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

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Message-Id: <20090512120002.D616.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 May 2009 12:00:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"riel@...hat.com" <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@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"cl@...ux-foundation.org" <cl@...ux-foundation.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen

> side effects
> ------------
> 
> This patch is safe in general, it restores the pre-2.6.28 mmap() behavior
> but in a much smaller and well targeted scope.
> 
> One may worry about some one to abuse the PROT_EXEC heuristic.  But as
> Andrew Morton stated, there are other tricks to getting that sort of boost.
> 
> Another concern is the PROT_EXEC mapped pages growing large in rare cases,
> and therefore hurting reclaim efficiency. But a sane application targeted for
> large audience will never use PROT_EXEC for data mappings. If some home made
> application tries to abuse that bit, it shall be aware of the consequences,
> which won't be disastrous even in the worst case.

ok, I lose.
if you can post good mesurement result, I'll ack this.



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