From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id F364E6005A4 for ; Mon, 4 Jan 2010 19:31:55 -0500 (EST) Received: from m2.gw.fujitsu.co.jp ([10.0.50.72]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id o050VrEU007722 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Tue, 5 Jan 2010 09:31:53 +0900 Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 7AB4645DE61 for ; Tue, 5 Jan 2010 09:31:53 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 3BEC345DE4E for ; Tue, 5 Jan 2010 09:31:53 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 1FB721DB803E for ; Tue, 5 Jan 2010 09:31:53 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.249.87.106]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id CEB0E1DB803A for ; Tue, 5 Jan 2010 09:31:52 +0900 (JST) Date: Tue, 5 Jan 2010 09:28:36 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [RFC][PATCH 0/8] Speculative pagefault -v3 Message-Id: <20100105092836.a7feb26c.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: References: <20100104182429.833180340@chello.nl> <4B42606F.3000906@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: Rik van Riel , Peter Zijlstra , "Paul E. McKenney" , Peter Zijlstra , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "minchan.kim@gmail.com" , "hugh.dickins" , Nick Piggin , Ingo Molnar , Linus Torvalds List-ID: On Mon, 4 Jan 2010 15:59:45 -0600 (CST) Christoph Lameter wrote: > On Mon, 4 Jan 2010, Rik van Riel wrote: > > > Fun, but why do we need this? > > > > What improvements did you measure? > > If it measures up to Kame-sans approach then the possible pagefault rate > will at least double ... > On 4-core/2 socket machine ;) More than page fault rate, important fact is that we can reduce cache contention by skipping mmap_sem in some situation. And I think we have some chances. Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org