path: root/kernel/cpu.c
diff options
authorTodd E Brandt <todd.e.brandt@linux.intel.com>2014-06-06 05:40:17 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-06-07 00:18:07 +0200
commitbb3632c6101b2fad07e6246721466b984b1e0e9d (patch)
tree1f5755a94c7dfe2b2051411e0f08620b398a9059 /kernel/cpu.c
parent3eba148d75670f61463dd3c9ef8672da8f290f36 (diff)
PM / sleep: trace events for suspend/resume
Adds trace events that give finer resolution into suspend/resume. These events are graphed in the timelines generated by the analyze_suspend.py script. They represent large areas of time consumed that are typical to suspend and resume. The event is triggered by calling the function "trace_suspend_resume" with three arguments: a string (the name of the event to be displayed in the timeline), an integer (case specific number, such as the power state or cpu number), and a boolean (where true is used to denote the start of the timeline event, and false to denote the end). The suspend_resume trace event reproduces the data that the machine_suspend trace event did, so the latter has been removed. Signed-off-by: Todd Brandt <todd.e.brandt@intel.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/cpu.c')
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index a9e710eef0e2..76deba01322a 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -20,6 +20,7 @@
#include <linux/gfp.h>
#include <linux/suspend.h>
#include <linux/lockdep.h>
+#include <trace/events/power.h>
#include "smpboot.h"
@@ -522,7 +523,9 @@ int disable_nonboot_cpus(void)
for_each_online_cpu(cpu) {
if (cpu == first_cpu)
+ trace_suspend_resume(TPS("CPU_OFF"), cpu, true);
error = _cpu_down(cpu, 1);
+ trace_suspend_resume(TPS("CPU_OFF"), cpu, false);
if (!error)
cpumask_set_cpu(cpu, frozen_cpus);
else {
@@ -566,7 +569,9 @@ void __ref enable_nonboot_cpus(void)
for_each_cpu(cpu, frozen_cpus) {
+ trace_suspend_resume(TPS("CPU_ON"), cpu, true);
error = _cpu_up(cpu, 1);
+ trace_suspend_resume(TPS("CPU_ON"), cpu, false);
if (!error) {
printk(KERN_INFO "CPU%d is up\n", cpu);

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