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PM / Wakeup: Introduce wakeup source objects and event statistics (v3)

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Introduce struct wakeup_source for representing system wakeup sources
within the kernel and for collecting statistics related to them.
Make the recently introduced helper functions pm_wakeup_event(),
pm_stay_awake() and pm_relax() use struct wakeup_source objects
internally, so that wakeup statistics associated with wakeup devices
can be collected and reported in a consistent way (the definition of
pm_relax() is changed, which is harmless, because this function is
not called directly by anyone yet).  Introduce new wakeup-related
sysfs device attributes in /sys/devices/.../power for reporting the
device wakeup statistics.

Change the global wakeup events counters event_count and
events_in_progress into atomic variables, so that it is not necessary
to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake()
and pm_relax(), which should allow us to avoid lock contention in
these functions on SMP systems with many wakeup devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki 2010-09-22 22:09:10 +02:00
parent 0702d9ee0f
commit 074037ec79
10 changed files with 762 additions and 131 deletions
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8
kernel/power/main.c
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@ -237,18 +237,18 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
unsigned long val;
unsigned int val;
return pm_get_wakeup_count(&val) ? sprintf(buf, "%lu\n", val) : -EINTR;
return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR;
}
static ssize_t wakeup_count_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned long val;
unsigned int val;
if (sscanf(buf, "%lu", &val) == 1) {
if (sscanf(buf, "%u", &val) == 1) {
if (pm_save_wakeup_count(val))
return n;
}