tree 5488a9508a8767e248aab6029f623e7e9dfbb224
parent b5e995e671d8e4d7a75b339ce78ecc586014b0eb
author Viresh Kumar <viresh.kumar@linaro.org> 1402570481 +0530
committer Frederic Weisbecker <frederic@kernel.org> 1408726055 +0200

nohz: Avoid tick's double reprogramming in highres mode

In highres mode, the tick reschedules itself unconditionally to the
next jiffies.

However while this clock reprogramming is relevant when the tick is
in periodic mode, it's not that interesting when we run in dynticks mode
because irq exit is likely going to overwrite the next tick to some
randomly deferred future.

So lets just get rid of this tick self rescheduling in dynticks mode.
This way we can avoid some clockevents double write in favourable
scenarios like when we stop the tick completely in idle while no other
hrtimer is pending.

Suggested-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>