linux-kernel - Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c

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Message-ID: <20140718053449.GA2039@wolff.to>
Date:	Fri, 18 Jul 2014 00:34:49 -0500
From:	Bruno Wolff III <bruno@...ff.to>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dietmar Eggemann <dietmar.eggemann@....com>,
	Josh Boyer <jwboyer@...hat.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Scheduler regression from
 caffcdd8d27ba78730d5540396ce72ad022aff2c

On Thu, Jul 17, 2014 at 14:35:02 +0200,
  Peter Zijlstra <peterz@...radead.org> wrote:
>
>In any case, can someone who can trigger this run with the below; its
>'clean' for me, but supposedly you'll trigger a FAIL somewhere.

I got a couple of fail messages.

dmesg output is available in the bug as the following attachment:
https://bugzilla.kernel.org/attachment.cgi?id=143361

The part of interest is probably:

[    0.253354] build_sched_groups: got group f255b020 with cpus: 
[    0.253436] build_sched_groups: got group f255b120 with cpus: 
[    0.253519] build_sched_groups: got group f255b1a0 with cpus: 
[    0.253600] build_sched_groups: got group f255b2a0 with cpus: 
[    0.253681] build_sched_groups: got group f255b2e0 with cpus: 
[    0.253762] build_sched_groups: got group f255b320 with cpus: 
[    0.253843] build_sched_groups: got group f255b360 with cpus: 
[    0.254004] build_sched_groups: got group f255b0e0 with cpus: 
[    0.254087] build_sched_groups: got group f255b160 with cpus: 
[    0.254170] build_sched_groups: got group f255b1e0 with cpus: 
[    0.254252] build_sched_groups: FAIL
[    0.254331] build_sched_groups: got group f255b1a0 with cpus: 0
[    0.255004] build_sched_groups: FAIL
[    0.255084] build_sched_groups: got group f255b1e0 with cpus: 1

I also booted with early printk=keepsched_debug as requested by 
Dietmar.
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