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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-05-10 01:23:35 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-05-15 00:26:06 +0200
commit75e0678e7095c486a1b39ea560f8eb51a2714d6d (patch)
tree6bd6e984c893388fe2dae27c9f7ae2fffc4a2e42 /kernel/time
parent819b1bb30d2fb1b3a2b8016e83f02dfc85ada1e0 (diff)
downloadop-kernel-dev-75e0678e7095c486a1b39ea560f8eb51a2714d6d.zip
op-kernel-dev-75e0678e7095c486a1b39ea560f8eb51a2714d6d.tar.gz
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: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-common.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 3ae6afa..80c0430 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -19,6 +19,7 @@
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/module.h>
+#include <trace/events/power.h>
#include <asm/irq_regs.h>
@@ -457,10 +458,13 @@ void tick_freeze(void)
raw_spin_lock(&tick_freeze_lock);
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();
- else
+ } else {
tick_suspend_local();
+ }
raw_spin_unlock(&tick_freeze_lock);
}
@@ -478,10 +482,13 @@ void tick_unfreeze(void)
{
raw_spin_lock(&tick_freeze_lock);
- if (tick_freeze_depth == num_online_cpus())
+ if (tick_freeze_depth == num_online_cpus()) {
timekeeping_resume();
- else
+ trace_suspend_resume(TPS("timekeeping_freeze"),
+ smp_processor_id(), false);
+ } else {
tick_resume_local();
+ }
tick_freeze_depth--;
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