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

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Date:	Sun, 10 May 2009 23:59:54 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, tytso@....edu, linux-mm@...ck.org,
	elladan@...imo.com, npiggin@...e.de, cl@...ux-foundation.org,
	minchan.kim@...il.com
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class 
	citizen

Hi

>> Secondly it moves the pressure from the storage volume holding the system
>> binaries and libraries to the swap device which already has to deal with
>> a lot of random (and thus expensive) I/O, as well as the users filestore
>> for mapped objects there - which may even be on a USB thumbdrive.
>
> Preserving the PROT_EXEC pages over streaming IO should not
> move much (if any) pressure from the file LRUs onto the
> swap-backed (anon) LRUs.

I don't think this is good example.
this issue is already solved by your patch. Thus this patch don't
improve streaming IO issue.
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