linux-kernel - Re: [PATCH v3 3/4] block: loop: use kthread

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Message-ID: <CACVXFVN2njbRR1y6eHZDHwTzsZVo+gi7mJwcZ-eqX=ffdc8-Sw@mail.gmail.com>
Date:	Tue, 12 May 2015 16:55:36 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH v3 3/4] block: loop: use kthread_work

On Tue, May 12, 2015 at 3:25 PM, Christoph Hellwig <hch@...radead.org> wrote:
> On Mon, May 11, 2015 at 09:12:56PM +0800, Ming Lei wrote:
>> For non-AIO case, single thread has been used for long long time,
>> and it was just converted to work in v4.0, which has caused performance
>> regression for fedora live booting already. In discussion[1], even though
>> submitting I/O via work concurrently can improve random IO throughput,
>> meantime it may hurt sequential IO performance, so maybe better to restore
>> to single thread behaviour.
>
> Then justify the change based on the non-aio use case and document that
> in the changelog.

OK, will add that in v4.

Thanks,
Ming
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