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Commit f2511774 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Rafael J. Wysocki
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PM: Add initcall_debug style timing for suspend/resume 



In order to diagnose overall suspend/resume times, we need
basic instrumentation to break down the total time into per
device timing, similar to initcall_debug.

This patch adds the basic timing instrumentation, needed
for a scritps/bootgraph.pl equivalent or humans.
The bootgraph.pl program is still a work in progress, but
is far enough along to know that this patch is sufficient.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 1d531c14

drivers/base/power/main.c

+31 −0
Original line number Diff line number Diff line
@@ -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 +173,13 @@ static int pm_op(struct device *dev, 
		 pm_message_t state)

{

	int error = 0;

	ktime_t calltime, delta, rettime;



	if (initcall_debug) {

		pr_info("calling  %s+ @ %i\n",

				dev_name(dev), task_pid_nr(current));

		calltime = ktime_get();

	}



	switch (state.event) {

#ifdef CONFIG_SUSPEND
@@ -219,6 +227,14 @@ static int pm_op(struct device *dev, 
	default:

		error = -EINVAL;

	}



	if (initcall_debug) {

		rettime = ktime_get();

		delta = ktime_sub(rettime, calltime);

		pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),

			error, (unsigned long long)ktime_to_ns(delta) >> 10);

	}



	return error;

}
@@ -236,6 +252,13 @@ static int pm_noirq_op(struct device *dev, 
			pm_message_t state)

{

	int error = 0;

	ktime_t calltime, delta, rettime;



	if (initcall_debug) {

		pr_info("calling  %s_i+ @ %i\n",

				dev_name(dev), task_pid_nr(current));

		calltime = ktime_get();

	}



	switch (state.event) {

#ifdef CONFIG_SUSPEND
@@ -283,6 +306,14 @@ 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;

}

include/linux/init.h

+2 −0
Original line number Diff line number Diff line
@@ -149,6 +149,8 @@ void prepare_namespace(void); 


extern void (*late_time_init)(void);



extern int initcall_debug;



#endif

  

#ifndef MODULE