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

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Message-ID: <45B7561C.9000102@yahoo.com.au>
Date:	Wed, 24 Jan 2007 23:50:36 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Christoph Lameter <clameter@....com>,
	Aubrey Li <aubreylee@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Robin Getz <rgetz@...ckfin.uclinux.org>,
	"Henn, erich, Michael" <Michael.Hennerich@...log.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Limit the size of the pagecache

Peter Zijlstra wrote:
> On Tue, 2007-01-23 at 16:49 -0800, Christoph Lameter wrote:

>>2. Insure rapid turnaround of pages in the cache.

[...]

> The  only maybe valid point would be 2, and I'd like to see if we can't
> solve that differently - a better use-once logic comes to mind.

There must be something I'm missing with that point. The faster
the turnaround of pagecache pages, the *less* efficiently the
pagecache is working (assuming a rapid turnaround means a high
rate of pages brought into, then reclaimed from pagecache).

I can't argue that a smaller pagecache will be subject to a
higher turnaround given the same workload, but I don't know why
that would be a good thing.

-- 
SUSE Labs, Novell Inc.
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