Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Common Block IO controller cgroup interface |
| 3 | * |
| 4 | * Based on ideas and code from CFQ, CFS and BFQ: |
| 5 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
| 6 | * |
| 7 | * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> |
| 8 | * Paolo Valente <paolo.valente@unimore.it> |
| 9 | * |
| 10 | * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> |
| 11 | * Nauman Rafique <nauman@google.com> |
| 12 | */ |
| 13 | #include <linux/ioprio.h> |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/kdev_t.h> |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 16 | #include <linux/module.h> |
Stephen Rothwell | accee78 | 2009-12-07 19:29:39 +1100 | [diff] [blame] | 17 | #include <linux/err.h> |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 18 | #include <linux/blkdev.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 20 | #include <linux/genhd.h> |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 21 | #include <linux/delay.h> |
| 22 | #include "blk-cgroup.h" |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 23 | #include "blk.h" |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 24 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 25 | #define MAX_KEY_LEN 100 |
| 26 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 27 | static DEFINE_SPINLOCK(blkio_list_lock); |
| 28 | static LIST_HEAD(blkio_list); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 29 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 30 | static DEFINE_MUTEX(all_q_mutex); |
| 31 | static LIST_HEAD(all_q_list); |
| 32 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 33 | struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 34 | EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
| 35 | |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 36 | static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES]; |
| 37 | |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 38 | static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *, |
| 39 | struct cgroup *); |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 40 | static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *, |
| 41 | struct cgroup_taskset *); |
| 42 | static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *, |
| 43 | struct cgroup_taskset *); |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 44 | static int blkiocg_pre_destroy(struct cgroup_subsys *, struct cgroup *); |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 45 | static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *); |
| 46 | static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *); |
| 47 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 48 | /* for encoding cft->private value on file */ |
| 49 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 50 | /* What policy owns the file, proportional or throttle */ |
| 51 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) |
| 52 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
| 53 | |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 54 | struct cgroup_subsys blkio_subsys = { |
| 55 | .name = "blkio", |
| 56 | .create = blkiocg_create, |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 57 | .can_attach = blkiocg_can_attach, |
| 58 | .attach = blkiocg_attach, |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 59 | .pre_destroy = blkiocg_pre_destroy, |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 60 | .destroy = blkiocg_destroy, |
| 61 | .populate = blkiocg_populate, |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 62 | .subsys_id = blkio_subsys_id, |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 63 | .module = THIS_MODULE, |
| 64 | }; |
| 65 | EXPORT_SYMBOL_GPL(blkio_subsys); |
| 66 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 67 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
| 68 | { |
| 69 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), |
| 70 | struct blkio_cgroup, css); |
| 71 | } |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 72 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 73 | |
Vivek Goyal | 70087dc | 2011-05-16 15:24:08 +0200 | [diff] [blame] | 74 | struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) |
| 75 | { |
| 76 | return container_of(task_subsys_state(tsk, blkio_subsys_id), |
| 77 | struct blkio_cgroup, css); |
| 78 | } |
| 79 | EXPORT_SYMBOL_GPL(task_blkio_cgroup); |
| 80 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 81 | static inline void |
| 82 | blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) |
| 83 | { |
| 84 | struct blkio_policy_type *blkiop; |
| 85 | |
| 86 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 87 | /* If this policy does not own the blkg, do not send updates */ |
| 88 | if (blkiop->plid != blkg->plid) |
| 89 | continue; |
| 90 | if (blkiop->ops.blkio_update_group_weight_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 91 | blkiop->ops.blkio_update_group_weight_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 92 | blkg, weight); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 93 | } |
| 94 | } |
| 95 | |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 96 | static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, |
| 97 | int fileid) |
| 98 | { |
| 99 | struct blkio_policy_type *blkiop; |
| 100 | |
| 101 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 102 | |
| 103 | /* If this policy does not own the blkg, do not send updates */ |
| 104 | if (blkiop->plid != blkg->plid) |
| 105 | continue; |
| 106 | |
| 107 | if (fileid == BLKIO_THROTL_read_bps_device |
| 108 | && blkiop->ops.blkio_update_group_read_bps_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 109 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 110 | blkg, bps); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 111 | |
| 112 | if (fileid == BLKIO_THROTL_write_bps_device |
| 113 | && blkiop->ops.blkio_update_group_write_bps_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 114 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 115 | blkg, bps); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 116 | } |
| 117 | } |
| 118 | |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 119 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
| 120 | unsigned int iops, int fileid) |
| 121 | { |
| 122 | struct blkio_policy_type *blkiop; |
| 123 | |
| 124 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 125 | |
| 126 | /* If this policy does not own the blkg, do not send updates */ |
| 127 | if (blkiop->plid != blkg->plid) |
| 128 | continue; |
| 129 | |
| 130 | if (fileid == BLKIO_THROTL_read_iops_device |
| 131 | && blkiop->ops.blkio_update_group_read_iops_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 132 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 133 | blkg, iops); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 134 | |
| 135 | if (fileid == BLKIO_THROTL_write_iops_device |
| 136 | && blkiop->ops.blkio_update_group_write_iops_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 137 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 138 | blkg,iops); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 139 | } |
| 140 | } |
| 141 | |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 142 | /* |
| 143 | * Add to the appropriate stat variable depending on the request type. |
| 144 | * This should be called with the blkg->stats_lock held. |
| 145 | */ |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 146 | static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, |
| 147 | bool sync) |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 148 | { |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 149 | if (direction) |
| 150 | stat[BLKIO_STAT_WRITE] += add; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 151 | else |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 152 | stat[BLKIO_STAT_READ] += add; |
| 153 | if (sync) |
| 154 | stat[BLKIO_STAT_SYNC] += add; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 155 | else |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 156 | stat[BLKIO_STAT_ASYNC] += add; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 159 | /* |
| 160 | * Decrements the appropriate stat variable if non-zero depending on the |
| 161 | * request type. Panics on value being zero. |
| 162 | * This should be called with the blkg->stats_lock held. |
| 163 | */ |
| 164 | static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) |
| 165 | { |
| 166 | if (direction) { |
| 167 | BUG_ON(stat[BLKIO_STAT_WRITE] == 0); |
| 168 | stat[BLKIO_STAT_WRITE]--; |
| 169 | } else { |
| 170 | BUG_ON(stat[BLKIO_STAT_READ] == 0); |
| 171 | stat[BLKIO_STAT_READ]--; |
| 172 | } |
| 173 | if (sync) { |
| 174 | BUG_ON(stat[BLKIO_STAT_SYNC] == 0); |
| 175 | stat[BLKIO_STAT_SYNC]--; |
| 176 | } else { |
| 177 | BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); |
| 178 | stat[BLKIO_STAT_ASYNC]--; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 183 | /* This should be called with the blkg->stats_lock held. */ |
| 184 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
| 185 | struct blkio_group *curr_blkg) |
| 186 | { |
| 187 | if (blkio_blkg_waiting(&blkg->stats)) |
| 188 | return; |
| 189 | if (blkg == curr_blkg) |
| 190 | return; |
| 191 | blkg->stats.start_group_wait_time = sched_clock(); |
| 192 | blkio_mark_blkg_waiting(&blkg->stats); |
| 193 | } |
| 194 | |
| 195 | /* This should be called with the blkg->stats_lock held. */ |
| 196 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) |
| 197 | { |
| 198 | unsigned long long now; |
| 199 | |
| 200 | if (!blkio_blkg_waiting(stats)) |
| 201 | return; |
| 202 | |
| 203 | now = sched_clock(); |
| 204 | if (time_after64(now, stats->start_group_wait_time)) |
| 205 | stats->group_wait_time += now - stats->start_group_wait_time; |
| 206 | blkio_clear_blkg_waiting(stats); |
| 207 | } |
| 208 | |
| 209 | /* This should be called with the blkg->stats_lock held. */ |
| 210 | static void blkio_end_empty_time(struct blkio_group_stats *stats) |
| 211 | { |
| 212 | unsigned long long now; |
| 213 | |
| 214 | if (!blkio_blkg_empty(stats)) |
| 215 | return; |
| 216 | |
| 217 | now = sched_clock(); |
| 218 | if (time_after64(now, stats->start_empty_time)) |
| 219 | stats->empty_time += now - stats->start_empty_time; |
| 220 | blkio_clear_blkg_empty(stats); |
| 221 | } |
| 222 | |
| 223 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
| 224 | { |
| 225 | unsigned long flags; |
| 226 | |
| 227 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 228 | BUG_ON(blkio_blkg_idling(&blkg->stats)); |
| 229 | blkg->stats.start_idle_time = sched_clock(); |
| 230 | blkio_mark_blkg_idling(&blkg->stats); |
| 231 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 232 | } |
| 233 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); |
| 234 | |
| 235 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg) |
| 236 | { |
| 237 | unsigned long flags; |
| 238 | unsigned long long now; |
| 239 | struct blkio_group_stats *stats; |
| 240 | |
| 241 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 242 | stats = &blkg->stats; |
| 243 | if (blkio_blkg_idling(stats)) { |
| 244 | now = sched_clock(); |
| 245 | if (time_after64(now, stats->start_idle_time)) |
| 246 | stats->idle_time += now - stats->start_idle_time; |
| 247 | blkio_clear_blkg_idling(stats); |
| 248 | } |
| 249 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 250 | } |
| 251 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
| 252 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 253 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 254 | { |
| 255 | unsigned long flags; |
| 256 | struct blkio_group_stats *stats; |
| 257 | |
| 258 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 259 | stats = &blkg->stats; |
| 260 | stats->avg_queue_size_sum += |
| 261 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + |
| 262 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; |
| 263 | stats->avg_queue_size_samples++; |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 264 | blkio_update_group_wait_time(stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 265 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 266 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 267 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
| 268 | |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 269 | void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 270 | { |
| 271 | unsigned long flags; |
| 272 | struct blkio_group_stats *stats; |
| 273 | |
| 274 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 275 | stats = &blkg->stats; |
| 276 | |
| 277 | if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || |
| 278 | stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { |
| 279 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 280 | return; |
| 281 | } |
| 282 | |
| 283 | /* |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 284 | * group is already marked empty. This can happen if cfqq got new |
| 285 | * request in parent group and moved to this group while being added |
| 286 | * to service tree. Just ignore the event and move on. |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 287 | */ |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 288 | if(blkio_blkg_empty(stats)) { |
| 289 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 290 | return; |
| 291 | } |
| 292 | |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 293 | stats->start_empty_time = sched_clock(); |
| 294 | blkio_mark_blkg_empty(stats); |
| 295 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 296 | } |
| 297 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
| 298 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 299 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
| 300 | unsigned long dequeue) |
| 301 | { |
| 302 | blkg->stats.dequeue += dequeue; |
| 303 | } |
| 304 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 305 | #else |
| 306 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
| 307 | struct blkio_group *curr_blkg) {} |
| 308 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 309 | #endif |
| 310 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 311 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 312 | struct blkio_group *curr_blkg, bool direction, |
| 313 | bool sync) |
| 314 | { |
| 315 | unsigned long flags; |
| 316 | |
| 317 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 318 | blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, |
| 319 | sync); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 320 | blkio_end_empty_time(&blkg->stats); |
| 321 | blkio_set_start_group_wait_time(blkg, curr_blkg); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 322 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 323 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 324 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 325 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 326 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 327 | bool direction, bool sync) |
| 328 | { |
| 329 | unsigned long flags; |
| 330 | |
| 331 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 332 | blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], |
| 333 | direction, sync); |
| 334 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 335 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 336 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 337 | |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 338 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time, |
| 339 | unsigned long unaccounted_time) |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 340 | { |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 341 | unsigned long flags; |
| 342 | |
| 343 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 344 | blkg->stats.time += time; |
Vivek Goyal | a23e686 | 2011-05-19 15:38:20 -0400 | [diff] [blame] | 345 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 346 | blkg->stats.unaccounted_time += unaccounted_time; |
Vivek Goyal | a23e686 | 2011-05-19 15:38:20 -0400 | [diff] [blame] | 347 | #endif |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 348 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 349 | } |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 350 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 351 | |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 352 | /* |
| 353 | * should be called under rcu read lock or queue lock to make sure blkg pointer |
| 354 | * is valid. |
| 355 | */ |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 356 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
| 357 | uint64_t bytes, bool direction, bool sync) |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 358 | { |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 359 | struct blkio_group_stats_cpu *stats_cpu; |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 360 | unsigned long flags; |
| 361 | |
| 362 | /* |
| 363 | * Disabling interrupts to provide mutual exclusion between two |
| 364 | * writes on same cpu. It probably is not needed for 64bit. Not |
| 365 | * optimizing that case yet. |
| 366 | */ |
| 367 | local_irq_save(flags); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 368 | |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 369 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
| 370 | |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 371 | u64_stats_update_begin(&stats_cpu->syncp); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 372 | stats_cpu->sectors += bytes >> 9; |
| 373 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICED], |
| 374 | 1, direction, sync); |
| 375 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICE_BYTES], |
| 376 | bytes, direction, sync); |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 377 | u64_stats_update_end(&stats_cpu->syncp); |
| 378 | local_irq_restore(flags); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 379 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 380 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 381 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 382 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
| 383 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 384 | { |
| 385 | struct blkio_group_stats *stats; |
| 386 | unsigned long flags; |
| 387 | unsigned long long now = sched_clock(); |
| 388 | |
| 389 | spin_lock_irqsave(&blkg->stats_lock, flags); |
| 390 | stats = &blkg->stats; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 391 | if (time_after64(now, io_start_time)) |
| 392 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], |
| 393 | now - io_start_time, direction, sync); |
| 394 | if (time_after64(io_start_time, start_time)) |
| 395 | blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], |
| 396 | io_start_time - start_time, direction, sync); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 397 | spin_unlock_irqrestore(&blkg->stats_lock, flags); |
| 398 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 399 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 400 | |
Vivek Goyal | 317389a | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 401 | /* Merged stats are per cpu. */ |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 402 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
| 403 | bool sync) |
| 404 | { |
Vivek Goyal | 317389a | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 405 | struct blkio_group_stats_cpu *stats_cpu; |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 406 | unsigned long flags; |
| 407 | |
Vivek Goyal | 317389a | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 408 | /* |
| 409 | * Disabling interrupts to provide mutual exclusion between two |
| 410 | * writes on same cpu. It probably is not needed for 64bit. Not |
| 411 | * optimizing that case yet. |
| 412 | */ |
| 413 | local_irq_save(flags); |
| 414 | |
| 415 | stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
| 416 | |
| 417 | u64_stats_update_begin(&stats_cpu->syncp); |
| 418 | blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1, |
| 419 | direction, sync); |
| 420 | u64_stats_update_end(&stats_cpu->syncp); |
| 421 | local_irq_restore(flags); |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 422 | } |
| 423 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
| 424 | |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 425 | /** |
| 426 | * blkg_free - free a blkg |
| 427 | * @blkg: blkg to free |
| 428 | * |
| 429 | * Free @blkg which may be partially allocated. |
| 430 | */ |
| 431 | static void blkg_free(struct blkio_group *blkg) |
| 432 | { |
| 433 | if (blkg) { |
| 434 | free_percpu(blkg->stats_cpu); |
| 435 | kfree(blkg->pd); |
| 436 | kfree(blkg); |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * blkg_alloc - allocate a blkg |
| 442 | * @blkcg: block cgroup the new blkg is associated with |
| 443 | * @q: request_queue the new blkg is associated with |
| 444 | * @pol: policy the new blkg is associated with |
| 445 | * |
| 446 | * Allocate a new blkg assocating @blkcg and @q for @pol. |
| 447 | * |
| 448 | * FIXME: Should be called with queue locked but currently isn't due to |
| 449 | * percpu stat breakage. |
| 450 | */ |
| 451 | static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg, |
| 452 | struct request_queue *q, |
| 453 | struct blkio_policy_type *pol) |
| 454 | { |
| 455 | struct blkio_group *blkg; |
| 456 | |
| 457 | /* alloc and init base part */ |
| 458 | blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node); |
| 459 | if (!blkg) |
| 460 | return NULL; |
| 461 | |
| 462 | spin_lock_init(&blkg->stats_lock); |
| 463 | rcu_assign_pointer(blkg->q, q); |
| 464 | blkg->blkcg = blkcg; |
| 465 | blkg->plid = pol->plid; |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame^] | 466 | blkg->refcnt = 1; |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 467 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
| 468 | |
| 469 | /* alloc per-policy data */ |
| 470 | blkg->pd = kzalloc_node(sizeof(*blkg->pd) + pol->pdata_size, GFP_ATOMIC, |
| 471 | q->node); |
| 472 | if (!blkg->pd) { |
| 473 | blkg_free(blkg); |
| 474 | return NULL; |
| 475 | } |
| 476 | |
| 477 | /* broken, read comment in the callsite */ |
| 478 | blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu); |
| 479 | if (!blkg->stats_cpu) { |
| 480 | blkg_free(blkg); |
| 481 | return NULL; |
| 482 | } |
| 483 | |
| 484 | /* attach pd to blkg and invoke per-policy init */ |
| 485 | blkg->pd->blkg = blkg; |
| 486 | pol->ops.blkio_init_group_fn(blkg); |
| 487 | return blkg; |
| 488 | } |
| 489 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 490 | struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg, |
| 491 | struct request_queue *q, |
| 492 | enum blkio_policy_id plid, |
| 493 | bool for_root) |
| 494 | __releases(q->queue_lock) __acquires(q->queue_lock) |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 495 | { |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 496 | struct blkio_policy_type *pol = blkio_policy[plid]; |
| 497 | struct blkio_group *blkg, *new_blkg; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 498 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 499 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 500 | lockdep_assert_held(q->queue_lock); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 501 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 502 | /* |
| 503 | * This could be the first entry point of blkcg implementation and |
| 504 | * we shouldn't allow anything to go through for a bypassing queue. |
| 505 | * The following can be removed if blkg lookup is guaranteed to |
| 506 | * fail on a bypassing queue. |
| 507 | */ |
| 508 | if (unlikely(blk_queue_bypass(q)) && !for_root) |
| 509 | return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY); |
| 510 | |
| 511 | blkg = blkg_lookup(blkcg, q, plid); |
| 512 | if (blkg) |
| 513 | return blkg; |
| 514 | |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 515 | /* blkg holds a reference to blkcg */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 516 | if (!css_tryget(&blkcg->css)) |
| 517 | return ERR_PTR(-EINVAL); |
| 518 | |
| 519 | /* |
| 520 | * Allocate and initialize. |
| 521 | * |
| 522 | * FIXME: The following is broken. Percpu memory allocation |
| 523 | * requires %GFP_KERNEL context and can't be performed from IO |
| 524 | * path. Allocation here should inherently be atomic and the |
| 525 | * following lock dancing can be removed once the broken percpu |
| 526 | * allocation is fixed. |
| 527 | */ |
| 528 | spin_unlock_irq(q->queue_lock); |
| 529 | rcu_read_unlock(); |
| 530 | |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 531 | new_blkg = blkg_alloc(blkcg, q, pol); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 532 | |
| 533 | rcu_read_lock(); |
| 534 | spin_lock_irq(q->queue_lock); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 535 | |
| 536 | /* did bypass get turned on inbetween? */ |
| 537 | if (unlikely(blk_queue_bypass(q)) && !for_root) { |
| 538 | blkg = ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY); |
| 539 | goto out; |
| 540 | } |
| 541 | |
| 542 | /* did someone beat us to it? */ |
| 543 | blkg = blkg_lookup(blkcg, q, plid); |
| 544 | if (unlikely(blkg)) |
| 545 | goto out; |
| 546 | |
| 547 | /* did alloc fail? */ |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 548 | if (unlikely(!new_blkg)) { |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 549 | blkg = ERR_PTR(-ENOMEM); |
| 550 | goto out; |
| 551 | } |
| 552 | |
| 553 | /* insert */ |
| 554 | spin_lock(&blkcg->lock); |
| 555 | swap(blkg, new_blkg); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 556 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 557 | pol->ops.blkio_link_group_fn(q, blkg); |
| 558 | spin_unlock(&blkcg->lock); |
| 559 | out: |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 560 | blkg_free(new_blkg); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 561 | return blkg; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 562 | } |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 563 | EXPORT_SYMBOL_GPL(blkg_lookup_create); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 564 | |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 565 | static void __blkiocg_del_blkio_group(struct blkio_group *blkg) |
| 566 | { |
| 567 | hlist_del_init_rcu(&blkg->blkcg_node); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | /* |
| 571 | * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 |
| 572 | * indicating that blk_group was unhashed by the time we got to it. |
| 573 | */ |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 574 | int blkiocg_del_blkio_group(struct blkio_group *blkg) |
| 575 | { |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 576 | struct blkio_cgroup *blkcg = blkg->blkcg; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 577 | unsigned long flags; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 578 | int ret = 1; |
| 579 | |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 580 | spin_lock_irqsave(&blkcg->lock, flags); |
| 581 | if (!hlist_unhashed(&blkg->blkcg_node)) { |
| 582 | __blkiocg_del_blkio_group(blkg); |
| 583 | ret = 0; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 584 | } |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 585 | spin_unlock_irqrestore(&blkcg->lock, flags); |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 586 | |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 587 | return ret; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 588 | } |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 589 | EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 590 | |
| 591 | /* called under rcu_read_lock(). */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 592 | struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, |
| 593 | struct request_queue *q, |
| 594 | enum blkio_policy_id plid) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 595 | { |
| 596 | struct blkio_group *blkg; |
| 597 | struct hlist_node *n; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 598 | |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 599 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) |
| 600 | if (blkg->q == q && blkg->plid == plid) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 601 | return blkg; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 602 | return NULL; |
| 603 | } |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 604 | EXPORT_SYMBOL_GPL(blkg_lookup); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 605 | |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 606 | void blkg_destroy_all(struct request_queue *q) |
| 607 | { |
| 608 | struct blkio_policy_type *pol; |
| 609 | |
| 610 | while (true) { |
| 611 | bool done = true; |
| 612 | |
| 613 | spin_lock(&blkio_list_lock); |
| 614 | spin_lock_irq(q->queue_lock); |
| 615 | |
| 616 | /* |
| 617 | * clear_queue_fn() might return with non-empty group list |
| 618 | * if it raced cgroup removal and lost. cgroup removal is |
| 619 | * guaranteed to make forward progress and retrying after a |
| 620 | * while is enough. This ugliness is scheduled to be |
| 621 | * removed after locking update. |
| 622 | */ |
| 623 | list_for_each_entry(pol, &blkio_list, list) |
| 624 | if (!pol->ops.blkio_clear_queue_fn(q)) |
| 625 | done = false; |
| 626 | |
| 627 | spin_unlock_irq(q->queue_lock); |
| 628 | spin_unlock(&blkio_list_lock); |
| 629 | |
| 630 | if (done) |
| 631 | break; |
| 632 | |
| 633 | msleep(10); /* just some random duration I like */ |
| 634 | } |
| 635 | } |
| 636 | |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame^] | 637 | static void blkg_rcu_free(struct rcu_head *rcu_head) |
| 638 | { |
| 639 | blkg_free(container_of(rcu_head, struct blkio_group, rcu_head)); |
| 640 | } |
| 641 | |
| 642 | void __blkg_release(struct blkio_group *blkg) |
| 643 | { |
| 644 | /* release the extra blkcg reference this blkg has been holding */ |
| 645 | css_put(&blkg->blkcg->css); |
| 646 | |
| 647 | /* |
| 648 | * A group is freed in rcu manner. But having an rcu lock does not |
| 649 | * mean that one can access all the fields of blkg and assume these |
| 650 | * are valid. For example, don't try to follow throtl_data and |
| 651 | * request queue links. |
| 652 | * |
| 653 | * Having a reference to blkg under an rcu allows acess to only |
| 654 | * values local to groups like group stats and group rate limits |
| 655 | */ |
| 656 | call_rcu(&blkg->rcu_head, blkg_rcu_free); |
| 657 | } |
| 658 | EXPORT_SYMBOL_GPL(__blkg_release); |
| 659 | |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 660 | static void blkio_reset_stats_cpu(struct blkio_group *blkg) |
| 661 | { |
| 662 | struct blkio_group_stats_cpu *stats_cpu; |
| 663 | int i, j, k; |
| 664 | /* |
| 665 | * Note: On 64 bit arch this should not be an issue. This has the |
| 666 | * possibility of returning some inconsistent value on 32bit arch |
| 667 | * as 64bit update on 32bit is non atomic. Taking care of this |
| 668 | * corner case makes code very complicated, like sending IPIs to |
| 669 | * cpus, taking care of stats of offline cpus etc. |
| 670 | * |
| 671 | * reset stats is anyway more of a debug feature and this sounds a |
| 672 | * corner case. So I am not complicating the code yet until and |
| 673 | * unless this becomes a real issue. |
| 674 | */ |
| 675 | for_each_possible_cpu(i) { |
| 676 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, i); |
| 677 | stats_cpu->sectors = 0; |
| 678 | for(j = 0; j < BLKIO_STAT_CPU_NR; j++) |
| 679 | for (k = 0; k < BLKIO_STAT_TOTAL; k++) |
| 680 | stats_cpu->stat_arr_cpu[j][k] = 0; |
| 681 | } |
| 682 | } |
| 683 | |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 684 | static int |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 685 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 686 | { |
| 687 | struct blkio_cgroup *blkcg; |
| 688 | struct blkio_group *blkg; |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 689 | struct blkio_group_stats *stats; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 690 | struct hlist_node *n; |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 691 | uint64_t queued[BLKIO_STAT_TOTAL]; |
| 692 | int i; |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 693 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 694 | bool idling, waiting, empty; |
| 695 | unsigned long long now = sched_clock(); |
| 696 | #endif |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 697 | |
| 698 | blkcg = cgroup_to_blkio_cgroup(cgroup); |
| 699 | spin_lock_irq(&blkcg->lock); |
| 700 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
| 701 | spin_lock(&blkg->stats_lock); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 702 | stats = &blkg->stats; |
| 703 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 704 | idling = blkio_blkg_idling(stats); |
| 705 | waiting = blkio_blkg_waiting(stats); |
| 706 | empty = blkio_blkg_empty(stats); |
| 707 | #endif |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 708 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 709 | queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; |
| 710 | memset(stats, 0, sizeof(struct blkio_group_stats)); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 711 | for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 712 | stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; |
| 713 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
| 714 | if (idling) { |
| 715 | blkio_mark_blkg_idling(stats); |
| 716 | stats->start_idle_time = now; |
| 717 | } |
| 718 | if (waiting) { |
| 719 | blkio_mark_blkg_waiting(stats); |
| 720 | stats->start_group_wait_time = now; |
| 721 | } |
| 722 | if (empty) { |
| 723 | blkio_mark_blkg_empty(stats); |
| 724 | stats->start_empty_time = now; |
| 725 | } |
| 726 | #endif |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 727 | spin_unlock(&blkg->stats_lock); |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 728 | |
| 729 | /* Reset Per cpu stats which don't take blkg->stats_lock */ |
| 730 | blkio_reset_stats_cpu(blkg); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 731 | } |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 732 | |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 733 | spin_unlock_irq(&blkcg->lock); |
| 734 | return 0; |
| 735 | } |
| 736 | |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 737 | static void blkio_get_key_name(enum stat_sub_type type, const char *dname, |
| 738 | char *str, int chars_left, bool diskname_only) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 739 | { |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 740 | snprintf(str, chars_left, "%s", dname); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 741 | chars_left -= strlen(str); |
| 742 | if (chars_left <= 0) { |
| 743 | printk(KERN_WARNING |
| 744 | "Possibly incorrect cgroup stat display format"); |
| 745 | return; |
| 746 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 747 | if (diskname_only) |
| 748 | return; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 749 | switch (type) { |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 750 | case BLKIO_STAT_READ: |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 751 | strlcat(str, " Read", chars_left); |
| 752 | break; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 753 | case BLKIO_STAT_WRITE: |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 754 | strlcat(str, " Write", chars_left); |
| 755 | break; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 756 | case BLKIO_STAT_SYNC: |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 757 | strlcat(str, " Sync", chars_left); |
| 758 | break; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 759 | case BLKIO_STAT_ASYNC: |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 760 | strlcat(str, " Async", chars_left); |
| 761 | break; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 762 | case BLKIO_STAT_TOTAL: |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 763 | strlcat(str, " Total", chars_left); |
| 764 | break; |
| 765 | default: |
| 766 | strlcat(str, " Invalid", chars_left); |
| 767 | } |
| 768 | } |
| 769 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 770 | static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 771 | struct cgroup_map_cb *cb, const char *dname) |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 772 | { |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 773 | blkio_get_key_name(0, dname, str, chars_left, true); |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 774 | cb->fill(cb, str, val); |
| 775 | return val; |
| 776 | } |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 777 | |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 778 | |
| 779 | static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg, |
| 780 | enum stat_type_cpu type, enum stat_sub_type sub_type) |
| 781 | { |
| 782 | int cpu; |
| 783 | struct blkio_group_stats_cpu *stats_cpu; |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 784 | u64 val = 0, tval; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 785 | |
| 786 | for_each_possible_cpu(cpu) { |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 787 | unsigned int start; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 788 | stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu); |
| 789 | |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 790 | do { |
| 791 | start = u64_stats_fetch_begin(&stats_cpu->syncp); |
| 792 | if (type == BLKIO_STAT_CPU_SECTORS) |
| 793 | tval = stats_cpu->sectors; |
| 794 | else |
| 795 | tval = stats_cpu->stat_arr_cpu[type][sub_type]; |
| 796 | } while(u64_stats_fetch_retry(&stats_cpu->syncp, start)); |
| 797 | |
| 798 | val += tval; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | return val; |
| 802 | } |
| 803 | |
| 804 | static uint64_t blkio_get_stat_cpu(struct blkio_group *blkg, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 805 | struct cgroup_map_cb *cb, const char *dname, |
| 806 | enum stat_type_cpu type) |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 807 | { |
| 808 | uint64_t disk_total, val; |
| 809 | char key_str[MAX_KEY_LEN]; |
| 810 | enum stat_sub_type sub_type; |
| 811 | |
| 812 | if (type == BLKIO_STAT_CPU_SECTORS) { |
| 813 | val = blkio_read_stat_cpu(blkg, type, 0); |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 814 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, val, cb, |
| 815 | dname); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
| 819 | sub_type++) { |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 820 | blkio_get_key_name(sub_type, dname, key_str, MAX_KEY_LEN, |
| 821 | false); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 822 | val = blkio_read_stat_cpu(blkg, type, sub_type); |
| 823 | cb->fill(cb, key_str, val); |
| 824 | } |
| 825 | |
| 826 | disk_total = blkio_read_stat_cpu(blkg, type, BLKIO_STAT_READ) + |
| 827 | blkio_read_stat_cpu(blkg, type, BLKIO_STAT_WRITE); |
| 828 | |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 829 | blkio_get_key_name(BLKIO_STAT_TOTAL, dname, key_str, MAX_KEY_LEN, |
| 830 | false); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 831 | cb->fill(cb, key_str, disk_total); |
| 832 | return disk_total; |
| 833 | } |
| 834 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 835 | /* This should be called with blkg->stats_lock held */ |
| 836 | static uint64_t blkio_get_stat(struct blkio_group *blkg, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 837 | struct cgroup_map_cb *cb, const char *dname, |
| 838 | enum stat_type type) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 839 | { |
| 840 | uint64_t disk_total; |
| 841 | char key_str[MAX_KEY_LEN]; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 842 | enum stat_sub_type sub_type; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 843 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 844 | if (type == BLKIO_STAT_TIME) |
| 845 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 846 | blkg->stats.time, cb, dname); |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 847 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Justin TerAvest | 167400d | 2011-03-12 16:54:00 +0100 | [diff] [blame] | 848 | if (type == BLKIO_STAT_UNACCOUNTED_TIME) |
| 849 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 850 | blkg->stats.unaccounted_time, cb, dname); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 851 | if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { |
| 852 | uint64_t sum = blkg->stats.avg_queue_size_sum; |
| 853 | uint64_t samples = blkg->stats.avg_queue_size_samples; |
| 854 | if (samples) |
| 855 | do_div(sum, samples); |
| 856 | else |
| 857 | sum = 0; |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 858 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
| 859 | sum, cb, dname); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 860 | } |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 861 | if (type == BLKIO_STAT_GROUP_WAIT_TIME) |
| 862 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 863 | blkg->stats.group_wait_time, cb, dname); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 864 | if (type == BLKIO_STAT_IDLE_TIME) |
| 865 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 866 | blkg->stats.idle_time, cb, dname); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 867 | if (type == BLKIO_STAT_EMPTY_TIME) |
| 868 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 869 | blkg->stats.empty_time, cb, dname); |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 870 | if (type == BLKIO_STAT_DEQUEUE) |
| 871 | return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 872 | blkg->stats.dequeue, cb, dname); |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 873 | #endif |
| 874 | |
| 875 | for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; |
| 876 | sub_type++) { |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 877 | blkio_get_key_name(sub_type, dname, key_str, MAX_KEY_LEN, |
| 878 | false); |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 879 | cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 880 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 881 | disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + |
| 882 | blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 883 | blkio_get_key_name(BLKIO_STAT_TOTAL, dname, key_str, MAX_KEY_LEN, |
| 884 | false); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 885 | cb->fill(cb, key_str, disk_total); |
| 886 | return disk_total; |
| 887 | } |
| 888 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 889 | static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid, |
| 890 | int fileid, struct blkio_cgroup *blkcg) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 891 | { |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 892 | struct gendisk *disk = NULL; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 893 | struct blkio_group *blkg = NULL; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 894 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 895 | unsigned long major, minor; |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 896 | int i = 0, ret = -EINVAL; |
| 897 | int part; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 898 | dev_t dev; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 899 | u64 temp; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 900 | |
| 901 | memset(s, 0, sizeof(s)); |
| 902 | |
| 903 | while ((p = strsep(&buf, " ")) != NULL) { |
| 904 | if (!*p) |
| 905 | continue; |
| 906 | |
| 907 | s[i++] = p; |
| 908 | |
| 909 | /* Prevent from inputing too many things */ |
| 910 | if (i == 3) |
| 911 | break; |
| 912 | } |
| 913 | |
| 914 | if (i != 2) |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 915 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 916 | |
| 917 | p = strsep(&s[0], ":"); |
| 918 | if (p != NULL) |
| 919 | major_s = p; |
| 920 | else |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 921 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 922 | |
| 923 | minor_s = s[0]; |
| 924 | if (!minor_s) |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 925 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 926 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 927 | if (strict_strtoul(major_s, 10, &major)) |
| 928 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 929 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 930 | if (strict_strtoul(minor_s, 10, &minor)) |
| 931 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 932 | |
| 933 | dev = MKDEV(major, minor); |
| 934 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 935 | if (strict_strtoull(s[1], 10, &temp)) |
| 936 | goto out; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 937 | |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 938 | disk = get_gendisk(dev, &part); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 939 | if (!disk || part) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 940 | goto out; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 941 | |
| 942 | rcu_read_lock(); |
| 943 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 944 | spin_lock_irq(disk->queue->queue_lock); |
| 945 | blkg = blkg_lookup_create(blkcg, disk->queue, plid, false); |
| 946 | spin_unlock_irq(disk->queue->queue_lock); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 947 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 948 | if (IS_ERR(blkg)) { |
| 949 | ret = PTR_ERR(blkg); |
| 950 | goto out_unlock; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 951 | } |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 952 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 953 | switch (plid) { |
| 954 | case BLKIO_POLICY_PROP: |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 955 | if ((temp < BLKIO_WEIGHT_MIN && temp > 0) || |
| 956 | temp > BLKIO_WEIGHT_MAX) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 957 | goto out_unlock; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 958 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 959 | blkg->conf.weight = temp; |
| 960 | blkio_update_group_weight(blkg, temp ?: blkcg->weight); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 961 | break; |
| 962 | case BLKIO_POLICY_THROTL: |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 963 | switch(fileid) { |
| 964 | case BLKIO_THROTL_read_bps_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 965 | blkg->conf.bps[READ] = temp; |
| 966 | blkio_update_group_bps(blkg, temp ?: -1, fileid); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 967 | break; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 968 | case BLKIO_THROTL_write_bps_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 969 | blkg->conf.bps[WRITE] = temp; |
| 970 | blkio_update_group_bps(blkg, temp ?: -1, fileid); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 971 | break; |
| 972 | case BLKIO_THROTL_read_iops_device: |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 973 | if (temp > THROTL_IOPS_MAX) |
| 974 | goto out_unlock; |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 975 | blkg->conf.iops[READ] = temp; |
| 976 | blkio_update_group_iops(blkg, temp ?: -1, fileid); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 977 | break; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 978 | case BLKIO_THROTL_write_iops_device: |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 979 | if (temp > THROTL_IOPS_MAX) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 980 | goto out_unlock; |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 981 | blkg->conf.iops[WRITE] = temp; |
| 982 | blkio_update_group_iops(blkg, temp ?: -1, fileid); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 983 | break; |
| 984 | } |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 985 | break; |
| 986 | default: |
| 987 | BUG(); |
| 988 | } |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 989 | ret = 0; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 990 | out_unlock: |
| 991 | rcu_read_unlock(); |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 992 | out: |
| 993 | put_disk(disk); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 994 | |
| 995 | /* |
| 996 | * If queue was bypassing, we should retry. Do so after a short |
| 997 | * msleep(). It isn't strictly necessary but queue can be |
| 998 | * bypassing for some time and it's always nice to avoid busy |
| 999 | * looping. |
| 1000 | */ |
| 1001 | if (ret == -EBUSY) { |
| 1002 | msleep(10); |
| 1003 | return restart_syscall(); |
| 1004 | } |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1005 | return ret; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1006 | } |
| 1007 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1008 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
| 1009 | const char *buffer) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1010 | { |
| 1011 | int ret = 0; |
| 1012 | char *buf; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1013 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1014 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1015 | int fileid = BLKIOFILE_ATTR(cft->private); |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1016 | |
| 1017 | buf = kstrdup(buffer, GFP_KERNEL); |
| 1018 | if (!buf) |
| 1019 | return -ENOMEM; |
| 1020 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1021 | ret = blkio_policy_parse_and_set(buf, plid, fileid, blkcg); |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1022 | kfree(buf); |
| 1023 | return ret; |
| 1024 | } |
| 1025 | |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1026 | static const char *blkg_dev_name(struct blkio_group *blkg) |
| 1027 | { |
| 1028 | /* some drivers (floppy) instantiate a queue w/o disk registered */ |
| 1029 | if (blkg->q->backing_dev_info.dev) |
| 1030 | return dev_name(blkg->q->backing_dev_info.dev); |
| 1031 | return NULL; |
| 1032 | } |
| 1033 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1034 | static void blkio_print_group_conf(struct cftype *cft, struct blkio_group *blkg, |
| 1035 | struct seq_file *m) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1036 | { |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1037 | const char *dname = blkg_dev_name(blkg); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1038 | int fileid = BLKIOFILE_ATTR(cft->private); |
| 1039 | int rw = WRITE; |
| 1040 | |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1041 | if (!dname) |
| 1042 | return; |
| 1043 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1044 | switch (blkg->plid) { |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1045 | case BLKIO_POLICY_PROP: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1046 | if (blkg->conf.weight) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1047 | seq_printf(m, "%s\t%u\n", |
| 1048 | dname, blkg->conf.weight); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1049 | break; |
| 1050 | case BLKIO_POLICY_THROTL: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1051 | switch (fileid) { |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1052 | case BLKIO_THROTL_read_bps_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1053 | rw = READ; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1054 | case BLKIO_THROTL_write_bps_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1055 | if (blkg->conf.bps[rw]) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1056 | seq_printf(m, "%s\t%llu\n", |
| 1057 | dname, blkg->conf.bps[rw]); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1058 | break; |
| 1059 | case BLKIO_THROTL_read_iops_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1060 | rw = READ; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1061 | case BLKIO_THROTL_write_iops_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1062 | if (blkg->conf.iops[rw]) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1063 | seq_printf(m, "%s\t%u\n", |
| 1064 | dname, blkg->conf.iops[rw]); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1065 | break; |
| 1066 | } |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1067 | break; |
| 1068 | default: |
| 1069 | BUG(); |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | /* cgroup files which read their data from policy nodes end up here */ |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1074 | static void blkio_read_conf(struct cftype *cft, struct blkio_cgroup *blkcg, |
| 1075 | struct seq_file *m) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1076 | { |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1077 | struct blkio_group *blkg; |
| 1078 | struct hlist_node *n; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1079 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1080 | spin_lock_irq(&blkcg->lock); |
| 1081 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) |
| 1082 | if (BLKIOFILE_POLICY(cft->private) == blkg->plid) |
| 1083 | blkio_print_group_conf(cft, blkg, m); |
| 1084 | spin_unlock_irq(&blkcg->lock); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1085 | } |
| 1086 | |
| 1087 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, |
| 1088 | struct seq_file *m) |
| 1089 | { |
| 1090 | struct blkio_cgroup *blkcg; |
| 1091 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1092 | int name = BLKIOFILE_ATTR(cft->private); |
| 1093 | |
| 1094 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1095 | |
| 1096 | switch(plid) { |
| 1097 | case BLKIO_POLICY_PROP: |
| 1098 | switch(name) { |
| 1099 | case BLKIO_PROP_weight_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1100 | blkio_read_conf(cft, blkcg, m); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1101 | return 0; |
| 1102 | default: |
| 1103 | BUG(); |
| 1104 | } |
| 1105 | break; |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1106 | case BLKIO_POLICY_THROTL: |
| 1107 | switch(name){ |
| 1108 | case BLKIO_THROTL_read_bps_device: |
| 1109 | case BLKIO_THROTL_write_bps_device: |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1110 | case BLKIO_THROTL_read_iops_device: |
| 1111 | case BLKIO_THROTL_write_iops_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1112 | blkio_read_conf(cft, blkcg, m); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1113 | return 0; |
| 1114 | default: |
| 1115 | BUG(); |
| 1116 | } |
| 1117 | break; |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1118 | default: |
| 1119 | BUG(); |
| 1120 | } |
| 1121 | |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1126 | struct cftype *cft, struct cgroup_map_cb *cb, |
| 1127 | enum stat_type type, bool show_total, bool pcpu) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1128 | { |
| 1129 | struct blkio_group *blkg; |
| 1130 | struct hlist_node *n; |
| 1131 | uint64_t cgroup_total = 0; |
| 1132 | |
| 1133 | rcu_read_lock(); |
| 1134 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1135 | const char *dname = blkg_dev_name(blkg); |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1136 | |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1137 | if (!dname || BLKIOFILE_POLICY(cft->private) != blkg->plid) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1138 | continue; |
| 1139 | if (pcpu) |
| 1140 | cgroup_total += blkio_get_stat_cpu(blkg, cb, dname, |
| 1141 | type); |
| 1142 | else { |
| 1143 | spin_lock_irq(&blkg->stats_lock); |
| 1144 | cgroup_total += blkio_get_stat(blkg, cb, dname, type); |
| 1145 | spin_unlock_irq(&blkg->stats_lock); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1146 | } |
| 1147 | } |
| 1148 | if (show_total) |
| 1149 | cb->fill(cb, "Total", cgroup_total); |
| 1150 | rcu_read_unlock(); |
| 1151 | return 0; |
| 1152 | } |
| 1153 | |
| 1154 | /* All map kind of cgroup file get serviced by this function */ |
| 1155 | static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, |
| 1156 | struct cgroup_map_cb *cb) |
| 1157 | { |
| 1158 | struct blkio_cgroup *blkcg; |
| 1159 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1160 | int name = BLKIOFILE_ATTR(cft->private); |
| 1161 | |
| 1162 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1163 | |
| 1164 | switch(plid) { |
| 1165 | case BLKIO_POLICY_PROP: |
| 1166 | switch(name) { |
| 1167 | case BLKIO_PROP_time: |
| 1168 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1169 | BLKIO_STAT_TIME, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1170 | case BLKIO_PROP_sectors: |
| 1171 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1172 | BLKIO_STAT_CPU_SECTORS, 0, 1); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1173 | case BLKIO_PROP_io_service_bytes: |
| 1174 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1175 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1176 | case BLKIO_PROP_io_serviced: |
| 1177 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1178 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1179 | case BLKIO_PROP_io_service_time: |
| 1180 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1181 | BLKIO_STAT_SERVICE_TIME, 1, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1182 | case BLKIO_PROP_io_wait_time: |
| 1183 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1184 | BLKIO_STAT_WAIT_TIME, 1, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1185 | case BLKIO_PROP_io_merged: |
| 1186 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 317389a | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 1187 | BLKIO_STAT_CPU_MERGED, 1, 1); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1188 | case BLKIO_PROP_io_queued: |
| 1189 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1190 | BLKIO_STAT_QUEUED, 1, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1191 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 1192 | case BLKIO_PROP_unaccounted_time: |
| 1193 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1194 | BLKIO_STAT_UNACCOUNTED_TIME, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1195 | case BLKIO_PROP_dequeue: |
| 1196 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1197 | BLKIO_STAT_DEQUEUE, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1198 | case BLKIO_PROP_avg_queue_size: |
| 1199 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1200 | BLKIO_STAT_AVG_QUEUE_SIZE, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1201 | case BLKIO_PROP_group_wait_time: |
| 1202 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1203 | BLKIO_STAT_GROUP_WAIT_TIME, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1204 | case BLKIO_PROP_idle_time: |
| 1205 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1206 | BLKIO_STAT_IDLE_TIME, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1207 | case BLKIO_PROP_empty_time: |
| 1208 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1209 | BLKIO_STAT_EMPTY_TIME, 0, 0); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1210 | #endif |
| 1211 | default: |
| 1212 | BUG(); |
| 1213 | } |
| 1214 | break; |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1215 | case BLKIO_POLICY_THROTL: |
| 1216 | switch(name){ |
| 1217 | case BLKIO_THROTL_io_service_bytes: |
| 1218 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1219 | BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1220 | case BLKIO_THROTL_io_serviced: |
| 1221 | return blkio_read_blkg_stats(blkcg, cft, cb, |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 1222 | BLKIO_STAT_CPU_SERVICED, 1, 1); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1223 | default: |
| 1224 | BUG(); |
| 1225 | } |
| 1226 | break; |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1227 | default: |
| 1228 | BUG(); |
| 1229 | } |
| 1230 | |
| 1231 | return 0; |
| 1232 | } |
| 1233 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1234 | static int blkio_weight_write(struct blkio_cgroup *blkcg, int plid, u64 val) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1235 | { |
| 1236 | struct blkio_group *blkg; |
| 1237 | struct hlist_node *n; |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1238 | |
| 1239 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) |
| 1240 | return -EINVAL; |
| 1241 | |
| 1242 | spin_lock(&blkio_list_lock); |
| 1243 | spin_lock_irq(&blkcg->lock); |
| 1244 | blkcg->weight = (unsigned int)val; |
| 1245 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1246 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) |
| 1247 | if (blkg->plid == plid && !blkg->conf.weight) |
| 1248 | blkio_update_group_weight(blkg, blkcg->weight); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1249 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1250 | spin_unlock_irq(&blkcg->lock); |
| 1251 | spin_unlock(&blkio_list_lock); |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
| 1255 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { |
| 1256 | struct blkio_cgroup *blkcg; |
| 1257 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1258 | int name = BLKIOFILE_ATTR(cft->private); |
| 1259 | |
| 1260 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1261 | |
| 1262 | switch(plid) { |
| 1263 | case BLKIO_POLICY_PROP: |
| 1264 | switch(name) { |
| 1265 | case BLKIO_PROP_weight: |
| 1266 | return (u64)blkcg->weight; |
| 1267 | } |
| 1268 | break; |
| 1269 | default: |
| 1270 | BUG(); |
| 1271 | } |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | static int |
| 1276 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) |
| 1277 | { |
| 1278 | struct blkio_cgroup *blkcg; |
| 1279 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1280 | int name = BLKIOFILE_ATTR(cft->private); |
| 1281 | |
| 1282 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1283 | |
| 1284 | switch(plid) { |
| 1285 | case BLKIO_POLICY_PROP: |
| 1286 | switch(name) { |
| 1287 | case BLKIO_PROP_weight: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1288 | return blkio_weight_write(blkcg, plid, val); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1289 | } |
| 1290 | break; |
| 1291 | default: |
| 1292 | BUG(); |
| 1293 | } |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1294 | |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1295 | return 0; |
| 1296 | } |
| 1297 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1298 | struct cftype blkio_files[] = { |
| 1299 | { |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1300 | .name = "weight_device", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1301 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1302 | BLKIO_PROP_weight_device), |
| 1303 | .read_seq_string = blkiocg_file_read, |
| 1304 | .write_string = blkiocg_file_write, |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1305 | .max_write_len = 256, |
| 1306 | }, |
| 1307 | { |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1308 | .name = "weight", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1309 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1310 | BLKIO_PROP_weight), |
| 1311 | .read_u64 = blkiocg_file_read_u64, |
| 1312 | .write_u64 = blkiocg_file_write_u64, |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1313 | }, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1314 | { |
| 1315 | .name = "time", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1316 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1317 | BLKIO_PROP_time), |
| 1318 | .read_map = blkiocg_file_read_map, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1319 | }, |
| 1320 | { |
| 1321 | .name = "sectors", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1322 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1323 | BLKIO_PROP_sectors), |
| 1324 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1325 | }, |
| 1326 | { |
| 1327 | .name = "io_service_bytes", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1328 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1329 | BLKIO_PROP_io_service_bytes), |
| 1330 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1331 | }, |
| 1332 | { |
| 1333 | .name = "io_serviced", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1334 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1335 | BLKIO_PROP_io_serviced), |
| 1336 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1337 | }, |
| 1338 | { |
| 1339 | .name = "io_service_time", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1340 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1341 | BLKIO_PROP_io_service_time), |
| 1342 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1343 | }, |
| 1344 | { |
| 1345 | .name = "io_wait_time", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1346 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1347 | BLKIO_PROP_io_wait_time), |
| 1348 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1349 | }, |
| 1350 | { |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 1351 | .name = "io_merged", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1352 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1353 | BLKIO_PROP_io_merged), |
| 1354 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 1355 | }, |
| 1356 | { |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1357 | .name = "io_queued", |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1358 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1359 | BLKIO_PROP_io_queued), |
| 1360 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1361 | }, |
| 1362 | { |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1363 | .name = "reset_stats", |
| 1364 | .write_u64 = blkiocg_reset_stats, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1365 | }, |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1366 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 1367 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1368 | .name = "throttle.read_bps_device", |
| 1369 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1370 | BLKIO_THROTL_read_bps_device), |
| 1371 | .read_seq_string = blkiocg_file_read, |
| 1372 | .write_string = blkiocg_file_write, |
| 1373 | .max_write_len = 256, |
| 1374 | }, |
| 1375 | |
| 1376 | { |
| 1377 | .name = "throttle.write_bps_device", |
| 1378 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1379 | BLKIO_THROTL_write_bps_device), |
| 1380 | .read_seq_string = blkiocg_file_read, |
| 1381 | .write_string = blkiocg_file_write, |
| 1382 | .max_write_len = 256, |
| 1383 | }, |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1384 | |
| 1385 | { |
| 1386 | .name = "throttle.read_iops_device", |
| 1387 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1388 | BLKIO_THROTL_read_iops_device), |
| 1389 | .read_seq_string = blkiocg_file_read, |
| 1390 | .write_string = blkiocg_file_write, |
| 1391 | .max_write_len = 256, |
| 1392 | }, |
| 1393 | |
| 1394 | { |
| 1395 | .name = "throttle.write_iops_device", |
| 1396 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1397 | BLKIO_THROTL_write_iops_device), |
| 1398 | .read_seq_string = blkiocg_file_read, |
| 1399 | .write_string = blkiocg_file_write, |
| 1400 | .max_write_len = 256, |
| 1401 | }, |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1402 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1403 | .name = "throttle.io_service_bytes", |
| 1404 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1405 | BLKIO_THROTL_io_service_bytes), |
| 1406 | .read_map = blkiocg_file_read_map, |
| 1407 | }, |
| 1408 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1409 | .name = "throttle.io_serviced", |
| 1410 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1411 | BLKIO_THROTL_io_serviced), |
| 1412 | .read_map = blkiocg_file_read_map, |
| 1413 | }, |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1414 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
| 1415 | |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1416 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1417 | { |
| 1418 | .name = "avg_queue_size", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1419 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1420 | BLKIO_PROP_avg_queue_size), |
| 1421 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1422 | }, |
| 1423 | { |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1424 | .name = "group_wait_time", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1425 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1426 | BLKIO_PROP_group_wait_time), |
| 1427 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1428 | }, |
| 1429 | { |
| 1430 | .name = "idle_time", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1431 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1432 | BLKIO_PROP_idle_time), |
| 1433 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1434 | }, |
| 1435 | { |
| 1436 | .name = "empty_time", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1437 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1438 | BLKIO_PROP_empty_time), |
| 1439 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1440 | }, |
| 1441 | { |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1442 | .name = "dequeue", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1443 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1444 | BLKIO_PROP_dequeue), |
| 1445 | .read_map = blkiocg_file_read_map, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1446 | }, |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 1447 | { |
| 1448 | .name = "unaccounted_time", |
| 1449 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1450 | BLKIO_PROP_unaccounted_time), |
| 1451 | .read_map = blkiocg_file_read_map, |
| 1452 | }, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1453 | #endif |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1454 | }; |
| 1455 | |
| 1456 | static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
| 1457 | { |
| 1458 | return cgroup_add_files(cgroup, subsys, blkio_files, |
| 1459 | ARRAY_SIZE(blkio_files)); |
| 1460 | } |
| 1461 | |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1462 | static int blkiocg_pre_destroy(struct cgroup_subsys *subsys, |
| 1463 | struct cgroup *cgroup) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1464 | { |
| 1465 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1466 | unsigned long flags; |
| 1467 | struct blkio_group *blkg; |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 1468 | struct request_queue *q; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1469 | struct blkio_policy_type *blkiop; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1470 | |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1471 | rcu_read_lock(); |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1472 | |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1473 | do { |
| 1474 | spin_lock_irqsave(&blkcg->lock, flags); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1475 | |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1476 | if (hlist_empty(&blkcg->blkg_list)) { |
| 1477 | spin_unlock_irqrestore(&blkcg->lock, flags); |
| 1478 | break; |
| 1479 | } |
| 1480 | |
| 1481 | blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, |
| 1482 | blkcg_node); |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 1483 | q = rcu_dereference(blkg->q); |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1484 | __blkiocg_del_blkio_group(blkg); |
| 1485 | |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1486 | spin_unlock_irqrestore(&blkcg->lock, flags); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1487 | |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1488 | /* |
| 1489 | * This blkio_group is being unlinked as associated cgroup is |
| 1490 | * going away. Let all the IO controlling policies know about |
Vivek Goyal | 61014e9 | 2010-10-01 14:49:44 +0200 | [diff] [blame] | 1491 | * this event. |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1492 | */ |
| 1493 | spin_lock(&blkio_list_lock); |
Vivek Goyal | 61014e9 | 2010-10-01 14:49:44 +0200 | [diff] [blame] | 1494 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 1495 | if (blkiop->plid != blkg->plid) |
| 1496 | continue; |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 1497 | blkiop->ops.blkio_unlink_group_fn(q, blkg); |
Vivek Goyal | 61014e9 | 2010-10-01 14:49:44 +0200 | [diff] [blame] | 1498 | } |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1499 | spin_unlock(&blkio_list_lock); |
| 1500 | } while (1); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1501 | |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1502 | rcu_read_unlock(); |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1503 | |
| 1504 | return 0; |
| 1505 | } |
| 1506 | |
| 1507 | static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
| 1508 | { |
| 1509 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
| 1510 | |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 1511 | if (blkcg != &blkio_root_cgroup) |
| 1512 | kfree(blkcg); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1513 | } |
| 1514 | |
| 1515 | static struct cgroup_subsys_state * |
| 1516 | blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) |
| 1517 | { |
Li Zefan | 0341509 | 2010-05-07 08:57:00 +0200 | [diff] [blame] | 1518 | struct blkio_cgroup *blkcg; |
| 1519 | struct cgroup *parent = cgroup->parent; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1520 | |
Li Zefan | 0341509 | 2010-05-07 08:57:00 +0200 | [diff] [blame] | 1521 | if (!parent) { |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1522 | blkcg = &blkio_root_cgroup; |
| 1523 | goto done; |
| 1524 | } |
| 1525 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1526 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
| 1527 | if (!blkcg) |
| 1528 | return ERR_PTR(-ENOMEM); |
| 1529 | |
| 1530 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; |
| 1531 | done: |
| 1532 | spin_lock_init(&blkcg->lock); |
| 1533 | INIT_HLIST_HEAD(&blkcg->blkg_list); |
| 1534 | |
| 1535 | return &blkcg->css; |
| 1536 | } |
| 1537 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1538 | /** |
| 1539 | * blkcg_init_queue - initialize blkcg part of request queue |
| 1540 | * @q: request_queue to initialize |
| 1541 | * |
| 1542 | * Called from blk_alloc_queue_node(). Responsible for initializing blkcg |
| 1543 | * part of new request_queue @q. |
| 1544 | * |
| 1545 | * RETURNS: |
| 1546 | * 0 on success, -errno on failure. |
| 1547 | */ |
| 1548 | int blkcg_init_queue(struct request_queue *q) |
| 1549 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1550 | int ret; |
| 1551 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1552 | might_sleep(); |
| 1553 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1554 | ret = blk_throtl_init(q); |
| 1555 | if (ret) |
| 1556 | return ret; |
| 1557 | |
| 1558 | mutex_lock(&all_q_mutex); |
| 1559 | INIT_LIST_HEAD(&q->all_q_node); |
| 1560 | list_add_tail(&q->all_q_node, &all_q_list); |
| 1561 | mutex_unlock(&all_q_mutex); |
| 1562 | |
| 1563 | return 0; |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1564 | } |
| 1565 | |
| 1566 | /** |
| 1567 | * blkcg_drain_queue - drain blkcg part of request_queue |
| 1568 | * @q: request_queue to drain |
| 1569 | * |
| 1570 | * Called from blk_drain_queue(). Responsible for draining blkcg part. |
| 1571 | */ |
| 1572 | void blkcg_drain_queue(struct request_queue *q) |
| 1573 | { |
| 1574 | lockdep_assert_held(q->queue_lock); |
| 1575 | |
| 1576 | blk_throtl_drain(q); |
| 1577 | } |
| 1578 | |
| 1579 | /** |
| 1580 | * blkcg_exit_queue - exit and release blkcg part of request_queue |
| 1581 | * @q: request_queue being released |
| 1582 | * |
| 1583 | * Called from blk_release_queue(). Responsible for exiting blkcg part. |
| 1584 | */ |
| 1585 | void blkcg_exit_queue(struct request_queue *q) |
| 1586 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1587 | mutex_lock(&all_q_mutex); |
| 1588 | list_del_init(&q->all_q_node); |
| 1589 | mutex_unlock(&all_q_mutex); |
| 1590 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1591 | blk_throtl_exit(q); |
| 1592 | } |
| 1593 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1594 | /* |
| 1595 | * We cannot support shared io contexts, as we have no mean to support |
| 1596 | * two tasks with the same ioc in two different groups without major rework |
| 1597 | * of the main cic data structures. For now we allow a task to change |
| 1598 | * its cgroup only if it's the only owner of its ioc. |
| 1599 | */ |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1600 | static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, |
| 1601 | struct cgroup_taskset *tset) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1602 | { |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1603 | struct task_struct *task; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1604 | struct io_context *ioc; |
| 1605 | int ret = 0; |
| 1606 | |
| 1607 | /* task_lock() is needed to avoid races with exit_io_context() */ |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1608 | cgroup_taskset_for_each(task, cgrp, tset) { |
| 1609 | task_lock(task); |
| 1610 | ioc = task->io_context; |
| 1611 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) |
| 1612 | ret = -EINVAL; |
| 1613 | task_unlock(task); |
| 1614 | if (ret) |
| 1615 | break; |
| 1616 | } |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1617 | return ret; |
| 1618 | } |
| 1619 | |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1620 | static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp, |
| 1621 | struct cgroup_taskset *tset) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1622 | { |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1623 | struct task_struct *task; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1624 | struct io_context *ioc; |
| 1625 | |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1626 | cgroup_taskset_for_each(task, cgrp, tset) { |
Linus Torvalds | b3c9dd1 | 2012-01-15 12:24:45 -0800 | [diff] [blame] | 1627 | /* we don't lose anything even if ioc allocation fails */ |
| 1628 | ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE); |
| 1629 | if (ioc) { |
| 1630 | ioc_cgroup_changed(ioc); |
Tejun Heo | 11a3122 | 2012-02-07 07:51:30 +0100 | [diff] [blame] | 1631 | put_io_context(ioc); |
Linus Torvalds | b3c9dd1 | 2012-01-15 12:24:45 -0800 | [diff] [blame] | 1632 | } |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1633 | } |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1634 | } |
| 1635 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1636 | static void blkcg_bypass_start(void) |
| 1637 | __acquires(&all_q_mutex) |
| 1638 | { |
| 1639 | struct request_queue *q; |
| 1640 | |
| 1641 | mutex_lock(&all_q_mutex); |
| 1642 | |
| 1643 | list_for_each_entry(q, &all_q_list, all_q_node) { |
| 1644 | blk_queue_bypass_start(q); |
| 1645 | blkg_destroy_all(q); |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | static void blkcg_bypass_end(void) |
| 1650 | __releases(&all_q_mutex) |
| 1651 | { |
| 1652 | struct request_queue *q; |
| 1653 | |
| 1654 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 1655 | blk_queue_bypass_end(q); |
| 1656 | |
| 1657 | mutex_unlock(&all_q_mutex); |
| 1658 | } |
| 1659 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1660 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
| 1661 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1662 | blkcg_bypass_start(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1663 | spin_lock(&blkio_list_lock); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1664 | |
| 1665 | BUG_ON(blkio_policy[blkiop->plid]); |
| 1666 | blkio_policy[blkiop->plid] = blkiop; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1667 | list_add_tail(&blkiop->list, &blkio_list); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1668 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1669 | spin_unlock(&blkio_list_lock); |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1670 | blkcg_bypass_end(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1671 | } |
| 1672 | EXPORT_SYMBOL_GPL(blkio_policy_register); |
| 1673 | |
| 1674 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) |
| 1675 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1676 | blkcg_bypass_start(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1677 | spin_lock(&blkio_list_lock); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1678 | |
| 1679 | BUG_ON(blkio_policy[blkiop->plid] != blkiop); |
| 1680 | blkio_policy[blkiop->plid] = NULL; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1681 | list_del_init(&blkiop->list); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1682 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1683 | spin_unlock(&blkio_list_lock); |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1684 | blkcg_bypass_end(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1685 | } |
| 1686 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); |