From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx183.postini.com [74.125.245.183]) by kanga.kvack.org (Postfix) with SMTP id E59EB6B0070 for ; Tue, 23 Oct 2012 23:44:18 -0400 (EDT) Received: by mail-vb0-f41.google.com with SMTP id v13so103839vbk.14 for ; Tue, 23 Oct 2012 20:44:17 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <20121019160425.GA10175@dhcp22.suse.cz> <20121023095028.GD15397@dhcp22.suse.cz> <20121023101500.GE15397@dhcp22.suse.cz> Date: Wed, 24 Oct 2012 11:44:17 +0800 Message-ID: Subject: Re: process hangs on do_exit when oom happens From: Qiang Gao Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Balbir Singh Cc: Michal Hocko , "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , "cgroups@vger.kernel.org" , linux-mm@kvack.org On Wed, Oct 24, 2012 at 1:43 AM, Balbir Singh wrote: > On Tue, Oct 23, 2012 at 3:45 PM, Michal Hocko wrote: >> On Tue 23-10-12 18:10:33, Qiang Gao wrote: >>> On Tue, Oct 23, 2012 at 5:50 PM, Michal Hocko wrote: >>> > On Tue 23-10-12 15:18:48, Qiang Gao wrote: >>> >> This process was moved to RT-priority queue when global oom-killer >>> >> happened to boost the recovery of the system.. >>> > >>> > Who did that? oom killer doesn't boost the priority (scheduling class) >>> > AFAIK. >>> > >>> >> but it wasn't get properily dealt with. I still have no idea why where >>> >> the problem is .. >>> > >>> > Well your configuration says that there is no runtime reserved for the >>> > group. >>> > Please refer to Documentation/scheduler/sched-rt-group.txt for more >>> > information. >>> > >> [...] >>> maybe this is not a upstream-kernel bug. the centos/redhat kernel >>> would boost the process to RT prio when the process was selected >>> by oom-killer. >> >> This still looks like your cpu controller is misconfigured. Even if the >> task is promoted to be realtime. > > > Precisely! You need to have rt bandwidth enabled for RT tasks to run, > as a workaround please give the groups some RT bandwidth and then work > out the migration to RT and what should be the defaults on the distro. > > Balbir see https://patchwork.kernel.org/patch/719411/ -- 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