linux-kernel - Re: [RPC][PATCH 2.6.20-rc5] limit total vfs page cache

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Message-ID: <Pine.LNX.4.64.0701191059020.15546@schroedinger.engr.sgi.com>
Date:	Fri, 19 Jan 2007 11:01:57 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
cc:	Aubrey Li <aubreylee@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	Robin Getz <rgetz@...ckfin.uclinux.org>
Subject: Re: [RPC][PATCH 2.6.20-rc5] limit total vfs page cache

On Sat, 20 Jan 2007, Vaidyanathan Srinivasan wrote:

> >> However when the zone reclaimer starts to reclaim pages, it will
> >> remove all cold pages and not specifically pagecache pages.  This
> >> may affect performance of applications.

The reclaimer is passed a control structure that can be used to disable
write to swap (if that is the concern).

> I am open to suggestions on reclaim logic.  My view is that we need
> to selectively reclaim pagecache pages and not just call the
> traditional reclaimer to freeup arbitrary type of pages.

The traditional reclaim works fine if told what to do. Introducing another 
LRU list to do reclaim is a significant change to the VM, creates lots of
overhead etc.
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