From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f174.google.com (mail-qc0-f174.google.com [209.85.216.174]) by kanga.kvack.org (Postfix) with ESMTP id 343246B0035 for ; Thu, 6 Mar 2014 16:15:11 -0500 (EST) Received: by mail-qc0-f174.google.com with SMTP id x13so3603559qcv.19 for ; Thu, 06 Mar 2014 13:15:11 -0800 (PST) Received: from mail-qg0-x22c.google.com (mail-qg0-x22c.google.com [2607:f8b0:400d:c04::22c]) by mx.google.com with ESMTPS id 4si3824384qat.98.2014.03.06.13.15.10 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 06 Mar 2014 13:15:10 -0800 (PST) Received: by mail-qg0-f44.google.com with SMTP id a108so8910728qge.3 for ; Thu, 06 Mar 2014 13:15:10 -0800 (PST) Date: Thu, 6 Mar 2014 16:15:06 -0500 From: Tejun Heo Subject: Re: [patch 10/11] mm, memcg: add memory.oom_control notification for system oom Message-ID: <20140306211506.GD17902@htj.dyndns.org> References: 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: David Rientjes Cc: Andrew Morton , Johannes Weiner , Michal Hocko , KAMEZAWA Hiroyuki , Christoph Lameter , Pekka Enberg , Mel Gorman , Oleg Nesterov , Rik van Riel , Jianguo Wu , Tim Hockin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org On Tue, Mar 04, 2014 at 07:59:41PM -0800, David Rientjes wrote: > Now that process handling system oom conditions have access to a small > amount of memory reserves, we need a way to notify those process on > system oom conditions. > > When a userspace process waits on the root memcg's memory.oom_control, it > will wake up anytime there is a system oom condition. > > This is a special case of oom notifiers since it doesn't subsequently > notify all memcgs under the root memcg (all memcgs on the system). We > don't want to trigger those oom handlers which are set aside specifically > for true memcg oom notifications that disable their own oom killers to > enforce their own oom policy, for example. > > Signed-off-by: David Rientjes Until consensus on the whole approach can be reached, Nacked-by: Tejun Heo 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