From: Ruchi Kandoi <kandoiruchi@google.com>
Date: Thu, 11 Aug 2016 21:35:01 +0000 (-0700)
Subject: timekeeping: Prints the amounts of time spent during suspend
X-Git-Tag: v4.9-rc1~152^2~17
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0bf43f15db857e83daf4134aa062c8b157a80ee0;p=karo-tx-linux.git

timekeeping: Prints the amounts of time spent during suspend

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@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
[jstultz: Tweaked commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---

diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 107310a6f36f..ca9fb800336b 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);
 
 	sleep_time_bin[bin]++;
+	pr_info("Suspended for %lld.%03lu seconds\n", (s64)t->tv_sec,
+			t->tv_nsec / NSEC_PER_MSEC);
 }