linux-kernel - Re: process hangs on do

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Message-ID: <20121023101500.GE15397@dhcp22.suse.cz>
Date:	Tue, 23 Oct 2012 12:15:00 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Qiang Gao <gaoqiangscut@...il.com>
Cc:	Balbir Singh <bsingharora@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: process hangs on do_exit when oom happens

On Tue 23-10-12 18:10:33, Qiang Gao wrote:
> On Tue, Oct 23, 2012 at 5:50 PM, Michal Hocko <mhocko@...e.cz> 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.
-- 
Michal Hocko
SUSE Labs
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