Re: [PATCH 5/8] blk-mq: add tagset quiesce interface

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On 10/20/22 03:56, Christoph Hellwig wrote:
From: Chao Leng <lengchao@xxxxxxxxxx>

Drivers that have shared tagsets may need to quiesce potentially a lot
of request queues that all share a single tagset (e.g. nvme). Add an
interface to quiesce all the queues on a given tagset. This interface is
useful because it can speedup the quiesce by doing it in parallel.

Because some queues should not need to be quiesced(e.g. nvme connect_q)

should not need -> do not have

when quiesce the tagset. So introduce QUEUE_FLAG_SKIP_TAGSET_QUIESCE to

quiesce -> quiescing

. So -> ,

tagset quiesce interface to skip the queue.

Hi Christoph,

Are there any drivers that may call blk_mq_quiesce_tagset() concurrently from two different threads? blk_mq_quiesce_queue() supports this but blk_mq_quiesce_tagset() cannot support this because of the mechanism used to mark request queues that should be skipped (queue flag).

Thanks,

Bart.



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