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blk-throttle: calling throtl_dequeue/enqueue_tg in pairs

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It's a little weird to call throtl_dequeue_tg() unconditionally in
throtl_select_dispatch(), since it will be called in tg_update_disptime()
again if some bio is still throttled. Thus call it later if there are no
throttled bio. There are no functional changes.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220827101637.1775111-3-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2022-08-27 18:16:36 +08:00 committed by Jens Axboe
parent 7e9c5c54d4
commit 8c25ed0cb9
1 changed files with 2 additions and 2 deletions
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4
block/blk-throttle.c
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@ -1146,13 +1146,13 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
if (time_before(jiffies, tg->disptime))
break;
throtl_dequeue_tg(tg);
nr_disp += throtl_dispatch_tg(tg);
sq = &tg->service_queue;
if (sq->nr_queued[READ] || sq->nr_queued[WRITE])
tg_update_disptime(tg);
else
throtl_dequeue_tg(tg);
if (nr_disp >= THROTL_QUANTUM)
break;