linux-kernel - Re: [PATCH 1/2] mm: Take all anon_vma locks in anon_vma

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Message-ID: <alpine.LFD.2.00.1005030940490.5478@i5.linux-foundation.org>
Date:	Mon, 3 May 2010 09:41:20 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
cc:	akpm@...ux-foundation.org, Mel Gorman <mel@....ul.ie>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 1/2] mm: Take all anon_vma locks in anon_vma_lock



On Mon, 3 May 2010, Rik van Riel wrote:
> 
> Both the page migration code and the transparent hugepage patches expect
> 100% reliable rmap lookups and use page_lock_anon_vma(page) to prevent
> races with mmap, munmap, expand_stack, etc.

Pretty much same comments as for the other one. Why are we pandering to 
the case that is/should be unusual?

		Linus
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