linux-kernel - Re: [PATCH 2/3] nohz: Move idle balancer registration to idle path

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Message-ID: <1497980348.20270.104.camel@redhat.com>
Date:   Tue, 20 Jun 2017 13:39:08 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Frederic Weisbecker <fweisbec@...il.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 2/3] nohz: Move idle balancer registration to idle path

On Mon, 2017-06-19 at 04:12 +0200, Frederic Weisbecker wrote:
> The idle load balancing registration path assumes that we only stop
> the
> tick when the CPU is idle, ignoring the nohz full case. As a result,
> a
> nohz full CPU that is running a task may be chosen to perform idle
> load
> balancing.
> 
> Lets make sure that only CPUs in dynticks idle mode can be picked as
> idle load balancers.

Woah. Dang.

> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>

Acked-by: Rik van Riel <riel@...hat.com>

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