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

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Message-ID: <4A04430F.1090006@redhat.com>
Date:	Fri, 08 May 2009 10:34:55 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class
 citizen

Christoph Lameter wrote:
> On Fri, 8 May 2009, Minchan Kim wrote:
> 
>>>> Why did you said that "The page_referenced() path will only cover the ""_text_"" section" ?
>>>> Could you elaborate please ?
>>> I was under the wild assumption that only the _text_ section will be
>>> PROT_EXEC mapped.  No?
>> Yes. I support your idea.
> 
> Why do PROT_EXEC mapped segments deserve special treatment? What about the
> other memory segments of the process? Essentials like stack, heap and
> data segments of the libraries?

Christopher, please look at what changed in the VM
since 2.6.29 and you will understand how the stack,
heap and data segments already get special treatment.

Please stop pretending you're an idiot.

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