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sched: Add new API wake_up_if_idle() to wake up the idle cpu
Implementing one new API wake_up_if_idle(), which is used to wake up the idle CPU. Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: daniel.lezcano@linaro.org Cc: rjw@rjwysocki.net Cc: linux-pm@vger.kernel.org Cc: changcheng.liu@intel.com Cc: xiaoming.wang@intel.com Cc: souvik.k.chakravarty@intel.com Cc: chuansheng.liu@intel.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1409815075-4180-1-git-send-email-chuansheng.liu@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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2 changed files with 20 additions and 0 deletions
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@ -1024,6 +1024,7 @@ struct sched_domain_topology_level {
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extern struct sched_domain_topology_level *sched_domain_topology;
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extern void set_sched_topology(struct sched_domain_topology_level *tl);
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extern void wake_up_if_idle(int cpu);
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#ifdef CONFIG_SCHED_DEBUG
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# define SD_INIT_NAME(type) .name = #type
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@ -1634,6 +1634,25 @@ static void ttwu_queue_remote(struct task_struct *p, int cpu)
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}
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}
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void wake_up_if_idle(int cpu)
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{
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struct rq *rq = cpu_rq(cpu);
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unsigned long flags;
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if (!is_idle_task(rq->curr))
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return;
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if (set_nr_if_polling(rq->idle)) {
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trace_sched_wake_idle_without_ipi(cpu);
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} else {
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raw_spin_lock_irqsave(&rq->lock, flags);
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if (is_idle_task(rq->curr))
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smp_send_reschedule(cpu);
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/* Else cpu is not in idle, do nothing here */
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raw_spin_unlock_irqrestore(&rq->lock, flags);
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}
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}
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bool cpus_share_cache(int this_cpu, int that_cpu)
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{
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return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu);
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