From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx155.postini.com [74.125.245.155]) by kanga.kvack.org (Postfix) with SMTP id 16AAE6B0002 for ; Mon, 1 Apr 2013 06:02:57 -0400 (EDT) Received: from m4.gw.fujitsu.co.jp (unknown [10.0.50.74]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id 715403EE0AE for ; Mon, 1 Apr 2013 19:02:55 +0900 (JST) Received: from smail (m4 [127.0.0.1]) by outgoing.m4.gw.fujitsu.co.jp (Postfix) with ESMTP id 568A245DE52 for ; Mon, 1 Apr 2013 19:02:55 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (s4.gw.fujitsu.co.jp [10.0.50.94]) by m4.gw.fujitsu.co.jp (Postfix) with ESMTP id 3F6D545DE4F for ; Mon, 1 Apr 2013 19:02:55 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id 339EA1DB8042 for ; Mon, 1 Apr 2013 19:02:55 +0900 (JST) Received: from ml14.s.css.fujitsu.com (ml14.s.css.fujitsu.com [10.240.81.134]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id D88401DB803E for ; Mon, 1 Apr 2013 19:02:54 +0900 (JST) Message-ID: <51595B3C.5090900@jp.fujitsu.com> Date: Mon, 01 Apr 2013 19:02:36 +0900 From: Kamezawa Hiroyuki MIME-Version: 1.0 Subject: Re: [PATCH] memcg: implement boost mode References: <1364801670-10241-1-git-send-email-glommer@parallels.com> <51595311.7070509@jp.fujitsu.com> <515953AE.3000403@parallels.com> <20130401093740.GA30749@dhcp22.suse.cz> In-Reply-To: <20130401093740.GA30749@dhcp22.suse.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Glauber Costa , linux-mm@kvack.org, Johannes Weiner , Andrew Morton , cgroups@vger.kernel.org, Tejun Heo (2013/04/01 18:37), Michal Hocko wrote: > On Mon 01-04-13 13:30:22, Glauber Costa wrote: >> On 04/01/2013 01:27 PM, Kamezawa Hiroyuki wrote: >>> (2013/04/01 16:34), Glauber Costa wrote: >>>> There are scenarios in which we would like our programs to run faster. >>>> It is a hassle, when they are contained in memcg, that some of its >>>> allocations will fail and start triggering reclaim. This is not good >>>> for the program, that will now be slower. >>>> >>>> This patch implements boost mode for memcg. It exposes a u64 file >>>> "memcg boost". Every time you write anything to it, it will reduce the >>>> counters by ~20 %. Note that we don't want to actually reclaim pages, >>>> which would defeat the very goal of boost mode. We just make the >>>> res_counters able to accomodate more. >>>> >>>> This file is also available in the root cgroup. But with a slightly >>>> different effect. Writing to it will make more memory physically >>>> available so our programs can profit. >>>> >>>> Please ack and apply. >>>> >>> Nack. >>> >>>> Signed-off-by: Glauber Costa >>> >>> Please update limit temporary. If you need call-shrink-explicitly-by-user, >>> I think you can add it. >>> >> >> I don't want to shrink memory because that will make applications >> slower. I want them to be faster, so they need to have more memory. >> There is solid research backing up my approach: >> http://www.dilbert.com/fast/2008-05-08/ > > :) > ;) -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