Commit 59449359 authored May 27, 2015 by Frederic Weisbecker

nohz: Remove idle task special case



On nohz full early days, idle dynticks and full dynticks weren't well
integrated and we couldn't risk full dynticks calls on idle without
risking messing up tick idle statistics. This is why we prevented such
thing to happen.

Nowadays full dynticks and idle dynticks are better integrated and
interact without known issue.

So lets remove that.

Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

parent 03f6199a

kernel/time/tick-sched.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -208,12 +208,10 @@ void __tick_nohz_full_check(void)
		struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);

		if (tick_nohz_full_cpu(smp_processor_id())) {
		if (ts->tick_stopped && !is_idle_task(current)) {
		if (!can_stop_full_tick())
		if (ts->tick_stopped && !can_stop_full_tick())
		tick_nohz_restart_sched_tick(ts, ktime_get());
		}
		}
		}

		static void nohz_full_kick_work_func(struct irq_work *work)
		{
		@@ -710,7 +708,7 @@ static void tick_nohz_full_stop_tick(struct tick_sched *ts)
		#ifdef CONFIG_NO_HZ_FULL
		int cpu = smp_processor_id();

		if (!tick_nohz_full_cpu(cpu) \|\| is_idle_task(current))
		if (!tick_nohz_full_cpu(cpu))
		return;

		if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)

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