linux-kernel - Re: [PATCH 0/6] blk-mq: initialize pdu of flush req explicitly

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Message-ID: <540DFD8D.2020804@kernel.dk>
Date:	Mon, 08 Sep 2014 13:03:41 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Ming Lei <ming.lei@...onical.com>, Christoph Hellwig <hch@....de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 0/6] blk-mq: initialize pdu of flush req explicitly

On 09/08/2014 10:55 AM, Ming Lei wrote:
> On Mon, Sep 8, 2014 at 2:49 AM, Christoph Hellwig <hch@....de> wrote:
>> This works fine for me, although I still don't really like it very much.
>>
>> If you really want to go down the path of major surgery in this area we
>> should probably allocate a flush request per hw_ctx, and initialize it
>> using the normal init/exit functions.  If we want to have proper multiqueue
>> performance on devices needing flushes we'll need something like that anyway.
> 
> Yes, that should be the final solution for the problem, and looks the whole
> flush machinery need to move into hctx, I will try to figure out one patch to
> do that.

I had not thought of that, but seems like a great way to clean this up a
lot. It just never felt like the right thing to do.

-- 
Jens Axboe

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