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authorTodd E Brandt <todd.e.brandt@linux.intel.com>2014-06-06 16:40:17 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-06-07 02:18:07 +0400
commitbb3632c6101b2fad07e6246721466b984b1e0e9d (patch)
tree1f5755a94c7dfe2b2051411e0f08620b398a9059 /kernel/power/hibernate.c
parent3eba148d75670f61463dd3c9ef8672da8f290f36 (diff)
downloadlinux-bb3632c6101b2fad07e6246721466b984b1e0e9d.tar.xz
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/power/hibernate.c')
-rw-r--r--kernel/power/hibernate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index df88d55dc436..49e0a20fd010 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -28,6 +28,7 @@
#include <linux/syscore_ops.h>
#include <linux/ctype.h>
#include <linux/genhd.h>
+#include <trace/events/power.h>
#include "power.h"
@@ -292,7 +293,9 @@ static int create_image(int platform_mode)
in_suspend = 1;
save_processor_state();
+ trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
error = swsusp_arch_suspend();
+ trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
if (error)
printk(KERN_ERR "PM: Error %d creating hibernation image\n",
error);