From: Bart Van Assche <bvanassche@acm.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org,
Dongli Zhang <dongli.zhang@oracle.com>,
James Smart <james.smart@broadcom.com>,
Bart Van Assche <bart.vanassche@wdc.com>,
linux-scsi@vger.kernel.org,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Christoph Hellwig <hch@lst.de>,
"James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
jianchao wang <jianchao.w.wang@oracle.com>
Subject: Re: [PATCH V3 1/6] blk-mq: grab .q_usage_counter when queuing request from plug code path
Date: Wed, 03 Apr 2019 14:22:54 -0700 [thread overview]
Message-ID: <1554326574.118779.235.camel@acm.org> (raw)
In-Reply-To: <20190403162726.GB22741@ming.t460p>
On Thu, 2019-04-04 at 00:27 +0800, Ming Lei wrote:
> blk_mq_flush_plug_list():
> blk_mq_sched_insert_requests()
> insert requests to sw queue or scheduler queue
> blk_mq_run_hw_queue
>
> Because of concurrent run queue, all requests inserted above may be completed
> before calling the above blk_mq_run_hw_queue. Then queue can be freed
> during the above blk_mq_run_hw_queue().
Thanks for the clarification. That makes sense to me.
Bart.
next prev parent reply other threads:[~2019-04-03 21:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 10:26 [PATCH V3 0/6] blk-mq: fix races related with freeing queue Ming Lei
2019-04-03 10:26 ` [PATCH V3 1/6] blk-mq: grab .q_usage_counter when queuing request from plug code path Ming Lei
2019-04-03 15:21 ` Bart Van Assche
2019-04-03 16:27 ` Ming Lei
2019-04-03 21:22 ` Bart Van Assche [this message]
2019-04-04 6:57 ` Ming Lei
2019-04-03 10:26 ` [PATCH V3 2/6] blk-mq: move cancel of requeue_work into blk_mq_release Ming Lei
2019-04-03 16:19 ` Bart Van Assche
2019-04-03 10:26 ` [PATCH V3 3/6] blk-mq: free hw queue's resource in hctx's release handler Ming Lei
2019-04-03 16:26 ` Bart Van Assche
2019-04-04 6:40 ` Ming Lei
2019-04-04 7:42 ` Ming Lei
2019-04-03 10:26 ` [PATCH V3 4/6] blk-mq: move cancel of hctx->run_work into blk_mq_hw_sysfs_release Ming Lei
2019-04-03 16:21 ` Bart Van Assche
2019-04-03 10:26 ` [PATCH V3 5/6] block: don't drain in-progress dispatch in blk_cleanup_queue() Ming Lei
2019-04-03 15:25 ` Bart Van Assche
2019-04-03 10:26 ` [PATCH V3 6/6] SCSI: don't hold device refcount in IO path Ming Lei
2019-04-03 16:24 ` Bart Van Assche
2019-04-04 6:47 ` Ming Lei
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