From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx181.postini.com [74.125.245.181]) by kanga.kvack.org (Postfix) with SMTP id 2914D6B005D for ; Fri, 4 Jan 2013 10:04:35 -0500 (EST) Date: Fri, 4 Jan 2013 17:05:40 +0200 From: "Kirill A. Shutemov" Subject: Re: [PATCH 1/2] Add mempressure cgroup Message-ID: <20130104150540.GA14153@shutemov.name> References: <20130104082751.GA22227@lizard.gateway.2wire.net> <1357288152-23625-1-git-send-email-anton.vorontsov@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1357288152-23625-1-git-send-email-anton.vorontsov@linaro.org> Sender: owner-linux-mm@kvack.org List-ID: To: Anton Vorontsov Cc: David Rientjes , Pekka Enberg , Mel Gorman , Glauber Costa , Michal Hocko , 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 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). > > Note that while this adds the cgroups support, the code is well separated > and eventually we might add a lightweight, non-cgroups API, i.e. vmevent. > But this is another story. > > Signed-off-by: Anton Vorontsov Acked-by: Kirill A. Shutemov -- Kirill A. Shutemov -- 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