linux-kernel - Re: [PATCH 8/8] blk-mq: support per-distpatch

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Message-ID: <20140910190247.GA28821@infradead.org>
Date:	Wed, 10 Sep 2014 12:02:47 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 8/8] blk-mq: support per-distpatch_queue flush machinery

On Wed, Sep 10, 2014 at 09:40:11AM +0800, Ming Lei wrote:
> I am wondering we can do that because lifetime is totally different
> between flush requests and tag_set requests which are initialized
> before request queue is created.

We shouldn't do it in the tag sets, but where we allocate and free
each hctx: blk_mq_init_queue and blk_mq_free_hw_queues.

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