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PM: Add initcall_debug style timing for suspend/resume

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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: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Arjan van de Ven 2009-12-13 20:29:01 +01:00 committed by Rafael J. Wysocki
parent 1d531c14d2
commit f251177486
2 changed files with 33 additions and 0 deletions
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31
drivers/base/power/main.c
View file

@ -25,6 +25,7 @@
#include <linux/resume-trace.h> #include <linux/resume-trace.h>
#include <linux/rwsem.h> #include <linux/rwsem.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/sched.h>
#include "../base.h" #include "../base.h"
#include "power.h" #include "power.h"
@ -172,6 +173,13 @@ static int pm_op(struct device *dev,
pm_message_t state) pm_message_t state)
{ {
int error = 0; 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) { switch (state.event) {
#ifdef CONFIG_SUSPEND #ifdef CONFIG_SUSPEND
@ -219,6 +227,14 @@ static int pm_op(struct device *dev,
default: default:
error = -EINVAL; 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; return error;
} }
@ -236,6 +252,13 @@ static int pm_noirq_op(struct device *dev,
pm_message_t state) pm_message_t state)
{ {
int error = 0; 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) { switch (state.event) {
#ifdef CONFIG_SUSPEND #ifdef CONFIG_SUSPEND
@ -283,6 +306,14 @@ static int pm_noirq_op(struct device *dev,
default: default:
error = -EINVAL; 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; return error;
} }

2
include/linux/init.h
View file

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