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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>
This commit is contained in:
Frederic Weisbecker 2017-06-19 04:12:01 +02:00 committed by Ingo Molnar
parent 3c85d6db5e
commit a0db971e4e
1 changed files with 3 additions and 2 deletions
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5
kernel/time/tick-sched.c
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@ -782,7 +782,6 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
* the scheduler tick in nohz_restart_sched_tick. * the scheduler tick in nohz_restart_sched_tick.
*/ */
if (!ts->tick_stopped) { if (!ts->tick_stopped) {
nohz_balance_enter_idle(cpu);
calc_load_nohz_start(); calc_load_nohz_start();
cpu_load_update_nohz_start(); cpu_load_update_nohz_start();
@ -923,8 +922,10 @@ static void __tick_nohz_idle_enter(struct tick_sched *ts)
ts->idle_expires = expires; ts->idle_expires = expires;
} }
if (!was_stopped && ts->tick_stopped) if (!was_stopped && ts->tick_stopped) {
ts->idle_jiffies = ts->last_jiffies; ts->idle_jiffies = ts->last_jiffies;
nohz_balance_enter_idle(cpu);
}
} }
} }