Commit f2511774 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Rafael J. Wysocki

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
......@@ -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;
}
......
......@@ -149,6 +149,8 @@ void prepare_namespace(void);
extern void (*late_time_init)(void);
extern int initcall_debug;
#endif
#ifndef MODULE
......
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