From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Elladan <elladan@eskimo.com>
Subject: Re: Swappiness vs. mmap() and interactive response
Cc: kosaki.motohiro@jp.fujitsu.com, linux-kernel@vger.kernel.org,
       linux-mm <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>
In-Reply-To: <20090428072619.GA29747@eskimo.com>
References: <20090428154835.EBC9.A69D9226@jp.fujitsu.com> <20090428072619.GA29747@eskimo.com>
Message-Id: <20090428164050.EBD2.A69D9226@jp.fujitsu.com>
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Date: Tue, 28 Apr 2009 16:44:29 +0900 (JST)
Sender: linux-kernel-owner@vger.kernel.org
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> 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  My documentation was out of date.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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