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

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Date:	Mon, 21 Mar 2011 10:20:28 +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 2011-03-21 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.

-- 
Jens Axboe

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