Messages in this thread Patch in this message | | | From | Mark Salyzyn <> | Subject | PM / Suspend: Print wall time at suspend entry and exit | Date | Mon, 5 Jun 2017 12:31:14 -0700 |
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Permits power state and battery life diagnosis.
Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Mark Salyzyn <salyzyn@android.com> --- kernel/power/suspend.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index c0248c74d6d4..464175f04bc5 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -26,6 +26,7 @@ #include <linux/suspend.h> #include <linux/syscore_ops.h> #include <linux/ftrace.h> +#include <linux/rtc.h> #include <trace/events/power.h> #include <linux/compiler.h> #include <linux/moduleparam.h> @@ -563,6 +564,18 @@ static int enter_state(suspend_state_t state) return error; } +static void pm_suspend_marker(char *annotation) +{ + struct timespec ts; + struct rtc_time tm; + + getnstimeofday(&ts); + rtc_time_to_tm(ts.tv_sec, &tm); + pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n", + annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); +} + /** * pm_suspend - Externally visible function for suspending the system. * @state: System sleep state to enter. @@ -577,6 +590,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + pm_suspend_marker("entry"); error = enter_state(state); if (error) { suspend_stats.fail++; @@ -584,6 +598,7 @@ int pm_suspend(suspend_state_t state) } else { suspend_stats.success++; } + pm_suspend_marker("exit"); return error; } EXPORT_SYMBOL(pm_suspend); -- 2.13.0.506.g27d5fe0cd-goog
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