linux-kernel - Re: [RFC] Limit the size of the pagecache

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Date:	Wed, 24 Jan 2007 22:22:43 +0800
From:	"Aubrey Li" <aubreylee@...il.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Robin Getz" <rgetz@...ckfin.uclinux.org>,
	"Frysinger, Michael" <Michael.Frysinger@...log.com>,
	"Bryan Wu" <cooloney.lkml@...il.com>,
	"Hennerich, Michael" <Michael.Hennerich@...log.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Limit the size of the pagecache

On 1/24/07, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Tue, 2007-01-23 at 16:49 -0800, Christoph Lameter wrote:
> > This is a patch using some of Aubrey's work plugging it in what is IMHO
> > the right way. Feel free to improve on it. I have gotten repeatedly
> > requests to be able to limit the pagecache. With the revised VM statistics
> > this is now actually possile. I'd like to know more about possible uses of
> > such a feature.
> >
> >
> >
> >
> > It may be useful to limit the size of the page cache for various reasons
> > such as
> >
> > 1. Insure that anonymous pages that may contain performance
> >    critical data is never subject to swap.
>
> This is what we have mlock for, no?
>
> > 2. Insure rapid turnaround of pages in the cache.
>
> This sounds like we either need more fadvise hints and/or understand why
> the VM doesn't behave properly.
>
> > 3. Reserve memory for other uses? (Aubrey?)
>
> He wants to make a nommu system act like a mmu system; this will just
> never ever work.

Nope. Actually my nommu system works great with some of patches made by us.
What let you think this will never work?

>Memory fragmentation is a real issue not some gimmick
> thought up by the hardware folks to sell these mmu chips.
>
I totally disagree. Memory fragmentations is the issue not only on
nommu, it's also on mmu chips. That's not the reason mmu chips can be
sold.

-Aubrey
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