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

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Message-ID: <4A02F8ED.3090008@redhat.com>
Date:	Thu, 07 May 2009 11:06:21 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Elladan <elladan@...imo.com>, Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class
 citizen

Christoph Lameter wrote:
> On Thu, 7 May 2009, Peter Zijlstra wrote:
>
>   
>> It re-instates the young bit for PROT_EXEC pages, so that they will only
>> be paged when they are really cold, or there is severe pressure.
>>     
>
> But they are rescanned until then. Really cold means what exactly? I do a
> back up of a few hundred gigabytes and do not use firefox while the backup
> is ongoing. Will the firefox pages still be in memory or not?
>   
The patch with the subject "[PATCH] vmscan: evict use-once pages first (v3)"
together with this patch should make sure that it stays in memory.
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