From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754732AbbJZOYp (ORCPT <rfc822;w@1wt.eu>);
	Mon, 26 Oct 2015 10:24:45 -0400
Received: from e06smtp15.uk.ibm.com ([195.75.94.111]:34980 "EHLO
	e06smtp15.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1754318AbbJZOYn (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 26 Oct 2015 10:24:43 -0400
X-IBM-Helo: d06dlp03.portsmouth.uk.ibm.com
X-IBM-MailFrom: holzheu@linux.vnet.ibm.com
X-IBM-RcptTo: linux-kernel@vger.kernel.org
Date: Mon, 26 Oct 2015 15:24:36 +0100
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org,
        Tejun Heo <tj@kernel.org>, Oleg Nesterov <oleg@redhat.com>,
        Ingo Molnar <mingo@kernel.org>, Rik van Riel <riel@redhat.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Tobias Orlamuende <orlam@de.ibm.com>
Subject: Re: [RFC][PATCH] sched: Start stopper early
Message-ID: <20151026152436.754c65b0@holzheu>
In-Reply-To: <20151016120125.GD6354@osiris>
References: <20151007084110.GX2881@worktop.programming.kicks-ass.net>
	<20151016082212.GC4684@osiris>
	<20151016095706.GQ3816@twins.programming.kicks-ass.net>
	<20151016120125.GD6354@osiris>
Organization: IBM
X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i686-pc-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-TM-AS-MML: disable
X-Content-Scanned: Fidelis XPS MAILER
x-cbid: 15102614-0021-0000-0000-000007BECA2C
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, 16 Oct 2015 14:01:25 +0200
Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

> On Fri, Oct 16, 2015 at 11:57:06AM +0200, Peter Zijlstra wrote:
> > On Fri, Oct 16, 2015 at 10:22:12AM +0200, Heiko Carstens wrote:
> > > So, actually this doesn't fix the bug and it _seems_ to be reproducible.
> > > 
> > > [ FWIW, I will be offline for the next two weeks ]
> > 
> > So the series from Oleg would be good to try; I can make a git tree for
> > you, or otherwise stuff the lot into a single patch.
> > 
> > Should I be talking to someone else whilst you're having down time?
> 
> Yes Michael Holzheu (on cc), can take care of this.

I tested Peter's "tip/master" and "tip/sched/core". With the following
commit our issue seems to be fixed:

2b621a085a ("stop_machine: Change cpu_stop_queue_two_works() to rely
on stopper->enabled")

When do you plan to merge the patch series in the mainline kernel?

Regards,
Michael