Re: [PATCH v3 3/4] block: loop: use kthread_work

From: Ming Lei
Date: Tue May 12 2015 - 04:55:46 EST

On Tue, May 12, 2015 at 3:25 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> 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.

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