From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
lwoodman@redhat.com, akpm@linux-foundation.org,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
aarcange@redhat.com
Subject: Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp_page
Date: Mon, 01 Feb 2010 11:33:28 -0500 [thread overview]
Message-ID: <4B670258.6060109@redhat.com> (raw)
In-Reply-To: <1265037918.20322.32.camel@barrios-desktop>
On 02/01/2010 10:25 AM, Minchan Kim wrote:
>> Signed-off-by: Rik van Riel<riel@redhat.com>
> Reviewed-by: Minchan Kim<minchan.kim@gmail.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.
--
All rights reversed.
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
lwoodman@redhat.com, akpm@linux-foundation.org,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
aarcange@redhat.com
Subject: Re: [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp_page
Date: Mon, 01 Feb 2010 11:33:28 -0500 [thread overview]
Message-ID: <4B670258.6060109@redhat.com> (raw)
In-Reply-To: <1265037918.20322.32.camel@barrios-desktop>
On 02/01/2010 10:25 AM, Minchan Kim wrote:
>> Signed-off-by: Rik van Riel<riel@redhat.com>
> Reviewed-by: Minchan Kim<minchan.kim@gmail.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.
--
All rights reversed.
--
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next prev parent reply other threads:[~2010-02-01 16:35 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-28 5:20 [PATCH -mm] change anon_vma linking to fix multi-process server scalability issue Rik van Riel
2010-01-28 5:20 ` Rik van Riel
2010-01-28 6:43 ` [PATCH -mm] rmap: remove obsolete check from __page_check_anon_rmap Rik van Riel
2010-01-28 6:43 ` Rik van Riel
2010-02-01 15:26 ` Minchan Kim
2010-02-01 15:26 ` Minchan Kim
2010-01-28 6:43 ` [PATCH -mm] rmap: move exclusively owned pages to own anon_vma in do_wp_page Rik van Riel
2010-01-28 6:43 ` Rik van Riel
2010-02-01 15:25 ` Minchan Kim
2010-02-01 15:25 ` Minchan Kim
2010-02-01 16:33 ` Rik van Riel [this message]
2010-02-01 16:33 ` Rik van Riel
2010-01-28 16:37 ` [PATCH -mm] change anon_vma linking to fix multi-process server scalability issue Minchan Kim
2010-01-28 16:37 ` Minchan Kim
2010-01-28 17:24 ` Rik van Riel
2010-01-28 17:24 ` Rik van Riel
2010-01-29 0:55 ` Minchan Kim
2010-01-29 0:55 ` Minchan Kim
2010-01-29 1:18 ` Rik van Riel
2010-01-29 1:18 ` Rik van Riel
2010-01-29 23:14 ` Andrew Morton
2010-01-29 23:14 ` Andrew Morton
2010-01-29 23:57 ` Rik van Riel
2010-01-29 23:57 ` Rik van Riel
2010-01-30 0:22 ` [PATCH -mm] further cleanups to " Rik van Riel
2010-01-30 0:22 ` Rik van Riel
2010-01-30 0:34 ` [PATCH -mm] remove VM_LOCK_RMAP code Rik van Riel
2010-01-30 0:34 ` Rik van Riel
2010-02-01 6:15 ` Nick Piggin
2010-02-01 6:15 ` Nick Piggin
2010-02-01 15:55 ` Rik van Riel
2010-02-01 15:55 ` Rik van Riel
2010-02-02 6:44 ` Nick Piggin
2010-02-02 6:44 ` Nick Piggin
[not found] ` <20100211130422.f262be71.akpm@linux-foundation.org>
2010-02-11 21:49 ` [PATCH -mm] change anon_vma linking to fix multi-process server scalability issue Rik van Riel
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