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authorColin Cross <ccross@android.com>2013-05-21 22:32:14 -0700
committerJohn Stultz <john.stultz@linaro.org>2013-05-29 12:57:34 -0700
commit5c83545f24ab3dd67e0ae0e2b795fea750f08c34 (patch)
tree72ad0d3d33302a9100c17855bc08bf936cbdd081 /kernel/time/timekeeping_internal.h
parent11ffa9d6065f344a9bd769a2452f26f2f671e5f8 (diff)
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.h14
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 */