diff options
author | jinqian <jinqian@google.com> | 2015-03-25 16:18:44 -0700 |
---|---|---|
committer | jinqian <jinqian@google.com> | 2015-04-09 11:42:30 -0700 |
commit | e7d473583da732196bb9119f0ab32dfb59025c09 (patch) | |
tree | c4a5474d60671f8f70a1aaa5a9d33b891803826f /kernel | |
parent | 33ba72c7c74c98206ce3ec74b14f0354d8505ae8 (diff) |
Power: Report suspend times from last_suspend_time
This node epxorts two values separated by space.
From left to right:
1. time spent in suspend/resume process
2. time spent sleep in suspend state
Change-Id: I2cb9a9408a5fd12166aaec11b935a0fd6a408c63
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/power/wakeup_reason.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/kernel/power/wakeup_reason.c b/kernel/power/wakeup_reason.c index 085c99edca06..76b53400cb16 100644 --- a/kernel/power/wakeup_reason.c +++ b/kernel/power/wakeup_reason.c @@ -36,6 +36,11 @@ static char abort_reason[MAX_SUSPEND_ABORT_LEN]; static struct kobject *wakeup_reason; static DEFINE_SPINLOCK(resume_reason_lock); +static struct timespec last_xtime; /* wall time before last suspend */ +static struct timespec curr_xtime; /* wall time after last suspend */ +static struct timespec last_stime; /* total_sleep_time before last suspend */ +static struct timespec curr_stime; /* total_sleep_time after last suspend */ + static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -59,10 +64,32 @@ static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribu return buf_offset; } +static ssize_t last_suspend_time_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct timespec sleep_time; + struct timespec total_time; + struct timespec suspend_resume_time; + + sleep_time = timespec_sub(curr_stime, last_stime); + total_time = timespec_sub(curr_xtime, last_xtime); + suspend_resume_time = timespec_sub(total_time, sleep_time); + + /* + * suspend_resume_time is calculated from sleep_time. Userspace would + * always need both. Export them in pair here. + */ + return sprintf(buf, "%lu.%09lu %lu.%09lu\n", + suspend_resume_time.tv_sec, suspend_resume_time.tv_nsec, + sleep_time.tv_sec, sleep_time.tv_nsec); +} + static struct kobj_attribute resume_reason = __ATTR_RO(last_resume_reason); +static struct kobj_attribute suspend_time = __ATTR_RO(last_suspend_time); static struct attribute *attrs[] = { &resume_reason.attr, + &suspend_time.attr, NULL, }; static struct attribute_group attr_group = { @@ -133,12 +160,21 @@ void log_suspend_abort_reason(const char *fmt, ...) static int wakeup_reason_pm_event(struct notifier_block *notifier, unsigned long pm_event, void *unused) { + struct timespec xtom; /* wall_to_monotonic, ignored */ + switch (pm_event) { case PM_SUSPEND_PREPARE: spin_lock(&resume_reason_lock); irqcount = 0; suspend_abort = false; spin_unlock(&resume_reason_lock); + + get_xtime_and_monotonic_and_sleep_offset(&last_xtime, &xtom, + &last_stime); + break; + case PM_POST_SUSPEND: + get_xtime_and_monotonic_and_sleep_offset(&curr_xtime, &xtom, + &curr_stime); break; default: break; |