Permits power state and battery life diagnosis. Since one is not guaranteed to have a persistent hardware clock to report Suspended for in milliseconds, we report at a higher level at just the entry and exit points for suspend and hibernate.
Feature activated by CONFIG_RTC_SHOW_TIME_* Signed-off-by: Mark Salyzyn <[email protected]> v2: - merge suspend and hibernate into a single patch --- kernel/power/hibernate.c | 4 +++- kernel/power/suspend.c | 3 +++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index e1914c7b85b1..0b5460f9189b 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -32,11 +32,11 @@ #include <linux/ctype.h> #include <linux/genhd.h> #include <linux/ktime.h> +#include <linux/rtc.h> #include <trace/events/power.h> #include "power.h" - static int nocompress; static int noresume; static int nohibernate; @@ -342,6 +342,7 @@ int hibernation_snapshot(int platform_mode) pm_message_t msg; int error; + rtc_show_time("PM: hibernation entry"); pm_suspend_clear_flags(); error = platform_begin(platform_mode); if (error) @@ -409,6 +410,7 @@ int hibernation_snapshot(int platform_mode) thaw_kernel_threads(); Cleanup: swsusp_free(); + rtc_show_time("PM: hibernation exit"); goto Close; } diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 3ecf275d7e44..f44d2152ab3f 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> @@ -579,6 +580,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + rtc_show_time("PM: suspend entry"); error = enter_state(state); if (error) { suspend_stats.fail++; @@ -586,6 +588,7 @@ int pm_suspend(suspend_state_t state) } else { suspend_stats.success++; } + rtc_show_time("PM: suspend exit"); return error; } EXPORT_SYMBOL(pm_suspend); -- 2.14.0.rc0.284.gd933b75aa4-goog
