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Date: Mon, 04 Jan 2010 18:20:16 -0500
From: Rik van Riel <riel@redhat.com>
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Subject: Re: [RFC][PATCH 0/8] Speculative pagefault -v3
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To: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "minchan.kim@gmail.com" <minchan.kim@gmail.com>, cl@linux-foundation.org, "hugh.dickins" <hugh.dickins@tiscali.co.uk>, Nick Piggin <nickpiggin@yahoo.com.au>, Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@linux-foundation.org>
List-ID: <linux-mm.kvack.org>

On 01/04/2010 04:46 PM, Peter Zijlstra wrote:
> On Mon, 2010-01-04 at 16:41 -0500, Rik van Riel wrote:
>> On 01/04/2010 01:24 PM, Peter Zijlstra wrote:
>>> Patch series implementing speculative page faults for x86.
>>
>> Fun, but why do we need this?
>
> People were once again concerned with mmap_sem contention on threaded
> apps on large machines. Kame-san posted some patches, but I felt they
> weren't quite crazy enough ;-)

In that case, I assume that somebody else (maybe Kame-san or
Christoph) will end up posting a benchmark that shows how
these patches help.

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