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block/blk-cgroup.c
42.9 KB
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/* * Common Block IO controller cgroup interface * * Based on ideas and code from CFQ, CFS and BFQ: * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> * * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> * Paolo Valente <paolo.valente@unimore.it> * * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> * Nauman Rafique <nauman@google.com> */ #include <linux/ioprio.h> |
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#include <linux/seq_file.h> #include <linux/kdev_t.h> |
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#include <linux/module.h> |
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#include <linux/err.h> |
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#include <linux/blkdev.h> |
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#include <linux/slab.h> |
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#include "blk-cgroup.h" |
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#include <linux/genhd.h> |
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#define MAX_KEY_LEN 100 |
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static DEFINE_SPINLOCK(blkio_list_lock); static LIST_HEAD(blkio_list); |
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struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; |
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EXPORT_SYMBOL_GPL(blkio_root_cgroup); |
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static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *, struct cgroup *); |
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static int blkiocg_can_attach_task(struct cgroup *, struct task_struct *); static void blkiocg_attach_task(struct cgroup *, struct task_struct *); |
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static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *); static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *); |
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/* for encoding cft->private value on file */ #define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val)) /* What policy owns the file, proportional or throttle */ #define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff) #define BLKIOFILE_ATTR(val) ((val) & 0xffff) |
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struct cgroup_subsys blkio_subsys = { .name = "blkio", .create = blkiocg_create, |
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.can_attach_task = blkiocg_can_attach_task, .attach_task = blkiocg_attach_task, |
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.destroy = blkiocg_destroy, .populate = blkiocg_populate, #ifdef CONFIG_BLK_CGROUP /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */ .subsys_id = blkio_subsys_id, #endif .use_id = 1, .module = THIS_MODULE, }; EXPORT_SYMBOL_GPL(blkio_subsys); |
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static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg, struct blkio_policy_node *pn) { list_add(&pn->node, &blkcg->policy_list); } |
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static inline bool cftype_blkg_same_policy(struct cftype *cft, struct blkio_group *blkg) { enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); if (blkg->plid == plid) return 1; return 0; } /* Determines if policy node matches cgroup file being accessed */ static inline bool pn_matches_cftype(struct cftype *cft, struct blkio_policy_node *pn) { enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int fileid = BLKIOFILE_ATTR(cft->private); return (plid == pn->plid && fileid == pn->fileid); } |
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/* Must be called with blkcg->lock held */ static inline void blkio_policy_delete_node(struct blkio_policy_node *pn) { list_del(&pn->node); } /* Must be called with blkcg->lock held */ static struct blkio_policy_node * |
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blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev, enum blkio_policy_id plid, int fileid) |
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{ struct blkio_policy_node *pn; list_for_each_entry(pn, &blkcg->policy_list, node) { |
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if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid) |
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return pn; } return NULL; } |
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struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), struct blkio_cgroup, css); } |
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EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup); |
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struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk) { return container_of(task_subsys_state(tsk, blkio_subsys_id), struct blkio_cgroup, css); } EXPORT_SYMBOL_GPL(task_blkio_cgroup); |
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static inline void blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight) { struct blkio_policy_type *blkiop; list_for_each_entry(blkiop, &blkio_list, list) { /* If this policy does not own the blkg, do not send updates */ if (blkiop->plid != blkg->plid) continue; if (blkiop->ops.blkio_update_group_weight_fn) |
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blkiop->ops.blkio_update_group_weight_fn(blkg->key, blkg, weight); |
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} } |
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static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps, int fileid) { struct blkio_policy_type *blkiop; list_for_each_entry(blkiop, &blkio_list, list) { /* If this policy does not own the blkg, do not send updates */ if (blkiop->plid != blkg->plid) continue; if (fileid == BLKIO_THROTL_read_bps_device && blkiop->ops.blkio_update_group_read_bps_fn) |
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blkiop->ops.blkio_update_group_read_bps_fn(blkg->key, blkg, bps); |
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if (fileid == BLKIO_THROTL_write_bps_device && blkiop->ops.blkio_update_group_write_bps_fn) |
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blkiop->ops.blkio_update_group_write_bps_fn(blkg->key, blkg, bps); |
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} } |
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static inline void blkio_update_group_iops(struct blkio_group *blkg, unsigned int iops, int fileid) { struct blkio_policy_type *blkiop; list_for_each_entry(blkiop, &blkio_list, list) { /* If this policy does not own the blkg, do not send updates */ if (blkiop->plid != blkg->plid) continue; if (fileid == BLKIO_THROTL_read_iops_device && blkiop->ops.blkio_update_group_read_iops_fn) |
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blkiop->ops.blkio_update_group_read_iops_fn(blkg->key, blkg, iops); |
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if (fileid == BLKIO_THROTL_write_iops_device && blkiop->ops.blkio_update_group_write_iops_fn) |
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blkiop->ops.blkio_update_group_write_iops_fn(blkg->key, blkg,iops); |
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} } |
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/* * Add to the appropriate stat variable depending on the request type. * This should be called with the blkg->stats_lock held. */ |
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static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction, bool sync) |
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{ |
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if (direction) stat[BLKIO_STAT_WRITE] += add; |
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else |
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stat[BLKIO_STAT_READ] += add; if (sync) stat[BLKIO_STAT_SYNC] += add; |
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else |
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stat[BLKIO_STAT_ASYNC] += add; |
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} |
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/* * Decrements the appropriate stat variable if non-zero depending on the * request type. Panics on value being zero. * This should be called with the blkg->stats_lock held. */ static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync) { if (direction) { BUG_ON(stat[BLKIO_STAT_WRITE] == 0); stat[BLKIO_STAT_WRITE]--; } else { BUG_ON(stat[BLKIO_STAT_READ] == 0); stat[BLKIO_STAT_READ]--; } if (sync) { BUG_ON(stat[BLKIO_STAT_SYNC] == 0); stat[BLKIO_STAT_SYNC]--; } else { BUG_ON(stat[BLKIO_STAT_ASYNC] == 0); stat[BLKIO_STAT_ASYNC]--; } } #ifdef CONFIG_DEBUG_BLK_CGROUP |
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/* This should be called with the blkg->stats_lock held. */ static void blkio_set_start_group_wait_time(struct blkio_group *blkg, struct blkio_group *curr_blkg) { if (blkio_blkg_waiting(&blkg->stats)) return; if (blkg == curr_blkg) return; blkg->stats.start_group_wait_time = sched_clock(); blkio_mark_blkg_waiting(&blkg->stats); } /* This should be called with the blkg->stats_lock held. */ static void blkio_update_group_wait_time(struct blkio_group_stats *stats) { unsigned long long now; if (!blkio_blkg_waiting(stats)) return; now = sched_clock(); if (time_after64(now, stats->start_group_wait_time)) stats->group_wait_time += now - stats->start_group_wait_time; blkio_clear_blkg_waiting(stats); } /* This should be called with the blkg->stats_lock held. */ static void blkio_end_empty_time(struct blkio_group_stats *stats) { unsigned long long now; if (!blkio_blkg_empty(stats)) return; now = sched_clock(); if (time_after64(now, stats->start_empty_time)) stats->empty_time += now - stats->start_empty_time; blkio_clear_blkg_empty(stats); } void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) { unsigned long flags; spin_lock_irqsave(&blkg->stats_lock, flags); BUG_ON(blkio_blkg_idling(&blkg->stats)); blkg->stats.start_idle_time = sched_clock(); blkio_mark_blkg_idling(&blkg->stats); spin_unlock_irqrestore(&blkg->stats_lock, flags); } EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats); void blkiocg_update_idle_time_stats(struct blkio_group *blkg) { unsigned long flags; unsigned long long now; struct blkio_group_stats *stats; spin_lock_irqsave(&blkg->stats_lock, flags); stats = &blkg->stats; if (blkio_blkg_idling(stats)) { now = sched_clock(); if (time_after64(now, stats->start_idle_time)) stats->idle_time += now - stats->start_idle_time; blkio_clear_blkg_idling(stats); } spin_unlock_irqrestore(&blkg->stats_lock, flags); } EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats); |
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void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) |
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{ unsigned long flags; struct blkio_group_stats *stats; spin_lock_irqsave(&blkg->stats_lock, flags); stats = &blkg->stats; stats->avg_queue_size_sum += stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] + stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]; stats->avg_queue_size_samples++; |
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blkio_update_group_wait_time(stats); |
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spin_unlock_irqrestore(&blkg->stats_lock, flags); } |
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EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); |
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void blkiocg_set_start_empty_time(struct blkio_group *blkg) |
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{ unsigned long flags; struct blkio_group_stats *stats; spin_lock_irqsave(&blkg->stats_lock, flags); stats = &blkg->stats; if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { spin_unlock_irqrestore(&blkg->stats_lock, flags); return; } /* |
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* group is already marked empty. This can happen if cfqq got new * request in parent group and moved to this group while being added * to service tree. Just ignore the event and move on. |
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*/ |
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if(blkio_blkg_empty(stats)) { spin_unlock_irqrestore(&blkg->stats_lock, flags); return; } |
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stats->start_empty_time = sched_clock(); blkio_mark_blkg_empty(stats); spin_unlock_irqrestore(&blkg->stats_lock, flags); } EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); |
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void blkiocg_update_dequeue_stats(struct blkio_group *blkg, unsigned long dequeue) { blkg->stats.dequeue += dequeue; } EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats); |
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#else static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg, struct blkio_group *curr_blkg) {} static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {} |
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#endif |
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void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
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struct blkio_group *curr_blkg, bool direction, bool sync) { unsigned long flags; spin_lock_irqsave(&blkg->stats_lock, flags); blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction, sync); |
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blkio_end_empty_time(&blkg->stats); blkio_set_start_group_wait_time(blkg, curr_blkg); |
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spin_unlock_irqrestore(&blkg->stats_lock, flags); } |
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EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats); |
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void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
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bool direction, bool sync) { unsigned long flags; spin_lock_irqsave(&blkg->stats_lock, flags); blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], direction, sync); spin_unlock_irqrestore(&blkg->stats_lock, flags); } |
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EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats); |
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void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time, unsigned long unaccounted_time) |
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{ |
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unsigned long flags; spin_lock_irqsave(&blkg->stats_lock, flags); blkg->stats.time += time; |
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#ifdef CONFIG_DEBUG_BLK_CGROUP |
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blkg->stats.unaccounted_time += unaccounted_time; |
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#endif |
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spin_unlock_irqrestore(&blkg->stats_lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); |
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/* * should be called under rcu read lock or queue lock to make sure blkg pointer * is valid. */ |
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void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes, bool direction, bool sync) |
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{ |
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struct blkio_group_stats_cpu *stats_cpu; |
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unsigned long flags; /* * Disabling interrupts to provide mutual exclusion between two * writes on same cpu. It probably is not needed for 64bit. Not * optimizing that case yet. */ local_irq_save(flags); |
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stats_cpu = this_cpu_ptr(blkg->stats_cpu); |
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u64_stats_update_begin(&stats_cpu->syncp); |
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stats_cpu->sectors += bytes >> 9; blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICED], 1, direction, sync); blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICE_BYTES], bytes, direction, sync); |
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u64_stats_update_end(&stats_cpu->syncp); local_irq_restore(flags); |
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} |
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EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats); |
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void blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) |
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{ struct blkio_group_stats *stats; unsigned long flags; unsigned long long now = sched_clock(); spin_lock_irqsave(&blkg->stats_lock, flags); stats = &blkg->stats; |
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if (time_after64(now, io_start_time)) blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME], now - io_start_time, direction, sync); if (time_after64(io_start_time, start_time)) blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME], io_start_time - start_time, direction, sync); |
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spin_unlock_irqrestore(&blkg->stats_lock, flags); } |
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EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats); |
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/* Merged stats are per cpu. */ |
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void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, bool sync) { |
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struct blkio_group_stats_cpu *stats_cpu; |
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unsigned long flags; |
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/* * Disabling interrupts to provide mutual exclusion between two * writes on same cpu. It probably is not needed for 64bit. Not * optimizing that case yet. */ local_irq_save(flags); stats_cpu = this_cpu_ptr(blkg->stats_cpu); u64_stats_update_begin(&stats_cpu->syncp); blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1, direction, sync); u64_stats_update_end(&stats_cpu->syncp); local_irq_restore(flags); |
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} EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats); |
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/* * This function allocates the per cpu stats for blkio_group. Should be called * from sleepable context as alloc_per_cpu() requires that. */ int blkio_alloc_blkg_stats(struct blkio_group *blkg) { /* Allocate memory for per cpu stats */ blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu); if (!blkg->stats_cpu) return -ENOMEM; return 0; } EXPORT_SYMBOL_GPL(blkio_alloc_blkg_stats); |
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void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
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struct blkio_group *blkg, void *key, dev_t dev, enum blkio_policy_id plid) |
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{ unsigned long flags; spin_lock_irqsave(&blkcg->lock, flags); |
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spin_lock_init(&blkg->stats_lock); |
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rcu_assign_pointer(blkg->key, key); |
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blkg->blkcg_id = css_id(&blkcg->css); |
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hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list); |
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blkg->plid = plid; |
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spin_unlock_irqrestore(&blkcg->lock, flags); |
2868ef7b3 blkio: Some debug... |
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/* Need to take css reference ? */ cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path)); |
220841906 blkio: Export dis... |
473 |
blkg->dev = dev; |
31e4c28d9 blkio: Introduce ... |
474 |
} |
9d6a986c0 blkio: Export som... |
475 |
EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group); |
31e4c28d9 blkio: Introduce ... |
476 |
|
b1c357696 blkio: Take care ... |
477 478 479 480 481 482 483 484 485 486 |
static void __blkiocg_del_blkio_group(struct blkio_group *blkg) { hlist_del_init_rcu(&blkg->blkcg_node); blkg->blkcg_id = 0; } /* * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1 * indicating that blk_group was unhashed by the time we got to it. */ |
31e4c28d9 blkio: Introduce ... |
487 488 |
int blkiocg_del_blkio_group(struct blkio_group *blkg) { |
b1c357696 blkio: Take care ... |
489 490 491 492 493 494 495 |
struct blkio_cgroup *blkcg; unsigned long flags; struct cgroup_subsys_state *css; int ret = 1; rcu_read_lock(); css = css_lookup(&blkio_subsys, blkg->blkcg_id); |
0f3942a39 block: kill some ... |
496 497 498 499 500 501 502 503 |
if (css) { blkcg = container_of(css, struct blkio_cgroup, css); spin_lock_irqsave(&blkcg->lock, flags); if (!hlist_unhashed(&blkg->blkcg_node)) { __blkiocg_del_blkio_group(blkg); ret = 0; } spin_unlock_irqrestore(&blkcg->lock, flags); |
b1c357696 blkio: Take care ... |
504 |
} |
0f3942a39 block: kill some ... |
505 |
|
b1c357696 blkio: Take care ... |
506 507 |
rcu_read_unlock(); return ret; |
31e4c28d9 blkio: Introduce ... |
508 |
} |
9d6a986c0 blkio: Export som... |
509 |
EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group); |
31e4c28d9 blkio: Introduce ... |
510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 |
/* called under rcu_read_lock(). */ struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { struct blkio_group *blkg; struct hlist_node *n; void *__key; hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { __key = blkg->key; if (__key == key) return blkg; } return NULL; } |
9d6a986c0 blkio: Export som... |
526 |
EXPORT_SYMBOL_GPL(blkiocg_lookup_group); |
31e4c28d9 blkio: Introduce ... |
527 |
|
f0bdc8cdd blk-cgroup: Make ... |
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 |
static void blkio_reset_stats_cpu(struct blkio_group *blkg) { struct blkio_group_stats_cpu *stats_cpu; int i, j, k; /* * Note: On 64 bit arch this should not be an issue. This has the * possibility of returning some inconsistent value on 32bit arch * as 64bit update on 32bit is non atomic. Taking care of this * corner case makes code very complicated, like sending IPIs to * cpus, taking care of stats of offline cpus etc. * * reset stats is anyway more of a debug feature and this sounds a * corner case. So I am not complicating the code yet until and * unless this becomes a real issue. */ for_each_possible_cpu(i) { stats_cpu = per_cpu_ptr(blkg->stats_cpu, i); stats_cpu->sectors = 0; for(j = 0; j < BLKIO_STAT_CPU_NR; j++) for (k = 0; k < BLKIO_STAT_TOTAL; k++) stats_cpu->stat_arr_cpu[j][k] = 0; } } |
303a3acb2 blkio: Add io con... |
551 |
static int |
84c124da9 blkio: Changes to... |
552 |
blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val) |
303a3acb2 blkio: Add io con... |
553 554 555 |
{ struct blkio_cgroup *blkcg; struct blkio_group *blkg; |
812df48d1 blkio: Add more d... |
556 |
struct blkio_group_stats *stats; |
303a3acb2 blkio: Add io con... |
557 |
struct hlist_node *n; |
cdc1184cf blkio: Add io_que... |
558 559 |
uint64_t queued[BLKIO_STAT_TOTAL]; int i; |
812df48d1 blkio: Add more d... |
560 561 562 563 |
#ifdef CONFIG_DEBUG_BLK_CGROUP bool idling, waiting, empty; unsigned long long now = sched_clock(); #endif |
303a3acb2 blkio: Add io con... |
564 565 566 567 568 |
blkcg = cgroup_to_blkio_cgroup(cgroup); spin_lock_irq(&blkcg->lock); hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { spin_lock(&blkg->stats_lock); |
812df48d1 blkio: Add more d... |
569 570 571 572 573 574 |
stats = &blkg->stats; #ifdef CONFIG_DEBUG_BLK_CGROUP idling = blkio_blkg_idling(stats); waiting = blkio_blkg_waiting(stats); empty = blkio_blkg_empty(stats); #endif |
cdc1184cf blkio: Add io_que... |
575 |
for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d1 blkio: Add more d... |
576 577 |
queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i]; memset(stats, 0, sizeof(struct blkio_group_stats)); |
cdc1184cf blkio: Add io_que... |
578 |
for (i = 0; i < BLKIO_STAT_TOTAL; i++) |
812df48d1 blkio: Add more d... |
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 |
stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i]; #ifdef CONFIG_DEBUG_BLK_CGROUP if (idling) { blkio_mark_blkg_idling(stats); stats->start_idle_time = now; } if (waiting) { blkio_mark_blkg_waiting(stats); stats->start_group_wait_time = now; } if (empty) { blkio_mark_blkg_empty(stats); stats->start_empty_time = now; } #endif |
303a3acb2 blkio: Add io con... |
594 |
spin_unlock(&blkg->stats_lock); |
f0bdc8cdd blk-cgroup: Make ... |
595 596 597 |
/* Reset Per cpu stats which don't take blkg->stats_lock */ blkio_reset_stats_cpu(blkg); |
303a3acb2 blkio: Add io con... |
598 |
} |
f0bdc8cdd blk-cgroup: Make ... |
599 |
|
303a3acb2 blkio: Add io con... |
600 601 602 |
spin_unlock_irq(&blkcg->lock); return 0; } |
84c124da9 blkio: Changes to... |
603 604 |
static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str, int chars_left, bool diskname_only) |
303a3acb2 blkio: Add io con... |
605 |
{ |
84c124da9 blkio: Changes to... |
606 |
snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev)); |
303a3acb2 blkio: Add io con... |
607 608 609 610 611 612 |
chars_left -= strlen(str); if (chars_left <= 0) { printk(KERN_WARNING "Possibly incorrect cgroup stat display format"); return; } |
84c124da9 blkio: Changes to... |
613 614 |
if (diskname_only) return; |
303a3acb2 blkio: Add io con... |
615 |
switch (type) { |
84c124da9 blkio: Changes to... |
616 |
case BLKIO_STAT_READ: |
303a3acb2 blkio: Add io con... |
617 618 |
strlcat(str, " Read", chars_left); break; |
84c124da9 blkio: Changes to... |
619 |
case BLKIO_STAT_WRITE: |
303a3acb2 blkio: Add io con... |
620 621 |
strlcat(str, " Write", chars_left); break; |
84c124da9 blkio: Changes to... |
622 |
case BLKIO_STAT_SYNC: |
303a3acb2 blkio: Add io con... |
623 624 |
strlcat(str, " Sync", chars_left); break; |
84c124da9 blkio: Changes to... |
625 |
case BLKIO_STAT_ASYNC: |
303a3acb2 blkio: Add io con... |
626 627 |
strlcat(str, " Async", chars_left); break; |
84c124da9 blkio: Changes to... |
628 |
case BLKIO_STAT_TOTAL: |
303a3acb2 blkio: Add io con... |
629 630 631 632 633 634 |
strlcat(str, " Total", chars_left); break; default: strlcat(str, " Invalid", chars_left); } } |
84c124da9 blkio: Changes to... |
635 636 637 638 639 640 641 |
static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val, struct cgroup_map_cb *cb, dev_t dev) { blkio_get_key_name(0, dev, str, chars_left, true); cb->fill(cb, str, val); return val; } |
303a3acb2 blkio: Add io con... |
642 |
|
5624a4e44 blk-throttle: Mak... |
643 644 645 646 647 648 |
static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg, enum stat_type_cpu type, enum stat_sub_type sub_type) { int cpu; struct blkio_group_stats_cpu *stats_cpu; |
575969a0d blk-cgroup: Make ... |
649 |
u64 val = 0, tval; |
5624a4e44 blk-throttle: Mak... |
650 651 |
for_each_possible_cpu(cpu) { |
575969a0d blk-cgroup: Make ... |
652 |
unsigned int start; |
5624a4e44 blk-throttle: Mak... |
653 |
stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu); |
575969a0d blk-cgroup: Make ... |
654 655 656 657 658 659 660 661 662 |
do { start = u64_stats_fetch_begin(&stats_cpu->syncp); if (type == BLKIO_STAT_CPU_SECTORS) tval = stats_cpu->sectors; else tval = stats_cpu->stat_arr_cpu[type][sub_type]; } while(u64_stats_fetch_retry(&stats_cpu->syncp, start)); val += tval; |
5624a4e44 blk-throttle: Mak... |
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 |
} return val; } static uint64_t blkio_get_stat_cpu(struct blkio_group *blkg, struct cgroup_map_cb *cb, dev_t dev, enum stat_type_cpu type) { uint64_t disk_total, val; char key_str[MAX_KEY_LEN]; enum stat_sub_type sub_type; if (type == BLKIO_STAT_CPU_SECTORS) { val = blkio_read_stat_cpu(blkg, type, 0); return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, val, cb, dev); } for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; sub_type++) { blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); val = blkio_read_stat_cpu(blkg, type, sub_type); cb->fill(cb, key_str, val); } disk_total = blkio_read_stat_cpu(blkg, type, BLKIO_STAT_READ) + blkio_read_stat_cpu(blkg, type, BLKIO_STAT_WRITE); blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); cb->fill(cb, key_str, disk_total); return disk_total; } |
84c124da9 blkio: Changes to... |
694 695 696 |
/* This should be called with blkg->stats_lock held */ static uint64_t blkio_get_stat(struct blkio_group *blkg, struct cgroup_map_cb *cb, dev_t dev, enum stat_type type) |
303a3acb2 blkio: Add io con... |
697 698 699 |
{ uint64_t disk_total; char key_str[MAX_KEY_LEN]; |
84c124da9 blkio: Changes to... |
700 701 702 703 704 |
enum stat_sub_type sub_type; if (type == BLKIO_STAT_TIME) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.time, cb, dev); |
9026e521c blk-cgroup: Only ... |
705 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
167400d34 blk-cgroup: Add u... |
706 707 708 |
if (type == BLKIO_STAT_UNACCOUNTED_TIME) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.unaccounted_time, cb, dev); |
cdc1184cf blkio: Add io_que... |
709 710 711 712 713 714 715 716 717 |
if (type == BLKIO_STAT_AVG_QUEUE_SIZE) { uint64_t sum = blkg->stats.avg_queue_size_sum; uint64_t samples = blkg->stats.avg_queue_size_samples; if (samples) do_div(sum, samples); else sum = 0; return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev); } |
812df48d1 blkio: Add more d... |
718 719 720 721 722 723 724 725 726 |
if (type == BLKIO_STAT_GROUP_WAIT_TIME) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.group_wait_time, cb, dev); if (type == BLKIO_STAT_IDLE_TIME) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.idle_time, cb, dev); if (type == BLKIO_STAT_EMPTY_TIME) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.empty_time, cb, dev); |
84c124da9 blkio: Changes to... |
727 728 729 730 |
if (type == BLKIO_STAT_DEQUEUE) return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, blkg->stats.dequeue, cb, dev); #endif |
303a3acb2 blkio: Add io con... |
731 |
|
84c124da9 blkio: Changes to... |
732 733 734 735 |
for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL; sub_type++) { blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false); cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]); |
303a3acb2 blkio: Add io con... |
736 |
} |
84c124da9 blkio: Changes to... |
737 738 739 |
disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] + blkg->stats.stat_arr[type][BLKIO_STAT_WRITE]; blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false); |
303a3acb2 blkio: Add io con... |
740 741 742 |
cb->fill(cb, key_str, disk_total); return disk_total; } |
34d0f179d io-controller: Ad... |
743 |
static int blkio_policy_parse_and_set(char *buf, |
062a644d6 blk-cgroup: Prepa... |
744 |
struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid) |
34d0f179d io-controller: Ad... |
745 |
{ |
ece84241b block: fix genhd ... |
746 |
struct gendisk *disk = NULL; |
34d0f179d io-controller: Ad... |
747 |
char *s[4], *p, *major_s = NULL, *minor_s = NULL; |
d11bb4462 blk-cgroup: be ab... |
748 |
unsigned long major, minor; |
ece84241b block: fix genhd ... |
749 750 |
int i = 0, ret = -EINVAL; int part; |
34d0f179d io-controller: Ad... |
751 |
dev_t dev; |
d11bb4462 blk-cgroup: be ab... |
752 |
u64 temp; |
34d0f179d io-controller: Ad... |
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 |
memset(s, 0, sizeof(s)); while ((p = strsep(&buf, " ")) != NULL) { if (!*p) continue; s[i++] = p; /* Prevent from inputing too many things */ if (i == 3) break; } if (i != 2) |
ece84241b block: fix genhd ... |
768 |
goto out; |
34d0f179d io-controller: Ad... |
769 770 771 772 773 |
p = strsep(&s[0], ":"); if (p != NULL) major_s = p; else |
ece84241b block: fix genhd ... |
774 |
goto out; |
34d0f179d io-controller: Ad... |
775 776 777 |
minor_s = s[0]; if (!minor_s) |
ece84241b block: fix genhd ... |
778 |
goto out; |
34d0f179d io-controller: Ad... |
779 |
|
ece84241b block: fix genhd ... |
780 781 |
if (strict_strtoul(major_s, 10, &major)) goto out; |
34d0f179d io-controller: Ad... |
782 |
|
ece84241b block: fix genhd ... |
783 784 |
if (strict_strtoul(minor_s, 10, &minor)) goto out; |
34d0f179d io-controller: Ad... |
785 786 |
dev = MKDEV(major, minor); |
ece84241b block: fix genhd ... |
787 788 |
if (strict_strtoull(s[1], 10, &temp)) goto out; |
34d0f179d io-controller: Ad... |
789 |
|
d11bb4462 blk-cgroup: be ab... |
790 791 |
/* For rule removal, do not check for device presence. */ if (temp) { |
ece84241b block: fix genhd ... |
792 793 794 795 796 |
disk = get_gendisk(dev, &part); if (!disk || part) { ret = -ENODEV; goto out; } |
d11bb4462 blk-cgroup: be ab... |
797 |
} |
34d0f179d io-controller: Ad... |
798 |
|
d11bb4462 blk-cgroup: be ab... |
799 |
newpn->dev = dev; |
34d0f179d io-controller: Ad... |
800 |
|
062a644d6 blk-cgroup: Prepa... |
801 802 |
switch (plid) { case BLKIO_POLICY_PROP: |
d11bb4462 blk-cgroup: be ab... |
803 804 |
if ((temp < BLKIO_WEIGHT_MIN && temp > 0) || temp > BLKIO_WEIGHT_MAX) |
ece84241b block: fix genhd ... |
805 |
goto out; |
34d0f179d io-controller: Ad... |
806 |
|
062a644d6 blk-cgroup: Prepa... |
807 808 |
newpn->plid = plid; newpn->fileid = fileid; |
4c9eefa16 blk-cgroup: Intro... |
809 810 811 |
newpn->val.weight = temp; break; case BLKIO_POLICY_THROTL: |
7702e8f45 blk-cgroup: cgrou... |
812 813 814 |
switch(fileid) { case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: |
7702e8f45 blk-cgroup: cgrou... |
815 816 |
newpn->plid = plid; newpn->fileid = fileid; |
d11bb4462 blk-cgroup: be ab... |
817 |
newpn->val.bps = temp; |
7702e8f45 blk-cgroup: cgrou... |
818 819 820 |
break; case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: |
d11bb4462 blk-cgroup: be ab... |
821 |
if (temp > THROTL_IOPS_MAX) |
ece84241b block: fix genhd ... |
822 |
goto out; |
9355aede5 blkio-throttle: l... |
823 |
|
7702e8f45 blk-cgroup: cgrou... |
824 825 |
newpn->plid = plid; newpn->fileid = fileid; |
d11bb4462 blk-cgroup: be ab... |
826 |
newpn->val.iops = (unsigned int)temp; |
7702e8f45 blk-cgroup: cgrou... |
827 828 |
break; } |
062a644d6 blk-cgroup: Prepa... |
829 830 831 832 |
break; default: BUG(); } |
ece84241b block: fix genhd ... |
833 834 835 836 |
ret = 0; out: put_disk(disk); return ret; |
34d0f179d io-controller: Ad... |
837 838 839 840 841 842 |
} unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, dev_t dev) { struct blkio_policy_node *pn; |
a38eb630f blk-throttle: Tak... |
843 844 845 846 |
unsigned long flags; unsigned int weight; spin_lock_irqsave(&blkcg->lock, flags); |
34d0f179d io-controller: Ad... |
847 |
|
062a644d6 blk-cgroup: Prepa... |
848 849 |
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); |
34d0f179d io-controller: Ad... |
850 |
if (pn) |
a38eb630f blk-throttle: Tak... |
851 |
weight = pn->val.weight; |
34d0f179d io-controller: Ad... |
852 |
else |
a38eb630f blk-throttle: Tak... |
853 854 855 856 857 |
weight = blkcg->weight; spin_unlock_irqrestore(&blkcg->lock, flags); return weight; |
34d0f179d io-controller: Ad... |
858 859 |
} EXPORT_SYMBOL_GPL(blkcg_get_weight); |
4c9eefa16 blk-cgroup: Intro... |
860 861 862 |
uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev) { struct blkio_policy_node *pn; |
a38eb630f blk-throttle: Tak... |
863 864 |
unsigned long flags; uint64_t bps = -1; |
4c9eefa16 blk-cgroup: Intro... |
865 |
|
a38eb630f blk-throttle: Tak... |
866 |
spin_lock_irqsave(&blkcg->lock, flags); |
4c9eefa16 blk-cgroup: Intro... |
867 868 869 |
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, BLKIO_THROTL_read_bps_device); if (pn) |
a38eb630f blk-throttle: Tak... |
870 871 872 873 |
bps = pn->val.bps; spin_unlock_irqrestore(&blkcg->lock, flags); return bps; |
4c9eefa16 blk-cgroup: Intro... |
874 875 876 877 878 |
} uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev) { struct blkio_policy_node *pn; |
a38eb630f blk-throttle: Tak... |
879 880 881 882 |
unsigned long flags; uint64_t bps = -1; spin_lock_irqsave(&blkcg->lock, flags); |
4c9eefa16 blk-cgroup: Intro... |
883 884 885 |
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, BLKIO_THROTL_write_bps_device); if (pn) |
a38eb630f blk-throttle: Tak... |
886 887 888 889 |
bps = pn->val.bps; spin_unlock_irqrestore(&blkcg->lock, flags); return bps; |
4c9eefa16 blk-cgroup: Intro... |
890 |
} |
7702e8f45 blk-cgroup: cgrou... |
891 892 893 |
unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev) { struct blkio_policy_node *pn; |
a38eb630f blk-throttle: Tak... |
894 895 |
unsigned long flags; unsigned int iops = -1; |
7702e8f45 blk-cgroup: cgrou... |
896 |
|
a38eb630f blk-throttle: Tak... |
897 |
spin_lock_irqsave(&blkcg->lock, flags); |
7702e8f45 blk-cgroup: cgrou... |
898 899 900 |
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, BLKIO_THROTL_read_iops_device); if (pn) |
a38eb630f blk-throttle: Tak... |
901 902 903 904 |
iops = pn->val.iops; spin_unlock_irqrestore(&blkcg->lock, flags); return iops; |
7702e8f45 blk-cgroup: cgrou... |
905 906 907 908 909 |
} unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev) { struct blkio_policy_node *pn; |
a38eb630f blk-throttle: Tak... |
910 911 912 913 |
unsigned long flags; unsigned int iops = -1; spin_lock_irqsave(&blkcg->lock, flags); |
7702e8f45 blk-cgroup: cgrou... |
914 915 916 |
pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL, BLKIO_THROTL_write_iops_device); if (pn) |
a38eb630f blk-throttle: Tak... |
917 918 919 920 |
iops = pn->val.iops; spin_unlock_irqrestore(&blkcg->lock, flags); return iops; |
7702e8f45 blk-cgroup: cgrou... |
921 |
} |
062a644d6 blk-cgroup: Prepa... |
922 923 924 925 926 |
/* Checks whether user asked for deleting a policy rule */ static bool blkio_delete_rule_command(struct blkio_policy_node *pn) { switch(pn->plid) { case BLKIO_POLICY_PROP: |
4c9eefa16 blk-cgroup: Intro... |
927 928 929 930 |
if (pn->val.weight == 0) return 1; break; case BLKIO_POLICY_THROTL: |
7702e8f45 blk-cgroup: cgrou... |
931 932 933 934 935 936 937 938 939 940 941 |
switch(pn->fileid) { case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: if (pn->val.bps == 0) return 1; break; case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: if (pn->val.iops == 0) return 1; } |
062a644d6 blk-cgroup: Prepa... |
942 943 944 945 946 947 948 949 950 951 952 953 954 |
break; default: BUG(); } return 0; } static void blkio_update_policy_rule(struct blkio_policy_node *oldpn, struct blkio_policy_node *newpn) { switch(oldpn->plid) { case BLKIO_POLICY_PROP: |
4c9eefa16 blk-cgroup: Intro... |
955 956 957 |
oldpn->val.weight = newpn->val.weight; break; case BLKIO_POLICY_THROTL: |
7702e8f45 blk-cgroup: cgrou... |
958 959 960 961 962 963 964 965 966 |
switch(newpn->fileid) { case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: oldpn->val.bps = newpn->val.bps; break; case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: oldpn->val.iops = newpn->val.iops; } |
062a644d6 blk-cgroup: Prepa... |
967 968 969 970 971 972 973 |
break; default: BUG(); } } /* |
25985edce Fix common misspe... |
974 |
* Some rules/values in blkg have changed. Propagate those to respective |
062a644d6 blk-cgroup: Prepa... |
975 976 977 978 979 |
* policies. */ static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg, struct blkio_group *blkg, struct blkio_policy_node *pn) { |
7702e8f45 blk-cgroup: cgrou... |
980 |
unsigned int weight, iops; |
4c9eefa16 blk-cgroup: Intro... |
981 |
u64 bps; |
062a644d6 blk-cgroup: Prepa... |
982 983 984 |
switch(pn->plid) { case BLKIO_POLICY_PROP: |
4c9eefa16 blk-cgroup: Intro... |
985 |
weight = pn->val.weight ? pn->val.weight : |
062a644d6 blk-cgroup: Prepa... |
986 987 988 |
blkcg->weight; blkio_update_group_weight(blkg, weight); break; |
4c9eefa16 blk-cgroup: Intro... |
989 990 991 992 993 994 995 |
case BLKIO_POLICY_THROTL: switch(pn->fileid) { case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: bps = pn->val.bps ? pn->val.bps : (-1); blkio_update_group_bps(blkg, bps, pn->fileid); break; |
7702e8f45 blk-cgroup: cgrou... |
996 997 998 999 1000 |
case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: iops = pn->val.iops ? pn->val.iops : (-1); blkio_update_group_iops(blkg, iops, pn->fileid); break; |
4c9eefa16 blk-cgroup: Intro... |
1001 1002 |
} break; |
062a644d6 blk-cgroup: Prepa... |
1003 1004 1005 1006 1007 1008 |
default: BUG(); } } /* |
25985edce Fix common misspe... |
1009 |
* A policy node rule has been updated. Propagate this update to all the |
062a644d6 blk-cgroup: Prepa... |
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 |
* block groups which might be affected by this update. */ static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg, struct blkio_policy_node *pn) { struct blkio_group *blkg; struct hlist_node *n; spin_lock(&blkio_list_lock); spin_lock_irq(&blkcg->lock); |
34d0f179d io-controller: Ad... |
1020 |
|
062a644d6 blk-cgroup: Prepa... |
1021 1022 1023 1024 1025 1026 1027 1028 1029 |
hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { if (pn->dev != blkg->dev || pn->plid != blkg->plid) continue; blkio_update_blkg_policy(blkcg, blkg, pn); } spin_unlock_irq(&blkcg->lock); spin_unlock(&blkio_list_lock); } |
34d0f179d io-controller: Ad... |
1030 |
|
062a644d6 blk-cgroup: Prepa... |
1031 1032 |
static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft, const char *buffer) |
34d0f179d io-controller: Ad... |
1033 1034 1035 1036 1037 |
{ int ret = 0; char *buf; struct blkio_policy_node *newpn, *pn; struct blkio_cgroup *blkcg; |
34d0f179d io-controller: Ad... |
1038 |
int keep_newpn = 0; |
062a644d6 blk-cgroup: Prepa... |
1039 1040 |
enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int fileid = BLKIOFILE_ATTR(cft->private); |
34d0f179d io-controller: Ad... |
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
buf = kstrdup(buffer, GFP_KERNEL); if (!buf) return -ENOMEM; newpn = kzalloc(sizeof(*newpn), GFP_KERNEL); if (!newpn) { ret = -ENOMEM; goto free_buf; } |
062a644d6 blk-cgroup: Prepa... |
1051 |
ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid); |
34d0f179d io-controller: Ad... |
1052 1053 1054 1055 1056 1057 |
if (ret) goto free_newpn; blkcg = cgroup_to_blkio_cgroup(cgrp); spin_lock_irq(&blkcg->lock); |
062a644d6 blk-cgroup: Prepa... |
1058 |
pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid); |
34d0f179d io-controller: Ad... |
1059 |
if (!pn) { |
062a644d6 blk-cgroup: Prepa... |
1060 |
if (!blkio_delete_rule_command(newpn)) { |
34d0f179d io-controller: Ad... |
1061 1062 1063 1064 1065 1066 |
blkio_policy_insert_node(blkcg, newpn); keep_newpn = 1; } spin_unlock_irq(&blkcg->lock); goto update_io_group; } |
062a644d6 blk-cgroup: Prepa... |
1067 |
if (blkio_delete_rule_command(newpn)) { |
34d0f179d io-controller: Ad... |
1068 |
blkio_policy_delete_node(pn); |
e060f00be blk-throttle: Fre... |
1069 |
kfree(pn); |
34d0f179d io-controller: Ad... |
1070 1071 1072 1073 |
spin_unlock_irq(&blkcg->lock); goto update_io_group; } spin_unlock_irq(&blkcg->lock); |
062a644d6 blk-cgroup: Prepa... |
1074 |
blkio_update_policy_rule(pn, newpn); |
34d0f179d io-controller: Ad... |
1075 1076 |
update_io_group: |
062a644d6 blk-cgroup: Prepa... |
1077 |
blkio_update_policy_node_blkg(blkcg, newpn); |
34d0f179d io-controller: Ad... |
1078 1079 1080 1081 1082 1083 1084 1085 |
free_newpn: if (!keep_newpn) kfree(newpn); free_buf: kfree(buf); return ret; } |
062a644d6 blk-cgroup: Prepa... |
1086 1087 |
static void blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn) |
34d0f179d io-controller: Ad... |
1088 |
{ |
062a644d6 blk-cgroup: Prepa... |
1089 1090 1091 1092 1093 |
switch(pn->plid) { case BLKIO_POLICY_PROP: if (pn->fileid == BLKIO_PROP_weight_device) seq_printf(m, "%u:%u\t%u ", MAJOR(pn->dev), |
4c9eefa16 blk-cgroup: Intro... |
1094 1095 1096 |
MINOR(pn->dev), pn->val.weight); break; case BLKIO_POLICY_THROTL: |
7702e8f45 blk-cgroup: cgrou... |
1097 1098 1099 |
switch(pn->fileid) { case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: |
4c9eefa16 blk-cgroup: Intro... |
1100 1101 1102 |
seq_printf(m, "%u:%u\t%llu ", MAJOR(pn->dev), MINOR(pn->dev), pn->val.bps); |
7702e8f45 blk-cgroup: cgrou... |
1103 1104 1105 1106 1107 1108 1109 1110 |
break; case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: seq_printf(m, "%u:%u\t%u ", MAJOR(pn->dev), MINOR(pn->dev), pn->val.iops); break; } |
062a644d6 blk-cgroup: Prepa... |
1111 1112 1113 1114 1115 |
break; default: BUG(); } } |
34d0f179d io-controller: Ad... |
1116 |
|
062a644d6 blk-cgroup: Prepa... |
1117 1118 1119 |
/* cgroup files which read their data from policy nodes end up here */ static void blkio_read_policy_node_files(struct cftype *cft, struct blkio_cgroup *blkcg, struct seq_file *m) |
34d0f179d io-controller: Ad... |
1120 |
{ |
34d0f179d io-controller: Ad... |
1121 |
struct blkio_policy_node *pn; |
34d0f179d io-controller: Ad... |
1122 |
|
0f3942a39 block: kill some ... |
1123 1124 1125 |
if (!list_empty(&blkcg->policy_list)) { spin_lock_irq(&blkcg->lock); list_for_each_entry(pn, &blkcg->policy_list, node) { |
062a644d6 blk-cgroup: Prepa... |
1126 1127 1128 |
if (!pn_matches_cftype(cft, pn)) continue; blkio_print_policy_node(m, pn); |
0f3942a39 block: kill some ... |
1129 1130 |
} spin_unlock_irq(&blkcg->lock); |
34d0f179d io-controller: Ad... |
1131 |
} |
062a644d6 blk-cgroup: Prepa... |
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 |
} static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft, struct seq_file *m) { struct blkio_cgroup *blkcg; enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int name = BLKIOFILE_ATTR(cft->private); blkcg = cgroup_to_blkio_cgroup(cgrp); switch(plid) { case BLKIO_POLICY_PROP: switch(name) { case BLKIO_PROP_weight_device: blkio_read_policy_node_files(cft, blkcg, m); return 0; default: BUG(); } break; |
4c9eefa16 blk-cgroup: Intro... |
1153 1154 1155 1156 |
case BLKIO_POLICY_THROTL: switch(name){ case BLKIO_THROTL_read_bps_device: case BLKIO_THROTL_write_bps_device: |
7702e8f45 blk-cgroup: cgrou... |
1157 1158 |
case BLKIO_THROTL_read_iops_device: case BLKIO_THROTL_write_iops_device: |
4c9eefa16 blk-cgroup: Intro... |
1159 1160 1161 1162 1163 1164 |
blkio_read_policy_node_files(cft, blkcg, m); return 0; default: BUG(); } break; |
062a644d6 blk-cgroup: Prepa... |
1165 1166 1167 1168 1169 1170 1171 1172 |
default: BUG(); } return 0; } static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg, |
5624a4e44 blk-throttle: Mak... |
1173 1174 |
struct cftype *cft, struct cgroup_map_cb *cb, enum stat_type type, bool show_total, bool pcpu) |
062a644d6 blk-cgroup: Prepa... |
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 |
{ struct blkio_group *blkg; struct hlist_node *n; uint64_t cgroup_total = 0; rcu_read_lock(); hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) { if (blkg->dev) { if (!cftype_blkg_same_policy(cft, blkg)) continue; |
5624a4e44 blk-throttle: Mak... |
1185 1186 1187 1188 1189 1190 1191 1192 1193 |
if (pcpu) cgroup_total += blkio_get_stat_cpu(blkg, cb, blkg->dev, type); else { spin_lock_irq(&blkg->stats_lock); cgroup_total += blkio_get_stat(blkg, cb, blkg->dev, type); spin_unlock_irq(&blkg->stats_lock); } |
062a644d6 blk-cgroup: Prepa... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 |
} } if (show_total) cb->fill(cb, "Total", cgroup_total); rcu_read_unlock(); return 0; } /* All map kind of cgroup file get serviced by this function */ static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft, struct cgroup_map_cb *cb) { struct blkio_cgroup *blkcg; enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int name = BLKIOFILE_ATTR(cft->private); blkcg = cgroup_to_blkio_cgroup(cgrp); switch(plid) { case BLKIO_POLICY_PROP: switch(name) { case BLKIO_PROP_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1217 |
BLKIO_STAT_TIME, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1218 1219 |
case BLKIO_PROP_sectors: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1220 |
BLKIO_STAT_CPU_SECTORS, 0, 1); |
062a644d6 blk-cgroup: Prepa... |
1221 1222 |
case BLKIO_PROP_io_service_bytes: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1223 |
BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
062a644d6 blk-cgroup: Prepa... |
1224 1225 |
case BLKIO_PROP_io_serviced: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1226 |
BLKIO_STAT_CPU_SERVICED, 1, 1); |
062a644d6 blk-cgroup: Prepa... |
1227 1228 |
case BLKIO_PROP_io_service_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1229 |
BLKIO_STAT_SERVICE_TIME, 1, 0); |
062a644d6 blk-cgroup: Prepa... |
1230 1231 |
case BLKIO_PROP_io_wait_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1232 |
BLKIO_STAT_WAIT_TIME, 1, 0); |
062a644d6 blk-cgroup: Prepa... |
1233 1234 |
case BLKIO_PROP_io_merged: return blkio_read_blkg_stats(blkcg, cft, cb, |
317389a77 cfq-iosched: Make... |
1235 |
BLKIO_STAT_CPU_MERGED, 1, 1); |
062a644d6 blk-cgroup: Prepa... |
1236 1237 |
case BLKIO_PROP_io_queued: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1238 |
BLKIO_STAT_QUEUED, 1, 0); |
062a644d6 blk-cgroup: Prepa... |
1239 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
9026e521c blk-cgroup: Only ... |
1240 1241 |
case BLKIO_PROP_unaccounted_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1242 |
BLKIO_STAT_UNACCOUNTED_TIME, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1243 1244 |
case BLKIO_PROP_dequeue: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1245 |
BLKIO_STAT_DEQUEUE, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1246 1247 |
case BLKIO_PROP_avg_queue_size: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1248 |
BLKIO_STAT_AVG_QUEUE_SIZE, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1249 1250 |
case BLKIO_PROP_group_wait_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1251 |
BLKIO_STAT_GROUP_WAIT_TIME, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1252 1253 |
case BLKIO_PROP_idle_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1254 |
BLKIO_STAT_IDLE_TIME, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1255 1256 |
case BLKIO_PROP_empty_time: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1257 |
BLKIO_STAT_EMPTY_TIME, 0, 0); |
062a644d6 blk-cgroup: Prepa... |
1258 1259 1260 1261 1262 |
#endif default: BUG(); } break; |
4c9eefa16 blk-cgroup: Intro... |
1263 1264 1265 1266 |
case BLKIO_POLICY_THROTL: switch(name){ case BLKIO_THROTL_io_service_bytes: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1267 |
BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1); |
4c9eefa16 blk-cgroup: Intro... |
1268 1269 |
case BLKIO_THROTL_io_serviced: return blkio_read_blkg_stats(blkcg, cft, cb, |
5624a4e44 blk-throttle: Mak... |
1270 |
BLKIO_STAT_CPU_SERVICED, 1, 1); |
4c9eefa16 blk-cgroup: Intro... |
1271 1272 1273 1274 |
default: BUG(); } break; |
062a644d6 blk-cgroup: Prepa... |
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 |
default: BUG(); } return 0; } static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val) { struct blkio_group *blkg; struct hlist_node *n; struct blkio_policy_node *pn; if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX) return -EINVAL; spin_lock(&blkio_list_lock); spin_lock_irq(&blkcg->lock); blkcg->weight = (unsigned int)val; hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) { pn = blkio_policy_search_node(blkcg, blkg->dev, BLKIO_POLICY_PROP, BLKIO_PROP_weight_device); if (pn) continue; blkio_update_group_weight(blkg, blkcg->weight); } spin_unlock_irq(&blkcg->lock); spin_unlock(&blkio_list_lock); return 0; } static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) { struct blkio_cgroup *blkcg; enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int name = BLKIOFILE_ATTR(cft->private); blkcg = cgroup_to_blkio_cgroup(cgrp); switch(plid) { case BLKIO_POLICY_PROP: switch(name) { case BLKIO_PROP_weight: return (u64)blkcg->weight; } break; default: BUG(); } return 0; } static int blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val) { struct blkio_cgroup *blkcg; enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private); int name = BLKIOFILE_ATTR(cft->private); blkcg = cgroup_to_blkio_cgroup(cgrp); switch(plid) { case BLKIO_POLICY_PROP: switch(name) { case BLKIO_PROP_weight: return blkio_weight_write(blkcg, val); } break; default: BUG(); } |
34d0f179d io-controller: Ad... |
1347 |
|
34d0f179d io-controller: Ad... |
1348 1349 |
return 0; } |
31e4c28d9 blkio: Introduce ... |
1350 1351 |
struct cftype blkio_files[] = { { |
34d0f179d io-controller: Ad... |
1352 |
.name = "weight_device", |
062a644d6 blk-cgroup: Prepa... |
1353 1354 1355 1356 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_weight_device), .read_seq_string = blkiocg_file_read, .write_string = blkiocg_file_write, |
34d0f179d io-controller: Ad... |
1357 1358 1359 |
.max_write_len = 256, }, { |
31e4c28d9 blkio: Introduce ... |
1360 |
.name = "weight", |
062a644d6 blk-cgroup: Prepa... |
1361 1362 1363 1364 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_weight), .read_u64 = blkiocg_file_read_u64, .write_u64 = blkiocg_file_write_u64, |
31e4c28d9 blkio: Introduce ... |
1365 |
}, |
220841906 blkio: Export dis... |
1366 1367 |
{ .name = "time", |
062a644d6 blk-cgroup: Prepa... |
1368 1369 1370 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_time), .read_map = blkiocg_file_read_map, |
220841906 blkio: Export dis... |
1371 1372 1373 |
}, { .name = "sectors", |
062a644d6 blk-cgroup: Prepa... |
1374 1375 1376 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_sectors), .read_map = blkiocg_file_read_map, |
303a3acb2 blkio: Add io con... |
1377 1378 1379 |
}, { .name = "io_service_bytes", |
062a644d6 blk-cgroup: Prepa... |
1380 1381 1382 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_service_bytes), .read_map = blkiocg_file_read_map, |
303a3acb2 blkio: Add io con... |
1383 1384 1385 |
}, { .name = "io_serviced", |
062a644d6 blk-cgroup: Prepa... |
1386 1387 1388 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_serviced), .read_map = blkiocg_file_read_map, |
303a3acb2 blkio: Add io con... |
1389 1390 1391 |
}, { .name = "io_service_time", |
062a644d6 blk-cgroup: Prepa... |
1392 1393 1394 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_service_time), .read_map = blkiocg_file_read_map, |
303a3acb2 blkio: Add io con... |
1395 1396 1397 |
}, { .name = "io_wait_time", |
062a644d6 blk-cgroup: Prepa... |
1398 1399 1400 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_wait_time), .read_map = blkiocg_file_read_map, |
84c124da9 blkio: Changes to... |
1401 1402 |
}, { |
812d40264 blkio: Add io_mer... |
1403 |
.name = "io_merged", |
062a644d6 blk-cgroup: Prepa... |
1404 1405 1406 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_merged), .read_map = blkiocg_file_read_map, |
812d40264 blkio: Add io_mer... |
1407 1408 |
}, { |
cdc1184cf blkio: Add io_que... |
1409 |
.name = "io_queued", |
062a644d6 blk-cgroup: Prepa... |
1410 1411 1412 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_io_queued), .read_map = blkiocg_file_read_map, |
cdc1184cf blkio: Add io_que... |
1413 1414 |
}, { |
84c124da9 blkio: Changes to... |
1415 1416 |
.name = "reset_stats", .write_u64 = blkiocg_reset_stats, |
220841906 blkio: Export dis... |
1417 |
}, |
13f98250f blkio: Do not exp... |
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
#ifdef CONFIG_BLK_DEV_THROTTLING { .name = "throttle.read_bps_device", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_read_bps_device), .read_seq_string = blkiocg_file_read, .write_string = blkiocg_file_write, .max_write_len = 256, }, { .name = "throttle.write_bps_device", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_write_bps_device), .read_seq_string = blkiocg_file_read, .write_string = blkiocg_file_write, .max_write_len = 256, }, { .name = "throttle.read_iops_device", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_read_iops_device), .read_seq_string = blkiocg_file_read, .write_string = blkiocg_file_write, .max_write_len = 256, }, { .name = "throttle.write_iops_device", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_write_iops_device), .read_seq_string = blkiocg_file_read, .write_string = blkiocg_file_write, .max_write_len = 256, }, { .name = "throttle.io_service_bytes", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_io_service_bytes), .read_map = blkiocg_file_read_map, }, { .name = "throttle.io_serviced", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL, BLKIO_THROTL_io_serviced), .read_map = blkiocg_file_read_map, }, #endif /* CONFIG_BLK_DEV_THROTTLING */ |
220841906 blkio: Export dis... |
1467 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
cdc1184cf blkio: Add io_que... |
1468 1469 |
{ .name = "avg_queue_size", |
062a644d6 blk-cgroup: Prepa... |
1470 1471 1472 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_avg_queue_size), .read_map = blkiocg_file_read_map, |
cdc1184cf blkio: Add io_que... |
1473 1474 |
}, { |
812df48d1 blkio: Add more d... |
1475 |
.name = "group_wait_time", |
062a644d6 blk-cgroup: Prepa... |
1476 1477 1478 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_group_wait_time), .read_map = blkiocg_file_read_map, |
812df48d1 blkio: Add more d... |
1479 1480 1481 |
}, { .name = "idle_time", |
062a644d6 blk-cgroup: Prepa... |
1482 1483 1484 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_idle_time), .read_map = blkiocg_file_read_map, |
812df48d1 blkio: Add more d... |
1485 1486 1487 |
}, { .name = "empty_time", |
062a644d6 blk-cgroup: Prepa... |
1488 1489 1490 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_empty_time), .read_map = blkiocg_file_read_map, |
812df48d1 blkio: Add more d... |
1491 1492 |
}, { |
220841906 blkio: Export dis... |
1493 |
.name = "dequeue", |
062a644d6 blk-cgroup: Prepa... |
1494 1495 1496 |
.private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_dequeue), .read_map = blkiocg_file_read_map, |
cdc1184cf blkio: Add io_que... |
1497 |
}, |
9026e521c blk-cgroup: Only ... |
1498 1499 1500 1501 1502 1503 |
{ .name = "unaccounted_time", .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP, BLKIO_PROP_unaccounted_time), .read_map = blkiocg_file_read_map, }, |
220841906 blkio: Export dis... |
1504 |
#endif |
31e4c28d9 blkio: Introduce ... |
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 |
}; static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup) { return cgroup_add_files(cgroup, subsys, blkio_files, ARRAY_SIZE(blkio_files)); } static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup) { struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); |
b1c357696 blkio: Take care ... |
1516 1517 1518 |
unsigned long flags; struct blkio_group *blkg; void *key; |
3e2520668 blkio: Implement ... |
1519 |
struct blkio_policy_type *blkiop; |
34d0f179d io-controller: Ad... |
1520 |
struct blkio_policy_node *pn, *pntmp; |
b1c357696 blkio: Take care ... |
1521 1522 |
rcu_read_lock(); |
0f3942a39 block: kill some ... |
1523 1524 |
do { spin_lock_irqsave(&blkcg->lock, flags); |
b1c357696 blkio: Take care ... |
1525 |
|
0f3942a39 block: kill some ... |
1526 1527 1528 1529 |
if (hlist_empty(&blkcg->blkg_list)) { spin_unlock_irqrestore(&blkcg->lock, flags); break; } |
b1c357696 blkio: Take care ... |
1530 |
|
0f3942a39 block: kill some ... |
1531 1532 1533 1534 |
blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group, blkcg_node); key = rcu_dereference(blkg->key); __blkiocg_del_blkio_group(blkg); |
31e4c28d9 blkio: Introduce ... |
1535 |
|
0f3942a39 block: kill some ... |
1536 |
spin_unlock_irqrestore(&blkcg->lock, flags); |
b1c357696 blkio: Take care ... |
1537 |
|
0f3942a39 block: kill some ... |
1538 1539 1540 |
/* * This blkio_group is being unlinked as associated cgroup is * going away. Let all the IO controlling policies know about |
61014e96e blkio: deletion o... |
1541 |
* this event. |
0f3942a39 block: kill some ... |
1542 1543 |
*/ spin_lock(&blkio_list_lock); |
61014e96e blkio: deletion o... |
1544 1545 1546 |
list_for_each_entry(blkiop, &blkio_list, list) { if (blkiop->plid != blkg->plid) continue; |
0f3942a39 block: kill some ... |
1547 |
blkiop->ops.blkio_unlink_group_fn(key, blkg); |
61014e96e blkio: deletion o... |
1548 |
} |
0f3942a39 block: kill some ... |
1549 1550 |
spin_unlock(&blkio_list_lock); } while (1); |
34d0f179d io-controller: Ad... |
1551 |
|
34d0f179d io-controller: Ad... |
1552 1553 1554 1555 |
list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) { blkio_policy_delete_node(pn); kfree(pn); } |
0f3942a39 block: kill some ... |
1556 |
|
31e4c28d9 blkio: Introduce ... |
1557 |
free_css_id(&blkio_subsys, &blkcg->css); |
b1c357696 blkio: Take care ... |
1558 |
rcu_read_unlock(); |
67523c48a cgroups: blkio su... |
1559 1560 |
if (blkcg != &blkio_root_cgroup) kfree(blkcg); |
31e4c28d9 blkio: Introduce ... |
1561 1562 1563 1564 1565 |
} static struct cgroup_subsys_state * blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup) { |
0341509fd blk-cgroup: Fix a... |
1566 1567 |
struct blkio_cgroup *blkcg; struct cgroup *parent = cgroup->parent; |
31e4c28d9 blkio: Introduce ... |
1568 |
|
0341509fd blk-cgroup: Fix a... |
1569 |
if (!parent) { |
31e4c28d9 blkio: Introduce ... |
1570 1571 1572 |
blkcg = &blkio_root_cgroup; goto done; } |
31e4c28d9 blkio: Introduce ... |
1573 1574 1575 1576 1577 1578 1579 1580 |
blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL); if (!blkcg) return ERR_PTR(-ENOMEM); blkcg->weight = BLKIO_WEIGHT_DEFAULT; done: spin_lock_init(&blkcg->lock); INIT_HLIST_HEAD(&blkcg->blkg_list); |
34d0f179d io-controller: Ad... |
1581 |
INIT_LIST_HEAD(&blkcg->policy_list); |
31e4c28d9 blkio: Introduce ... |
1582 1583 1584 1585 1586 1587 1588 1589 1590 |
return &blkcg->css; } /* * We cannot support shared io contexts, as we have no mean to support * two tasks with the same ioc in two different groups without major rework * of the main cic data structures. For now we allow a task to change * its cgroup only if it's the only owner of its ioc. */ |
f780bdb7c cgroups: add per-... |
1591 |
static int blkiocg_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk) |
31e4c28d9 blkio: Introduce ... |
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 |
{ struct io_context *ioc; int ret = 0; /* task_lock() is needed to avoid races with exit_io_context() */ task_lock(tsk); ioc = tsk->io_context; if (ioc && atomic_read(&ioc->nr_tasks) > 1) ret = -EINVAL; task_unlock(tsk); return ret; } |
f780bdb7c cgroups: add per-... |
1605 |
static void blkiocg_attach_task(struct cgroup *cgrp, struct task_struct *tsk) |
31e4c28d9 blkio: Introduce ... |
1606 1607 1608 1609 1610 1611 1612 1613 1614 |
{ struct io_context *ioc; task_lock(tsk); ioc = tsk->io_context; if (ioc) ioc->cgroup_changed = 1; task_unlock(tsk); } |
3e2520668 blkio: Implement ... |
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 |
void blkio_policy_register(struct blkio_policy_type *blkiop) { spin_lock(&blkio_list_lock); list_add_tail(&blkiop->list, &blkio_list); spin_unlock(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_register); void blkio_policy_unregister(struct blkio_policy_type *blkiop) { spin_lock(&blkio_list_lock); list_del_init(&blkiop->list); spin_unlock(&blkio_list_lock); } EXPORT_SYMBOL_GPL(blkio_policy_unregister); |
67523c48a cgroups: blkio su... |
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 |
static int __init init_cgroup_blkio(void) { return cgroup_load_subsys(&blkio_subsys); } static void __exit exit_cgroup_blkio(void) { cgroup_unload_subsys(&blkio_subsys); } module_init(init_cgroup_blkio); module_exit(exit_cgroup_blkio); MODULE_LICENSE("GPL"); |