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

From	John Stultz <john.stultz@linaro.org>
Newsgroups	linux.kernel
Subject	[PATCH 3/6] timekeeping: Prints the amounts of time spent during suspend
Date	2016-09-01 00:00 +0200
Message-ID	<sclI6-7NG-37@gated-at.bofh.it> (permalink)
References	<sclI6-7NG-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

From: Ruchi Kandoi <kandoiruchi@google.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@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>
---
 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

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH 3/6] timekeeping: Prints the amounts of time spent during suspend John Stultz <john.stultz@linaro.org> - 2016-09-01 00:00 +0200

csiph-web