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> |
Tejun Heo | 9a9e8a2 | 2012-03-19 15:10:56 -0700 | [diff] [blame] | 22 | #include <linux/atomic.h> |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 23 | #include "blk-cgroup.h" |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 24 | #include "blk.h" |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 25 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 26 | #define MAX_KEY_LEN 100 |
| 27 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 28 | static DEFINE_SPINLOCK(blkio_list_lock); |
| 29 | static LIST_HEAD(blkio_list); |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 30 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 31 | static DEFINE_MUTEX(all_q_mutex); |
| 32 | static LIST_HEAD(all_q_list); |
| 33 | |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 34 | /* List of groups pending per cpu stats allocation */ |
| 35 | static DEFINE_SPINLOCK(alloc_list_lock); |
| 36 | static LIST_HEAD(alloc_list); |
| 37 | |
| 38 | static void blkio_stat_alloc_fn(struct work_struct *); |
| 39 | static DECLARE_DELAYED_WORK(blkio_stat_alloc_work, blkio_stat_alloc_fn); |
| 40 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 41 | struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 42 | EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
| 43 | |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 44 | static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES]; |
| 45 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 46 | /* for encoding cft->private value on file */ |
| 47 | #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 48 | /* What policy owns the file, proportional or throttle */ |
| 49 | #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) |
| 50 | #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
| 51 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 52 | struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) |
| 53 | { |
| 54 | return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), |
| 55 | struct blkio_cgroup, css); |
| 56 | } |
Vivek Goyal | 9d6a986 | 2009-12-04 10:36:41 -0500 | [diff] [blame] | 57 | EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 58 | |
Tejun Heo | 4f85cb9 | 2012-03-05 13:15:28 -0800 | [diff] [blame] | 59 | static struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) |
Vivek Goyal | 70087dc | 2011-05-16 15:24:08 +0200 | [diff] [blame] | 60 | { |
| 61 | return container_of(task_subsys_state(tsk, blkio_subsys_id), |
| 62 | struct blkio_cgroup, css); |
| 63 | } |
Tejun Heo | 4f85cb9 | 2012-03-05 13:15:28 -0800 | [diff] [blame] | 64 | |
| 65 | struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio) |
| 66 | { |
| 67 | if (bio && bio->bi_css) |
| 68 | return container_of(bio->bi_css, struct blkio_cgroup, css); |
| 69 | return task_blkio_cgroup(current); |
| 70 | } |
| 71 | EXPORT_SYMBOL_GPL(bio_blkio_cgroup); |
Vivek Goyal | 70087dc | 2011-05-16 15:24:08 +0200 | [diff] [blame] | 72 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 73 | static inline void blkio_update_group_weight(struct blkio_group *blkg, |
| 74 | int plid, unsigned int weight) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 75 | { |
| 76 | struct blkio_policy_type *blkiop; |
| 77 | |
| 78 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 79 | /* If this policy does not own the blkg, do not send updates */ |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 80 | if (blkiop->plid != plid) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 81 | continue; |
| 82 | if (blkiop->ops.blkio_update_group_weight_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 83 | blkiop->ops.blkio_update_group_weight_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 84 | blkg, weight); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 85 | } |
| 86 | } |
| 87 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 88 | static inline void blkio_update_group_bps(struct blkio_group *blkg, int plid, |
| 89 | u64 bps, int fileid) |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 90 | { |
| 91 | struct blkio_policy_type *blkiop; |
| 92 | |
| 93 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 94 | |
| 95 | /* If this policy does not own the blkg, do not send updates */ |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 96 | if (blkiop->plid != plid) |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 97 | continue; |
| 98 | |
| 99 | if (fileid == BLKIO_THROTL_read_bps_device |
| 100 | && blkiop->ops.blkio_update_group_read_bps_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 101 | blkiop->ops.blkio_update_group_read_bps_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 102 | blkg, bps); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 103 | |
| 104 | if (fileid == BLKIO_THROTL_write_bps_device |
| 105 | && blkiop->ops.blkio_update_group_write_bps_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 106 | blkiop->ops.blkio_update_group_write_bps_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 107 | blkg, bps); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 108 | } |
| 109 | } |
| 110 | |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 111 | static inline void blkio_update_group_iops(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 112 | int plid, unsigned int iops, |
| 113 | int fileid) |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 114 | { |
| 115 | struct blkio_policy_type *blkiop; |
| 116 | |
| 117 | list_for_each_entry(blkiop, &blkio_list, list) { |
| 118 | |
| 119 | /* If this policy does not own the blkg, do not send updates */ |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 120 | if (blkiop->plid != plid) |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 121 | continue; |
| 122 | |
| 123 | if (fileid == BLKIO_THROTL_read_iops_device |
| 124 | && blkiop->ops.blkio_update_group_read_iops_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 125 | blkiop->ops.blkio_update_group_read_iops_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 126 | blkg, iops); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 127 | |
| 128 | if (fileid == BLKIO_THROTL_write_iops_device |
| 129 | && blkiop->ops.blkio_update_group_write_iops_fn) |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 130 | blkiop->ops.blkio_update_group_write_iops_fn(blkg->q, |
Vivek Goyal | fe07143 | 2010-10-01 14:49:49 +0200 | [diff] [blame] | 131 | blkg,iops); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 132 | } |
| 133 | } |
| 134 | |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 135 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 136 | /* This should be called with the queue_lock held. */ |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 137 | static void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 138 | struct blkio_policy_type *pol, |
| 139 | struct blkio_group *curr_blkg) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 140 | { |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 141 | struct blkg_policy_data *pd = blkg->pd[pol->plid]; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 142 | |
| 143 | if (blkio_blkg_waiting(&pd->stats)) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 144 | return; |
| 145 | if (blkg == curr_blkg) |
| 146 | return; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 147 | pd->stats.start_group_wait_time = sched_clock(); |
| 148 | blkio_mark_blkg_waiting(&pd->stats); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 151 | /* This should be called with the queue_lock held. */ |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 152 | static void blkio_update_group_wait_time(struct blkio_group_stats *stats) |
| 153 | { |
| 154 | unsigned long long now; |
| 155 | |
| 156 | if (!blkio_blkg_waiting(stats)) |
| 157 | return; |
| 158 | |
| 159 | now = sched_clock(); |
| 160 | if (time_after64(now, stats->start_group_wait_time)) |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 161 | blkg_stat_add(&stats->group_wait_time, |
| 162 | now - stats->start_group_wait_time); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 163 | blkio_clear_blkg_waiting(stats); |
| 164 | } |
| 165 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 166 | /* This should be called with the queue_lock held. */ |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 167 | static void blkio_end_empty_time(struct blkio_group_stats *stats) |
| 168 | { |
| 169 | unsigned long long now; |
| 170 | |
| 171 | if (!blkio_blkg_empty(stats)) |
| 172 | return; |
| 173 | |
| 174 | now = sched_clock(); |
| 175 | if (time_after64(now, stats->start_empty_time)) |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 176 | blkg_stat_add(&stats->empty_time, |
| 177 | now - stats->start_empty_time); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 178 | blkio_clear_blkg_empty(stats); |
| 179 | } |
| 180 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 181 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg, |
| 182 | struct blkio_policy_type *pol) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 183 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 184 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 185 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 186 | lockdep_assert_held(blkg->q->queue_lock); |
| 187 | BUG_ON(blkio_blkg_idling(stats)); |
| 188 | |
| 189 | stats->start_idle_time = sched_clock(); |
| 190 | blkio_mark_blkg_idling(stats); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 191 | } |
| 192 | EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); |
| 193 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 194 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg, |
| 195 | struct blkio_policy_type *pol) |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 196 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 197 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 198 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 199 | lockdep_assert_held(blkg->q->queue_lock); |
| 200 | |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 201 | if (blkio_blkg_idling(stats)) { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 202 | unsigned long long now = sched_clock(); |
| 203 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 204 | if (time_after64(now, stats->start_idle_time)) |
| 205 | blkg_stat_add(&stats->idle_time, |
| 206 | now - stats->start_idle_time); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 207 | blkio_clear_blkg_idling(stats); |
| 208 | } |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 209 | } |
| 210 | EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
| 211 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 212 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg, |
| 213 | struct blkio_policy_type *pol) |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 214 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 215 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 216 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 217 | lockdep_assert_held(blkg->q->queue_lock); |
| 218 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 219 | blkg_stat_add(&stats->avg_queue_size_sum, |
| 220 | blkg_rwstat_sum(&stats->queued)); |
| 221 | blkg_stat_add(&stats->avg_queue_size_samples, 1); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 222 | blkio_update_group_wait_time(stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 223 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 224 | EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
| 225 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 226 | void blkiocg_set_start_empty_time(struct blkio_group *blkg, |
| 227 | struct blkio_policy_type *pol) |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 228 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 229 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 230 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 231 | lockdep_assert_held(blkg->q->queue_lock); |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 232 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 233 | if (blkg_rwstat_sum(&stats->queued)) |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 234 | return; |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 235 | |
| 236 | /* |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 237 | * group is already marked empty. This can happen if cfqq got new |
| 238 | * request in parent group and moved to this group while being added |
| 239 | * to service tree. Just ignore the event and move on. |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 240 | */ |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 241 | if (blkio_blkg_empty(stats)) |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 242 | return; |
Vivek Goyal | e5ff082 | 2010-04-26 19:25:11 +0200 | [diff] [blame] | 243 | |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 244 | stats->start_empty_time = sched_clock(); |
| 245 | blkio_mark_blkg_empty(stats); |
Divyesh Shah | 28baf44 | 2010-04-14 11:22:38 +0200 | [diff] [blame] | 246 | } |
| 247 | EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
| 248 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 249 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 250 | struct blkio_policy_type *pol, |
| 251 | unsigned long dequeue) |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 252 | { |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 253 | struct blkg_policy_data *pd = blkg->pd[pol->plid]; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 254 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 255 | lockdep_assert_held(blkg->q->queue_lock); |
| 256 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 257 | blkg_stat_add(&pd->stats.dequeue, dequeue); |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 258 | } |
| 259 | EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 260 | #else |
| 261 | static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 262 | struct blkio_policy_type *pol, |
| 263 | struct blkio_group *curr_blkg) { } |
| 264 | static inline void blkio_end_empty_time(struct blkio_group_stats *stats) { } |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 265 | #endif |
| 266 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 267 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 268 | struct blkio_policy_type *pol, |
| 269 | struct blkio_group *curr_blkg, bool direction, |
| 270 | bool sync) |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 271 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 272 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 273 | int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 274 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 275 | lockdep_assert_held(blkg->q->queue_lock); |
| 276 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 277 | blkg_rwstat_add(&stats->queued, rw, 1); |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 278 | blkio_end_empty_time(stats); |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 279 | blkio_set_start_group_wait_time(blkg, pol, curr_blkg); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 280 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 281 | EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 282 | |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 283 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 284 | struct blkio_policy_type *pol, |
| 285 | bool direction, bool sync) |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 286 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 287 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 288 | int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 289 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 290 | lockdep_assert_held(blkg->q->queue_lock); |
| 291 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 292 | blkg_rwstat_add(&stats->queued, rw, -1); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 293 | } |
Divyesh Shah | a11cdaa | 2010-04-13 19:59:17 +0200 | [diff] [blame] | 294 | EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 295 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 296 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
| 297 | struct blkio_policy_type *pol, |
| 298 | unsigned long time, |
| 299 | unsigned long unaccounted_time) |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 300 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 301 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 302 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 303 | lockdep_assert_held(blkg->q->queue_lock); |
| 304 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 305 | blkg_stat_add(&stats->time, time); |
Vivek Goyal | a23e686 | 2011-05-19 15:38:20 -0400 | [diff] [blame] | 306 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 307 | blkg_stat_add(&stats->unaccounted_time, unaccounted_time); |
Vivek Goyal | a23e686 | 2011-05-19 15:38:20 -0400 | [diff] [blame] | 308 | #endif |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 309 | } |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 310 | EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 311 | |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 312 | /* |
| 313 | * should be called under rcu read lock or queue lock to make sure blkg pointer |
| 314 | * is valid. |
| 315 | */ |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 316 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 317 | struct blkio_policy_type *pol, |
| 318 | uint64_t bytes, bool direction, bool sync) |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 319 | { |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 320 | int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 321 | struct blkg_policy_data *pd = blkg->pd[pol->plid]; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 322 | struct blkio_group_stats_cpu *stats_cpu; |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 323 | unsigned long flags; |
| 324 | |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 325 | /* If per cpu stats are not allocated yet, don't do any accounting. */ |
| 326 | if (pd->stats_cpu == NULL) |
| 327 | return; |
| 328 | |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 329 | /* |
| 330 | * Disabling interrupts to provide mutual exclusion between two |
| 331 | * writes on same cpu. It probably is not needed for 64bit. Not |
| 332 | * optimizing that case yet. |
| 333 | */ |
| 334 | local_irq_save(flags); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 335 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 336 | stats_cpu = this_cpu_ptr(pd->stats_cpu); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 337 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 338 | blkg_stat_add(&stats_cpu->sectors, bytes >> 9); |
| 339 | blkg_rwstat_add(&stats_cpu->serviced, rw, 1); |
| 340 | blkg_rwstat_add(&stats_cpu->service_bytes, rw, bytes); |
| 341 | |
Vivek Goyal | 575969a | 2011-05-19 15:38:29 -0400 | [diff] [blame] | 342 | local_irq_restore(flags); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 343 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 344 | EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 345 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 346 | void blkiocg_update_completion_stats(struct blkio_group *blkg, |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 347 | struct blkio_policy_type *pol, |
| 348 | uint64_t start_time, |
| 349 | uint64_t io_start_time, bool direction, |
| 350 | bool sync) |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 351 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 352 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 353 | unsigned long long now = sched_clock(); |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 354 | int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 355 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 356 | lockdep_assert_held(blkg->q->queue_lock); |
| 357 | |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 358 | if (time_after64(now, io_start_time)) |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 359 | blkg_rwstat_add(&stats->service_time, rw, now - io_start_time); |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 360 | if (time_after64(io_start_time, start_time)) |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 361 | blkg_rwstat_add(&stats->wait_time, rw, |
| 362 | io_start_time - start_time); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 363 | } |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 364 | EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
Divyesh Shah | 9195291 | 2010-04-01 15:01:41 -0700 | [diff] [blame] | 365 | |
Vivek Goyal | 317389a | 2011-05-23 10:02:19 +0200 | [diff] [blame] | 366 | /* Merged stats are per cpu. */ |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 367 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, |
| 368 | struct blkio_policy_type *pol, |
| 369 | bool direction, bool sync) |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 370 | { |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 371 | struct blkio_group_stats *stats = &blkg->pd[pol->plid]->stats; |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 372 | int rw = (direction ? REQ_WRITE : 0) | (sync ? REQ_SYNC : 0); |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 373 | |
Tejun Heo | edf1b87 | 2012-03-08 10:54:00 -0800 | [diff] [blame] | 374 | lockdep_assert_held(blkg->q->queue_lock); |
| 375 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 376 | blkg_rwstat_add(&stats->merged, rw, 1); |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 377 | } |
| 378 | EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
| 379 | |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 380 | /* |
| 381 | * Worker for allocating per cpu stat for blk groups. This is scheduled on |
| 382 | * the system_nrt_wq once there are some groups on the alloc_list waiting |
| 383 | * for allocation. |
| 384 | */ |
| 385 | static void blkio_stat_alloc_fn(struct work_struct *work) |
| 386 | { |
| 387 | static void *pcpu_stats[BLKIO_NR_POLICIES]; |
| 388 | struct delayed_work *dwork = to_delayed_work(work); |
| 389 | struct blkio_group *blkg; |
| 390 | int i; |
| 391 | bool empty = false; |
| 392 | |
| 393 | alloc_stats: |
| 394 | for (i = 0; i < BLKIO_NR_POLICIES; i++) { |
| 395 | if (pcpu_stats[i] != NULL) |
| 396 | continue; |
| 397 | |
| 398 | pcpu_stats[i] = alloc_percpu(struct blkio_group_stats_cpu); |
| 399 | |
| 400 | /* Allocation failed. Try again after some time. */ |
| 401 | if (pcpu_stats[i] == NULL) { |
| 402 | queue_delayed_work(system_nrt_wq, dwork, |
| 403 | msecs_to_jiffies(10)); |
| 404 | return; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | spin_lock_irq(&blkio_list_lock); |
| 409 | spin_lock(&alloc_list_lock); |
| 410 | |
| 411 | /* cgroup got deleted or queue exited. */ |
| 412 | if (!list_empty(&alloc_list)) { |
| 413 | blkg = list_first_entry(&alloc_list, struct blkio_group, |
| 414 | alloc_node); |
| 415 | for (i = 0; i < BLKIO_NR_POLICIES; i++) { |
| 416 | struct blkg_policy_data *pd = blkg->pd[i]; |
| 417 | |
| 418 | if (blkio_policy[i] && pd && !pd->stats_cpu) |
| 419 | swap(pd->stats_cpu, pcpu_stats[i]); |
| 420 | } |
| 421 | |
| 422 | list_del_init(&blkg->alloc_node); |
| 423 | } |
| 424 | |
| 425 | empty = list_empty(&alloc_list); |
| 426 | |
| 427 | spin_unlock(&alloc_list_lock); |
| 428 | spin_unlock_irq(&blkio_list_lock); |
| 429 | |
| 430 | if (!empty) |
| 431 | goto alloc_stats; |
| 432 | } |
| 433 | |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 434 | /** |
| 435 | * blkg_free - free a blkg |
| 436 | * @blkg: blkg to free |
| 437 | * |
| 438 | * Free @blkg which may be partially allocated. |
| 439 | */ |
| 440 | static void blkg_free(struct blkio_group *blkg) |
| 441 | { |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 442 | int i; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 443 | |
| 444 | if (!blkg) |
| 445 | return; |
| 446 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 447 | for (i = 0; i < BLKIO_NR_POLICIES; i++) { |
| 448 | struct blkg_policy_data *pd = blkg->pd[i]; |
| 449 | |
| 450 | if (pd) { |
| 451 | free_percpu(pd->stats_cpu); |
| 452 | kfree(pd); |
| 453 | } |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 454 | } |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 455 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 456 | kfree(blkg); |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | /** |
| 460 | * blkg_alloc - allocate a blkg |
| 461 | * @blkcg: block cgroup the new blkg is associated with |
| 462 | * @q: request_queue the new blkg is associated with |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 463 | * |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 464 | * Allocate a new blkg assocating @blkcg and @q. |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 465 | */ |
| 466 | static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg, |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 467 | struct request_queue *q) |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 468 | { |
| 469 | struct blkio_group *blkg; |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 470 | int i; |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 471 | |
| 472 | /* alloc and init base part */ |
| 473 | blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node); |
| 474 | if (!blkg) |
| 475 | return NULL; |
| 476 | |
Tejun Heo | c875f4d | 2012-03-05 13:15:22 -0800 | [diff] [blame] | 477 | blkg->q = q; |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 478 | INIT_LIST_HEAD(&blkg->q_node); |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 479 | INIT_LIST_HEAD(&blkg->alloc_node); |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 480 | blkg->blkcg = blkcg; |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame] | 481 | blkg->refcnt = 1; |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 482 | cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
| 483 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 484 | for (i = 0; i < BLKIO_NR_POLICIES; i++) { |
| 485 | struct blkio_policy_type *pol = blkio_policy[i]; |
| 486 | struct blkg_policy_data *pd; |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 487 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 488 | if (!pol) |
| 489 | continue; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 490 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 491 | /* alloc per-policy data and attach it to blkg */ |
| 492 | pd = kzalloc_node(sizeof(*pd) + pol->pdata_size, GFP_ATOMIC, |
| 493 | q->node); |
| 494 | if (!pd) { |
| 495 | blkg_free(blkg); |
| 496 | return NULL; |
| 497 | } |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 498 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 499 | blkg->pd[i] = pd; |
| 500 | pd->blkg = blkg; |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 501 | } |
| 502 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 503 | /* invoke per-policy init */ |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 504 | for (i = 0; i < BLKIO_NR_POLICIES; i++) { |
| 505 | struct blkio_policy_type *pol = blkio_policy[i]; |
| 506 | |
| 507 | if (pol) |
| 508 | pol->ops.blkio_init_group_fn(blkg); |
| 509 | } |
| 510 | |
Tejun Heo | 0381411 | 2012-03-05 13:15:14 -0800 | [diff] [blame] | 511 | return blkg; |
| 512 | } |
| 513 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 514 | struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg, |
| 515 | struct request_queue *q, |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 516 | bool for_root) |
| 517 | __releases(q->queue_lock) __acquires(q->queue_lock) |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 518 | { |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 519 | struct blkio_group *blkg; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 520 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 521 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 522 | lockdep_assert_held(q->queue_lock); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 523 | |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 524 | /* |
| 525 | * This could be the first entry point of blkcg implementation and |
| 526 | * we shouldn't allow anything to go through for a bypassing queue. |
| 527 | * The following can be removed if blkg lookup is guaranteed to |
| 528 | * fail on a bypassing queue. |
| 529 | */ |
| 530 | if (unlikely(blk_queue_bypass(q)) && !for_root) |
| 531 | return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY); |
| 532 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 533 | blkg = blkg_lookup(blkcg, q); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 534 | if (blkg) |
| 535 | return blkg; |
| 536 | |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 537 | /* blkg holds a reference to blkcg */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 538 | if (!css_tryget(&blkcg->css)) |
| 539 | return ERR_PTR(-EINVAL); |
| 540 | |
| 541 | /* |
| 542 | * Allocate and initialize. |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 543 | */ |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 544 | blkg = blkg_alloc(blkcg, q); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 545 | |
| 546 | /* did alloc fail? */ |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 547 | if (unlikely(!blkg)) { |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 548 | blkg = ERR_PTR(-ENOMEM); |
| 549 | goto out; |
| 550 | } |
| 551 | |
| 552 | /* insert */ |
| 553 | spin_lock(&blkcg->lock); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 554 | hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 555 | list_add(&blkg->q_node, &q->blkg_list); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 556 | spin_unlock(&blkcg->lock); |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 557 | |
| 558 | spin_lock(&alloc_list_lock); |
| 559 | list_add(&blkg->alloc_node, &alloc_list); |
| 560 | /* Queue per cpu stat allocation from worker thread. */ |
| 561 | queue_delayed_work(system_nrt_wq, &blkio_stat_alloc_work, 0); |
| 562 | spin_unlock(&alloc_list_lock); |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 563 | out: |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 564 | return blkg; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 565 | } |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 566 | EXPORT_SYMBOL_GPL(blkg_lookup_create); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 567 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 568 | /* called under rcu_read_lock(). */ |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 569 | struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg, |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 570 | struct request_queue *q) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 571 | { |
| 572 | struct blkio_group *blkg; |
| 573 | struct hlist_node *n; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 574 | |
Tejun Heo | ca32aef | 2012-03-05 13:15:03 -0800 | [diff] [blame] | 575 | hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 576 | if (blkg->q == q) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 577 | return blkg; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 578 | return NULL; |
| 579 | } |
Tejun Heo | cd1604f | 2012-03-05 13:15:06 -0800 | [diff] [blame] | 580 | EXPORT_SYMBOL_GPL(blkg_lookup); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 581 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 582 | static void blkg_destroy(struct blkio_group *blkg) |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 583 | { |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 584 | struct request_queue *q = blkg->q; |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 585 | struct blkio_cgroup *blkcg = blkg->blkcg; |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 586 | |
| 587 | lockdep_assert_held(q->queue_lock); |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 588 | lockdep_assert_held(&blkcg->lock); |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 589 | |
| 590 | /* Something wrong if we are trying to remove same group twice */ |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 591 | WARN_ON_ONCE(list_empty(&blkg->q_node)); |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 592 | WARN_ON_ONCE(hlist_unhashed(&blkg->blkcg_node)); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 593 | list_del_init(&blkg->q_node); |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 594 | hlist_del_init_rcu(&blkg->blkcg_node); |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 595 | |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 596 | spin_lock(&alloc_list_lock); |
| 597 | list_del_init(&blkg->alloc_node); |
| 598 | spin_unlock(&alloc_list_lock); |
| 599 | |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 600 | /* |
| 601 | * Put the reference taken at the time of creation so that when all |
| 602 | * queues are gone, group can be destroyed. |
| 603 | */ |
| 604 | blkg_put(blkg); |
| 605 | } |
| 606 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 607 | /* |
| 608 | * XXX: This updates blkg policy data in-place for root blkg, which is |
| 609 | * necessary across elevator switch and policy registration as root blkgs |
| 610 | * aren't shot down. This broken and racy implementation is temporary. |
| 611 | * Eventually, blkg shoot down will be replaced by proper in-place update. |
| 612 | */ |
| 613 | void update_root_blkg_pd(struct request_queue *q, enum blkio_policy_id plid) |
| 614 | { |
| 615 | struct blkio_policy_type *pol = blkio_policy[plid]; |
| 616 | struct blkio_group *blkg = blkg_lookup(&blkio_root_cgroup, q); |
| 617 | struct blkg_policy_data *pd; |
| 618 | |
| 619 | if (!blkg) |
| 620 | return; |
| 621 | |
| 622 | kfree(blkg->pd[plid]); |
| 623 | blkg->pd[plid] = NULL; |
| 624 | |
| 625 | if (!pol) |
| 626 | return; |
| 627 | |
| 628 | pd = kzalloc(sizeof(*pd) + pol->pdata_size, GFP_KERNEL); |
| 629 | WARN_ON_ONCE(!pd); |
| 630 | |
| 631 | pd->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu); |
| 632 | WARN_ON_ONCE(!pd->stats_cpu); |
| 633 | |
| 634 | blkg->pd[plid] = pd; |
| 635 | pd->blkg = blkg; |
| 636 | pol->ops.blkio_init_group_fn(blkg); |
| 637 | } |
| 638 | EXPORT_SYMBOL_GPL(update_root_blkg_pd); |
| 639 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 640 | /** |
| 641 | * blkg_destroy_all - destroy all blkgs associated with a request_queue |
| 642 | * @q: request_queue of interest |
| 643 | * @destroy_root: whether to destroy root blkg or not |
| 644 | * |
| 645 | * Destroy blkgs associated with @q. If @destroy_root is %true, all are |
| 646 | * destroyed; otherwise, root blkg is left alone. |
| 647 | */ |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 648 | void blkg_destroy_all(struct request_queue *q, bool destroy_root) |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 649 | { |
| 650 | struct blkio_group *blkg, *n; |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 651 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 652 | spin_lock_irq(q->queue_lock); |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 653 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 654 | list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) { |
| 655 | struct blkio_cgroup *blkcg = blkg->blkcg; |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 656 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 657 | /* skip root? */ |
| 658 | if (!destroy_root && blkg->blkcg == &blkio_root_cgroup) |
| 659 | continue; |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 660 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 661 | spin_lock(&blkcg->lock); |
| 662 | blkg_destroy(blkg); |
| 663 | spin_unlock(&blkcg->lock); |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 664 | } |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 665 | |
| 666 | spin_unlock_irq(q->queue_lock); |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 667 | } |
Tejun Heo | 03aa264 | 2012-03-05 13:15:19 -0800 | [diff] [blame] | 668 | EXPORT_SYMBOL_GPL(blkg_destroy_all); |
Tejun Heo | 72e06c2 | 2012-03-05 13:15:00 -0800 | [diff] [blame] | 669 | |
Tejun Heo | 1adaf3d | 2012-03-05 13:15:15 -0800 | [diff] [blame] | 670 | static void blkg_rcu_free(struct rcu_head *rcu_head) |
| 671 | { |
| 672 | blkg_free(container_of(rcu_head, struct blkio_group, rcu_head)); |
| 673 | } |
| 674 | |
| 675 | void __blkg_release(struct blkio_group *blkg) |
| 676 | { |
| 677 | /* release the extra blkcg reference this blkg has been holding */ |
| 678 | css_put(&blkg->blkcg->css); |
| 679 | |
| 680 | /* |
| 681 | * A group is freed in rcu manner. But having an rcu lock does not |
| 682 | * mean that one can access all the fields of blkg and assume these |
| 683 | * are valid. For example, don't try to follow throtl_data and |
| 684 | * request queue links. |
| 685 | * |
| 686 | * Having a reference to blkg under an rcu allows acess to only |
| 687 | * values local to groups like group stats and group rate limits |
| 688 | */ |
| 689 | call_rcu(&blkg->rcu_head, blkg_rcu_free); |
| 690 | } |
| 691 | EXPORT_SYMBOL_GPL(__blkg_release); |
| 692 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 693 | static void blkio_reset_stats_cpu(struct blkio_group *blkg, int plid) |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 694 | { |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 695 | struct blkg_policy_data *pd = blkg->pd[plid]; |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 696 | int cpu; |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 697 | |
| 698 | if (pd->stats_cpu == NULL) |
| 699 | return; |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 700 | |
| 701 | for_each_possible_cpu(cpu) { |
| 702 | struct blkio_group_stats_cpu *sc = |
| 703 | per_cpu_ptr(pd->stats_cpu, cpu); |
| 704 | |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 705 | blkg_rwstat_reset(&sc->service_bytes); |
| 706 | blkg_rwstat_reset(&sc->serviced); |
| 707 | blkg_stat_reset(&sc->sectors); |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 708 | } |
| 709 | } |
| 710 | |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 711 | static int |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 712 | blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 713 | { |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 714 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 715 | struct blkio_group *blkg; |
| 716 | struct hlist_node *n; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 717 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 718 | spin_lock(&blkio_list_lock); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 719 | spin_lock_irq(&blkcg->lock); |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 720 | |
| 721 | /* |
| 722 | * Note that stat reset is racy - it doesn't synchronize against |
| 723 | * stat updates. This is a debug feature which shouldn't exist |
| 724 | * anyway. If you get hit by a race, retry. |
| 725 | */ |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 726 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 727 | struct blkio_policy_type *pol; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 728 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 729 | list_for_each_entry(pol, &blkio_list, list) { |
| 730 | struct blkg_policy_data *pd = blkg->pd[pol->plid]; |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 731 | struct blkio_group_stats *stats = &pd->stats; |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 732 | |
Tejun Heo | 997a026 | 2012-03-08 10:53:58 -0800 | [diff] [blame] | 733 | /* queued stats shouldn't be cleared */ |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 734 | blkg_rwstat_reset(&stats->merged); |
| 735 | blkg_rwstat_reset(&stats->service_time); |
| 736 | blkg_rwstat_reset(&stats->wait_time); |
| 737 | blkg_stat_reset(&stats->time); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 738 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 739 | blkg_stat_reset(&stats->unaccounted_time); |
| 740 | blkg_stat_reset(&stats->avg_queue_size_sum); |
| 741 | blkg_stat_reset(&stats->avg_queue_size_samples); |
| 742 | blkg_stat_reset(&stats->dequeue); |
| 743 | blkg_stat_reset(&stats->group_wait_time); |
| 744 | blkg_stat_reset(&stats->idle_time); |
| 745 | blkg_stat_reset(&stats->empty_time); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 746 | #endif |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 747 | blkio_reset_stats_cpu(blkg, pol->plid); |
| 748 | } |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 749 | } |
Vivek Goyal | f0bdc8c | 2011-05-19 15:38:30 -0400 | [diff] [blame] | 750 | |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 751 | spin_unlock_irq(&blkcg->lock); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 752 | spin_unlock(&blkio_list_lock); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 753 | return 0; |
| 754 | } |
| 755 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 756 | static const char *blkg_dev_name(struct blkio_group *blkg) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 757 | { |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 758 | /* some drivers (floppy) instantiate a queue w/o disk registered */ |
| 759 | if (blkg->q->backing_dev_info.dev) |
| 760 | return dev_name(blkg->q->backing_dev_info.dev); |
| 761 | return NULL; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 762 | } |
| 763 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 764 | /** |
| 765 | * blkcg_print_blkgs - helper for printing per-blkg data |
| 766 | * @sf: seq_file to print to |
| 767 | * @blkcg: blkcg of interest |
| 768 | * @prfill: fill function to print out a blkg |
| 769 | * @pol: policy in question |
| 770 | * @data: data to be passed to @prfill |
| 771 | * @show_total: to print out sum of prfill return values or not |
| 772 | * |
| 773 | * This function invokes @prfill on each blkg of @blkcg if pd for the |
| 774 | * policy specified by @pol exists. @prfill is invoked with @sf, the |
| 775 | * policy data and @data. If @show_total is %true, the sum of the return |
| 776 | * values from @prfill is printed with "Total" label at the end. |
| 777 | * |
| 778 | * This is to be used to construct print functions for |
| 779 | * cftype->read_seq_string method. |
| 780 | */ |
| 781 | static void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg, |
| 782 | u64 (*prfill)(struct seq_file *, |
| 783 | struct blkg_policy_data *, int), |
| 784 | int pol, int data, bool show_total) |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 785 | { |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 786 | struct blkio_group *blkg; |
| 787 | struct hlist_node *n; |
| 788 | u64 total = 0; |
| 789 | |
| 790 | spin_lock_irq(&blkcg->lock); |
| 791 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) |
| 792 | if (blkg->pd[pol]) |
| 793 | total += prfill(sf, blkg->pd[pol], data); |
| 794 | spin_unlock_irq(&blkcg->lock); |
| 795 | |
| 796 | if (show_total) |
| 797 | seq_printf(sf, "Total %llu\n", (unsigned long long)total); |
| 798 | } |
| 799 | |
| 800 | /** |
| 801 | * __blkg_prfill_u64 - prfill helper for a single u64 value |
| 802 | * @sf: seq_file to print to |
| 803 | * @pd: policy data of interest |
| 804 | * @v: value to print |
| 805 | * |
| 806 | * Print @v to @sf for the device assocaited with @pd. |
| 807 | */ |
| 808 | static u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, |
| 809 | u64 v) |
| 810 | { |
| 811 | const char *dname = blkg_dev_name(pd->blkg); |
| 812 | |
| 813 | if (!dname) |
| 814 | return 0; |
| 815 | |
| 816 | seq_printf(sf, "%s %llu\n", dname, (unsigned long long)v); |
| 817 | return v; |
| 818 | } |
| 819 | |
| 820 | /** |
| 821 | * __blkg_prfill_rwstat - prfill helper for a blkg_rwstat |
| 822 | * @sf: seq_file to print to |
| 823 | * @pd: policy data of interest |
| 824 | * @rwstat: rwstat to print |
| 825 | * |
| 826 | * Print @rwstat to @sf for the device assocaited with @pd. |
| 827 | */ |
| 828 | static u64 __blkg_prfill_rwstat(struct seq_file *sf, |
| 829 | struct blkg_policy_data *pd, |
| 830 | const struct blkg_rwstat *rwstat) |
| 831 | { |
| 832 | static const char *rwstr[] = { |
| 833 | [BLKG_RWSTAT_READ] = "Read", |
| 834 | [BLKG_RWSTAT_WRITE] = "Write", |
| 835 | [BLKG_RWSTAT_SYNC] = "Sync", |
| 836 | [BLKG_RWSTAT_ASYNC] = "Async", |
| 837 | }; |
| 838 | const char *dname = blkg_dev_name(pd->blkg); |
| 839 | u64 v; |
| 840 | int i; |
| 841 | |
| 842 | if (!dname) |
| 843 | return 0; |
| 844 | |
| 845 | for (i = 0; i < BLKG_RWSTAT_NR; i++) |
| 846 | seq_printf(sf, "%s %s %llu\n", dname, rwstr[i], |
| 847 | (unsigned long long)rwstat->cnt[i]); |
| 848 | |
| 849 | v = rwstat->cnt[BLKG_RWSTAT_READ] + rwstat->cnt[BLKG_RWSTAT_WRITE]; |
| 850 | seq_printf(sf, "%s Total %llu\n", dname, (unsigned long long)v); |
| 851 | return v; |
| 852 | } |
| 853 | |
| 854 | static u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, |
| 855 | int off) |
| 856 | { |
| 857 | return __blkg_prfill_u64(sf, pd, |
| 858 | blkg_stat_read((void *)&pd->stats + off)); |
| 859 | } |
| 860 | |
| 861 | static u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd, |
| 862 | int off) |
| 863 | { |
| 864 | struct blkg_rwstat rwstat = blkg_rwstat_read((void *)&pd->stats + off); |
| 865 | |
| 866 | return __blkg_prfill_rwstat(sf, pd, &rwstat); |
| 867 | } |
| 868 | |
| 869 | /* print blkg_stat specified by BLKCG_STAT_PRIV() */ |
| 870 | static int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft, |
| 871 | struct seq_file *sf) |
| 872 | { |
| 873 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 874 | |
| 875 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat, |
| 876 | BLKCG_STAT_POL(cft->private), |
| 877 | BLKCG_STAT_OFF(cft->private), false); |
| 878 | return 0; |
| 879 | } |
| 880 | |
| 881 | /* print blkg_rwstat specified by BLKCG_STAT_PRIV() */ |
| 882 | static int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft, |
| 883 | struct seq_file *sf) |
| 884 | { |
| 885 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 886 | |
| 887 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat, |
| 888 | BLKCG_STAT_POL(cft->private), |
| 889 | BLKCG_STAT_OFF(cft->private), true); |
| 890 | return 0; |
| 891 | } |
| 892 | |
| 893 | static u64 blkg_prfill_cpu_stat(struct seq_file *sf, |
| 894 | struct blkg_policy_data *pd, int off) |
| 895 | { |
| 896 | u64 v = 0; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 897 | int cpu; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 898 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 899 | for_each_possible_cpu(cpu) { |
| 900 | struct blkio_group_stats_cpu *sc = |
| 901 | per_cpu_ptr(pd->stats_cpu, cpu); |
| 902 | |
| 903 | v += blkg_stat_read((void *)sc + off); |
| 904 | } |
| 905 | |
| 906 | return __blkg_prfill_u64(sf, pd, v); |
| 907 | } |
| 908 | |
| 909 | static u64 blkg_prfill_cpu_rwstat(struct seq_file *sf, |
| 910 | struct blkg_policy_data *pd, int off) |
| 911 | { |
| 912 | struct blkg_rwstat rwstat = { }, tmp; |
| 913 | int i, cpu; |
Vivek Goyal | 1cd9e03 | 2012-03-08 10:53:56 -0800 | [diff] [blame] | 914 | |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 915 | for_each_possible_cpu(cpu) { |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 916 | struct blkio_group_stats_cpu *sc = |
Tejun Heo | edcb072 | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 917 | per_cpu_ptr(pd->stats_cpu, cpu); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 918 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 919 | tmp = blkg_rwstat_read((void *)sc + off); |
| 920 | for (i = 0; i < BLKG_RWSTAT_NR; i++) |
| 921 | rwstat.cnt[i] += tmp.cnt[i]; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 922 | } |
| 923 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 924 | return __blkg_prfill_rwstat(sf, pd, &rwstat); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 925 | } |
| 926 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 927 | /* print per-cpu blkg_stat specified by BLKCG_STAT_PRIV() */ |
| 928 | static int blkcg_print_cpu_stat(struct cgroup *cgrp, struct cftype *cft, |
| 929 | struct seq_file *sf) |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 930 | { |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 931 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 932 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 933 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_cpu_stat, |
| 934 | BLKCG_STAT_POL(cft->private), |
| 935 | BLKCG_STAT_OFF(cft->private), false); |
| 936 | return 0; |
Vivek Goyal | 5624a4e | 2011-05-19 15:38:28 -0400 | [diff] [blame] | 937 | } |
| 938 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 939 | /* print per-cpu blkg_rwstat specified by BLKCG_STAT_PRIV() */ |
| 940 | static int blkcg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft, |
| 941 | struct seq_file *sf) |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 942 | { |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 943 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 944 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 945 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_cpu_rwstat, |
| 946 | BLKCG_STAT_POL(cft->private), |
| 947 | BLKCG_STAT_OFF(cft->private), true); |
| 948 | return 0; |
| 949 | } |
| 950 | |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 951 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 952 | static u64 blkg_prfill_avg_queue_size(struct seq_file *sf, |
| 953 | struct blkg_policy_data *pd, int off) |
| 954 | { |
| 955 | u64 samples = blkg_stat_read(&pd->stats.avg_queue_size_samples); |
| 956 | u64 v = 0; |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 957 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 958 | if (samples) { |
| 959 | v = blkg_stat_read(&pd->stats.avg_queue_size_sum); |
| 960 | do_div(v, samples); |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 961 | } |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 962 | __blkg_prfill_u64(sf, pd, v); |
| 963 | return 0; |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 964 | } |
| 965 | |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 966 | /* print avg_queue_size */ |
| 967 | static int blkcg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft, |
| 968 | struct seq_file *sf) |
| 969 | { |
| 970 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 971 | |
| 972 | blkcg_print_blkgs(sf, blkcg, blkg_prfill_avg_queue_size, |
| 973 | BLKIO_POLICY_PROP, 0, false); |
| 974 | return 0; |
| 975 | } |
| 976 | #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
| 977 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 978 | static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid, |
| 979 | int fileid, struct blkio_cgroup *blkcg) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 980 | { |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 981 | struct gendisk *disk = NULL; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 982 | struct blkio_group *blkg = NULL; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 983 | struct blkg_policy_data *pd; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 984 | char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 985 | unsigned long major, minor; |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 986 | int i = 0, ret = -EINVAL; |
| 987 | int part; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 988 | dev_t dev; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 989 | u64 temp; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 990 | |
| 991 | memset(s, 0, sizeof(s)); |
| 992 | |
| 993 | while ((p = strsep(&buf, " ")) != NULL) { |
| 994 | if (!*p) |
| 995 | continue; |
| 996 | |
| 997 | s[i++] = p; |
| 998 | |
| 999 | /* Prevent from inputing too many things */ |
| 1000 | if (i == 3) |
| 1001 | break; |
| 1002 | } |
| 1003 | |
| 1004 | if (i != 2) |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1005 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1006 | |
| 1007 | p = strsep(&s[0], ":"); |
| 1008 | if (p != NULL) |
| 1009 | major_s = p; |
| 1010 | else |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1011 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1012 | |
| 1013 | minor_s = s[0]; |
| 1014 | if (!minor_s) |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1015 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1016 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1017 | if (strict_strtoul(major_s, 10, &major)) |
| 1018 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1019 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1020 | if (strict_strtoul(minor_s, 10, &minor)) |
| 1021 | goto out; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1022 | |
| 1023 | dev = MKDEV(major, minor); |
| 1024 | |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1025 | if (strict_strtoull(s[1], 10, &temp)) |
| 1026 | goto out; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 1027 | |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1028 | disk = get_gendisk(dev, &part); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1029 | if (!disk || part) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1030 | goto out; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1031 | |
| 1032 | rcu_read_lock(); |
| 1033 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1034 | spin_lock_irq(disk->queue->queue_lock); |
Tejun Heo | aaec55a | 2012-04-01 14:38:42 -0700 | [diff] [blame] | 1035 | blkg = blkg_lookup_create(blkcg, disk->queue, false); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1036 | spin_unlock_irq(disk->queue->queue_lock); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1037 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1038 | if (IS_ERR(blkg)) { |
| 1039 | ret = PTR_ERR(blkg); |
| 1040 | goto out_unlock; |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 1041 | } |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1042 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1043 | pd = blkg->pd[plid]; |
| 1044 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1045 | switch (plid) { |
| 1046 | case BLKIO_POLICY_PROP: |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 1047 | if ((temp < BLKIO_WEIGHT_MIN && temp > 0) || |
| 1048 | temp > BLKIO_WEIGHT_MAX) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1049 | goto out_unlock; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1050 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1051 | pd->conf.weight = temp; |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1052 | blkio_update_group_weight(blkg, plid, temp ?: blkcg->weight); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1053 | break; |
| 1054 | case BLKIO_POLICY_THROTL: |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1055 | switch(fileid) { |
| 1056 | case BLKIO_THROTL_read_bps_device: |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1057 | pd->conf.bps[READ] = temp; |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1058 | blkio_update_group_bps(blkg, plid, temp ?: -1, fileid); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1059 | break; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1060 | case BLKIO_THROTL_write_bps_device: |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1061 | pd->conf.bps[WRITE] = temp; |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1062 | blkio_update_group_bps(blkg, plid, temp ?: -1, fileid); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1063 | break; |
| 1064 | case BLKIO_THROTL_read_iops_device: |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1065 | if (temp > THROTL_IOPS_MAX) |
| 1066 | goto out_unlock; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1067 | pd->conf.iops[READ] = temp; |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1068 | blkio_update_group_iops(blkg, plid, temp ?: -1, fileid); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1069 | break; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1070 | case BLKIO_THROTL_write_iops_device: |
Wanlong Gao | d11bb44 | 2011-09-21 10:22:10 +0200 | [diff] [blame] | 1071 | if (temp > THROTL_IOPS_MAX) |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1072 | goto out_unlock; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1073 | pd->conf.iops[WRITE] = temp; |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1074 | blkio_update_group_iops(blkg, plid, temp ?: -1, fileid); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1075 | break; |
| 1076 | } |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1077 | break; |
| 1078 | default: |
| 1079 | BUG(); |
| 1080 | } |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1081 | ret = 0; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1082 | out_unlock: |
| 1083 | rcu_read_unlock(); |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1084 | out: |
| 1085 | put_disk(disk); |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1086 | |
| 1087 | /* |
| 1088 | * If queue was bypassing, we should retry. Do so after a short |
| 1089 | * msleep(). It isn't strictly necessary but queue can be |
| 1090 | * bypassing for some time and it's always nice to avoid busy |
| 1091 | * looping. |
| 1092 | */ |
| 1093 | if (ret == -EBUSY) { |
| 1094 | msleep(10); |
| 1095 | return restart_syscall(); |
| 1096 | } |
Tejun Heo | ece8424 | 2011-10-19 14:31:15 +0200 | [diff] [blame] | 1097 | return ret; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1098 | } |
| 1099 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1100 | static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, |
| 1101 | const char *buffer) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1102 | { |
| 1103 | int ret = 0; |
| 1104 | char *buf; |
Tejun Heo | e56da7e | 2012-03-05 13:15:07 -0800 | [diff] [blame] | 1105 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1106 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1107 | int fileid = BLKIOFILE_ATTR(cft->private); |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1108 | |
| 1109 | buf = kstrdup(buffer, GFP_KERNEL); |
| 1110 | if (!buf) |
| 1111 | return -ENOMEM; |
| 1112 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1113 | ret = blkio_policy_parse_and_set(buf, plid, fileid, blkcg); |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1114 | kfree(buf); |
| 1115 | return ret; |
| 1116 | } |
| 1117 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1118 | static void blkio_print_group_conf(struct cftype *cft, struct blkio_group *blkg, |
| 1119 | struct seq_file *m) |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1120 | { |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1121 | int plid = BLKIOFILE_POLICY(cft->private); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1122 | int fileid = BLKIOFILE_ATTR(cft->private); |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1123 | struct blkg_policy_data *pd = blkg->pd[plid]; |
| 1124 | const char *dname = blkg_dev_name(blkg); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1125 | int rw = WRITE; |
| 1126 | |
Vivek Goyal | 92616b5 | 2012-03-05 13:15:10 -0800 | [diff] [blame] | 1127 | if (!dname) |
| 1128 | return; |
| 1129 | |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1130 | switch (plid) { |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1131 | case BLKIO_POLICY_PROP: |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1132 | if (pd->conf.weight) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1133 | seq_printf(m, "%s\t%u\n", |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1134 | dname, pd->conf.weight); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1135 | break; |
| 1136 | case BLKIO_POLICY_THROTL: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1137 | switch (fileid) { |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1138 | case BLKIO_THROTL_read_bps_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1139 | rw = READ; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1140 | case BLKIO_THROTL_write_bps_device: |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1141 | if (pd->conf.bps[rw]) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1142 | seq_printf(m, "%s\t%llu\n", |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1143 | dname, pd->conf.bps[rw]); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1144 | break; |
| 1145 | case BLKIO_THROTL_read_iops_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1146 | rw = READ; |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1147 | case BLKIO_THROTL_write_iops_device: |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1148 | if (pd->conf.iops[rw]) |
Tejun Heo | 7a4dd28 | 2012-03-05 13:15:09 -0800 | [diff] [blame] | 1149 | seq_printf(m, "%s\t%u\n", |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1150 | dname, pd->conf.iops[rw]); |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1151 | break; |
| 1152 | } |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1153 | break; |
| 1154 | default: |
| 1155 | BUG(); |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | /* cgroup files which read their data from policy nodes end up here */ |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1160 | static void blkio_read_conf(struct cftype *cft, struct blkio_cgroup *blkcg, |
| 1161 | struct seq_file *m) |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1162 | { |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1163 | struct blkio_group *blkg; |
| 1164 | struct hlist_node *n; |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1165 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1166 | spin_lock_irq(&blkcg->lock); |
| 1167 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1168 | blkio_print_group_conf(cft, blkg, m); |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1169 | spin_unlock_irq(&blkcg->lock); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1170 | } |
| 1171 | |
| 1172 | static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, |
| 1173 | struct seq_file *m) |
| 1174 | { |
| 1175 | struct blkio_cgroup *blkcg; |
| 1176 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1177 | int name = BLKIOFILE_ATTR(cft->private); |
| 1178 | |
| 1179 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1180 | |
| 1181 | switch(plid) { |
| 1182 | case BLKIO_POLICY_PROP: |
| 1183 | switch(name) { |
| 1184 | case BLKIO_PROP_weight_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1185 | blkio_read_conf(cft, blkcg, m); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1186 | return 0; |
| 1187 | default: |
| 1188 | BUG(); |
| 1189 | } |
| 1190 | break; |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1191 | case BLKIO_POLICY_THROTL: |
| 1192 | switch(name){ |
| 1193 | case BLKIO_THROTL_read_bps_device: |
| 1194 | case BLKIO_THROTL_write_bps_device: |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1195 | case BLKIO_THROTL_read_iops_device: |
| 1196 | case BLKIO_THROTL_write_iops_device: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1197 | blkio_read_conf(cft, blkcg, m); |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1198 | return 0; |
| 1199 | default: |
| 1200 | BUG(); |
| 1201 | } |
| 1202 | break; |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1203 | default: |
| 1204 | BUG(); |
| 1205 | } |
| 1206 | |
| 1207 | return 0; |
| 1208 | } |
| 1209 | |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1210 | 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] | 1211 | { |
| 1212 | struct blkio_group *blkg; |
| 1213 | struct hlist_node *n; |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1214 | |
| 1215 | if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) |
| 1216 | return -EINVAL; |
| 1217 | |
| 1218 | spin_lock(&blkio_list_lock); |
| 1219 | spin_lock_irq(&blkcg->lock); |
| 1220 | blkcg->weight = (unsigned int)val; |
| 1221 | |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1222 | hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1223 | struct blkg_policy_data *pd = blkg->pd[plid]; |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1224 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1225 | if (!pd->conf.weight) |
Tejun Heo | c176826 | 2012-03-05 13:15:17 -0800 | [diff] [blame] | 1226 | blkio_update_group_weight(blkg, plid, blkcg->weight); |
Tejun Heo | 549d3aa | 2012-03-05 13:15:16 -0800 | [diff] [blame] | 1227 | } |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1228 | |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1229 | spin_unlock_irq(&blkcg->lock); |
| 1230 | spin_unlock(&blkio_list_lock); |
| 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { |
| 1235 | struct blkio_cgroup *blkcg; |
| 1236 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1237 | int name = BLKIOFILE_ATTR(cft->private); |
| 1238 | |
| 1239 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1240 | |
| 1241 | switch(plid) { |
| 1242 | case BLKIO_POLICY_PROP: |
| 1243 | switch(name) { |
| 1244 | case BLKIO_PROP_weight: |
| 1245 | return (u64)blkcg->weight; |
| 1246 | } |
| 1247 | break; |
| 1248 | default: |
| 1249 | BUG(); |
| 1250 | } |
| 1251 | return 0; |
| 1252 | } |
| 1253 | |
| 1254 | static int |
| 1255 | blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) |
| 1256 | { |
| 1257 | struct blkio_cgroup *blkcg; |
| 1258 | enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); |
| 1259 | int name = BLKIOFILE_ATTR(cft->private); |
| 1260 | |
| 1261 | blkcg = cgroup_to_blkio_cgroup(cgrp); |
| 1262 | |
| 1263 | switch(plid) { |
| 1264 | case BLKIO_POLICY_PROP: |
| 1265 | switch(name) { |
| 1266 | case BLKIO_PROP_weight: |
Tejun Heo | 4bfd482 | 2012-03-05 13:15:08 -0800 | [diff] [blame] | 1267 | return blkio_weight_write(blkcg, plid, val); |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1268 | } |
| 1269 | break; |
| 1270 | default: |
| 1271 | BUG(); |
| 1272 | } |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1273 | |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1274 | return 0; |
| 1275 | } |
| 1276 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1277 | struct cftype blkio_files[] = { |
| 1278 | { |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1279 | .name = "weight_device", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1280 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1281 | BLKIO_PROP_weight_device), |
| 1282 | .read_seq_string = blkiocg_file_read, |
| 1283 | .write_string = blkiocg_file_write, |
Gui Jianfeng | 34d0f17 | 2010-04-13 16:05:49 +0800 | [diff] [blame] | 1284 | .max_write_len = 256, |
| 1285 | }, |
| 1286 | { |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1287 | .name = "weight", |
Vivek Goyal | 062a644 | 2010-09-15 17:06:33 -0400 | [diff] [blame] | 1288 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, |
| 1289 | BLKIO_PROP_weight), |
| 1290 | .read_u64 = blkiocg_file_read_u64, |
| 1291 | .write_u64 = blkiocg_file_write_u64, |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1292 | }, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1293 | { |
| 1294 | .name = "time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1295 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1296 | offsetof(struct blkio_group_stats, time)), |
| 1297 | .read_seq_string = blkcg_print_stat, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1298 | }, |
| 1299 | { |
| 1300 | .name = "sectors", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1301 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1302 | offsetof(struct blkio_group_stats_cpu, sectors)), |
| 1303 | .read_seq_string = blkcg_print_cpu_stat, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1304 | }, |
| 1305 | { |
| 1306 | .name = "io_service_bytes", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1307 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1308 | offsetof(struct blkio_group_stats_cpu, service_bytes)), |
| 1309 | .read_seq_string = blkcg_print_cpu_rwstat, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1310 | }, |
| 1311 | { |
| 1312 | .name = "io_serviced", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1313 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1314 | offsetof(struct blkio_group_stats_cpu, serviced)), |
| 1315 | .read_seq_string = blkcg_print_cpu_rwstat, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1316 | }, |
| 1317 | { |
| 1318 | .name = "io_service_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1319 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1320 | offsetof(struct blkio_group_stats, service_time)), |
| 1321 | .read_seq_string = blkcg_print_rwstat, |
Divyesh Shah | 303a3ac | 2010-04-01 15:01:24 -0700 | [diff] [blame] | 1322 | }, |
| 1323 | { |
| 1324 | .name = "io_wait_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1325 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1326 | offsetof(struct blkio_group_stats, wait_time)), |
| 1327 | .read_seq_string = blkcg_print_rwstat, |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1328 | }, |
| 1329 | { |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 1330 | .name = "io_merged", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1331 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1332 | offsetof(struct blkio_group_stats, merged)), |
| 1333 | .read_seq_string = blkcg_print_rwstat, |
Divyesh Shah | 812d402 | 2010-04-08 21:14:23 -0700 | [diff] [blame] | 1334 | }, |
| 1335 | { |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1336 | .name = "io_queued", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1337 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1338 | offsetof(struct blkio_group_stats, queued)), |
| 1339 | .read_seq_string = blkcg_print_rwstat, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1340 | }, |
| 1341 | { |
Divyesh Shah | 84c124d | 2010-04-09 08:31:19 +0200 | [diff] [blame] | 1342 | .name = "reset_stats", |
| 1343 | .write_u64 = blkiocg_reset_stats, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1344 | }, |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1345 | #ifdef CONFIG_BLK_DEV_THROTTLING |
| 1346 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1347 | .name = "throttle.read_bps_device", |
| 1348 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1349 | BLKIO_THROTL_read_bps_device), |
| 1350 | .read_seq_string = blkiocg_file_read, |
| 1351 | .write_string = blkiocg_file_write, |
| 1352 | .max_write_len = 256, |
| 1353 | }, |
| 1354 | |
| 1355 | { |
| 1356 | .name = "throttle.write_bps_device", |
| 1357 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1358 | BLKIO_THROTL_write_bps_device), |
| 1359 | .read_seq_string = blkiocg_file_read, |
| 1360 | .write_string = blkiocg_file_write, |
| 1361 | .max_write_len = 256, |
| 1362 | }, |
Vivek Goyal | 7702e8f | 2010-09-15 17:06:36 -0400 | [diff] [blame] | 1363 | |
| 1364 | { |
| 1365 | .name = "throttle.read_iops_device", |
| 1366 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1367 | BLKIO_THROTL_read_iops_device), |
| 1368 | .read_seq_string = blkiocg_file_read, |
| 1369 | .write_string = blkiocg_file_write, |
| 1370 | .max_write_len = 256, |
| 1371 | }, |
| 1372 | |
| 1373 | { |
| 1374 | .name = "throttle.write_iops_device", |
| 1375 | .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, |
| 1376 | BLKIO_THROTL_write_iops_device), |
| 1377 | .read_seq_string = blkiocg_file_read, |
| 1378 | .write_string = blkiocg_file_write, |
| 1379 | .max_write_len = 256, |
| 1380 | }, |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1381 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1382 | .name = "throttle.io_service_bytes", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1383 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_THROTL, |
| 1384 | offsetof(struct blkio_group_stats_cpu, service_bytes)), |
| 1385 | .read_seq_string = blkcg_print_cpu_rwstat, |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1386 | }, |
| 1387 | { |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1388 | .name = "throttle.io_serviced", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1389 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_THROTL, |
| 1390 | offsetof(struct blkio_group_stats_cpu, serviced)), |
| 1391 | .read_seq_string = blkcg_print_cpu_rwstat, |
Vivek Goyal | 4c9eefa | 2010-09-15 17:06:34 -0400 | [diff] [blame] | 1392 | }, |
Vivek Goyal | 13f9825 | 2010-10-01 14:49:41 +0200 | [diff] [blame] | 1393 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
| 1394 | |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1395 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1396 | { |
| 1397 | .name = "avg_queue_size", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1398 | .read_seq_string = blkcg_print_avg_queue_size, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1399 | }, |
| 1400 | { |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1401 | .name = "group_wait_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1402 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1403 | offsetof(struct blkio_group_stats, group_wait_time)), |
| 1404 | .read_seq_string = blkcg_print_stat, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1405 | }, |
| 1406 | { |
| 1407 | .name = "idle_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1408 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1409 | offsetof(struct blkio_group_stats, idle_time)), |
| 1410 | .read_seq_string = blkcg_print_stat, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1411 | }, |
| 1412 | { |
| 1413 | .name = "empty_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1414 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1415 | offsetof(struct blkio_group_stats, empty_time)), |
| 1416 | .read_seq_string = blkcg_print_stat, |
Divyesh Shah | 812df48 | 2010-04-08 21:15:35 -0700 | [diff] [blame] | 1417 | }, |
| 1418 | { |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1419 | .name = "dequeue", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1420 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1421 | offsetof(struct blkio_group_stats, dequeue)), |
| 1422 | .read_seq_string = blkcg_print_stat, |
Divyesh Shah | cdc1184 | 2010-04-08 21:15:10 -0700 | [diff] [blame] | 1423 | }, |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 1424 | { |
| 1425 | .name = "unaccounted_time", |
Tejun Heo | d3d32e6 | 2012-04-01 14:38:42 -0700 | [diff] [blame^] | 1426 | .private = BLKCG_STAT_PRIV(BLKIO_POLICY_PROP, |
| 1427 | offsetof(struct blkio_group_stats, unaccounted_time)), |
| 1428 | .read_seq_string = blkcg_print_stat, |
Justin TerAvest | 9026e52 | 2011-03-22 21:26:54 +0100 | [diff] [blame] | 1429 | }, |
Vivek Goyal | 2208419 | 2009-12-03 12:59:49 -0500 | [diff] [blame] | 1430 | #endif |
Tejun Heo | 4baf6e3 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1431 | { } /* terminate */ |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1432 | }; |
| 1433 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1434 | /** |
| 1435 | * blkiocg_pre_destroy - cgroup pre_destroy callback |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1436 | * @cgroup: cgroup of interest |
| 1437 | * |
| 1438 | * This function is called when @cgroup is about to go away and responsible |
| 1439 | * for shooting down all blkgs associated with @cgroup. blkgs should be |
| 1440 | * removed while holding both q and blkcg locks. As blkcg lock is nested |
| 1441 | * inside q lock, this function performs reverse double lock dancing. |
| 1442 | * |
| 1443 | * This is the blkcg counterpart of ioc_release_fn(). |
| 1444 | */ |
Tejun Heo | 959d851 | 2012-04-01 12:30:01 -0700 | [diff] [blame] | 1445 | static int blkiocg_pre_destroy(struct cgroup *cgroup) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1446 | { |
| 1447 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
| 1448 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1449 | spin_lock_irq(&blkcg->lock); |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1450 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1451 | while (!hlist_empty(&blkcg->blkg_list)) { |
| 1452 | struct blkio_group *blkg = hlist_entry(blkcg->blkg_list.first, |
| 1453 | struct blkio_group, blkcg_node); |
Tejun Heo | c875f4d | 2012-03-05 13:15:22 -0800 | [diff] [blame] | 1454 | struct request_queue *q = blkg->q; |
Vivek Goyal | b1c3576 | 2009-12-03 12:59:47 -0500 | [diff] [blame] | 1455 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1456 | if (spin_trylock(q->queue_lock)) { |
| 1457 | blkg_destroy(blkg); |
| 1458 | spin_unlock(q->queue_lock); |
| 1459 | } else { |
| 1460 | spin_unlock_irq(&blkcg->lock); |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1461 | cpu_relax(); |
Dan Carpenter | a556793 | 2012-03-29 20:57:08 +0200 | [diff] [blame] | 1462 | spin_lock_irq(&blkcg->lock); |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1463 | } |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1464 | } |
Jens Axboe | 0f3942a | 2010-05-03 14:28:55 +0200 | [diff] [blame] | 1465 | |
Tejun Heo | 9f13ef6 | 2012-03-05 13:15:21 -0800 | [diff] [blame] | 1466 | spin_unlock_irq(&blkcg->lock); |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1467 | return 0; |
| 1468 | } |
| 1469 | |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 1470 | static void blkiocg_destroy(struct cgroup *cgroup) |
Tejun Heo | 7ee9c56 | 2012-03-05 13:15:11 -0800 | [diff] [blame] | 1471 | { |
| 1472 | struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
| 1473 | |
Ben Blum | 67523c4 | 2010-03-10 15:22:11 -0800 | [diff] [blame] | 1474 | if (blkcg != &blkio_root_cgroup) |
| 1475 | kfree(blkcg); |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1476 | } |
| 1477 | |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 1478 | static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1479 | { |
Tejun Heo | 9a9e8a2 | 2012-03-19 15:10:56 -0700 | [diff] [blame] | 1480 | static atomic64_t id_seq = ATOMIC64_INIT(0); |
Li Zefan | 0341509 | 2010-05-07 08:57:00 +0200 | [diff] [blame] | 1481 | struct blkio_cgroup *blkcg; |
| 1482 | struct cgroup *parent = cgroup->parent; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1483 | |
Li Zefan | 0341509 | 2010-05-07 08:57:00 +0200 | [diff] [blame] | 1484 | if (!parent) { |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1485 | blkcg = &blkio_root_cgroup; |
| 1486 | goto done; |
| 1487 | } |
| 1488 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1489 | blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); |
| 1490 | if (!blkcg) |
| 1491 | return ERR_PTR(-ENOMEM); |
| 1492 | |
| 1493 | blkcg->weight = BLKIO_WEIGHT_DEFAULT; |
Tejun Heo | 9a9e8a2 | 2012-03-19 15:10:56 -0700 | [diff] [blame] | 1494 | blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */ |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1495 | done: |
| 1496 | spin_lock_init(&blkcg->lock); |
| 1497 | INIT_HLIST_HEAD(&blkcg->blkg_list); |
| 1498 | |
| 1499 | return &blkcg->css; |
| 1500 | } |
| 1501 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1502 | /** |
| 1503 | * blkcg_init_queue - initialize blkcg part of request queue |
| 1504 | * @q: request_queue to initialize |
| 1505 | * |
| 1506 | * Called from blk_alloc_queue_node(). Responsible for initializing blkcg |
| 1507 | * part of new request_queue @q. |
| 1508 | * |
| 1509 | * RETURNS: |
| 1510 | * 0 on success, -errno on failure. |
| 1511 | */ |
| 1512 | int blkcg_init_queue(struct request_queue *q) |
| 1513 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1514 | int ret; |
| 1515 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1516 | might_sleep(); |
| 1517 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1518 | ret = blk_throtl_init(q); |
| 1519 | if (ret) |
| 1520 | return ret; |
| 1521 | |
| 1522 | mutex_lock(&all_q_mutex); |
| 1523 | INIT_LIST_HEAD(&q->all_q_node); |
| 1524 | list_add_tail(&q->all_q_node, &all_q_list); |
| 1525 | mutex_unlock(&all_q_mutex); |
| 1526 | |
| 1527 | return 0; |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1528 | } |
| 1529 | |
| 1530 | /** |
| 1531 | * blkcg_drain_queue - drain blkcg part of request_queue |
| 1532 | * @q: request_queue to drain |
| 1533 | * |
| 1534 | * Called from blk_drain_queue(). Responsible for draining blkcg part. |
| 1535 | */ |
| 1536 | void blkcg_drain_queue(struct request_queue *q) |
| 1537 | { |
| 1538 | lockdep_assert_held(q->queue_lock); |
| 1539 | |
| 1540 | blk_throtl_drain(q); |
| 1541 | } |
| 1542 | |
| 1543 | /** |
| 1544 | * blkcg_exit_queue - exit and release blkcg part of request_queue |
| 1545 | * @q: request_queue being released |
| 1546 | * |
| 1547 | * Called from blk_release_queue(). Responsible for exiting blkcg part. |
| 1548 | */ |
| 1549 | void blkcg_exit_queue(struct request_queue *q) |
| 1550 | { |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1551 | mutex_lock(&all_q_mutex); |
| 1552 | list_del_init(&q->all_q_node); |
| 1553 | mutex_unlock(&all_q_mutex); |
| 1554 | |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1555 | blkg_destroy_all(q, true); |
| 1556 | |
Tejun Heo | 5efd611 | 2012-03-05 13:15:12 -0800 | [diff] [blame] | 1557 | blk_throtl_exit(q); |
| 1558 | } |
| 1559 | |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1560 | /* |
| 1561 | * We cannot support shared io contexts, as we have no mean to support |
| 1562 | * two tasks with the same ioc in two different groups without major rework |
| 1563 | * of the main cic data structures. For now we allow a task to change |
| 1564 | * its cgroup only if it's the only owner of its ioc. |
| 1565 | */ |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 1566 | static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1567 | { |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1568 | struct task_struct *task; |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1569 | struct io_context *ioc; |
| 1570 | int ret = 0; |
| 1571 | |
| 1572 | /* task_lock() is needed to avoid races with exit_io_context() */ |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 1573 | cgroup_taskset_for_each(task, cgrp, tset) { |
| 1574 | task_lock(task); |
| 1575 | ioc = task->io_context; |
| 1576 | if (ioc && atomic_read(&ioc->nr_tasks) > 1) |
| 1577 | ret = -EINVAL; |
| 1578 | task_unlock(task); |
| 1579 | if (ret) |
| 1580 | break; |
| 1581 | } |
Vivek Goyal | 31e4c28 | 2009-12-03 12:59:42 -0500 | [diff] [blame] | 1582 | return ret; |
| 1583 | } |
| 1584 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1585 | static void blkcg_bypass_start(void) |
| 1586 | __acquires(&all_q_mutex) |
| 1587 | { |
| 1588 | struct request_queue *q; |
| 1589 | |
| 1590 | mutex_lock(&all_q_mutex); |
| 1591 | |
| 1592 | list_for_each_entry(q, &all_q_list, all_q_node) { |
| 1593 | blk_queue_bypass_start(q); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1594 | blkg_destroy_all(q, false); |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1595 | } |
| 1596 | } |
| 1597 | |
| 1598 | static void blkcg_bypass_end(void) |
| 1599 | __releases(&all_q_mutex) |
| 1600 | { |
| 1601 | struct request_queue *q; |
| 1602 | |
| 1603 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 1604 | blk_queue_bypass_end(q); |
| 1605 | |
| 1606 | mutex_unlock(&all_q_mutex); |
| 1607 | } |
| 1608 | |
Tejun Heo | 676f7c8 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1609 | struct cgroup_subsys blkio_subsys = { |
| 1610 | .name = "blkio", |
| 1611 | .create = blkiocg_create, |
| 1612 | .can_attach = blkiocg_can_attach, |
Tejun Heo | 959d851 | 2012-04-01 12:30:01 -0700 | [diff] [blame] | 1613 | .pre_destroy = blkiocg_pre_destroy, |
Tejun Heo | 676f7c8 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1614 | .destroy = blkiocg_destroy, |
Tejun Heo | 676f7c8 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1615 | .subsys_id = blkio_subsys_id, |
Tejun Heo | 4baf6e3 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1616 | .base_cftypes = blkio_files, |
Tejun Heo | 676f7c8 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 1617 | .module = THIS_MODULE, |
| 1618 | }; |
| 1619 | EXPORT_SYMBOL_GPL(blkio_subsys); |
| 1620 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1621 | void blkio_policy_register(struct blkio_policy_type *blkiop) |
| 1622 | { |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1623 | struct request_queue *q; |
| 1624 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1625 | blkcg_bypass_start(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1626 | spin_lock(&blkio_list_lock); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1627 | |
| 1628 | BUG_ON(blkio_policy[blkiop->plid]); |
| 1629 | blkio_policy[blkiop->plid] = blkiop; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1630 | list_add_tail(&blkiop->list, &blkio_list); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1631 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1632 | spin_unlock(&blkio_list_lock); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1633 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 1634 | update_root_blkg_pd(q, blkiop->plid); |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1635 | blkcg_bypass_end(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1636 | } |
| 1637 | EXPORT_SYMBOL_GPL(blkio_policy_register); |
| 1638 | |
| 1639 | void blkio_policy_unregister(struct blkio_policy_type *blkiop) |
| 1640 | { |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1641 | struct request_queue *q; |
| 1642 | |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1643 | blkcg_bypass_start(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1644 | spin_lock(&blkio_list_lock); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1645 | |
| 1646 | BUG_ON(blkio_policy[blkiop->plid] != blkiop); |
| 1647 | blkio_policy[blkiop->plid] = NULL; |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1648 | list_del_init(&blkiop->list); |
Tejun Heo | 035d10b | 2012-03-05 13:15:04 -0800 | [diff] [blame] | 1649 | |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1650 | spin_unlock(&blkio_list_lock); |
Tejun Heo | e8989fa | 2012-03-05 13:15:20 -0800 | [diff] [blame] | 1651 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 1652 | update_root_blkg_pd(q, blkiop->plid); |
Tejun Heo | 923adde | 2012-03-05 13:15:13 -0800 | [diff] [blame] | 1653 | blkcg_bypass_end(); |
Vivek Goyal | 3e25206 | 2009-12-04 10:36:42 -0500 | [diff] [blame] | 1654 | } |
| 1655 | EXPORT_SYMBOL_GPL(blkio_policy_unregister); |