Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757391Ab2JWRn5 (ORCPT ); Tue, 23 Oct 2012 13:43:57 -0400 Received: from mail-vb0-f46.google.com ([209.85.212.46]:65037 "EHLO mail-vb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757154Ab2JWRnz (ORCPT ); Tue, 23 Oct 2012 13:43:55 -0400 MIME-Version: 1.0 In-Reply-To: <20121023101500.GE15397@dhcp22.suse.cz> References: <20121019160425.GA10175@dhcp22.suse.cz> <20121023095028.GD15397@dhcp22.suse.cz> <20121023101500.GE15397@dhcp22.suse.cz> Date: Tue, 23 Oct 2012 23:13:54 +0530 Message-ID: Subject: Re: process hangs on do_exit when oom happens From: Balbir Singh To: Michal Hocko Cc: Qiang Gao , "linux-kernel@vger.kernel.org" , "linux-mmc@vger.kernel.org" , "cgroups@vger.kernel.org" , linux-mm@kvack.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1491 Lines: 37 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/