From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id 1A7276B011F for ; Fri, 6 Mar 2009 11:46:16 -0500 (EST) Message-ID: <49B153A3.8090906@oracle.com> Date: Fri, 06 Mar 2009 08:47:31 -0800 From: Randy Dunlap MIME-Version: 1.0 Subject: Re: [RFC][PATCH 3/3] memcg documenation soft limit (Yet Another One) References: <20090306092323.21063.93169.sendpatchset@localhost.localdomain> <20090306185440.66b92ca3.kamezawa.hiroyu@jp.fujitsu.com> <20090306193438.8084837d.kamezawa.hiroyu@jp.fujitsu.com> <20090306193821.ca2fb628.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20090306193821.ca2fb628.kamezawa.hiroyu@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: Balbir Singh , linux-mm@kvack.org, Sudhir Kumar , YAMAMOTO Takashi , Bharata B Rao , Paul Menage , lizf@cn.fujitsu.com, linux-kernel@vger.kernel.org, KOSAKI Motohiro , David Rientjes , Pavel Emelianov , Dhaval Giani , Rik van Riel , Andrew Morton List-ID: KAMEZAWA Hiroyuki wrote: > From: KAMEZAWA Hiroyuki > > Documentation for softlimit (3/3) > > Signed-off-by: KAMEZAWA Hiroyuki > --- > Documentation/cgroups/memory.txt | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > Index: mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt > =================================================================== > --- mmotm-2.6.29-Mar3.orig/Documentation/cgroups/memory.txt > +++ mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt > @@ -322,6 +322,25 @@ will be charged as a new owner of it. > - a cgroup which uses hierarchy and it has child cgroup. > - a cgroup which uses hierarchy and not the root of hierarchy. > > +5.4 softlimit > + Memory cgroup supports softlimit and has 2 params for control. parameters > + - memory.softlimit_in_bytes > + - softlimit to this cgroup. softlimit for this cgroup (i.e., no beginning '-' and no ending '.') > + - memory.softlimit_priority. > + - priority of this cgroup at softlimit reclaim. priority of this cgroup at softlimit reclaim > + Allowed priority level is 3-0 and 3 is the lowest. Not very user friendly... > + If 0, this cgroup will not be target of softlimit. > + > + At memory shortage of the system (or local node/zone), softlimit helps > + kswapd(), a global memory recalim kernel thread, and inform victim cgroup reclaim informs > + to be shrinked to kswapd. > + > + Victim selection logic: > + The kernel searches from the lowest priroty(3) up to the highest(1). priority 0 ?? (from above) > + If it find a cgroup witch has memory larger than softlimit, steal memory finds which > + from it. > + If multiple cgroups are on the same priority, each cgroup wil be a will > + victim in turn. > > 6. Hierarchy support -- ~Randy -- 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