linux-kernel - Re: [PATCH 0/3] make mapped executable pages the first class citizen

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Message-Id: <20090624114055.225D.A69D9226@jp.fujitsu.com>
Date:	Wed, 24 Jun 2009 11:43:21 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH 0/3] make mapped executable pages the first class citizen

> On Tue, Jun 23, 2009 at 10:43:57PM +0800, David Howells wrote:
> > Wu Fengguang <fengguang.wu@...el.com> wrote:
> > 
> > > David, could you try running this when it occurred again?
> > > 
> > >         make Documentation/vm/page-types
> > >         Documentation/vm/page-types --raw  # run as root
> > 
> > Okay.  I managed to catch it between the first and second OOMs, and ran the
> > command you asked for.
> 
> Thank you!
> 
> > 0x0000000000000000	    142261      555  ________________________________	
> > 0x0000000000000400	      6797       26  __________B_____________________	buddy
> 
> The buddy+free numbers are pretty high. 26MB PG_buddy pages means much
> more actual free pages. So I bet the 555MB no-flag pages are mostly free pages.

You mean our VM can make OOM although it have 600MB free pages?



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