linux-kernel - Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp

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Message-ID: <4B670258.6060109@redhat.com>
Date:	Mon, 01 Feb 2010 11:33:28 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	lwoodman@...hat.com, akpm@...ux-foundation.org,
	Lee Schermerhorn <Lee.Schermerhorn@...com>, aarcange@...hat.com
Subject: Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma
 in do_wp_page

On 02/01/2010 10:25 AM, Minchan Kim wrote:

>> Signed-off-by: Rik van Riel<riel@...hat.com>
> Reviewed-by: Minchan Kim<minchan.kim@...il.com>
>
> Let me have a question for my understanding.
>
> Still, don't we have a probability of O(N) in case of parent's page
> at worst case?

Yes, we do.

However, this can only happen for 1/N pages.

Having O(N) for every page can totally bog down a system,
but only running into that worst case every 1/N pages should
make things run OK again.

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