linux-kernel - Re: [ckrm-tech] RFC: Memory Controller

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Message-Id: <20061031014243.1153655b.akpm@osdl.org>
Date:	Tue, 31 Oct 2006 01:42:43 -0800
From:	Andrew Morton <akpm@...l.org>
To:	balbir@...ibm.com
Cc:	Pavel Emelianov <xemul@...nvz.org>, vatsa@...ibm.com,
	dev@...nvz.org, sekharan@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, haveblue@...ibm.com,
	linux-kernel@...r.kernel.org, pj@....com, matthltc@...ibm.com,
	dipankar@...ibm.com, rohitseth@...gle.com, menage@...gle.com,
	linux-mm@...ck.org, Vaidyanathan S <svaidy@...ibm.com>
Subject: Re: [ckrm-tech] RFC: Memory Controller

On Tue, 31 Oct 2006 14:49:12 +0530
Balbir Singh <balbir@...ibm.com> wrote:

> The idea behind limiting the page cache is this
> 
> 1. Lets say one container fills up the page cache.
> 2. The other containers will not be able to allocate memory (even
> though they are within their limits) without the overhead of having
> to flush the page cache and freeing up occupied cache. The kernel
> will have to pageout() the dirty pages in the page cache.

There's a vast difference between clean pagecache and dirty pagecache in this
context.  It is terribly imprecise to use the term "pagecache".  And it would be
a poor implementation which failed to distinguish between clean pagecache and
dirty pagecache.

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