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PM / Sleep: add knob for printing device resume times

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Added a new knob called /sys/power/pm_print_times. Setting it to 1
enables printing of time taken by devices to suspend and resume.
Setting it to 0 disables this printing (unless overridden by
initcall_debug kernel command line option).

Signed-off-by: Sameer Nanda <snanda@chromium.org>
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Sameer Nanda
2012-06-19 22:23:33 +02:00
committed by Rafael J. Wysocki
parent 443772d408
commit 4b7760ba0d
4 changed files with 59 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/base/power/main.c
+2 -2
View File
@@ -166,7 +166,7 @@ static ktime_t initcall_debug_start(struct device *dev)
{
ktime_t calltime = ktime_set(0, 0);
if (initcall_debug) {
if (pm_print_times) {
pr_info("calling %s+ @ %i, parent: %s\n",
dev_name(dev), task_pid_nr(current),
dev->parent ? dev_name(dev->parent) : "none");
@@ -181,7 +181,7 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
{
ktime_t delta, rettime;
if (initcall_debug) {
if (pm_print_times) {
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
drivers/base/power/power.h
+11
View File
@@ -85,3 +85,14 @@ static inline int pm_qos_sysfs_add(struct device *dev) { return 0; }
static inline void pm_qos_sysfs_remove(struct device *dev) {}
#endif
#ifdef CONFIG_PM_DEBUG
extern int pm_print_times_enabled;
#define pm_print_times (initcall_debug || pm_print_times_enabled)
#else /* CONFIG_PM_DEBUG */
#define pm_print_times initcall_debug
#endif /* CONFIG_PM_DEBUG */