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blkcg: introduce common blkg association logic

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There are 3 ways blkg association can happen: association with the
current css, with the page css (swap), or from the wbc css (writeback).

This patch handles how association is done for the first case where we
are associating bsaed on the current css. If there is already a blkg
associated, the css will be reused and association will be redone as the
request_queue may have changed.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dennis Zhou
2018-12-05 12:10:29 -05:00
committed by Jens Axboe
parent beea9da07d
commit 2268c0feb0
4 changed files with 62 additions and 21 deletions
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6
block/blk-throttle.c
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@@ -2115,10 +2115,10 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td)
}
#endif
static void blk_throtl_assoc_bio(struct throtl_grp *tg, struct bio *bio)
static void blk_throtl_assoc_bio(struct bio *bio)
{
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
bio_associate_blkg(bio, tg_to_blkg(tg));
bio_associate_blkg(bio);
bio_issue_init(&bio->bi_issue, bio_sectors(bio));
#endif
}
@@ -2143,7 +2143,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
throtl_update_latency_buckets(td);
blk_throtl_assoc_bio(tg, bio);
blk_throtl_assoc_bio(bio);
blk_throtl_update_idletime(tg);
sq = &tg->service_queue;