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blk-throttle: don't take carryover for prioritized processing of metadata 

Commit 29390bb566 ("blk-throttle: support prioritized processing of metadata")
takes bytes/ios carryover for prioritized processing of metadata. Turns out
we can support it by charging it directly without trimming slice, and the
result is same with carryover.

Cc: Tejun Heo <tj@kernel.org>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20250305043123.3938491-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1188/head
Ming Lei 2025-03-05 12:31:20 +08:00 committed by Jens Axboe
parent 483a393e7e
commit a9fc8868b3
1 changed files with 5 additions and 10 deletions
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15
block/blk-throttle.c
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@ -1620,13 +1620,6 @@ static bool tg_within_limit(struct throtl_grp *tg, struct bio *bio, bool rw)
return tg_may_dispatch(tg, bio, NULL); return tg_may_dispatch(tg, bio, NULL);
} }
static void tg_dispatch_in_debt(struct throtl_grp *tg, struct bio *bio, bool rw)
{
if (!bio_flagged(bio, BIO_BPS_THROTTLED))
tg->carryover_bytes[rw] -= throtl_bio_data_size(bio);
tg->carryover_ios[rw]--;
}
bool __blk_throtl_bio(struct bio *bio) bool __blk_throtl_bio(struct bio *bio)
{ {
struct request_queue *q = bdev_get_queue(bio->bi_bdev); struct request_queue *q = bdev_get_queue(bio->bi_bdev);
@ -1663,10 +1656,12 @@ bool __blk_throtl_bio(struct bio *bio)
/* /*
* IOs which may cause priority inversions are * IOs which may cause priority inversions are
* dispatched directly, even if they're over limit. * dispatched directly, even if they're over limit.
* Debts are handled by carryover_bytes/ios while *
* calculating wait time. * Charge and dispatch directly, and our throttle
* control algorithm is adaptive, and extra IO bytes
* will be throttled for paying the debt
*/ */
tg_dispatch_in_debt(tg, bio, rw); throtl_charge_bio(tg, bio);
} else { } else {
/* if above limits, break to queue */ /* if above limits, break to queue */
break; break;