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

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Message-ID: <2f11576a0905081041nb26140bx56394f8e232fb59e@mail.gmail.com>
Date:	Sat, 9 May 2009 02:41:26 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.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>,
	Rik van Riel <riel@...hat.com>,
	"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>
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class 
	citizen

>> > > 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?

Currently, file-backed page and swap-backed page are lived in separate lru.

text section: file
stack: anon
heap: anon
data segment: anon

and, streaming IO problem don't affect swap-backed lru. it's only
file-backed lru problem.
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