Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934382Ab2JXDoW (ORCPT ); Tue, 23 Oct 2012 23:44:22 -0400 Received: from mail-vc0-f174.google.com ([209.85.220.174]:44941 "EHLO mail-vc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934056Ab2JXDoT (ORCPT ); Tue, 23 Oct 2012 23:44:19 -0400 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 To: Balbir Singh Cc: Michal Hocko , "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: 1654 Lines: 41 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 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/