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Message-ID: <20090428072619.GA29747@eskimo.com>
Date: Tue, 28 Apr 2009 00:26:19 -0700
From: Elladan <elladan@...imo.com>
To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Elladan <elladan@...imo.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 My documentation was out of date.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.
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