diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 20 | ||||
| -rw-r--r-- | kernel/timer.c | 12 |
2 files changed, 25 insertions, 7 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 849deb9..e91ee58 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -587,7 +587,7 @@ unlock: * account when the CPU goes back to idle and evaluates the timer * wheel for the next timer event. */ -void wake_up_idle_cpu(int cpu) +static void wake_up_idle_cpu(int cpu) { struct rq *rq = cpu_rq(cpu); @@ -617,6 +617,24 @@ void wake_up_idle_cpu(int cpu) smp_send_reschedule(cpu); } +static bool wake_up_extended_nohz_cpu(int cpu) +{ + if (tick_nohz_extended_cpu(cpu)) { + if (cpu != smp_processor_id() || + tick_nohz_tick_stopped()) + smp_send_reschedule(cpu); + return true; + } + + return false; +} + +void wake_up_nohz_cpu(int cpu) +{ + if (!wake_up_extended_nohz_cpu(cpu)) + wake_up_idle_cpu(cpu); +} + static inline bool got_nohz_idle_kick(void) { int cpu = smp_processor_id(); diff --git a/kernel/timer.c b/kernel/timer.c index dbf7a78..4e3040b 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -930,14 +930,14 @@ void add_timer_on(struct timer_list *timer, int cpu) debug_activate(timer, timer->expires); internal_add_timer(base, timer); /* - * Check whether the other CPU is idle and needs to be - * triggered to reevaluate the timer wheel when nohz is - * active. We are protected against the other CPU fiddling + * Check whether the other CPU is in dynticks mode and needs + * to be triggered to reevaluate the timer wheel. + * We are protected against the other CPU fiddling * with the timer by holding the timer base lock. This also - * makes sure that a CPU on the way to idle can not evaluate - * the timer wheel. + * makes sure that a CPU on the way to stop its tick can not + * evaluate the timer wheel. */ - wake_up_idle_cpu(cpu); + wake_up_nohz_cpu(cpu); spin_unlock_irqrestore(&base->lock, flags); } EXPORT_SYMBOL_GPL(add_timer_on); |
