[PATCH 3/6] timekeeping: Prints the amounts of time spent during suspend

From: John Stultz
Date: Wed Aug 31 2016 - 17:50:40 EST

From: Ruchi Kandoi <kandoiruchi@xxxxxxxxxx>

In addition to keeping a histogram of suspend times, also
print out the time spent in suspend to dmesg.

This helps to keep track of suspend time while debugging using
kernel logs.

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Signed-off-by: Ruchi Kandoi <kandoiruchi@xxxxxxxxxx>
[jstultz: Tweaked commit message]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
kernel/time/timekeeping_debug.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 107310a6..ca9fb80 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -75,5 +75,7 @@ void tk_debug_account_sleep_time(struct timespec64 *t)
int bin = min(fls(t->tv_sec), NUM_BINS-1);

+ pr_info("Suspended for %lld.%03lu seconds\n", (s64)t->tv_sec,
+ t->tv_nsec / NSEC_PER_MSEC);