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block: always attach cgroup info into bio

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blkcg_bio_issue_check() already gets blkcg for a BIO.
bio_associate_blkcg() uses a percpu refcounter, so it's a very cheap
operation. There is no point we don't attach the cgroup info into bio at
blkcg_bio_issue_check. This also makes blktrace outputs correct cgroup
info.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li
2017-07-12 11:49:54 -07:00
committed by Jens Axboe
parent ca1136c99b
commit 007cc56b7e
2 changed files with 4 additions and 6 deletions
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3
include/linux/blk-cgroup.h
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@@ -691,6 +691,9 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
rcu_read_lock();
blkcg = bio_blkcg(bio);
/* associate blkcg if bio hasn't attached one */
bio_associate_blkcg(bio, &blkcg->css);
blkg = blkg_lookup(blkcg, q);
if (unlikely(!blkg)) {
spin_lock_irq(q->queue_lock);