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blk-wbt: Optimize wbt_done() for non-throttled writes

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In the current implementation, the sync_cookie and last_cookie members of
struct rq_wb are used only by read requests and not by non-throttled write
requests. Based on this, we can optimize wbt_done() by removing one if
condition check for non-throttled write requests.

Signed-off-by: Tang Yizhou <yizhou.tang@shopee.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20250727173959.160835-2-yizhou.tang@shopee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tang Yizhou 2025-07-28 01:39:57 +08:00 committed by Jens Axboe
parent 343dc5423b
commit d8b96a7962
1 changed files with 6 additions and 5 deletions
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11
block/blk-wbt.c
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@ -248,13 +248,14 @@ static void wbt_done(struct rq_qos *rqos, struct request *rq)
struct rq_wb *rwb = RQWB(rqos);
if (!wbt_is_tracked(rq)) {
if (rwb->sync_cookie == rq) {
rwb->sync_issue = 0;
rwb->sync_cookie = NULL;
}
if (wbt_is_read(rq)) {
if (rwb->sync_cookie == rq) {
rwb->sync_issue = 0;
rwb->sync_cookie = NULL;
}
if (wbt_is_read(rq))
wb_timestamp(rwb, &rwb->last_comp);
}
} else {
WARN_ON_ONCE(rq == rwb->sync_cookie);
__wbt_done(rqos, wbt_flags(rq));