cpuidle: Use wake_up_all_idle_cpus() to wake up all idle cpus
Currently kick_all_cpus_sync() or smp_call_function() can not break the polling idle cpu immediately. Instead using wake_up_all_idle_cpus() which can wake up the polling idle cpu quickly is much more helpful for power. Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: linux-pm@vger.kernel.org Cc: changcheng.liu@intel.com Cc: xiaoming.wang@intel.com Cc: souvik.k.chakravarty@intel.com Cc: luto@amacapital.net Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Link: http://lkml.kernel.org/r/1409815075-4180-3-git-send-email-chuansheng.liu@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -223,7 +223,7 @@ void cpuidle_uninstall_idle_handler(void)
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{
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if (enabled_devices) {
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initialized = 0;
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kick_all_cpus_sync();
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wake_up_all_idle_cpus();
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}
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}
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@ -530,11 +530,6 @@ EXPORT_SYMBOL_GPL(cpuidle_register);
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#ifdef CONFIG_SMP
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static void smp_callback(void *v)
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{
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/* we already woke the CPU up, nothing more to do */
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}
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/*
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* This function gets called when a part of the kernel has a new latency
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* requirement. This means we need to get all processors out of their C-state,
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@ -544,7 +539,7 @@ static void smp_callback(void *v)
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static int cpuidle_latency_notify(struct notifier_block *b,
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unsigned long l, void *v)
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{
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smp_call_function(smp_callback, NULL, 1);
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wake_up_all_idle_cpus();
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return NOTIFY_OK;
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}
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