nohz: Move idle balancer registration to the idle path
The idle load balancing registration path assumes that we only stop the tick when the CPU is idle, ignoring the nohz full case. As a result, a nohz full CPU that is running a task may be chosen to perform idle load balancing. Lets make sure that only CPUs in dynticks idle mode can be picked as idle load balancers. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1497838322-10913-3-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -782,7 +782,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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* the scheduler tick in nohz_restart_sched_tick.
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*/
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if (!ts->tick_stopped) {
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nohz_balance_enter_idle(cpu);
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calc_load_nohz_start();
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cpu_load_update_nohz_start();
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@ -923,8 +922,10 @@ static void __tick_nohz_idle_enter(struct tick_sched *ts)
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ts->idle_expires = expires;
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}
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if (!was_stopped && ts->tick_stopped)
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if (!was_stopped && ts->tick_stopped) {
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ts->idle_jiffies = ts->last_jiffies;
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nohz_balance_enter_idle(cpu);
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}
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}
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}
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