From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 1482360021B for ; Fri, 4 Dec 2009 01:56:14 -0500 (EST) Received: from m3.gw.fujitsu.co.jp ([10.0.50.73]) by fgwmail5.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id nB46uBou027745 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Fri, 4 Dec 2009 15:56:11 +0900 Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 8EAC445DE52 for ; Fri, 4 Dec 2009 15:56:11 +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 6BECD45DE4E for ; Fri, 4 Dec 2009 15:56:11 +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 51DA51DB8038 for ; Fri, 4 Dec 2009 15:56:11 +0900 (JST) Received: from m107.s.css.fujitsu.com (m107.s.css.fujitsu.com [10.249.87.107]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 0887C1DB8041 for ; Fri, 4 Dec 2009 15:56:11 +0900 (JST) Date: Fri, 4 Dec 2009 15:53:17 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [PATCH -mmotm 0/7] memcg: move charge at task migration (04/Dec) Message-Id: <20091204155317.2d570a55.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20091204144609.b61cc8c4.nishimura@mxp.nes.nec.co.jp> References: <20091204144609.b61cc8c4.nishimura@mxp.nes.nec.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Daisuke Nishimura Cc: Andrew Morton , Balbir Singh , Li Zefan , Paul Menage , linux-mm List-ID: On Fri, 4 Dec 2009 14:46:09 +0900 Daisuke Nishimura wrote: > Hi. > > These are current patches of my move-charge-at-task-migration feature. > > The biggest change from previous(19/Nov) version is improvement in performance. > > I measured the elapsed time of "echo [pid] > /tasks" on KVM guest > with 4CPU/4GB(Xeon/3GHz) in three patterns: > > (1) / -> /00 > (2) /00 -> /01 > > we don't need to call res_counter_uncharge against root, so (1) would be smaller > than (2). > > (3) /00(setting mem.limit to half size of total) -> /01 > > To compare the overhead of anon and swap. > > In 19/Nov version: > | 252M | 512M | 1G > -----+--------+--------+-------- > (1) | 0.21 | 0.41 | 0.821 > -----+--------+--------+-------- > (2) | 0.43 | 0.85 | 1.71 > -----+--------+--------+-------- > (3) | 0.40 | 0.81 | 1.62 > -----+--------+--------+-------- > > In this version: > | 252M | 512M | 1G > -----+--------+--------+-------- > (1) | 0.15 | 0.30 | 0.60 > -----+--------+--------+-------- > (2) | 0.15 | 0.30 | 0.60 > -----+--------+--------+-------- > (3) | 0.22 | 0.44 | 0.89 > Nice ! > Please read patch descriptions for each patch([4/7],[7/7]) for details of > how and how much the patch improved the performance. > > [1/7] cgroup: introduce cancel_attach() > [2/7] memcg: add interface to move charge at task migration > [3/7] memcg: move charges of anonymous page > [4/7] memcg: improbe performance in moving charge > [5/7] memcg: avoid oom during moving charge > [6/7] memcg: move charges of anonymous swap > [7/7] memcg: improbe performance in moving swap charge > > Current version supports only recharge of non-shared(mapcount == 1) anonymous pages > and swaps of those pages. I think it's enough as a first step. > Hmm. shared swap entry (very rare one?) is moved ? 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