linux-kernel - Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen

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Date:	Wed, 20 May 2009 22:56:08 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Elladan <elladan@...imo.com>, Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first
	class citizen

On Wed, May 20, 2009 at 10:47:31PM +0800, Andi Kleen wrote:
> > > One scenario that might be useful to test is what happens when some
> > > very large processes, all mapped and executable exceed memory and
> > 
> > Good idea. Too bad I may have to install some bloated desktop in order
> > to test this out ;) I guess the pgmajfault+pswpin numbers can serve as
> > negative scores in that case?
> 
> I would just generate a large C program with a script and compile
> and run that. The program can be very dumb (e.g. only run
> a gigantic loop), it just needs to be large.
> 
> Just don't compile it with optimization, that can be quite slow.
> 
> And use multiple functions, otherwise gcc might exceed your memory.


Hehe, an arbitrary C program may not be persuasive..but I do have some
bloated binaries at hand :-)

-rwsr-sr-x 1 root wfg   36M 2009-04-22 17:21 Xorg
lrwxrwxrwx 1 wfg  wfg     4 2009-04-22 17:21 X -> Xorg
-rwxr-xr-x 1 wfg  wfg   39M 2009-04-22 17:21 Xvfb
-rwxr-xr-x 1 wfg  wfg   35M 2009-04-22 17:21 Xnest
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