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| author | Colin Cross <ccross@android.com> | 2013-05-21 22:32:14 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2013-05-29 12:57:34 -0700 |
| commit | 5c83545f24ab3dd67e0ae0e2b795fea750f08c34 (patch) | |
| tree | 72ad0d3d33302a9100c17855bc08bf936cbdd081 /kernel/time/timekeeping_internal.h | |
| parent | 11ffa9d6065f344a9bd769a2452f26f2f671e5f8 (diff) | |
| download | lwn-5c83545f24ab3dd67e0ae0e2b795fea750f08c34.tar.gz lwn-5c83545f24ab3dd67e0ae0e2b795fea750f08c34.zip | |
power: Add option to log time spent in suspend
Below is a patch from android kernel that maintains a histogram of
suspend times. Please review and provide feedback.
Statistices on the time spent in suspend are kept in
/sys/kernel/debug/sleep_time.
Cc: Android Kernel Team <kernel-team@android.com>
Cc: Colin Cross <ccross@android.com>
Cc: Todd Poynor <toddpoynor@google.com>
Cc: San Mehat <san@google.com>
Cc: Benoit Goby <benoit@android.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
[zoran.markovic@linaro.org: Re-formatted suspend time table to better
fit expected values. Moved accounting of suspend time into timekeeping
core. Removed CONFIG_SUSPEND_TIME flag and made the feature conditional
on CONFIG_DEBUG_FS. Changed the file name to sleep_time to better fit
terminology in timekeeping core. Changed seq_printf to seq_puts. Tweaked
commit message]
Signed-off-by: Zoran Markovic <zoran.markovic@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time/timekeeping_internal.h')
| -rw-r--r-- | kernel/time/timekeeping_internal.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/time/timekeeping_internal.h b/kernel/time/timekeeping_internal.h new file mode 100644 index 000000000000..13323ea08ffa --- /dev/null +++ b/kernel/time/timekeeping_internal.h @@ -0,0 +1,14 @@ +#ifndef _TIMEKEEPING_INTERNAL_H +#define _TIMEKEEPING_INTERNAL_H +/* + * timekeeping debug functions + */ +#include <linux/time.h> + +#ifdef CONFIG_DEBUG_FS +extern void tk_debug_account_sleep_time(struct timespec *t); +#else +#define tk_debug_account_sleep_time(x) +#endif + +#endif /* _TIMEKEEPING_INTERNAL_H */ |