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

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Date:   Wed, 31 Aug 2016 14:50:19 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Ruchi Kandoi <kandoiruchi@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Prarit Bhargava <prarit@...hat.com>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 3/6] timekeeping: Prints the amounts of time spent during suspend

From: Ruchi Kandoi <kandoiruchi@...gle.com>

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@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Signed-off-by: Ruchi Kandoi <kandoiruchi@...gle.com>
[jstultz: Tweaked commit message]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 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);
 
 	sleep_time_bin[bin]++;
+	pr_info("Suspended for %lld.%03lu seconds\n", (s64)t->tv_sec,
+			t->tv_nsec / NSEC_PER_MSEC);
 }
 
-- 
1.9.1