linux-kernel - Re: [PATCH 04/10] block: initial patch for on-stack per-task plugging

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Date:	Tue, 22 Mar 2011 08:36:44 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"jmoyer@...hat.com" <jmoyer@...hat.com>
Subject: Re: [PATCH 04/10] block: initial patch for on-stack per-task  plugging

On 2011-03-22 01:32, Shaohua Li wrote:
> On Mon, 2011-03-21 at 17:20 +0800, Jens Axboe wrote:
>> On 2011-03-21 07:52, Shaohua Li wrote:
>>>> Gave it a quick test spin, as suspected it had a few issues. This one
>>>> seems to work. Can you toss it through that workload and see if it fares
>>>> better?
>>> yes, this fully restores the regression I saw. But I have accounting
>>> issue:
>>
>> Great!
>>
>>> 1. The merged request is already accounted when it's added into plug
>>> list
>>
>> Good catch. I've updated the patch and merged it now, integrating this
>> accounting fix.
>>
>>> 2. drive_stat_acct() is called without any protection in
>>> __make_request(). So there is race for in_flight accounting. The race
>>> exists after stack plug is added, so not because of this issue.
>>> Below is the extra patch I need to do the test.
>>
>> Looks fine. Can I add your signed-off-by to this patch? I'll merge it as
>> a separate fix.
> Sure.
> Signed-off-by: Shaohua Li<shaohua.li@...el.com>

Thanks, patch has been added now.

-- 
Jens Axboe

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