linux-kernel - Re: [PATCH 6/8] mm: fix anonymous dirtying

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Date:	Tue, 08 Sep 2009 18:23:36 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 6/8] mm: fix anonymous dirtying

Hugh Dickins wrote:
> do_anonymous_page() has been wrong to dirty the pte regardless.
> If it's not going to mark the pte writable, then it won't help
> to mark it dirty here, and clogs up memory with pages which will
> need swap instead of being thrown away.  Especially wrong if no
> overcommit is chosen, and this vma is not yet VM_ACCOUNTed -
> we could exceed the limit and OOM despite no overcommit.
> 
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> Cc: stable@...nel.org

Acked-by: Rik van Riel <riel@...hat.com>

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