From: Rik van Riel <riel@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Linux kernel Mailing List <linux-kernel@vger.kernel.org>,
shak <dshaks@redhat.com>
Subject: Re: [PATCH -mm] change anon_vma linking to fix multi-process server scalability issue
Date: Thu, 11 Feb 2010 16:49:35 -0500 [thread overview]
Message-ID: <4B747B6F.1090209@redhat.com> (raw)
In-Reply-To: <20100211130422.f262be71.akpm@linux-foundation.org>
On 02/11/2010 04:04 PM, Andrew Morton wrote:
> On Thu, 28 Jan 2010 00:20:00 -0500
> Rik van Riel<riel@redhat.com> wrote:
>
>> The old anon_vma code can lead to scalability issues with heavily
>> forking workloads. Specifically, each anon_vma will be shared
>> between the parent process and all its child processes.
Some test results:
Without the anon_vma changes, when AIM7 hits around 9.7k
users (on a test box with 16GB RAM and not quite enough IO),
the system ends up running >99% in system time, with every
CPU on the same anon_vma lock in the pageout code.
With these changes, AIM7 hits the cross-over point around
29.7k users. This happens with ~99% IO wait time, there
never seems to be any spike in system time. The anon_vma
lock contention appears to be resolved.
--
All rights reversed.
prev parent reply other threads:[~2010-02-11 21:49 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
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 ` Rik van Riel [this message]
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