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 6FDA86B004D for ; Fri, 6 Nov 2009 14:20:58 -0500 (EST) Received: from m3.gw.fujitsu.co.jp ([10.0.50.73]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id nA6JKueL022306 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Sat, 7 Nov 2009 04:20:56 +0900 Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id DF4A445DE4F for ; Sat, 7 Nov 2009 04:20:55 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id BE1F945DD77 for ; Sat, 7 Nov 2009 04:20:55 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id A3F441DB8037 for ; Sat, 7 Nov 2009 04:20:55 +0900 (JST) Received: from ml11.s.css.fujitsu.com (ml11.s.css.fujitsu.com [10.249.87.101]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 5A50B1DB803B for ; Sat, 7 Nov 2009 04:20:52 +0900 (JST) Message-ID: In-Reply-To: References: <20091104234923.GA25306@redhat.com> <20091106101106.8115e0f1.kamezawa.hiroyu@jp.fujitsu.com> <20091106122344.51118116.kamezawa.hiroyu@jp.fujitsu.com> Date: Sat, 7 Nov 2009 04:20:51 +0900 (JST) Subject: Re: [MM] Make mm counters per cpu instead of atomic V2 From: "KAMEZAWA Hiroyuki" MIME-Version: 1.0 Content-Type: text/plain;charset=iso-2022-jp Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: KAMEZAWA Hiroyuki , Dave Jones , "hugh.dickins@tiscali.co.uk" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Tejun Heo List-ID: Christoph Lameter wrote: > On Sat, 7 Nov 2009, KAMEZAWA Hiroyuki wrote: > >> And allocate mm->usage only when the first CLONE_THREAD is specified. > > Ok. > >> if (mm->usage) >> access per cpu >> else >> atomic_long_xxx > > If we just have one thread: Do we need atomic access at all? > Unfortunately, kswapd/vmscan touch this. 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