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Commit 75e0678e authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / tick: Add tracepoints for suspend-to-idle diagnostics 



Add suspend/resume tracepoints to tick_freeze() and tick_unfreeze()
to catch when timekeeping is suspended and resumed during suspend-to-idle
so as to be able to check whether or not we enter the "frozen" state
and to measure the time spent in it.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 819b1bb3

kernel/time/tick-common.c

+11 −4
Original line number Original line Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/profile.h>

#include <linux/profile.h>

#include <linux/sched.h>

#include <linux/sched.h>

#include <linux/module.h>

#include <linux/module.h>

#include <trace/events/power.h>





#include <asm/irq_regs.h>

#include <asm/irq_regs.h>
@@ -457,10 +458,13 @@ void tick_freeze(void) 
	raw_spin_lock(&tick_freeze_lock);

	raw_spin_lock(&tick_freeze_lock);





	tick_freeze_depth++;

	tick_freeze_depth++;

	if (tick_freeze_depth == num_online_cpus())

	if (tick_freeze_depth == num_online_cpus()) {

		trace_suspend_resume(TPS("timekeeping_freeze"),

				     smp_processor_id(), true);

		timekeeping_suspend();

		timekeeping_suspend();

	else

	} else {

		tick_suspend_local();

		tick_suspend_local();

	}





	raw_spin_unlock(&tick_freeze_lock);

	raw_spin_unlock(&tick_freeze_lock);

}

}
@@ -478,10 +482,13 @@ void tick_unfreeze(void) 
{

{

	raw_spin_lock(&tick_freeze_lock);

	raw_spin_lock(&tick_freeze_lock);





	if (tick_freeze_depth == num_online_cpus())

	if (tick_freeze_depth == num_online_cpus()) {

		timekeeping_resume();

		timekeeping_resume();

	else

		trace_suspend_resume(TPS("timekeeping_freeze"),

				     smp_processor_id(), false);

	} else {

		tick_resume_local();

		tick_resume_local();

	}





	tick_freeze_depth--;

	tick_freeze_depth--;