Re: [PATCH] blk-mq: clear active_queues before clearing BLK_MQ_F_TAG_QUEUE_SHARED

[Jens Axboe]

On 7/31/21 12:21 AM, Yu Kuai wrote:
> We run a test that delete and recover devcies frequently(two devices on
> the same host), and we found that 'active_queues' is super big after a
> period of time.
> 
> If device a and device b share a tag set, and a is deleted, then
> blk_mq_exit_queue() will clear BLK_MQ_F_TAG_QUEUE_SHARED because there
> is only one queue that are using the tag set. However, if b is still
> active, the active_queues of b might never be cleared even if b is
> deleted.
> 
> Thus clear active_queues before BLK_MQ_F_TAG_QUEUE_SHARED is cleared.

Applied, thanks.

-- 
Jens Axboe