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

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Message-ID: <20090520144731.GB4753@basil.nowhere.org>
Date:	Wed, 20 May 2009 16:47:31 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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

> > 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.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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