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Commit 2ed903c5 authored by Chuansheng Liu's avatar Chuansheng Liu Committed by Ingo Molnar
Browse files

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: default avatarChuansheng Liu <chuansheng.liu@intel.com>
Signed-off-by: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent c6f4459f

drivers/cpuidle/cpuidle.c

+2 −7
Original line number Original line Diff line number Diff line
@@ -223,7 +223,7 @@ void cpuidle_uninstall_idle_handler(void) 
{

{

	if (enabled_devices) {

	if (enabled_devices) {

		initialized = 0;

		initialized = 0;

		kick_all_cpus_sync();

		wake_up_all_idle_cpus();

	}

	}

}

}
@@ -530,11 +530,6 @@ EXPORT_SYMBOL_GPL(cpuidle_register); 




#ifdef CONFIG_SMP

#ifdef CONFIG_SMP





static void smp_callback(void *v)

{

	/* we already woke the CPU up, nothing more to do */

}



/*

/*

 * This function gets called when a part of the kernel has a new latency

 * This function gets called when a part of the kernel has a new latency

 * requirement.  This means we need to get all processors out of their C-state,

 * requirement.  This means we need to get all processors out of their C-state,
@@ -544,7 +539,7 @@ static void smp_callback(void *v) 
static int cpuidle_latency_notify(struct notifier_block *b,

static int cpuidle_latency_notify(struct notifier_block *b,

		unsigned long l, void *v)

		unsigned long l, void *v)

{

{

	smp_call_function(smp_callback, NULL, 1);

	wake_up_all_idle_cpus();

	return NOTIFY_OK;

	return NOTIFY_OK;

}

}