From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx175.postini.com [74.125.245.175]) by kanga.kvack.org (Postfix) with SMTP id 3AD9D6B005D for ; Wed, 9 Jan 2013 15:39:53 -0500 (EST) Received: by mail-pa0-f52.google.com with SMTP id fb1so1263583pad.39 for ; Wed, 09 Jan 2013 12:39:52 -0800 (PST) Date: Wed, 9 Jan 2013 12:39:45 -0800 From: Tejun Heo Subject: Re: [PATCH 1/2] Add mempressure cgroup Message-ID: <20130109203945.GB20454@htj.dyndns.org> References: <20130104082751.GA22227@lizard.gateway.2wire.net> <1357288152-23625-1-git-send-email-anton.vorontsov@linaro.org> <20130109203731.GA20454@htj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130109203731.GA20454@htj.dyndns.org> Sender: owner-linux-mm@kvack.org List-ID: To: Anton Vorontsov Cc: David Rientjes , Pekka Enberg , Mel Gorman , Glauber Costa , Michal Hocko , "Kirill A. Shutemov" , Luiz Capitulino , Andrew Morton , Greg Thelen , Leonid Moiseichuk , KOSAKI Motohiro , Minchan Kim , Bartlomiej Zolnierkiewicz , John Stultz , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org, patches@linaro.org, kernel-team@android.com On Wed, Jan 09, 2013 at 12:37:31PM -0800, Tejun Heo wrote: > Hello, > > Can you please cc me too when posting further patches? I kinda missed > the whole discussion upto this point. > > On Fri, Jan 04, 2013 at 12:29:11AM -0800, Anton Vorontsov wrote: > > This commit implements David Rientjes' idea of mempressure cgroup. > > > > The main characteristics are the same to what I've tried to add to vmevent > > API; internally, it uses Mel Gorman's idea of scanned/reclaimed ratio for > > pressure index calculation. But we don't expose the index to the userland. > > Instead, there are three levels of the pressure: > > > > o low (just reclaiming, e.g. caches are draining); > > o medium (allocation cost becomes high, e.g. swapping); > > o oom (about to oom very soon). > > > > The rationale behind exposing levels and not the raw pressure index > > described here: http://lkml.org/lkml/2012/11/16/675 > > > > For a task it is possible to be in both cpusets, memcg and mempressure > > cgroups, so by rearranging the tasks it is possible to watch a specific > > pressure (i.e. caused by cpuset and/or memcg). > > So, cgroup is headed towards single hierarchy. Dunno how much it > would affect mempressure but it probably isn't wise to design with > focus on multiple hierarchies. Also, how are you implementing hierarchical behavior? All controllers should support hierarchy. Can you please explain how the interface would work in detail? 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