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

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Date:	Sat, 20 Jan 2007 00:05:01 +0800
From:	"Aubrey Li" <aubreylee@...il.com>
To:	"Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>
Cc:	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 1/19/07, Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> wrote:
>
>
> Hi Aubrey,
>
> The idea of creating separate flag for pagecache in page_alloc is
> interesting.  The good part is that you flag watermark low and the
> zone reclaimer will do the rest of the job.
>
> 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.
>
> One possible solution to this reclaim is to use scan control fields
> and ask the shrink_page_list() and shrink_active_list() routines to
> target only pagecache pages.  Pagecache pages are not mapped and
> they are easy to find on the LRU list.
>
> Please review my patch at http://lkml.org/lkml/2007/01/17/96
>

So you mean the existing reclaimer has the same issue, doesn't it?
In your and Roy's patch, balance_pagecache() routine is called on file
backed access.
So you still want to add this checking? or change the current
reclaimer completely?

-Aubrey
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