From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx116.postini.com [74.125.245.116]) by kanga.kvack.org (Postfix) with SMTP id 496D56B0005 for ; Sat, 20 Apr 2013 21:53:18 -0400 (EDT) Received: by mail-da0-f52.google.com with SMTP id j17so206849dan.25 for ; Sat, 20 Apr 2013 18:53:17 -0700 (PDT) Date: Sat, 20 Apr 2013 18:53:12 -0700 From: Tejun Heo Subject: Re: memcg: softlimit on internal nodes Message-ID: <20130421015312.GD19097@mtj.dyndns.org> References: <20130420002620.GA17179@mtj.dyndns.org> <20130420004221.GB17179@mtj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Greg Thelen Cc: Michal Hocko , Johannes Weiner , Balbir Singh , KAMEZAWA Hiroyuki , cgroups@vger.kernel.org, "linux-mm@kvack.org" , Hugh Dickins , Ying Han , Glauber Costa , Michel Lespinasse Hey, Greg. On Fri, Apr 19, 2013 at 08:35:12PM -0700, Greg Thelen wrote: > > As for how actually to clean up this yet another mess in memcg, I > > don't know. Maybe introduce completely new knobs - say, > > oom_threshold, reclaim_threshold, and reclaim_trigger - and alias > > hardlimit to oom_threshold and softlimit to recalim_trigger? BTW, > > "softlimit" should default to 0. Nothing else makes any sense. > > I agree that the hard limit could be called the oom_threshold. > > The meaning of the term reclaim_threshold is not obvious to me. I'd > prefer to call the soft limit a reclaim_target. System global > pressure can steal memory from a cgroup until its usage drops to the > soft limit (aka reclaim_target). Pressure will try to avoid stealing > memory below the reclaim target. The soft limit (reclaim_target) is > not checked until global pressure exists. Currently we do not have a > knob to set a reclaim_threshold, such that when usage exceeds the > reclaim_threshold async reclaim is queued. We are not discussing > triggering anything when soft limit is exceeded. Yeah, reclaim_target seems like a better name for it. Thanks. -- tejun -- 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