linux-kernel - Re: [PATCH V3 2/8] Make TestSetPageDirty and dirty page accounting in one func

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Message-ID: <20130105104538.GB24698@dhcp22.suse.cz>
Date:	Sat, 5 Jan 2013 11:45:38 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Sha Zhengju <handai.szj@...il.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	dchinner@...hat.com, akpm@...ux-foundation.org,
	kamezawa.hiroyu@...fujitsu.com, gthelen@...gle.com,
	fengguang.wu@...el.com, glommer@...allels.com,
	Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH V3 2/8] Make TestSetPageDirty and dirty page accounting
 in one func

On Sat 05-01-13 10:49:00, Sha Zhengju wrote:
[...]
> >> Here is some test numbers that before/after this patch:
> >> Test steps(Mem-4g, ext4):
> >> drop_cache; sync
> >> fio (ioengine=sync/write/buffered/bs=4k/size=1g/numjobs=2/group_reporting/thread)
> >
> > Could also add some rationale why you think this test is relevant?
> >
> 
> The test is aiming at finding the impact of performance due to lock
> contention by writing parallel
> to the same file. I'll add the reason next version too.

Please make sure to describe which locks are exercised during that test
and how much.

Thanks
[...]
-- 
Michal Hocko
SUSE Labs
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