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Message-ID: <20151008145059.GA17916@redhat.com>
Date:	Thu, 8 Oct 2015 16:50:59 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 0/3] (Was: [RFC][PATCH] sched: Start stopper early)

On 10/07, Peter Zijlstra wrote:
>
> So Heiko reported some 'interesting' fail where stop_two_cpus() got
> stuck in multi_cpu_stop() with one cpu waiting for another that never
> happens.
>
> It _looks_ like the 'other' cpu isn't running and the current best
> theory is that we race on cpu-up and get the stop_two_cpus() call in
> before the stopper task is running.

How about this series? Slightly tested.

Note:

   - To me this also looks like a preparation for lg lock removal, no
     matter how exactly we will do this.

   - We can do more cleanups on top of this. Say remove preempt_disable
     in stop_two_cpus().

Oleg.

 include/linux/stop_machine.h |    1 
 kernel/cpu.c                 |    2 -
 kernel/stop_machine.c        |   83 +++++++++++++++++++++++++++++--------------
 3 files changed, 58 insertions(+), 28 deletions(-)

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