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Date: Mon, 14 Apr 2014 15:18:30 +0530
Message-ID: <CAM4v1pOWQFNaoc44b+7=hrYEzwiMMnhVFZnqfJEZiECuiquuEQ@mail.gmail.com>
Subject: Re: [Query]: tick-sched: why don't we stop tick when we are running
 idle task?
From: Preeti Murthy <preeti.lkml@gmail.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lists linaro-kernel <linaro-kernel@lists.linaro.org>,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>
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Sender: linux-kernel-owner@vger.kernel.org

Hi Viresh,

I am not too sure about the complexity or the worthiness of this patch but
just wanted to add that care must be taken to migrate the tick_sched_timer
of all the remote CPUs off a hotplugged out CPU if the latter was keeping
their time thus far. In the normal scenario I am guessing the tick_sched_timer
dies along with the hotplugged out CPU since there is no need for it any more.

Regards
Preeti U Murthy
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