 | |
| 3265 | /* |
| 3266 | * Dispatch a request from cfqq, moving them to the request queue |
| 3267 | * dispatch list. |
| 3268 | */ |
| 3269 | static bool cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 3270 | { |
| 3271 | struct request *rq; |
| 3272 | |
| 3273 | BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list)); |
| 3274 | |
| 3275 | if (!cfq_may_dispatch(cfqd, cfqq)) |
| 3276 | return false; |
| 3277 | |
| 3278 | /* |
| 3279 | * follow expired path, else get first next available |
| 3280 | */ |
| 3281 | rq = cfq_check_fifo(cfqq); |
| 3282 | if (!rq) |
| 3283 | rq = cfqq->next_rq; |
| 3284 | |
| 3285 | /* |
| 3286 | * insert request into driver dispatch list |
| 3287 | */ |
| 3288 | cfq_dispatch_insert(cfqd->queue, rq); |
| 3289 | |
| 3290 | if (!cfqd->active_cic) { |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3291 | struct cfq_io_cq *cic = RQ_CIC(rq); |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3292 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3293 | atomic_long_inc(&cic->icq.ioc->refcount); |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3294 | cfqd->active_cic = cic; |
| 3295 | } |
| 3296 | |
| 3297 | return true; |
| 3298 | } |
| 3299 | |
| 3300 | /* |
| 3301 | * Find the cfqq that we need to service and move a request from that to the |
| 3302 | * dispatch list |
| 3303 | */ |
| 3304 | static int cfq_dispatch_requests(struct request_queue *q, int force) |
| 3305 | { |
| 3306 | struct cfq_data *cfqd = q->elevator->elevator_data; |
| 3307 | struct cfq_queue *cfqq; |
| 3308 | |
| 3309 | if (!cfqd->busy_queues) |
| 3310 | return 0; |
| 3311 | |
| 3312 | if (unlikely(force)) |
| 3313 | return cfq_forced_dispatch(cfqd); |
| 3314 | |
| 3315 | cfqq = cfq_select_queue(cfqd); |
| 3316 | if (!cfqq) |
Jens Axboe | 8e29675 | 2009-10-03 16:26:03 +0200 | [diff] [blame] | 3317 | return 0; |
| 3318 | |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3319 | /* |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3320 | * Dispatch a request from this cfqq, if it is allowed |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3321 | */ |
Jens Axboe | 0b182d6 | 2009-10-06 20:49:37 +0200 | [diff] [blame] | 3322 | if (!cfq_dispatch_request(cfqd, cfqq)) |
| 3323 | return 0; |
| 3324 | |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3325 | cfqq->slice_dispatch++; |
Jens Axboe | b029195 | 2009-04-07 11:38:31 +0200 | [diff] [blame] | 3326 | cfq_clear_cfqq_must_dispatch(cfqq); |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3327 | |
| 3328 | /* |
| 3329 | * expire an async queue immediately if it has used up its slice. idle |
| 3330 | * queue always expire after 1 dispatch round. |
| 3331 | */ |
| 3332 | if (cfqd->busy_queues > 1 && ((!cfq_cfqq_sync(cfqq) && |
| 3333 | cfqq->slice_dispatch >= cfq_prio_to_maxrq(cfqd, cfqq)) || |
| 3334 | cfq_class_idle(cfqq))) { |
| 3335 | cfqq->slice_end = jiffies + 1; |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 3336 | cfq_slice_expired(cfqd, 0); |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3337 | } |
| 3338 | |
Shan Wei | b217a90 | 2009-09-01 10:06:42 +0200 | [diff] [blame] | 3339 | cfq_log_cfqq(cfqd, cfqq, "dispatched a request"); |
Jens Axboe | 2f5cb73 | 2009-04-07 08:51:19 +0200 | [diff] [blame] | 3340 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3341 | } |
| 3342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3343 | /* |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3344 | * task holds one reference to the queue, dropped when task exits. each rq |
| 3345 | * in-flight on this queue also holds a reference, dropped when rq is freed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3346 | * |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 3347 | * Each cfq queue took a reference on the parent group. Drop it now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3348 | * queue lock must be held here. |
| 3349 | */ |
| 3350 | static void cfq_put_queue(struct cfq_queue *cfqq) |
| 3351 | { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3352 | struct cfq_data *cfqd = cfqq->cfqd; |
Justin TerAvest | 0bbfeb8 | 2011-03-01 15:05:08 -0500 | [diff] [blame] | 3353 | struct cfq_group *cfqg; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3354 | |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 3355 | BUG_ON(cfqq->ref <= 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3356 | |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 3357 | cfqq->ref--; |
| 3358 | if (cfqq->ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3359 | return; |
| 3360 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 3361 | cfq_log_cfqq(cfqd, cfqq, "put_queue"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3362 | BUG_ON(rb_first(&cfqq->sort_list)); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3363 | BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 3364 | cfqg = cfqq->cfqg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3365 | |
Jens Axboe | 28f95cbc | 2007-01-19 12:09:53 +1100 | [diff] [blame] | 3366 | if (unlikely(cfqd->active_queue == cfqq)) { |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 3367 | __cfq_slice_expired(cfqd, cfqq, 0); |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 3368 | cfq_schedule_dispatch(cfqd); |
Jens Axboe | 28f95cbc | 2007-01-19 12:09:53 +1100 | [diff] [blame] | 3369 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3370 | |
Vivek Goyal | f04a642 | 2009-12-03 12:59:40 -0500 | [diff] [blame] | 3371 | BUG_ON(cfq_cfqq_on_rr(cfqq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | kmem_cache_free(cfq_pool, cfqq); |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 3373 | cfqg_put(cfqg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3374 | } |
| 3375 | |
Shaohua Li | d02a2c0 | 2010-05-25 10:16:53 +0200 | [diff] [blame] | 3376 | static void cfq_put_cooperator(struct cfq_queue *cfqq) |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3377 | { |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3378 | struct cfq_queue *__cfqq, *next; |
| 3379 | |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3380 | /* |
| 3381 | * If this queue was scheduled to merge with another queue, be |
| 3382 | * sure to drop the reference taken on that queue (and others in |
| 3383 | * the merge chain). See cfq_setup_merge and cfq_merge_cfqqs. |
| 3384 | */ |
| 3385 | __cfqq = cfqq->new_cfqq; |
| 3386 | while (__cfqq) { |
| 3387 | if (__cfqq == cfqq) { |
| 3388 | WARN(1, "cfqq->new_cfqq loop detected\n"); |
| 3389 | break; |
| 3390 | } |
| 3391 | next = __cfqq->new_cfqq; |
| 3392 | cfq_put_queue(__cfqq); |
| 3393 | __cfqq = next; |
| 3394 | } |
Shaohua Li | d02a2c0 | 2010-05-25 10:16:53 +0200 | [diff] [blame] | 3395 | } |
| 3396 | |
| 3397 | static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 3398 | { |
| 3399 | if (unlikely(cfqq == cfqd->active_queue)) { |
| 3400 | __cfq_slice_expired(cfqd, cfqq, 0); |
| 3401 | cfq_schedule_dispatch(cfqd); |
| 3402 | } |
| 3403 | |
| 3404 | cfq_put_cooperator(cfqq); |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 3405 | |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3406 | cfq_put_queue(cfqq); |
| 3407 | } |
| 3408 | |
Tejun Heo | 9b84cac | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 3409 | static void cfq_init_icq(struct io_cq *icq) |
| 3410 | { |
| 3411 | struct cfq_io_cq *cic = icq_to_cic(icq); |
| 3412 | |
| 3413 | cic->ttime.last_end_request = jiffies; |
| 3414 | } |
| 3415 | |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3416 | static void cfq_exit_icq(struct io_cq *icq) |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3417 | { |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3418 | struct cfq_io_cq *cic = icq_to_cic(icq); |
Tejun Heo | 283287a | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 3419 | struct cfq_data *cfqd = cic_to_cfqd(cic); |
Fabio Checconi | 4faa3c8 | 2008-04-10 08:28:01 +0200 | [diff] [blame] | 3420 | |
Jens Axboe | ff6657c | 2009-04-08 10:58:57 +0200 | [diff] [blame] | 3421 | if (cic->cfqq[BLK_RW_ASYNC]) { |
| 3422 | cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]); |
| 3423 | cic->cfqq[BLK_RW_ASYNC] = NULL; |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3424 | } |
| 3425 | |
Jens Axboe | ff6657c | 2009-04-08 10:58:57 +0200 | [diff] [blame] | 3426 | if (cic->cfqq[BLK_RW_SYNC]) { |
| 3427 | cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_SYNC]); |
| 3428 | cic->cfqq[BLK_RW_SYNC] = NULL; |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3429 | } |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 3430 | } |
| 3431 | |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3432 | static void cfq_init_prio_data(struct cfq_queue *cfqq, struct cfq_io_cq *cic) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3433 | { |
| 3434 | struct task_struct *tsk = current; |
| 3435 | int ioprio_class; |
| 3436 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 3437 | if (!cfq_cfqq_prio_changed(cfqq)) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3438 | return; |
| 3439 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3440 | ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3441 | switch (ioprio_class) { |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3442 | default: |
| 3443 | printk(KERN_ERR "cfq: bad prio %x\n", ioprio_class); |
| 3444 | case IOPRIO_CLASS_NONE: |
| 3445 | /* |
Jens Axboe | 6d63c27 | 2008-05-07 09:51:23 +0200 | [diff] [blame] | 3446 | * no prio set, inherit CPU scheduling settings |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3447 | */ |
| 3448 | cfqq->ioprio = task_nice_ioprio(tsk); |
Jens Axboe | 6d63c27 | 2008-05-07 09:51:23 +0200 | [diff] [blame] | 3449 | cfqq->ioprio_class = task_nice_ioclass(tsk); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3450 | break; |
| 3451 | case IOPRIO_CLASS_RT: |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3452 | cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3453 | cfqq->ioprio_class = IOPRIO_CLASS_RT; |
| 3454 | break; |
| 3455 | case IOPRIO_CLASS_BE: |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3456 | cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3457 | cfqq->ioprio_class = IOPRIO_CLASS_BE; |
| 3458 | break; |
| 3459 | case IOPRIO_CLASS_IDLE: |
| 3460 | cfqq->ioprio_class = IOPRIO_CLASS_IDLE; |
| 3461 | cfqq->ioprio = 7; |
| 3462 | cfq_clear_cfqq_idle_window(cfqq); |
| 3463 | break; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3464 | } |
| 3465 | |
| 3466 | /* |
| 3467 | * keep track of original prio settings in case we have to temporarily |
| 3468 | * elevate the priority of this queue |
| 3469 | */ |
| 3470 | cfqq->org_ioprio = cfqq->ioprio; |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 3471 | cfq_clear_cfqq_prio_changed(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3472 | } |
| 3473 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3474 | static void check_ioprio_changed(struct cfq_io_cq *cic, struct bio *bio) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3475 | { |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3476 | int ioprio = cic->icq.ioc->ioprio; |
Konstantin Khlebnikov | bca4b91 | 2010-05-20 23:21:34 +0400 | [diff] [blame] | 3477 | struct cfq_data *cfqd = cic_to_cfqd(cic); |
Al Viro | 478a82b | 2006-03-18 13:25:24 -0500 | [diff] [blame] | 3478 | struct cfq_queue *cfqq; |
Jens Axboe | 35e6077 | 2006-06-14 09:10:45 +0200 | [diff] [blame] | 3479 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3480 | /* |
| 3481 | * Check whether ioprio has changed. The condition may trigger |
| 3482 | * spuriously on a newly created cic but there's no harm. |
| 3483 | */ |
| 3484 | if (unlikely(!cfqd) || likely(cic->ioprio == ioprio)) |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3485 | return; |
| 3486 | |
Jens Axboe | ff6657c | 2009-04-08 10:58:57 +0200 | [diff] [blame] | 3487 | cfqq = cic->cfqq[BLK_RW_ASYNC]; |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3488 | if (cfqq) { |
| 3489 | struct cfq_queue *new_cfqq; |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3490 | new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic, bio, |
| 3491 | GFP_ATOMIC); |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3492 | if (new_cfqq) { |
Jens Axboe | ff6657c | 2009-04-08 10:58:57 +0200 | [diff] [blame] | 3493 | cic->cfqq[BLK_RW_ASYNC] = new_cfqq; |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3494 | cfq_put_queue(cfqq); |
| 3495 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3496 | } |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3497 | |
Jens Axboe | ff6657c | 2009-04-08 10:58:57 +0200 | [diff] [blame] | 3498 | cfqq = cic->cfqq[BLK_RW_SYNC]; |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 3499 | if (cfqq) |
| 3500 | cfq_mark_cfqq_prio_changed(cfqq); |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3501 | |
| 3502 | cic->ioprio = ioprio; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3503 | } |
| 3504 | |
Jens Axboe | d5036d7 | 2009-06-26 10:44:34 +0200 | [diff] [blame] | 3505 | static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3506 | pid_t pid, bool is_sync) |
Jens Axboe | d5036d7 | 2009-06-26 10:44:34 +0200 | [diff] [blame] | 3507 | { |
| 3508 | RB_CLEAR_NODE(&cfqq->rb_node); |
| 3509 | RB_CLEAR_NODE(&cfqq->p_node); |
| 3510 | INIT_LIST_HEAD(&cfqq->fifo); |
| 3511 | |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 3512 | cfqq->ref = 0; |
Jens Axboe | d5036d7 | 2009-06-26 10:44:34 +0200 | [diff] [blame] | 3513 | cfqq->cfqd = cfqd; |
| 3514 | |
| 3515 | cfq_mark_cfqq_prio_changed(cfqq); |
| 3516 | |
| 3517 | if (is_sync) { |
| 3518 | if (!cfq_class_idle(cfqq)) |
| 3519 | cfq_mark_cfqq_idle_window(cfqq); |
| 3520 | cfq_mark_cfqq_sync(cfqq); |
| 3521 | } |
| 3522 | cfqq->pid = pid; |
| 3523 | } |
| 3524 | |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3525 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3526 | static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3527 | { |
Konstantin Khlebnikov | bca4b91 | 2010-05-20 23:21:34 +0400 | [diff] [blame] | 3528 | struct cfq_data *cfqd = cic_to_cfqd(cic); |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3529 | struct cfq_queue *sync_cfqq; |
| 3530 | uint64_t id; |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3531 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3532 | rcu_read_lock(); |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 3533 | id = bio_blkcg(bio)->id; |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3534 | rcu_read_unlock(); |
| 3535 | |
| 3536 | /* |
| 3537 | * Check whether blkcg has changed. The condition may trigger |
| 3538 | * spuriously on a newly created cic but there's no harm. |
| 3539 | */ |
| 3540 | if (unlikely(!cfqd) || likely(cic->blkcg_id == id)) |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3541 | return; |
| 3542 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3543 | sync_cfqq = cic_to_cfqq(cic, 1); |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3544 | if (sync_cfqq) { |
| 3545 | /* |
| 3546 | * Drop reference to sync queue. A new sync queue will be |
| 3547 | * assigned in new group upon arrival of a fresh request. |
| 3548 | */ |
| 3549 | cfq_log_cfqq(cfqd, sync_cfqq, "changed cgroup"); |
| 3550 | cic_set_cfqq(cic, NULL, 1); |
| 3551 | cfq_put_queue(sync_cfqq); |
| 3552 | } |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3553 | |
| 3554 | cic->blkcg_id = id; |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3555 | } |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3556 | #else |
| 3557 | static inline void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) { } |
Vivek Goyal | 24610333 | 2009-12-03 12:59:51 -0500 | [diff] [blame] | 3558 | #endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
| 3559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3560 | static struct cfq_queue * |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3561 | cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic, |
| 3562 | struct bio *bio, gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | { |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 3564 | struct blkcg *blkcg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3565 | struct cfq_queue *cfqq, *new_cfqq = NULL; |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 3566 | struct cfq_group *cfqg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3567 | |
| 3568 | retry: |
Tejun Heo | 2a7f124 | 2012-03-05 13:15:01 -0800 | [diff] [blame] | 3569 | rcu_read_lock(); |
| 3570 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 3571 | blkcg = bio_blkcg(bio); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 3572 | cfqg = cfq_lookup_create_cfqg(cfqd, blkcg); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 3573 | cfqq = cic_to_cfqq(cic, is_sync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3574 | |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3575 | /* |
| 3576 | * Always try a new alloc if we fell back to the OOM cfqq |
| 3577 | * originally, since it should just be a temporary situation. |
| 3578 | */ |
| 3579 | if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
| 3580 | cfqq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3581 | if (new_cfqq) { |
| 3582 | cfqq = new_cfqq; |
| 3583 | new_cfqq = NULL; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3584 | } else if (gfp_mask & __GFP_WAIT) { |
Tejun Heo | 2a7f124 | 2012-03-05 13:15:01 -0800 | [diff] [blame] | 3585 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3586 | spin_unlock_irq(cfqd->queue->queue_lock); |
Christoph Lameter | 94f6030 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 3587 | new_cfqq = kmem_cache_alloc_node(cfq_pool, |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3588 | gfp_mask | __GFP_ZERO, |
Christoph Lameter | 94f6030 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 3589 | cfqd->queue->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3590 | spin_lock_irq(cfqd->queue->queue_lock); |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3591 | if (new_cfqq) |
| 3592 | goto retry; |
Glauber Costa | a3cc86c | 2013-02-21 15:16:41 -0800 | [diff] [blame] | 3593 | else |
| 3594 | return &cfqd->oom_cfqq; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3595 | } else { |
Christoph Lameter | 94f6030 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 3596 | cfqq = kmem_cache_alloc_node(cfq_pool, |
| 3597 | gfp_mask | __GFP_ZERO, |
| 3598 | cfqd->queue->node); |
Kiyoshi Ueda | db3b584 | 2005-06-17 16:15:10 +0200 | [diff] [blame] | 3599 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3600 | |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3601 | if (cfqq) { |
| 3602 | cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync); |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3603 | cfq_init_prio_data(cfqq, cic); |
Vivek Goyal | cdb16e8 | 2009-12-03 12:59:38 -0500 | [diff] [blame] | 3604 | cfq_link_cfqq_cfqg(cfqq, cfqg); |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3605 | cfq_log_cfqq(cfqd, cfqq, "alloced"); |
| 3606 | } else |
| 3607 | cfqq = &cfqd->oom_cfqq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3608 | } |
| 3609 | |
| 3610 | if (new_cfqq) |
| 3611 | kmem_cache_free(cfq_pool, new_cfqq); |
| 3612 | |
Tejun Heo | 2a7f124 | 2012-03-05 13:15:01 -0800 | [diff] [blame] | 3613 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3614 | return cfqq; |
| 3615 | } |
| 3616 | |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3617 | static struct cfq_queue ** |
| 3618 | cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) |
| 3619 | { |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 3620 | switch (ioprio_class) { |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3621 | case IOPRIO_CLASS_RT: |
| 3622 | return &cfqd->async_cfqq[0][ioprio]; |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3623 | case IOPRIO_CLASS_NONE: |
| 3624 | ioprio = IOPRIO_NORM; |
| 3625 | /* fall through */ |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3626 | case IOPRIO_CLASS_BE: |
| 3627 | return &cfqd->async_cfqq[1][ioprio]; |
| 3628 | case IOPRIO_CLASS_IDLE: |
| 3629 | return &cfqd->async_idle_cfqq; |
| 3630 | default: |
| 3631 | BUG(); |
| 3632 | } |
| 3633 | } |
| 3634 | |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3635 | static struct cfq_queue * |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3636 | cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic, |
Tejun Heo | 4f85cb9 | 2012-03-05 13:15:28 -0800 | [diff] [blame] | 3637 | struct bio *bio, gfp_t gfp_mask) |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3638 | { |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 3639 | const int ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); |
| 3640 | const int ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3641 | struct cfq_queue **async_cfqq = NULL; |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3642 | struct cfq_queue *cfqq = NULL; |
| 3643 | |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3644 | if (!is_sync) { |
| 3645 | async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio); |
| 3646 | cfqq = *async_cfqq; |
| 3647 | } |
| 3648 | |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 3649 | if (!cfqq) |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3650 | cfqq = cfq_find_alloc_queue(cfqd, is_sync, cic, bio, gfp_mask); |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3651 | |
| 3652 | /* |
| 3653 | * pin the queue now that it's allocated, scheduler exit will prune it |
| 3654 | */ |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3655 | if (!is_sync && !(*async_cfqq)) { |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 3656 | cfqq->ref++; |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 3657 | *async_cfqq = cfqq; |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3658 | } |
| 3659 | |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 3660 | cfqq->ref++; |
Jens Axboe | 15c31be | 2007-07-10 13:43:25 +0200 | [diff] [blame] | 3661 | return cfqq; |
| 3662 | } |
| 3663 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3664 | static void |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3665 | __cfq_update_io_thinktime(struct cfq_ttime *ttime, unsigned long slice_idle) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3666 | { |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3667 | unsigned long elapsed = jiffies - ttime->last_end_request; |
| 3668 | elapsed = min(elapsed, 2UL * slice_idle); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3669 | |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3670 | ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8; |
| 3671 | ttime->ttime_total = (7*ttime->ttime_total + 256*elapsed) / 8; |
| 3672 | ttime->ttime_mean = (ttime->ttime_total + 128) / ttime->ttime_samples; |
| 3673 | } |
| 3674 | |
| 3675 | static void |
| 3676 | cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3677 | struct cfq_io_cq *cic) |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3678 | { |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 3679 | if (cfq_cfqq_sync(cfqq)) { |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3680 | __cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle); |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 3681 | __cfq_update_io_thinktime(&cfqq->service_tree->ttime, |
| 3682 | cfqd->cfq_slice_idle); |
| 3683 | } |
Shaohua Li | 7700fc4 | 2011-07-12 14:24:56 +0200 | [diff] [blame] | 3684 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 3685 | __cfq_update_io_thinktime(&cfqq->cfqg->ttime, cfqd->cfq_group_idle); |
| 3686 | #endif |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3687 | } |
| 3688 | |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 3689 | static void |
Jeff Moyer | b2c18e1 | 2009-10-23 17:14:49 -0400 | [diff] [blame] | 3690 | cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3691 | struct request *rq) |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 3692 | { |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 3693 | sector_t sdist = 0; |
Corrado Zoccolo | 41647e7 | 2010-02-27 19:45:40 +0100 | [diff] [blame] | 3694 | sector_t n_sec = blk_rq_sectors(rq); |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 3695 | if (cfqq->last_request_pos) { |
| 3696 | if (cfqq->last_request_pos < blk_rq_pos(rq)) |
| 3697 | sdist = blk_rq_pos(rq) - cfqq->last_request_pos; |
| 3698 | else |
| 3699 | sdist = cfqq->last_request_pos - blk_rq_pos(rq); |
| 3700 | } |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 3701 | |
Corrado Zoccolo | 3dde36d | 2010-02-27 19:45:39 +0100 | [diff] [blame] | 3702 | cfqq->seek_history <<= 1; |
Corrado Zoccolo | 41647e7 | 2010-02-27 19:45:40 +0100 | [diff] [blame] | 3703 | if (blk_queue_nonrot(cfqd->queue)) |
| 3704 | cfqq->seek_history |= (n_sec < CFQQ_SECT_THR_NONROT); |
| 3705 | else |
| 3706 | cfqq->seek_history |= (sdist > CFQQ_SEEK_THR); |
Jens Axboe | 206dc69 | 2006-03-28 13:03:44 +0200 | [diff] [blame] | 3707 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3708 | |
| 3709 | /* |
| 3710 | * Disable idle window if the process thinks too long or seeks so much that |
| 3711 | * it doesn't matter |
| 3712 | */ |
| 3713 | static void |
| 3714 | cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3715 | struct cfq_io_cq *cic) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3716 | { |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 3717 | int old_idle, enable_idle; |
Jens Axboe | 1be92f2 | 2007-04-19 14:32:26 +0200 | [diff] [blame] | 3718 | |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 3719 | /* |
| 3720 | * Don't idle for async or idle io prio class |
| 3721 | */ |
| 3722 | if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) |
Jens Axboe | 1be92f2 | 2007-04-19 14:32:26 +0200 | [diff] [blame] | 3723 | return; |
| 3724 | |
Jens Axboe | c265a7f | 2008-06-26 13:49:33 +0200 | [diff] [blame] | 3725 | enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3726 | |
Corrado Zoccolo | 76280af | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 3727 | if (cfqq->queued[0] + cfqq->queued[1] >= 4) |
| 3728 | cfq_mark_cfqq_deep(cfqq); |
| 3729 | |
Corrado Zoccolo | 749ef9f | 2010-09-20 15:24:50 +0200 | [diff] [blame] | 3730 | if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE)) |
| 3731 | enable_idle = 0; |
Tejun Heo | f6e8d01 | 2012-03-05 13:15:26 -0800 | [diff] [blame] | 3732 | else if (!atomic_read(&cic->icq.ioc->active_ref) || |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3733 | !cfqd->cfq_slice_idle || |
| 3734 | (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3735 | enable_idle = 0; |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3736 | else if (sample_valid(cic->ttime.ttime_samples)) { |
| 3737 | if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3738 | enable_idle = 0; |
| 3739 | else |
| 3740 | enable_idle = 1; |
| 3741 | } |
| 3742 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 3743 | if (old_idle != enable_idle) { |
| 3744 | cfq_log_cfqq(cfqd, cfqq, "idle=%d", enable_idle); |
| 3745 | if (enable_idle) |
| 3746 | cfq_mark_cfqq_idle_window(cfqq); |
| 3747 | else |
| 3748 | cfq_clear_cfqq_idle_window(cfqq); |
| 3749 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3750 | } |
| 3751 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3752 | /* |
| 3753 | * Check if new_cfqq should preempt the currently active queue. Return 0 for |
| 3754 | * no or if we aren't sure, a 1 will cause a preempt. |
| 3755 | */ |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3756 | static bool |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3757 | cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3758 | struct request *rq) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3759 | { |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3760 | struct cfq_queue *cfqq; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3761 | |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3762 | cfqq = cfqd->active_queue; |
| 3763 | if (!cfqq) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3764 | return false; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3765 | |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 3766 | if (cfq_class_idle(new_cfqq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3767 | return false; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3768 | |
| 3769 | if (cfq_class_idle(cfqq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3770 | return true; |
Jens Axboe | 1e3335d | 2007-02-14 19:59:49 +0100 | [diff] [blame] | 3771 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3772 | /* |
Divyesh Shah | 875feb6 | 2010-01-06 18:58:20 -0800 | [diff] [blame] | 3773 | * Don't allow a non-RT request to preempt an ongoing RT cfqq timeslice. |
| 3774 | */ |
| 3775 | if (cfq_class_rt(cfqq) && !cfq_class_rt(new_cfqq)) |
| 3776 | return false; |
| 3777 | |
| 3778 | /* |
Jens Axboe | 374f84a | 2006-07-23 01:42:19 +0200 | [diff] [blame] | 3779 | * if the new request is sync, but the currently running queue is |
| 3780 | * not, let the sync request have priority. |
| 3781 | */ |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3782 | if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3783 | return true; |
Jens Axboe | 1e3335d | 2007-02-14 19:59:49 +0100 | [diff] [blame] | 3784 | |
Vivek Goyal | 8682e1f | 2009-12-03 12:59:50 -0500 | [diff] [blame] | 3785 | if (new_cfqq->cfqg != cfqq->cfqg) |
| 3786 | return false; |
| 3787 | |
| 3788 | if (cfq_slice_used(cfqq)) |
| 3789 | return true; |
| 3790 | |
| 3791 | /* Allow preemption only if we are idling on sync-noidle tree */ |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 3792 | if (cfqd->serving_wl_type == SYNC_NOIDLE_WORKLOAD && |
Vivek Goyal | 8682e1f | 2009-12-03 12:59:50 -0500 | [diff] [blame] | 3793 | cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD && |
| 3794 | new_cfqq->service_tree->count == 2 && |
| 3795 | RB_EMPTY_ROOT(&cfqq->sort_list)) |
| 3796 | return true; |
| 3797 | |
Jens Axboe | 374f84a | 2006-07-23 01:42:19 +0200 | [diff] [blame] | 3798 | /* |
Jens Axboe | b53d1ed | 2011-08-19 08:34:48 +0200 | [diff] [blame] | 3799 | * So both queues are sync. Let the new request get disk time if |
| 3800 | * it's a metadata request and the current queue is doing regular IO. |
| 3801 | */ |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 3802 | if ((rq->cmd_flags & REQ_PRIO) && !cfqq->prio_pending) |
Jens Axboe | b53d1ed | 2011-08-19 08:34:48 +0200 | [diff] [blame] | 3803 | return true; |
| 3804 | |
| 3805 | /* |
Divyesh Shah | 3a9a3f6 | 2009-01-30 12:46:41 +0100 | [diff] [blame] | 3806 | * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice. |
| 3807 | */ |
| 3808 | if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3809 | return true; |
Divyesh Shah | 3a9a3f6 | 2009-01-30 12:46:41 +0100 | [diff] [blame] | 3810 | |
Shaohua Li | d2d59e1 | 2010-11-08 15:01:03 +0100 | [diff] [blame] | 3811 | /* An idle queue should not be idle now for some reason */ |
| 3812 | if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq)) |
| 3813 | return true; |
| 3814 | |
Jens Axboe | 1e3335d | 2007-02-14 19:59:49 +0100 | [diff] [blame] | 3815 | if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3816 | return false; |
Jens Axboe | 1e3335d | 2007-02-14 19:59:49 +0100 | [diff] [blame] | 3817 | |
| 3818 | /* |
| 3819 | * if this request is as-good as one we would expect from the |
| 3820 | * current cfqq, let it preempt |
| 3821 | */ |
Shaohua Li | e9ce335 | 2010-03-19 08:03:04 +0100 | [diff] [blame] | 3822 | if (cfq_rq_close(cfqd, cfqq, rq)) |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3823 | return true; |
Jens Axboe | 1e3335d | 2007-02-14 19:59:49 +0100 | [diff] [blame] | 3824 | |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 3825 | return false; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3826 | } |
| 3827 | |
| 3828 | /* |
| 3829 | * cfqq preempts the active queue. if we allowed preempt with no slice left, |
| 3830 | * let it have half of its nominal slice. |
| 3831 | */ |
| 3832 | static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 3833 | { |
Shaohua Li | df0793a | 2012-01-19 09:20:09 +0100 | [diff] [blame] | 3834 | enum wl_type_t old_type = cfqq_type(cfqd->active_queue); |
| 3835 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 3836 | cfq_log_cfqq(cfqd, cfqq, "preempt"); |
Shaohua Li | df0793a | 2012-01-19 09:20:09 +0100 | [diff] [blame] | 3837 | cfq_slice_expired(cfqd, 1); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3838 | |
Jens Axboe | bf57225 | 2006-07-19 20:29:12 +0200 | [diff] [blame] | 3839 | /* |
Shaohua Li | f8ae6e3 | 2011-01-14 08:41:02 +0100 | [diff] [blame] | 3840 | * workload type is changed, don't save slice, otherwise preempt |
| 3841 | * doesn't happen |
| 3842 | */ |
Shaohua Li | df0793a | 2012-01-19 09:20:09 +0100 | [diff] [blame] | 3843 | if (old_type != cfqq_type(cfqq)) |
Vivek Goyal | 4d2ceea | 2012-10-03 16:56:57 -0400 | [diff] [blame] | 3844 | cfqq->cfqg->saved_wl_slice = 0; |
Shaohua Li | f8ae6e3 | 2011-01-14 08:41:02 +0100 | [diff] [blame] | 3845 | |
| 3846 | /* |
Jens Axboe | bf57225 | 2006-07-19 20:29:12 +0200 | [diff] [blame] | 3847 | * Put the new queue at the front of the of the current list, |
| 3848 | * so we know that it will be selected next. |
| 3849 | */ |
| 3850 | BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
Jens Axboe | edd75ff | 2007-04-19 12:03:34 +0200 | [diff] [blame] | 3851 | |
| 3852 | cfq_service_tree_add(cfqd, cfqq, 1); |
Justin TerAvest | eda5e0c | 2011-03-22 21:26:49 +0100 | [diff] [blame] | 3853 | |
Justin TerAvest | 62a37f6 | 2011-03-23 08:25:44 +0100 | [diff] [blame] | 3854 | cfqq->slice_end = 0; |
| 3855 | cfq_mark_cfqq_slice_new(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3856 | } |
| 3857 | |
| 3858 | /* |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3859 | * Called when a new fs request (rq) is added (to cfqq). Check if there's |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3860 | * something we should do about it |
| 3861 | */ |
| 3862 | static void |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3863 | cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
| 3864 | struct request *rq) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3865 | { |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3866 | struct cfq_io_cq *cic = RQ_CIC(rq); |
Jens Axboe | 12e9fdd | 2006-06-01 10:09:56 +0200 | [diff] [blame] | 3867 | |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3868 | cfqd->rq_queued++; |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 3869 | if (rq->cmd_flags & REQ_PRIO) |
| 3870 | cfqq->prio_pending++; |
Jens Axboe | 374f84a | 2006-07-23 01:42:19 +0200 | [diff] [blame] | 3871 | |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3872 | cfq_update_io_thinktime(cfqd, cfqq, cic); |
Jeff Moyer | b2c18e1 | 2009-10-23 17:14:49 -0400 | [diff] [blame] | 3873 | cfq_update_io_seektime(cfqd, cfqq, rq); |
Jens Axboe | 9c2c38a | 2005-08-24 14:57:54 +0200 | [diff] [blame] | 3874 | cfq_update_idle_window(cfqd, cfqq, cic); |
| 3875 | |
Jeff Moyer | b2c18e1 | 2009-10-23 17:14:49 -0400 | [diff] [blame] | 3876 | cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3877 | |
| 3878 | if (cfqq == cfqd->active_queue) { |
| 3879 | /* |
Jens Axboe | b029195 | 2009-04-07 11:38:31 +0200 | [diff] [blame] | 3880 | * Remember that we saw a request from this process, but |
| 3881 | * don't start queuing just yet. Otherwise we risk seeing lots |
| 3882 | * of tiny requests, because we disrupt the normal plugging |
Jens Axboe | d6ceb25 | 2009-04-14 14:18:16 +0200 | [diff] [blame] | 3883 | * and merging. If the request is already larger than a single |
| 3884 | * page, let it rip immediately. For that case we assume that |
Jens Axboe | 2d87072 | 2009-04-15 12:12:46 +0200 | [diff] [blame] | 3885 | * merging is already done. Ditto for a busy system that |
| 3886 | * has other work pending, don't risk delaying until the |
| 3887 | * idle timer unplug to continue working. |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3888 | */ |
Jens Axboe | d6ceb25 | 2009-04-14 14:18:16 +0200 | [diff] [blame] | 3889 | if (cfq_cfqq_wait_request(cfqq)) { |
Jens Axboe | 2d87072 | 2009-04-15 12:12:46 +0200 | [diff] [blame] | 3890 | if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE || |
| 3891 | cfqd->busy_queues > 1) { |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 3892 | cfq_del_timer(cfqd, cfqq); |
Gui Jianfeng | 554554f | 2009-12-10 09:38:39 +0100 | [diff] [blame] | 3893 | cfq_clear_cfqq_wait_request(cfqq); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 3894 | __blk_run_queue(cfqd->queue); |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 3895 | } else { |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 3896 | cfqg_stats_update_idle_time(cfqq->cfqg); |
Vivek Goyal | bf791937 | 2009-12-03 12:59:37 -0500 | [diff] [blame] | 3897 | cfq_mark_cfqq_must_dispatch(cfqq); |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 3898 | } |
Jens Axboe | d6ceb25 | 2009-04-14 14:18:16 +0200 | [diff] [blame] | 3899 | } |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3900 | } else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3901 | /* |
| 3902 | * not the active queue - expire current slice if it is |
| 3903 | * idle and has expired it's mean thinktime or this new queue |
Divyesh Shah | 3a9a3f6 | 2009-01-30 12:46:41 +0100 | [diff] [blame] | 3904 | * has some old slice time left and is of higher priority or |
| 3905 | * this new queue is RT and the current one is BE |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3906 | */ |
| 3907 | cfq_preempt_queue(cfqd, cfqq); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 3908 | __blk_run_queue(cfqd->queue); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3909 | } |
| 3910 | } |
| 3911 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 3912 | static void cfq_insert_request(struct request_queue *q, struct request *rq) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3913 | { |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 3914 | struct cfq_data *cfqd = q->elevator->elevator_data; |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3915 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3916 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 3917 | cfq_log_cfqq(cfqd, cfqq, "insert_request"); |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 3918 | cfq_init_prio_data(cfqq, RQ_CIC(rq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3919 | |
Jens Axboe | 30996f4 | 2009-10-05 11:03:39 +0200 | [diff] [blame] | 3920 | rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 3921 | list_add_tail(&rq->queuelist, &cfqq->fifo); |
Corrado Zoccolo | aa6f6a3 | 2009-10-26 22:44:33 +0100 | [diff] [blame] | 3922 | cfq_add_rq_rb(rq); |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 3923 | cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group, |
| 3924 | rq->cmd_flags); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 3925 | cfq_rq_enqueued(cfqd, cfqq, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | } |
| 3927 | |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3928 | /* |
| 3929 | * Update hw_tag based on peak queue depth over 50 samples under |
| 3930 | * sufficient load. |
| 3931 | */ |
| 3932 | static void cfq_update_hw_tag(struct cfq_data *cfqd) |
| 3933 | { |
Shaohua Li | 1a1238a | 2009-10-27 08:46:23 +0100 | [diff] [blame] | 3934 | struct cfq_queue *cfqq = cfqd->active_queue; |
| 3935 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 3936 | if (cfqd->rq_in_driver > cfqd->hw_tag_est_depth) |
| 3937 | cfqd->hw_tag_est_depth = cfqd->rq_in_driver; |
Corrado Zoccolo | e459dd0 | 2009-11-26 10:02:57 +0100 | [diff] [blame] | 3938 | |
| 3939 | if (cfqd->hw_tag == 1) |
| 3940 | return; |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3941 | |
| 3942 | if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 3943 | cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3944 | return; |
| 3945 | |
Shaohua Li | 1a1238a | 2009-10-27 08:46:23 +0100 | [diff] [blame] | 3946 | /* |
| 3947 | * If active queue hasn't enough requests and can idle, cfq might not |
| 3948 | * dispatch sufficient requests to hardware. Don't zero hw_tag in this |
| 3949 | * case |
| 3950 | */ |
| 3951 | if (cfqq && cfq_cfqq_idle_window(cfqq) && |
| 3952 | cfqq->dispatched + cfqq->queued[0] + cfqq->queued[1] < |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 3953 | CFQ_HW_QUEUE_MIN && cfqd->rq_in_driver < CFQ_HW_QUEUE_MIN) |
Shaohua Li | 1a1238a | 2009-10-27 08:46:23 +0100 | [diff] [blame] | 3954 | return; |
| 3955 | |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3956 | if (cfqd->hw_tag_samples++ < 50) |
| 3957 | return; |
| 3958 | |
Corrado Zoccolo | e459dd0 | 2009-11-26 10:02:57 +0100 | [diff] [blame] | 3959 | if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3960 | cfqd->hw_tag = 1; |
| 3961 | else |
| 3962 | cfqd->hw_tag = 0; |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 3963 | } |
| 3964 | |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3965 | static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
| 3966 | { |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 3967 | struct cfq_io_cq *cic = cfqd->active_cic; |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3968 | |
Justin TerAvest | 02a8f01 | 2011-02-09 14:20:03 +0100 | [diff] [blame] | 3969 | /* If the queue already has requests, don't wait */ |
| 3970 | if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
| 3971 | return false; |
| 3972 | |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3973 | /* If there are other queues in the group, don't wait */ |
| 3974 | if (cfqq->cfqg->nr_cfqq > 1) |
| 3975 | return false; |
| 3976 | |
Shaohua Li | 7700fc4 | 2011-07-12 14:24:56 +0200 | [diff] [blame] | 3977 | /* the only queue in the group, but think time is big */ |
| 3978 | if (cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) |
| 3979 | return false; |
| 3980 | |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3981 | if (cfq_slice_used(cfqq)) |
| 3982 | return true; |
| 3983 | |
| 3984 | /* if slice left is less than think time, wait busy */ |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 3985 | if (cic && sample_valid(cic->ttime.ttime_samples) |
| 3986 | && (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 3987 | return true; |
| 3988 | |
| 3989 | /* |
| 3990 | * If think times is less than a jiffy than ttime_mean=0 and above |
| 3991 | * will not be true. It might happen that slice has not expired yet |
| 3992 | * but will expire soon (4-5 ns) during select_queue(). To cover the |
| 3993 | * case where think time is less than a jiffy, mark the queue wait |
| 3994 | * busy if only 1 jiffy is left in the slice. |
| 3995 | */ |
| 3996 | if (cfqq->slice_end - jiffies == 1) |
| 3997 | return true; |
| 3998 | |
| 3999 | return false; |
| 4000 | } |
| 4001 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 4002 | static void cfq_completed_request(struct request_queue *q, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4003 | { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 4004 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 4005 | struct cfq_data *cfqd = cfqq->cfqd; |
Jens Axboe | 5380a10 | 2006-07-13 12:37:56 +0200 | [diff] [blame] | 4006 | const int sync = rq_is_sync(rq); |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 4007 | unsigned long now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4008 | |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 4009 | now = jiffies; |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 4010 | cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", |
| 4011 | !!(rq->cmd_flags & REQ_NOIDLE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4012 | |
Aaron Carroll | 45333d5 | 2008-08-26 15:52:36 +0200 | [diff] [blame] | 4013 | cfq_update_hw_tag(cfqd); |
| 4014 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 4015 | WARN_ON(!cfqd->rq_in_driver); |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 4016 | WARN_ON(!cfqq->dispatched); |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 4017 | cfqd->rq_in_driver--; |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 4018 | cfqq->dispatched--; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4019 | (RQ_CFQG(rq))->dispatched--; |
Tejun Heo | 155fead | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 4020 | cfqg_stats_update_completion(cfqq->cfqg, rq_start_time_ns(rq), |
| 4021 | rq_io_start_time_ns(rq), rq->cmd_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4022 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 4023 | cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--; |
Jens Axboe | 3ed9a29 | 2007-04-23 08:33:33 +0200 | [diff] [blame] | 4024 | |
Vivek Goyal | 365722b | 2009-10-03 15:21:27 +0200 | [diff] [blame] | 4025 | if (sync) { |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 4026 | struct cfq_rb_root *st; |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 4027 | |
Shaohua Li | 383cd72 | 2011-07-12 14:24:35 +0200 | [diff] [blame] | 4028 | RQ_CIC(rq)->ttime.last_end_request = now; |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 4029 | |
| 4030 | if (cfq_cfqq_on_rr(cfqq)) |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 4031 | st = cfqq->service_tree; |
Shaohua Li | f5f2b6c | 2011-07-12 14:24:55 +0200 | [diff] [blame] | 4032 | else |
Vivek Goyal | 34b98d0 | 2012-10-03 16:56:58 -0400 | [diff] [blame] | 4033 | st = st_for(cfqq->cfqg, cfqq_class(cfqq), |
| 4034 | cfqq_type(cfqq)); |
| 4035 | |
| 4036 | st->ttime.last_end_request = now; |
Corrado Zoccolo | 573412b | 2009-12-06 11:48:52 +0100 | [diff] [blame] | 4037 | if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now)) |
| 4038 | cfqd->last_delayed_sync = now; |
Vivek Goyal | 365722b | 2009-10-03 15:21:27 +0200 | [diff] [blame] | 4039 | } |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 4040 | |
Shaohua Li | 7700fc4 | 2011-07-12 14:24:56 +0200 | [diff] [blame] | 4041 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 4042 | cfqq->cfqg->ttime.last_end_request = now; |
| 4043 | #endif |
| 4044 | |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 4045 | /* |
| 4046 | * If this is the active queue, check if it needs to be expired, |
| 4047 | * or if we want to idle in case it has no pending requests. |
| 4048 | */ |
| 4049 | if (cfqd->active_queue == cfqq) { |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 4050 | const bool cfqq_empty = RB_EMPTY_ROOT(&cfqq->sort_list); |
| 4051 | |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 4052 | if (cfq_cfqq_slice_new(cfqq)) { |
| 4053 | cfq_set_prio_slice(cfqd, cfqq); |
| 4054 | cfq_clear_cfqq_slice_new(cfqq); |
| 4055 | } |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 4056 | |
| 4057 | /* |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 4058 | * Should we wait for next request to come in before we expire |
| 4059 | * the queue. |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 4060 | */ |
Vivek Goyal | 7667aa0 | 2009-12-08 17:52:58 -0500 | [diff] [blame] | 4061 | if (cfq_should_wait_busy(cfqd, cfqq)) { |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4062 | unsigned long extend_sl = cfqd->cfq_slice_idle; |
| 4063 | if (!cfqd->cfq_slice_idle) |
| 4064 | extend_sl = cfqd->cfq_group_idle; |
| 4065 | cfqq->slice_end = jiffies + extend_sl; |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 4066 | cfq_mark_cfqq_wait_busy(cfqq); |
Divyesh Shah | b1ffe73 | 2010-03-25 15:45:03 +0100 | [diff] [blame] | 4067 | cfq_log_cfqq(cfqd, cfqq, "will busy wait"); |
Vivek Goyal | f75edf2 | 2009-12-03 12:59:53 -0500 | [diff] [blame] | 4068 | } |
| 4069 | |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 4070 | /* |
Corrado Zoccolo | 8e55063 | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 4071 | * Idling is not enabled on: |
| 4072 | * - expired queues |
| 4073 | * - idle-priority queues |
| 4074 | * - async queues |
| 4075 | * - queues with still some requests queued |
| 4076 | * - when there is a close cooperator |
Jens Axboe | a36e71f | 2009-04-15 12:15:11 +0200 | [diff] [blame] | 4077 | */ |
Jens Axboe | 0871714 | 2008-01-28 11:38:15 +0100 | [diff] [blame] | 4078 | if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 4079 | cfq_slice_expired(cfqd, 1); |
Corrado Zoccolo | 8e55063 | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 4080 | else if (sync && cfqq_empty && |
| 4081 | !cfq_close_cooperator(cfqd, cfqq)) { |
Corrado Zoccolo | 749ef9f | 2010-09-20 15:24:50 +0200 | [diff] [blame] | 4082 | cfq_arm_slice_timer(cfqd); |
Corrado Zoccolo | 8e55063 | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 4083 | } |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 4084 | } |
Jens Axboe | 6d048f5 | 2007-04-25 12:44:27 +0200 | [diff] [blame] | 4085 | |
Corrado Zoccolo | 53c583d | 2010-02-28 19:45:05 +0100 | [diff] [blame] | 4086 | if (!cfqd->rq_in_driver) |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 4087 | cfq_schedule_dispatch(cfqd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4088 | } |
| 4089 | |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 4090 | static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4091 | { |
Jens Axboe | 1b379d8 | 2009-08-11 08:26:11 +0200 | [diff] [blame] | 4092 | if (cfq_cfqq_wait_request(cfqq) && !cfq_cfqq_must_alloc_slice(cfqq)) { |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4093 | cfq_mark_cfqq_must_alloc_slice(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4094 | return ELV_MQUEUE_MUST; |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4095 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4096 | |
| 4097 | return ELV_MQUEUE_MAY; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4098 | } |
| 4099 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 4100 | static int cfq_may_queue(struct request_queue *q, int rw) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4101 | { |
| 4102 | struct cfq_data *cfqd = q->elevator->elevator_data; |
| 4103 | struct task_struct *tsk = current; |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 4104 | struct cfq_io_cq *cic; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4105 | struct cfq_queue *cfqq; |
| 4106 | |
| 4107 | /* |
| 4108 | * don't force setup of a queue from here, as a call to may_queue |
| 4109 | * does not necessarily imply that a request actually will be queued. |
| 4110 | * so just lookup a possibly existing queue, or return 'may queue' |
| 4111 | * if that fails |
| 4112 | */ |
Jens Axboe | 4ac845a | 2008-01-24 08:44:49 +0100 | [diff] [blame] | 4113 | cic = cfq_cic_lookup(cfqd, tsk->io_context); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 4114 | if (!cic) |
| 4115 | return ELV_MQUEUE_MAY; |
| 4116 | |
Jens Axboe | b0b78f8 | 2009-04-08 10:56:08 +0200 | [diff] [blame] | 4117 | cfqq = cic_to_cfqq(cic, rw_is_sync(rw)); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4118 | if (cfqq) { |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 4119 | cfq_init_prio_data(cfqq, cic); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4120 | |
Jens Axboe | 89850f7 | 2006-07-22 16:48:31 +0200 | [diff] [blame] | 4121 | return __cfq_may_queue(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4122 | } |
| 4123 | |
| 4124 | return ELV_MQUEUE_MAY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4125 | } |
| 4126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4127 | /* |
| 4128 | * queue lock held here |
| 4129 | */ |
Jens Axboe | bb37b94 | 2006-12-01 10:42:33 +0100 | [diff] [blame] | 4130 | static void cfq_put_request(struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4131 | { |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 4132 | struct cfq_queue *cfqq = RQ_CFQQ(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4133 | |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 4134 | if (cfqq) { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4135 | const int rw = rq_data_dir(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4136 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4137 | BUG_ON(!cfqq->allocated[rw]); |
| 4138 | cfqq->allocated[rw]--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4139 | |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 4140 | /* Put down rq reference on cfqg */ |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 4141 | cfqg_put(RQ_CFQG(rq)); |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 4142 | rq->elv.priv[0] = NULL; |
| 4143 | rq->elv.priv[1] = NULL; |
Vivek Goyal | 7f1dc8a | 2010-04-21 17:44:16 +0200 | [diff] [blame] | 4144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4145 | cfq_put_queue(cfqq); |
| 4146 | } |
| 4147 | } |
| 4148 | |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 4149 | static struct cfq_queue * |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 4150 | cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_cq *cic, |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 4151 | struct cfq_queue *cfqq) |
| 4152 | { |
| 4153 | cfq_log_cfqq(cfqd, cfqq, "merging with queue %p", cfqq->new_cfqq); |
| 4154 | cic_set_cfqq(cic, cfqq->new_cfqq, 1); |
Jeff Moyer | b3b6d04 | 2009-10-23 17:14:51 -0400 | [diff] [blame] | 4155 | cfq_mark_cfqq_coop(cfqq->new_cfqq); |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 4156 | cfq_put_queue(cfqq); |
| 4157 | return cic_to_cfqq(cic, 1); |
| 4158 | } |
| 4159 | |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4160 | /* |
| 4161 | * Returns NULL if a new cfqq should be allocated, or the old cfqq if this |
| 4162 | * was the last process referring to said cfqq. |
| 4163 | */ |
| 4164 | static struct cfq_queue * |
Tejun Heo | c586980 | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 4165 | split_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq) |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4166 | { |
| 4167 | if (cfqq_process_refs(cfqq) == 1) { |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4168 | cfqq->pid = current->pid; |
| 4169 | cfq_clear_cfqq_coop(cfqq); |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 4170 | cfq_clear_cfqq_split_coop(cfqq); |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4171 | return cfqq; |
| 4172 | } |
| 4173 | |
| 4174 | cic_set_cfqq(cic, NULL, 1); |
Shaohua Li | d02a2c0 | 2010-05-25 10:16:53 +0200 | [diff] [blame] | 4175 | |
| 4176 | cfq_put_cooperator(cfqq); |
| 4177 | |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4178 | cfq_put_queue(cfqq); |
| 4179 | return NULL; |
| 4180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4181 | /* |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4182 | * Allocate cfq data structures associated with this request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4183 | */ |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4184 | static int |
Tejun Heo | 852c788 | 2012-03-05 13:15:27 -0800 | [diff] [blame] | 4185 | cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio, |
| 4186 | gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4187 | { |
| 4188 | struct cfq_data *cfqd = q->elevator->elevator_data; |
Tejun Heo | f1f8cc9 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4189 | struct cfq_io_cq *cic = icq_to_cic(rq->elv.icq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4190 | const int rw = rq_data_dir(rq); |
Jens Axboe | a6151c3 | 2009-10-07 20:02:57 +0200 | [diff] [blame] | 4191 | const bool is_sync = rq_is_sync(rq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4192 | struct cfq_queue *cfqq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4193 | |
| 4194 | might_sleep_if(gfp_mask & __GFP_WAIT); |
| 4195 | |
Tejun Heo | 216284c | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 4196 | spin_lock_irq(q->queue_lock); |
Tejun Heo | f1f8cc9 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4197 | |
Tejun Heo | 598971b | 2012-03-19 15:10:58 -0700 | [diff] [blame] | 4198 | check_ioprio_changed(cic, bio); |
| 4199 | check_blkcg_changed(cic, bio); |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4200 | new_queue: |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 4201 | cfqq = cic_to_cfqq(cic, is_sync); |
Vivek Goyal | 32f2e80 | 2009-07-09 22:13:16 +0200 | [diff] [blame] | 4202 | if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
Tejun Heo | abede6d | 2012-03-19 15:10:57 -0700 | [diff] [blame] | 4203 | cfqq = cfq_get_queue(cfqd, is_sync, cic, bio, gfp_mask); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 4204 | cic_set_cfqq(cic, cfqq, is_sync); |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 4205 | } else { |
| 4206 | /* |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4207 | * If the queue was seeky for too long, break it apart. |
| 4208 | */ |
Shaohua Li | ae54abe | 2010-02-05 13:11:45 +0100 | [diff] [blame] | 4209 | if (cfq_cfqq_coop(cfqq) && cfq_cfqq_split_coop(cfqq)) { |
Jeff Moyer | e6c5bc7 | 2009-10-23 17:14:52 -0400 | [diff] [blame] | 4210 | cfq_log_cfqq(cfqd, cfqq, "breaking apart cfqq"); |
| 4211 | cfqq = split_cfqq(cic, cfqq); |
| 4212 | if (!cfqq) |
| 4213 | goto new_queue; |
| 4214 | } |
| 4215 | |
| 4216 | /* |
Jeff Moyer | df5fe3e | 2009-10-23 17:14:50 -0400 | [diff] [blame] | 4217 | * Check to see if this queue is scheduled to merge with |
| 4218 | * another, closely cooperating queue. The merging of |
| 4219 | * queues happens here as it must be done in process context. |
| 4220 | * The reference on new_cfqq was taken in merge_cfqqs. |
| 4221 | */ |
| 4222 | if (cfqq->new_cfqq) |
| 4223 | cfqq = cfq_merge_cfqqs(cfqd, cic, cfqq); |
Vasily Tarasov | 91fac31 | 2007-04-25 12:29:51 +0200 | [diff] [blame] | 4224 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4225 | |
| 4226 | cfqq->allocated[rw]++; |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 4227 | |
Jens Axboe | 6fae9c2 | 2011-03-01 15:04:39 -0500 | [diff] [blame] | 4228 | cfqq->ref++; |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 4229 | cfqg_get(cfqq->cfqg); |
Tejun Heo | a612fdd | 2011-12-14 00:33:41 +0100 | [diff] [blame] | 4230 | rq->elv.priv[0] = cfqq; |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame] | 4231 | rq->elv.priv[1] = cfqq->cfqg; |
Tejun Heo | 216284c | 2011-12-14 00:33:38 +0100 | [diff] [blame] | 4232 | spin_unlock_irq(q->queue_lock); |
Jens Axboe | 5e70537 | 2006-07-13 12:39:25 +0200 | [diff] [blame] | 4233 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4234 | } |
| 4235 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 4236 | static void cfq_kick_queue(struct work_struct *work) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4237 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 4238 | struct cfq_data *cfqd = |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 4239 | container_of(work, struct cfq_data, unplug_work); |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 4240 | struct request_queue *q = cfqd->queue; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4241 | |
Jens Axboe | 40bb54d | 2009-04-15 12:11:10 +0200 | [diff] [blame] | 4242 | spin_lock_irq(q->queue_lock); |
Christoph Hellwig | 24ecfbe | 2011-04-18 11:41:33 +0200 | [diff] [blame] | 4243 | __blk_run_queue(cfqd->queue); |
Jens Axboe | 40bb54d | 2009-04-15 12:11:10 +0200 | [diff] [blame] | 4244 | spin_unlock_irq(q->queue_lock); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4245 | } |
| 4246 | |
| 4247 | /* |
| 4248 | * Timer running if the active_queue is currently idling inside its time slice |
| 4249 | */ |
| 4250 | static void cfq_idle_slice_timer(unsigned long data) |
| 4251 | { |
| 4252 | struct cfq_data *cfqd = (struct cfq_data *) data; |
| 4253 | struct cfq_queue *cfqq; |
| 4254 | unsigned long flags; |
Jens Axboe | 3c6bd2f | 2007-01-19 12:06:33 +1100 | [diff] [blame] | 4255 | int timed_out = 1; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4256 | |
Jens Axboe | 7b67913 | 2008-05-30 12:23:07 +0200 | [diff] [blame] | 4257 | cfq_log(cfqd, "idle timer fired"); |
| 4258 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4259 | spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
| 4260 | |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 4261 | cfqq = cfqd->active_queue; |
| 4262 | if (cfqq) { |
Jens Axboe | 3c6bd2f | 2007-01-19 12:06:33 +1100 | [diff] [blame] | 4263 | timed_out = 0; |
| 4264 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4265 | /* |
Jens Axboe | b029195 | 2009-04-07 11:38:31 +0200 | [diff] [blame] | 4266 | * We saw a request before the queue expired, let it through |
| 4267 | */ |
| 4268 | if (cfq_cfqq_must_dispatch(cfqq)) |
| 4269 | goto out_kick; |
| 4270 | |
| 4271 | /* |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4272 | * expired |
| 4273 | */ |
Jens Axboe | 44f7c16 | 2007-01-19 11:51:58 +1100 | [diff] [blame] | 4274 | if (cfq_slice_used(cfqq)) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4275 | goto expire; |
| 4276 | |
| 4277 | /* |
| 4278 | * only expire and reinvoke request handler, if there are |
| 4279 | * other queues with pending requests |
| 4280 | */ |
Jens Axboe | caaa5f9 | 2006-06-16 11:23:00 +0200 | [diff] [blame] | 4281 | if (!cfqd->busy_queues) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4282 | goto out_cont; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4283 | |
| 4284 | /* |
| 4285 | * not expired and it has a request pending, let it dispatch |
| 4286 | */ |
Jens Axboe | 75e5098 | 2009-04-07 08:56:14 +0200 | [diff] [blame] | 4287 | if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4288 | goto out_kick; |
Corrado Zoccolo | 76280af | 2009-11-26 10:02:58 +0100 | [diff] [blame] | 4289 | |
| 4290 | /* |
| 4291 | * Queue depth flag is reset only when the idle didn't succeed |
| 4292 | */ |
| 4293 | cfq_clear_cfqq_deep(cfqq); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4294 | } |
| 4295 | expire: |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 4296 | cfq_slice_expired(cfqd, timed_out); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4297 | out_kick: |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 4298 | cfq_schedule_dispatch(cfqd); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4299 | out_cont: |
| 4300 | spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
| 4301 | } |
| 4302 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4303 | static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) |
| 4304 | { |
| 4305 | del_timer_sync(&cfqd->idle_slice_timer); |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 4306 | cancel_work_sync(&cfqd->unplug_work); |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4307 | } |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4308 | |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 4309 | static void cfq_put_async_queues(struct cfq_data *cfqd) |
| 4310 | { |
| 4311 | int i; |
| 4312 | |
| 4313 | for (i = 0; i < IOPRIO_BE_NR; i++) { |
| 4314 | if (cfqd->async_cfqq[0][i]) |
| 4315 | cfq_put_queue(cfqd->async_cfqq[0][i]); |
| 4316 | if (cfqd->async_cfqq[1][i]) |
| 4317 | cfq_put_queue(cfqd->async_cfqq[1][i]); |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 4318 | } |
Oleg Nesterov | 2389d1e | 2007-11-05 08:58:05 +0100 | [diff] [blame] | 4319 | |
| 4320 | if (cfqd->async_idle_cfqq) |
| 4321 | cfq_put_queue(cfqd->async_idle_cfqq); |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 4322 | } |
| 4323 | |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 4324 | static void cfq_exit_queue(struct elevator_queue *e) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4325 | { |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4326 | struct cfq_data *cfqd = e->elevator_data; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 4327 | struct request_queue *q = cfqd->queue; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4328 | |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4329 | cfq_shutdown_timer_wq(cfqd); |
Jens Axboe | e2d74ac | 2006-03-28 08:59:01 +0200 | [diff] [blame] | 4330 | |
Al Viro | d9ff418 | 2006-03-18 13:51:22 -0500 | [diff] [blame] | 4331 | spin_lock_irq(q->queue_lock); |
Jens Axboe | e2d74ac | 2006-03-28 08:59:01 +0200 | [diff] [blame] | 4332 | |
Al Viro | d9ff418 | 2006-03-18 13:51:22 -0500 | [diff] [blame] | 4333 | if (cfqd->active_queue) |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 4334 | __cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
Jens Axboe | e2d74ac | 2006-03-28 08:59:01 +0200 | [diff] [blame] | 4335 | |
Vasily Tarasov | c2dea2d | 2007-07-20 10:06:38 +0200 | [diff] [blame] | 4336 | cfq_put_async_queues(cfqd); |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 4337 | |
| 4338 | spin_unlock_irq(q->queue_lock); |
| 4339 | |
Al Viro | a90d742 | 2006-03-18 12:05:37 -0500 | [diff] [blame] | 4340 | cfq_shutdown_timer_wq(cfqd); |
| 4341 | |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4342 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 4343 | blkcg_deactivate_policy(q, &blkcg_policy_cfq); |
| 4344 | #else |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4345 | kfree(cfqd->root_group); |
Vivek Goyal | 2abae55 | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 4346 | #endif |
Vivek Goyal | 56edf7d | 2011-05-19 15:38:22 -0400 | [diff] [blame] | 4347 | kfree(cfqd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4348 | } |
| 4349 | |
Tejun Heo | b2fab5a | 2012-03-05 13:14:57 -0800 | [diff] [blame] | 4350 | static int cfq_init_queue(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4351 | { |
| 4352 | struct cfq_data *cfqd; |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4353 | struct blkcg_gq *blkg __maybe_unused; |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4354 | int i, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4355 | |
Christoph Lameter | 94f6030 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 4356 | cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node); |
Tejun Heo | a73f730 | 2011-12-14 00:33:37 +0100 | [diff] [blame] | 4357 | if (!cfqd) |
Tejun Heo | b2fab5a | 2012-03-05 13:14:57 -0800 | [diff] [blame] | 4358 | return -ENOMEM; |
Konstantin Khlebnikov | 80b15c7 | 2010-05-20 23:21:41 +0400 | [diff] [blame] | 4359 | |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4360 | cfqd->queue = q; |
| 4361 | q->elevator->elevator_data = cfqd; |
| 4362 | |
Vivek Goyal | 1fa8f6d | 2009-12-03 12:59:41 -0500 | [diff] [blame] | 4363 | /* Init root service tree */ |
| 4364 | cfqd->grp_service_tree = CFQ_RB_ROOT; |
| 4365 | |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4366 | /* Init root group and prefer root group over other groups by default */ |
Vivek Goyal | 25fb516 | 2009-12-03 12:59:46 -0500 | [diff] [blame] | 4367 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4368 | ret = blkcg_activate_policy(q, &blkcg_policy_cfq); |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4369 | if (ret) |
| 4370 | goto out_free; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 4371 | |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4372 | cfqd->root_group = blkg_to_cfqg(q->root_blkg); |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4373 | #else |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4374 | ret = -ENOMEM; |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4375 | cfqd->root_group = kzalloc_node(sizeof(*cfqd->root_group), |
| 4376 | GFP_KERNEL, cfqd->queue->node); |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4377 | if (!cfqd->root_group) |
| 4378 | goto out_free; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 4379 | |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4380 | cfq_init_cfqg_base(cfqd->root_group); |
| 4381 | #endif |
Tejun Heo | 3381cb8 | 2012-04-01 14:38:44 -0700 | [diff] [blame] | 4382 | cfqd->root_group->weight = 2 * CFQ_WEIGHT_DEFAULT; |
Tejun Heo | e71357e | 2013-01-09 08:05:10 -0800 | [diff] [blame] | 4383 | cfqd->root_group->leaf_weight = 2 * CFQ_WEIGHT_DEFAULT; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 4384 | |
Jens Axboe | 26a2ac0 | 2009-04-23 12:13:27 +0200 | [diff] [blame] | 4385 | /* |
| 4386 | * Not strictly needed (since RB_ROOT just clears the node and we |
| 4387 | * zeroed cfqd on alloc), but better be safe in case someone decides |
| 4388 | * to add magic to the rb code |
| 4389 | */ |
| 4390 | for (i = 0; i < CFQ_PRIO_LISTS; i++) |
| 4391 | cfqd->prio_trees[i] = RB_ROOT; |
| 4392 | |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 4393 | /* |
| 4394 | * Our fallback cfqq if cfq_find_alloc_queue() runs into OOM issues. |
| 4395 | * Grab a permanent reference to it, so that the normal code flow |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4396 | * will not attempt to free it. oom_cfqq is linked to root_group |
| 4397 | * but shouldn't hold a reference as it'll never be unlinked. Lose |
| 4398 | * the reference from linking right away. |
Jens Axboe | 6118b70 | 2009-06-30 09:34:12 +0200 | [diff] [blame] | 4399 | */ |
| 4400 | cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0); |
Shaohua Li | 30d7b94 | 2011-01-07 08:46:59 +0100 | [diff] [blame] | 4401 | cfqd->oom_cfqq.ref++; |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame] | 4402 | |
| 4403 | spin_lock_irq(q->queue_lock); |
Tejun Heo | f51b802 | 2012-03-05 13:15:05 -0800 | [diff] [blame] | 4404 | cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group); |
Tejun Heo | eb7d8c07 | 2012-03-23 14:02:53 +0100 | [diff] [blame] | 4405 | cfqg_put(cfqd->root_group); |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame] | 4406 | spin_unlock_irq(q->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4407 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4408 | init_timer(&cfqd->idle_slice_timer); |
| 4409 | cfqd->idle_slice_timer.function = cfq_idle_slice_timer; |
| 4410 | cfqd->idle_slice_timer.data = (unsigned long) cfqd; |
| 4411 | |
Jens Axboe | 23e018a | 2009-10-05 08:52:35 +0200 | [diff] [blame] | 4412 | INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4414 | cfqd->cfq_quantum = cfq_quantum; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4415 | cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; |
| 4416 | cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4417 | cfqd->cfq_back_max = cfq_back_max; |
| 4418 | cfqd->cfq_back_penalty = cfq_back_penalty; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4419 | cfqd->cfq_slice[0] = cfq_slice_async; |
| 4420 | cfqd->cfq_slice[1] = cfq_slice_sync; |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 4421 | cfqd->cfq_target_latency = cfq_target_latency; |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4422 | cfqd->cfq_slice_async_rq = cfq_slice_async_rq; |
| 4423 | cfqd->cfq_slice_idle = cfq_slice_idle; |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4424 | cfqd->cfq_group_idle = cfq_group_idle; |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 4425 | cfqd->cfq_latency = 1; |
Corrado Zoccolo | e459dd0 | 2009-11-26 10:02:57 +0100 | [diff] [blame] | 4426 | cfqd->hw_tag = -1; |
Corrado Zoccolo | edc7113 | 2009-12-09 20:56:04 +0100 | [diff] [blame] | 4427 | /* |
| 4428 | * we optimistically start assuming sync ops weren't delayed in last |
| 4429 | * second, in order to have larger depth for async operations. |
| 4430 | */ |
Corrado Zoccolo | 573412b | 2009-12-06 11:48:52 +0100 | [diff] [blame] | 4431 | cfqd->last_delayed_sync = jiffies - HZ; |
Tejun Heo | b2fab5a | 2012-03-05 13:14:57 -0800 | [diff] [blame] | 4432 | return 0; |
Tejun Heo | a2b1693 | 2012-04-13 13:11:33 -0700 | [diff] [blame] | 4433 | |
| 4434 | out_free: |
| 4435 | kfree(cfqd); |
| 4436 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4437 | } |
| 4438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4439 | /* |
| 4440 | * sysfs parts below --> |
| 4441 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4442 | static ssize_t |
| 4443 | cfq_var_show(unsigned int var, char *page) |
| 4444 | { |
| 4445 | return sprintf(page, "%d\n", var); |
| 4446 | } |
| 4447 | |
| 4448 | static ssize_t |
| 4449 | cfq_var_store(unsigned int *var, const char *page, size_t count) |
| 4450 | { |
| 4451 | char *p = (char *) page; |
| 4452 | |
| 4453 | *var = simple_strtoul(p, &p, 10); |
| 4454 | return count; |
| 4455 | } |
| 4456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4457 | #define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 4458 | static ssize_t __FUNC(struct elevator_queue *e, char *page) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4459 | { \ |
Al Viro | 3d1ab40 | 2006-03-18 18:35:43 -0500 | [diff] [blame] | 4460 | struct cfq_data *cfqd = e->elevator_data; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4461 | unsigned int __data = __VAR; \ |
| 4462 | if (__CONV) \ |
| 4463 | __data = jiffies_to_msecs(__data); \ |
| 4464 | return cfq_var_show(__data, (page)); \ |
| 4465 | } |
| 4466 | SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4467 | SHOW_FUNCTION(cfq_fifo_expire_sync_show, cfqd->cfq_fifo_expire[1], 1); |
| 4468 | SHOW_FUNCTION(cfq_fifo_expire_async_show, cfqd->cfq_fifo_expire[0], 1); |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4469 | SHOW_FUNCTION(cfq_back_seek_max_show, cfqd->cfq_back_max, 0); |
| 4470 | SHOW_FUNCTION(cfq_back_seek_penalty_show, cfqd->cfq_back_penalty, 0); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4471 | SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4472 | SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4473 | SHOW_FUNCTION(cfq_slice_sync_show, cfqd->cfq_slice[1], 1); |
| 4474 | SHOW_FUNCTION(cfq_slice_async_show, cfqd->cfq_slice[0], 1); |
| 4475 | SHOW_FUNCTION(cfq_slice_async_rq_show, cfqd->cfq_slice_async_rq, 0); |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 4476 | SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 4477 | SHOW_FUNCTION(cfq_target_latency_show, cfqd->cfq_target_latency, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4478 | #undef SHOW_FUNCTION |
| 4479 | |
| 4480 | #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
Jens Axboe | b374d18 | 2008-10-31 10:05:07 +0100 | [diff] [blame] | 4481 | static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4482 | { \ |
Al Viro | 3d1ab40 | 2006-03-18 18:35:43 -0500 | [diff] [blame] | 4483 | struct cfq_data *cfqd = e->elevator_data; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4484 | unsigned int __data; \ |
| 4485 | int ret = cfq_var_store(&__data, (page), count); \ |
| 4486 | if (__data < (MIN)) \ |
| 4487 | __data = (MIN); \ |
| 4488 | else if (__data > (MAX)) \ |
| 4489 | __data = (MAX); \ |
| 4490 | if (__CONV) \ |
| 4491 | *(__PTR) = msecs_to_jiffies(__data); \ |
| 4492 | else \ |
| 4493 | *(__PTR) = __data; \ |
| 4494 | return ret; \ |
| 4495 | } |
| 4496 | STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 4497 | STORE_FUNCTION(cfq_fifo_expire_sync_store, &cfqd->cfq_fifo_expire[1], 1, |
| 4498 | UINT_MAX, 1); |
| 4499 | STORE_FUNCTION(cfq_fifo_expire_async_store, &cfqd->cfq_fifo_expire[0], 1, |
| 4500 | UINT_MAX, 1); |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4501 | STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 4502 | STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, |
| 4503 | UINT_MAX, 0); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4504 | STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4505 | STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1); |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4506 | STORE_FUNCTION(cfq_slice_sync_store, &cfqd->cfq_slice[1], 1, UINT_MAX, 1); |
| 4507 | STORE_FUNCTION(cfq_slice_async_store, &cfqd->cfq_slice[0], 1, UINT_MAX, 1); |
Jens Axboe | fe094d9 | 2008-01-31 13:08:54 +0100 | [diff] [blame] | 4508 | STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, |
| 4509 | UINT_MAX, 0); |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 4510 | STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 4511 | STORE_FUNCTION(cfq_target_latency_store, &cfqd->cfq_target_latency, 1, UINT_MAX, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4512 | #undef STORE_FUNCTION |
| 4513 | |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4514 | #define CFQ_ATTR(name) \ |
| 4515 | __ATTR(name, S_IRUGO|S_IWUSR, cfq_##name##_show, cfq_##name##_store) |
Jens Axboe | 3b18152 | 2005-06-27 10:56:24 +0200 | [diff] [blame] | 4516 | |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4517 | static struct elv_fs_entry cfq_attrs[] = { |
| 4518 | CFQ_ATTR(quantum), |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4519 | CFQ_ATTR(fifo_expire_sync), |
| 4520 | CFQ_ATTR(fifo_expire_async), |
| 4521 | CFQ_ATTR(back_seek_max), |
| 4522 | CFQ_ATTR(back_seek_penalty), |
| 4523 | CFQ_ATTR(slice_sync), |
| 4524 | CFQ_ATTR(slice_async), |
| 4525 | CFQ_ATTR(slice_async_rq), |
| 4526 | CFQ_ATTR(slice_idle), |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4527 | CFQ_ATTR(group_idle), |
Jens Axboe | 963b72f | 2009-10-03 19:42:18 +0200 | [diff] [blame] | 4528 | CFQ_ATTR(low_latency), |
Tao Ma | 5bf14c0 | 2012-04-01 14:33:39 -0700 | [diff] [blame] | 4529 | CFQ_ATTR(target_latency), |
Al Viro | e572ec7 | 2006-03-18 22:27:18 -0500 | [diff] [blame] | 4530 | __ATTR_NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4531 | }; |
| 4532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4533 | static struct elevator_type iosched_cfq = { |
| 4534 | .ops = { |
| 4535 | .elevator_merge_fn = cfq_merge, |
| 4536 | .elevator_merged_fn = cfq_merged_request, |
| 4537 | .elevator_merge_req_fn = cfq_merged_requests, |
Jens Axboe | da77526 | 2006-12-20 11:04:12 +0100 | [diff] [blame] | 4538 | .elevator_allow_merge_fn = cfq_allow_merge, |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 4539 | .elevator_bio_merged_fn = cfq_bio_merged, |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 4540 | .elevator_dispatch_fn = cfq_dispatch_requests, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4541 | .elevator_add_req_fn = cfq_insert_request, |
Jens Axboe | b4878f2 | 2005-10-20 16:42:29 +0200 | [diff] [blame] | 4542 | .elevator_activate_req_fn = cfq_activate_request, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4543 | .elevator_deactivate_req_fn = cfq_deactivate_request, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4544 | .elevator_completed_req_fn = cfq_completed_request, |
Jens Axboe | 21183b0 | 2006-07-13 12:33:14 +0200 | [diff] [blame] | 4545 | .elevator_former_req_fn = elv_rb_former_request, |
| 4546 | .elevator_latter_req_fn = elv_rb_latter_request, |
Tejun Heo | 9b84cac | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4547 | .elevator_init_icq_fn = cfq_init_icq, |
Tejun Heo | 7e5a879 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4548 | .elevator_exit_icq_fn = cfq_exit_icq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4549 | .elevator_set_req_fn = cfq_set_request, |
| 4550 | .elevator_put_req_fn = cfq_put_request, |
| 4551 | .elevator_may_queue_fn = cfq_may_queue, |
| 4552 | .elevator_init_fn = cfq_init_queue, |
| 4553 | .elevator_exit_fn = cfq_exit_queue, |
| 4554 | }, |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4555 | .icq_size = sizeof(struct cfq_io_cq), |
| 4556 | .icq_align = __alignof__(struct cfq_io_cq), |
Al Viro | 3d1ab40 | 2006-03-18 18:35:43 -0500 | [diff] [blame] | 4557 | .elevator_attrs = cfq_attrs, |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4558 | .elevator_name = "cfq", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4559 | .elevator_owner = THIS_MODULE, |
| 4560 | }; |
| 4561 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 4562 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4563 | static struct blkcg_policy blkcg_policy_cfq = { |
Tejun Heo | f9fcc2d | 2012-04-16 13:57:27 -0700 | [diff] [blame] | 4564 | .pd_size = sizeof(struct cfq_group), |
| 4565 | .cftypes = cfq_blkcg_files, |
| 4566 | |
| 4567 | .pd_init_fn = cfq_pd_init, |
Tejun Heo | 0b39920 | 2013-01-09 08:05:13 -0800 | [diff] [blame] | 4568 | .pd_offline_fn = cfq_pd_offline, |
Tejun Heo | f9fcc2d | 2012-04-16 13:57:27 -0700 | [diff] [blame] | 4569 | .pd_reset_stats_fn = cfq_pd_reset_stats, |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 4570 | }; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 4571 | #endif |
| 4572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4573 | static int __init cfq_init(void) |
| 4574 | { |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4575 | int ret; |
| 4576 | |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 4577 | /* |
| 4578 | * could be 0 on HZ < 1000 setups |
| 4579 | */ |
| 4580 | if (!cfq_slice_async) |
| 4581 | cfq_slice_async = 1; |
| 4582 | if (!cfq_slice_idle) |
| 4583 | cfq_slice_idle = 1; |
| 4584 | |
Vivek Goyal | 80bdf0c | 2010-08-23 12:24:26 +0200 | [diff] [blame] | 4585 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
| 4586 | if (!cfq_group_idle) |
| 4587 | cfq_group_idle = 1; |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4588 | |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4589 | ret = blkcg_policy_register(&blkcg_policy_cfq); |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4590 | if (ret) |
| 4591 | return ret; |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4592 | #else |
| 4593 | cfq_group_idle = 0; |
| 4594 | #endif |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4595 | |
Tejun Heo | fd79495 | 2012-06-04 10:01:38 +0200 | [diff] [blame] | 4596 | ret = -ENOMEM; |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4597 | cfq_pool = KMEM_CACHE(cfq_queue, 0); |
| 4598 | if (!cfq_pool) |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4599 | goto err_pol_unreg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4600 | |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4601 | ret = elv_register(&iosched_cfq); |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4602 | if (ret) |
| 4603 | goto err_free_pool; |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4604 | |
Adrian Bunk | 2fdd82b | 2007-12-12 18:51:56 +0100 | [diff] [blame] | 4605 | return 0; |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4606 | |
| 4607 | err_free_pool: |
| 4608 | kmem_cache_destroy(cfq_pool); |
| 4609 | err_pol_unreg: |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4610 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4611 | blkcg_policy_unregister(&blkcg_policy_cfq); |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4612 | #endif |
Tejun Heo | 8bd435b | 2012-04-13 13:11:28 -0700 | [diff] [blame] | 4613 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4614 | } |
| 4615 | |
| 4616 | static void __exit cfq_exit(void) |
| 4617 | { |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4618 | #ifdef CONFIG_CFQ_GROUP_IOSCHED |
Tejun Heo | 3c79839 | 2012-04-16 13:57:25 -0700 | [diff] [blame] | 4619 | blkcg_policy_unregister(&blkcg_policy_cfq); |
Tejun Heo | ffea73f | 2012-06-04 10:02:29 +0200 | [diff] [blame] | 4620 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4621 | elv_unregister(&iosched_cfq); |
Tejun Heo | 3d3c237 | 2011-12-14 00:33:42 +0100 | [diff] [blame] | 4622 | kmem_cache_destroy(cfq_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4623 | } |
| 4624 | |
| 4625 | module_init(cfq_init); |
| 4626 | module_exit(cfq_exit); |
| 4627 | |
| 4628 | MODULE_AUTHOR("Jens Axboe"); |
| 4629 | MODULE_LICENSE("GPL"); |
| 4630 | MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |