From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx141.postini.com [74.125.245.141]) by kanga.kvack.org (Postfix) with SMTP id F41B06B004D for ; Tue, 26 Jun 2012 18:17:28 -0400 (EDT) Received: by dakp5 with SMTP id p5so579406dak.14 for ; Tue, 26 Jun 2012 15:17:27 -0700 (PDT) Date: Tue, 26 Jun 2012 15:17:23 -0700 From: Tejun Heo Subject: Re: [PATCH 2/2] memcg: first step towards hierarchical controller Message-ID: <20120626221723.GB15811@google.com> References: <1340725634-9017-1-git-send-email-glommer@parallels.com> <1340725634-9017-3-git-send-email-glommer@parallels.com> <20120626180451.GP3869@google.com> <20120626220809.GA4653@tiehlicka.suse.cz> <20120626221452.GA15811@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120626221452.GA15811@google.com> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Glauber Costa , cgroups@vger.kernel.org, linux-mm@kvack.org, kamezawa.hiroyu@jp.fujitsu.com, Johannes Weiner , Andrew Morton On Tue, Jun 26, 2012 at 03:14:52PM -0700, Tejun Heo wrote: > Hello, Michal. > > On Wed, Jun 27, 2012 at 12:08:09AM +0200, Michal Hocko wrote: > > According to my experience, people usually create deeper subtrees > > just because they want to have memcg hierarchy together with other > > controller(s) and the other controller requires a different topology > > but then they do not care about memory.* attributes in parents. > > Those cases are not affected by this change because parents are > > unlimited by default. > > Deeper subtrees without hierarchy and independent limits are usually > > mis-configurations, and we would like to hear about those to help to fix > > them, or they are unfixable usecases which we want to know about as well > > (because then we have a blocker for the unified cgroup hierarchy, don't > > we). > > Yeah, this is something I'm seriously considering doing from cgroup > core. ie. generating a warning message if the user nests cgroups w/ > controllers which don't support full hierarchy. BTW, this is another reason I'm suggesting mount time option so that cgroup core can be told that the specific controller is hierarchy-aware. 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