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PM: Allow wakeup events to abort freezing of tasks

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If there is a wakeup event during the freezing of tasks, suspend or
hibernation will fail anyway.  Since try_to_freeze_tasks() can take
up to 20 seconds to complete or fail, aborting it as soon as a wakeup
event is detected improves the worst case wakeup latency.

Based on a patch from Arve Hjønnevåg.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Rafael J. Wysocki 2010-10-04 22:07:32 +02:00
parent 5fc62aad4e
commit dbeeec5fe8
2 changed files with 11 additions and 2 deletions
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2
include/linux/suspend.h
View file

@ -308,6 +308,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
}
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
static inline bool pm_check_wakeup_events(void) { return true; }
#endif /* !CONFIG_PM_SLEEP */
extern struct mutex pm_mutex;

11
kernel/power/process.c
View file

@ -40,6 +40,7 @@ static int try_to_freeze_tasks(bool sig_only)
struct timeval start, end;
u64 elapsed_csecs64;
unsigned int elapsed_csecs;
bool wakeup = false;
do_gettimeofday(&start);
@ -78,6 +79,11 @@ static int try_to_freeze_tasks(bool sig_only)
if (!todo || time_after(jiffies, end_time))
break;
if (!pm_check_wakeup_events()) {
wakeup = true;
break;
}
/*
* We need to retry, but first give the freezing tasks some
* time to enter the regrigerator.
@ -97,8 +103,9 @@ static int try_to_freeze_tasks(bool sig_only)
* but it cleans up leftover PF_FREEZE requests.
*/
printk("\n");
printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
"(%d tasks refusing to freeze, wq_busy=%d):\n",
wakeup ? "aborted" : "failed",
elapsed_csecs / 100, elapsed_csecs % 100,
todo - wq_busy, wq_busy);
@ -107,7 +114,7 @@ static int try_to_freeze_tasks(bool sig_only)
read_lock(&tasklist_lock);
do_each_thread(g, p) {
task_lock(p);
if (freezing(p) && !freezer_should_skip(p))
if (!wakeup && freezing(p) && !freezer_should_skip(p))
sched_show_task(p);
cancel_freezing(p);
task_unlock(p);