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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/process.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/process.c')
-rw-r--r--kernel/power/process.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 06ec8869dbf1..0ca8d83e2369 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -17,6 +17,7 @@
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/kmod.h>
+#include <trace/events/power.h>
/*
* Timeout for stopping processes
@@ -175,6 +176,7 @@ void thaw_processes(void)
struct task_struct *g, *p;
struct task_struct *curr = current;
+ trace_suspend_resume(TPS("thaw_processes"), 0, true);
if (pm_freezing)
atomic_dec(&system_freezing_cnt);
pm_freezing = false;
@@ -201,6 +203,7 @@ void thaw_processes(void)
schedule();
printk("done.\n");
+ trace_suspend_resume(TPS("thaw_processes"), 0, false);
}
void thaw_kernel_threads(void)