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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>
This commit is contained in:
Frederic Weisbecker 2015-05-27 15:42:42 +02:00
parent 03f6199a35
commit 5944935943
1 changed files with 3 additions and 5 deletions
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8
kernel/time/tick-sched.c
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@ -208,10 +208,8 @@ 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())
tick_nohz_restart_sched_tick(ts, ktime_get());
}
if (ts->tick_stopped && !can_stop_full_tick())
tick_nohz_restart_sched_tick(ts, ktime_get());
}
}
@ -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)