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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>
This commit is contained in:
Yu Kuai 2022-09-21 17:53:09 +08:00 committed by Jens Axboe
parent 8549674990
commit 81c7a63abc
2 changed files with 28 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
block/blk-throttle.c
View File

@ -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)

22
block/blk-throttle.h
View File

@ -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);
if (!tg->has_rules[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 (!blk_should_throtl(bio))
return false;
return __blk_throtl_bio(bio);