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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090627115306.GA1741@cmpxchg.org>
Date:	Sat, 27 Jun 2009 13:53:07 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.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 Wed, Jun 24, 2009 at 11:43:21AM +0900, KOSAKI Motohiro wrote:
> > 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?

No, it has 600MB free pages after an OOM - which only means that the
OOM killer did a good job ;-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/