suspend: add initcall_debug style timing for suspend/resume

Commit Message

Arjan van de Ven Dec. 6, 2009, 8:35 p.m. UTC

None

Patch

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 8aa2443..2ad345c 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -25,6 +25,7 @@ 
 #include <linux/resume-trace.h>
 #include <linux/rwsem.h>
 #include <linux/interrupt.h>
+#include <linux/sched.h>
 
 #include "../base.h"
 #include "power.h"
@@ -172,6 +173,12 @@  static int pm_op(struct device *dev,
 		 pm_message_t state)
 {
 	int error = 0;
+	ktime_t calltime, delta, rettime;
+
+	if (initcall_debug) {
+		printk("calling  %s+ @ %i\n", dev_name(dev), task_pid_nr(current));
+		calltime = ktime_get();
+	}
 
 	switch (state.event) {
 #ifdef CONFIG_SUSPEND
@@ -219,6 +226,14 @@  static int pm_op(struct device *dev,
 	default:
 		error = -EINVAL;
 	}
+
+	if (initcall_debug) {
+		rettime = ktime_get();
+		delta = ktime_sub(rettime, calltime);
+		printk("initcall %s+ returned %d after %Ld usecs\n", dev_name(dev),
+			error, (unsigned long long) ktime_to_ns(delta) >> 10);
+	}
+
 	return error;
 }
 
@@ -236,6 +251,12 @@  static int pm_noirq_op(struct device *dev,
 			pm_message_t state)
 {
 	int error = 0;
+	ktime_t calltime, delta, rettime;
+
+	if (initcall_debug) {
+		printk("calling  %s_i+ @ %i\n", dev_name(dev), task_pid_nr(current));
+		calltime = ktime_get();
+	}
 
 	switch (state.event) {
 #ifdef CONFIG_SUSPEND
@@ -283,6 +304,14 @@  static int pm_noirq_op(struct device *dev,
 	default:
 		error = -EINVAL;
 	}
+
+	if (initcall_debug) {
+		rettime = ktime_get();
+		delta = ktime_sub(rettime, calltime);
+		printk("initcall %s_i+ returned %d after %Ld usecs\n", dev_name(dev),
+			error, (unsigned long long) ktime_to_ns(delta) >> 10);
+	}
+
 	return error;
 }
 
diff --git a/include/linux/init.h b/include/linux/init.h
index ff8bde5..ab1d31f 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -149,6 +149,8 @@  void prepare_namespace(void);
 
 extern void (*late_time_init)(void);
 
+extern int initcall_debug;
+
 #endif
   
 #ifndef MODULE