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blkcg: delete redundant get/put operations for queue

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When calling blkcg_schedule_throttle(), for the same queue,
redundant get/put operations can be removed.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chunguang Xu
2021-01-25 13:05:28 +08:00
committed by Jens Axboe
parent 2c2b9fd6b4
commit 49d1822bc0
1 changed files with 8 additions and 5 deletions
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13
block/blk-cgroup.c
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@@ -1757,12 +1757,15 @@ void blkcg_schedule_throttle(struct request_queue *q, bool use_memdelay)
if (unlikely(current->flags & PF_KTHREAD))
return;
if (!blk_get_queue(q))
return;
if (current->throttle_queue != q) {
if (!blk_get_queue(q))
return;
if (current->throttle_queue)
blk_put_queue(current->throttle_queue);
current->throttle_queue = q;
}
if (current->throttle_queue)
blk_put_queue(current->throttle_queue);
current->throttle_queue = q;
if (use_memdelay)
current->use_memdelay = use_memdelay;
set_notify_resume(current);