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blk-throttle: cleanup tg_update_disptime() 

tg_update_disptime() only need to adjust postion for 'tg' in
'parent_sq', there is no need to call throtl_enqueue/dequeue_tg(),
since they will set/clear flag THROTL_TG_PENDING and increase/decrease
nr_pending, which is useless. By the way, clear the flag/decrease
nr_pending while there are still throttled bios is not good for debugging.

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/20220827101637.1775111-4-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2022-08-27 18:16:37 +08:00 committed by Jens Axboe
parent 8c25ed0cb9
commit c013710e1a
1 changed files with 7 additions and 4 deletions
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11
block/blk-throttle.c
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@ -520,7 +520,6 @@ static void throtl_rb_erase(struct rb_node *n,
{
rb_erase_cached(n, &parent_sq->pending_tree);
RB_CLEAR_NODE(n);
--parent_sq->nr_pending;
}
static void update_min_dispatch_time(struct throtl_service_queue *parent_sq)
@ -572,7 +571,11 @@ static void throtl_enqueue_tg(struct throtl_grp *tg)
static void throtl_dequeue_tg(struct throtl_grp *tg)
{
if (tg->flags & THROTL_TG_PENDING) {
throtl_rb_erase(&tg->rb_node, tg->service_queue.parent_sq);
struct throtl_service_queue *parent_sq =
tg->service_queue.parent_sq;
throtl_rb_erase(&tg->rb_node, parent_sq);
--parent_sq->nr_pending;
tg->flags &= ~THROTL_TG_PENDING;
}
}
@ -1034,9 +1037,9 @@ static void tg_update_disptime(struct throtl_grp *tg)
disptime = jiffies + min_wait;
/* Update dispatch time */
throtl_dequeue_tg(tg);
throtl_rb_erase(&tg->rb_node, tg->service_queue.parent_sq);
tg->disptime = disptime;
throtl_enqueue_tg(tg);
tg_service_queue_add(tg);
/* see throtl_add_bio_tg() */
tg->flags &= ~THROTL_TG_WAS_EMPTY;