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block: make block cgroup policies follow bio task association 

Implement bio_blkio_cgroup() which returns the blkcg associated with
the bio if exists or %current's blkcg, and use it in blk-throttle and
cfq-iosched propio.  This makes both cgroup policies honor task
association for the bio instead of always assuming %current.

As nobody is using bio_set_task() yet, this doesn't introduce any
behavior change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-03-05 13:15:28 -08:00 committed by Jens Axboe
parent 852c788f83
commit 4f85cb96d9
4 changed files with 23 additions and 15 deletions
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11
block/blk-cgroup.c
View File

@ -71,12 +71,19 @@ struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
}
EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup);
struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk)
static 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);
struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio)
{
if (bio && bio->bi_css)
return container_of(bio->bi_css, struct blkio_cgroup, css);
return task_blkio_cgroup(current);
}
EXPORT_SYMBOL_GPL(bio_blkio_cgroup);
static inline void blkio_update_group_weight(struct blkio_group *blkg,
int plid, unsigned int weight)

4
block/blk-cgroup.h
View File

@ -379,7 +379,7 @@ static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg,
#ifdef CONFIG_BLK_CGROUP
extern struct blkio_cgroup blkio_root_cgroup;
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
struct request_queue *q);
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
@ -413,7 +413,7 @@ struct cgroup;
static inline struct blkio_cgroup *
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
static inline struct blkio_cgroup *
task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
bio_blkio_cgroup(struct bio *bio) { return NULL; }
static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
void *key) { return NULL; }

2
block/blk-throttle.c
View File

@ -900,7 +900,7 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
* just update the dispatch stats in lockless manner and return.
*/
rcu_read_lock();
blkcg = task_blkio_cgroup(current);
blkcg = bio_blkio_cgroup(bio);
tg = throtl_lookup_tg(td, blkcg);
if (tg) {
if (tg_no_rule_group(tg, rw)) {

21
block/cfq-iosched.c
View File

@ -467,8 +467,9 @@ static inline int cfqg_busy_async_queues(struct cfq_data *cfqd,
}
static void cfq_dispatch_insert(struct request_queue *, struct request *);
static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool,
struct io_context *, gfp_t);
static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync,
struct io_context *ioc, struct bio *bio,
gfp_t gfp_mask);
static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq)
{
@ -2601,7 +2602,7 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
cfq_clear_cfqq_prio_changed(cfqq);
}
static void changed_ioprio(struct cfq_io_cq *cic)
static void changed_ioprio(struct cfq_io_cq *cic, struct bio *bio)
{
struct cfq_data *cfqd = cic_to_cfqd(cic);
struct cfq_queue *cfqq;
@ -2613,7 +2614,7 @@ static void changed_ioprio(struct cfq_io_cq *cic)
if (cfqq) {
struct cfq_queue *new_cfqq;
new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic->icq.ioc,
GFP_ATOMIC);
bio, GFP_ATOMIC);
if (new_cfqq) {
cic->cfqq[BLK_RW_ASYNC] = new_cfqq;
cfq_put_queue(cfqq);
@ -2671,7 +2672,7 @@ static void changed_cgroup(struct cfq_io_cq *cic)
static struct cfq_queue *
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,
struct io_context *ioc, gfp_t gfp_mask)
struct io_context *ioc, struct bio *bio, gfp_t gfp_mask)
{
struct blkio_cgroup *blkcg;
struct cfq_queue *cfqq, *new_cfqq = NULL;
@ -2681,7 +2682,7 @@ cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,
retry:
rcu_read_lock();
blkcg = task_blkio_cgroup(current);
blkcg = bio_blkio_cgroup(bio);
cfqg = cfq_lookup_create_cfqg(cfqd, blkcg);
@ -2746,7 +2747,7 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio)
static struct cfq_queue *
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
gfp_t gfp_mask)
struct bio *bio, gfp_t gfp_mask)
{
const int ioprio = task_ioprio(ioc);
const int ioprio_class = task_ioprio_class(ioc);
@ -2759,7 +2760,7 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
}
if (!cfqq)
cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, gfp_mask);
cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, bio, gfp_mask);
/*
* pin the queue now that it's allocated, scheduler exit will prune it
@ -3316,7 +3317,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
/* handle changed notifications */
changed = icq_get_changed(&cic->icq);
if (unlikely(changed & ICQ_IOPRIO_CHANGED))
changed_ioprio(cic);
changed_ioprio(cic, bio);
#ifdef CONFIG_CFQ_GROUP_IOSCHED
if (unlikely(changed & ICQ_CGROUP_CHANGED))
changed_cgroup(cic);
@ -3325,7 +3326,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
new_queue:
cfqq = cic_to_cfqq(cic, is_sync);
if (!cfqq || cfqq == &cfqd->oom_cfqq) {
cfqq = cfq_get_queue(cfqd, is_sync, cic->icq.ioc, gfp_mask);
cfqq = cfq_get_queue(cfqd, is_sync, cic->icq.ioc, bio, gfp_mask);
cic_set_cfqq(cic, cfqq, is_sync);
} else {
/*