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Date: Tue, 11 Feb 2014 14:22:43 +0530
Message-ID: <CAKohpommw4=LcyYKvj8rNJgUkOT+_Gh=1kppcDQYm3BuQQe_Qg@mail.gmail.com>
Subject: Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?
From: Viresh Kumar <viresh.kumar@linaro.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lists linaro-kernel <linaro-kernel@lists.linaro.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Linaro Networking <linaro-networking@linaro.org>,
        Kevin Hilman <khilman@linaro.org>
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Sender: linux-kernel-owner@vger.kernel.org

On 28 January 2014 18:53, Frederic Weisbecker <fweisbec@gmail.com> wrote:
> No, when a single task is running on a full dynticks CPU, the tick is supposed to run
> every seconds. I'm actually suprised it doesn't happen in your traces, did you tweak
> something specific?

Why do we need this 1 second tick currently? And what will happen if I
hotunplug that
CPU and get it back? Would the timer for tick move away from CPU in
question? I see
that when I have changed this 1sec stuff to 300 seconds. But what
would be impact
of that? Will things still work normally?
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