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timekeeping: Prints the amounts of time spent during suspend

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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>
This commit is contained in:
Ruchi Kandoi 2016-08-11 14:35:01 -07:00 committed by John Stultz
parent 36374583f9
commit 0bf43f15db
1 changed files with 2 additions and 0 deletions
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2
kernel/time/timekeeping_debug.c
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@ -75,5 +75,7 @@ void tk_debug_account_sleep_time(struct timespec64 *t)
int bin = min(fls(t->tv_sec), NUM_BINS-1); int bin = min(fls(t->tv_sec), NUM_BINS-1);
sleep_time_bin[bin]++; sleep_time_bin[bin]++;
pr_info("Suspended for %lld.%03lu seconds\n", (s64)t->tv_sec,
t->tv_nsec / NSEC_PER_MSEC);
} }