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

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Message-ID: <2f11576a0905190855j658a608en36f52e8eecfdf6fd@mail.gmail.com>
Date:	Wed, 20 May 2009 00:55:22 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Wu Fengguang <fengguang.wu@...el.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>,
	"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

>> Another (amazing) finding of the test is, only around 1/10 mapped pages
>> are actively referenced in the absence of user activities.
>>
>> Shall we protect the remaining 9/10 inactive ones? This is a question ;-)
>
> I believe we already do, due to the active list not being
> scanned if none of the streaming IO pages get promoted to
> the active list.

his workload is,

lseek(0)
read(110 * 4096)
lseek(100 * 4096)
read(110 * 4096)
lseek(200 * 4096)
read(110 * 4096)
....

IOW, 90% pages move into inactive list, 10% (overlapped readed) pages
move into active list.
he think it is file server simulation.

I don't know it is good simulation or not.
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