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

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Message-ID: <1300753935.2337.149.camel@sli10-conroe>
Date:	Tue, 22 Mar 2011 08:32:15 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Jens Axboe <jaxboe@...ionio.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 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>

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