linux-kernel - Re: Swappiness vs. mmap() and interactive response

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Message-Id: <20090428164050.EBD2.A69D9226@jp.fujitsu.com>
Date:	Tue, 28 Apr 2009 16:44:29 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Elladan <elladan@...imo.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>
Subject: Re: Swappiness vs. mmap() and interactive response

> On Tue, Apr 28, 2009 at 03:52:29PM +0900, KOSAKI Motohiro wrote:
> > Hi
> > 
> > > 3. cache limitation of memcgroup solve this problem?
> > > 
> > > I was unable to get this to work -- do you have some documentation handy?
> > 
> > Do you have kernel source tarball?
> > Documentation/cgroups/memory.txt explain usage kindly.
> 
> Thank you.  My documentation was out of date.
> 
> I created a cgroup with limited memory and placed a copy command in it, and the
> latency problem seems to essentially go away.  However, I'm also a bit
> suspicious that my test might have become invalid, since my IO performance
> seems to have dropped somewhat too.
> 
> So, am I right in concluding that this more or less implicates bad page
> replacement as the culprit?  After I dropped vm caches and let my working set
> re-form, the memory cgroup seems to be effective at keeping a large pool of
> memory free from file pressure.

Hmm..
it seems your result mean bad page replacement occur. but actually
I hevn't seen such result on my environment.

Hmm, I think I need to make reproduce environmet to your trouble.

Thanks.



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