diff options
| author | Yu Kuai <yukuai3@huawei.com> | 2022-09-21 17:53:09 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-24 08:59:43 -0600 |
| commit | 81c7a63abc7c0be572b4f853e913ce93a34f6e1b (patch) | |
| tree | 3358a474ca304876e431085299e980128c58116e | |
| parent | 85496749904016f36b69332f73a1cf3ecfee828f (diff) | |
| download | linux-81c7a63abc7c0be572b4f853e913ce93a34f6e1b.tar.gz | |
blk-throttle: improve bypassing bios checkings
"tg->has_rules" is extended to "tg->has_rules_iops/bps", thus bios that don't need to be throttled can be checked accurately. With this patch, bio will be throttled if: 1) Bio is read/write, and corresponding read/write iops limit exist. 2) If corresponding doesn't exist, corresponding bps limit exist and bio is not throttled before. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20220921095309.1481289-3-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-throttle.c | 13 | ||||
| -rw-r--r-- | block/blk-throttle.h | 22 |
2 files changed, 28 insertions, 7 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index a062539d84d0..78316955e30f 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -421,11 +421,16 @@ static void tg_update_has_rules(struct throtl_grp *tg) struct throtl_data *td = tg->td; int rw; - for (rw = READ; rw <= WRITE; rw++) - tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) || + for (rw = READ; rw <= WRITE; rw++) { + tg->has_rules_iops[rw] = + (parent_tg && parent_tg->has_rules_iops[rw]) || (td->limit_valid[td->limit_index] && - (tg_bps_limit(tg, rw) != U64_MAX || - tg_iops_limit(tg, rw) != UINT_MAX)); + tg_iops_limit(tg, rw) != UINT_MAX); + tg->has_rules_bps[rw] = + (parent_tg && parent_tg->has_rules_bps[rw]) || + (td->limit_valid[td->limit_index] && + (tg_bps_limit(tg, rw) != U64_MAX)); + } } static void throtl_pd_online(struct blkg_policy_data *pd) diff --git a/block/blk-throttle.h b/block/blk-throttle.h index 3994b89dfa11..69f00012d616 100644 --- a/block/blk-throttle.h +++ b/block/blk-throttle.h @@ -98,7 +98,8 @@ struct throtl_grp { unsigned int flags; /* are there any throtl rules between this group and td? */ - bool has_rules[2]; + bool has_rules_bps[2]; + bool has_rules_iops[2]; /* internally used bytes per second rate limits */ uint64_t bps[2][LIMIT_CNT]; @@ -178,11 +179,26 @@ void blk_throtl_exit(struct request_queue *q); void blk_throtl_register_queue(struct request_queue *q); bool __blk_throtl_bio(struct bio *bio); void blk_throtl_cancel_bios(struct request_queue *q); -static inline bool blk_throtl_bio(struct bio *bio) + +static inline bool blk_should_throtl(struct bio *bio) { struct throtl_grp *tg = blkg_to_tg(bio->bi_blkg); + int rw = bio_data_dir(bio); + + /* iops limit is always counted */ + if (tg->has_rules_iops[rw]) + return true; + + if (tg->has_rules_bps[rw] && !bio_flagged(bio, BIO_BPS_THROTTLED)) + return true; + + return false; +} + +static inline bool blk_throtl_bio(struct bio *bio) +{ - if (!tg->has_rules[bio_data_dir(bio)]) + if (!blk_should_throtl(bio)) return false; return __blk_throtl_bio(bio); |