linux-kernel - RE: [PATCH/RFC] NOMMU: drop page cache whenever any alloc fails due to low memory

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Message-ID: <0F1B54C89D5F954D8535DB252AF412FA045E8C0F@chinexm1.ad.analog.com>
Date:	Wed, 15 Jul 2009 11:29:10 +0800
From:	"Zhang, Sonic" <Sonic.Zhang@...log.com>
To:	"Peter Zijlstra" <peterz@...radead.org>,
	"Mike Frysinger" <vapier@...too.org>
CC:	<linux-kernel@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	"David Howells" <dhowells@...hat.com>
Subject: RE: [PATCH/RFC] NOMMU: drop page cache whenever any alloc fails due to low memory

The reclaim is not that aggressive.

Sonic 

-----Original Message-----
From: Peter Zijlstra [mailto:peterz@...radead.org] 
Sent: Tuesday, July 14, 2009 10:31 PM
To: Mike Frysinger
Cc: linux-kernel@...r.kernel.org;
uclinux-dist-devel@...ckfin.uclinux.org; Zhang, Sonic; David Howells
Subject: Re: [PATCH/RFC] NOMMU: drop page cache whenever any alloc fails
due to low memory

On Tue, 2009-07-14 at 10:22 -0400, Mike Frysinger wrote:
> From: Sonic Zhang <sonic.zhang@...log.com>
> 
> Since no-mmu systems tend to be memory constrained, we want to drop 
> all of the page cache whenever memory gets low.  The only other option

> is to invoke the oom killer, and clearly that's not ideal.

Uhm,.. normally reclaim will already try to drop pagecache.
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