From: Zachary Amsden <[email protected]> Add a kernel call to get the number of nanoseconds since boot. This is generally useful enough to make it a generic call.
Signed-off-by: Zachary Amsden <[email protected]> Signed-off-by: Marcelo Tosatti <[email protected]> diff --git a/include/linux/time.h b/include/linux/time.h index ea3559f..5d04108 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -145,6 +145,7 @@ extern void getnstimeofday(struct timespec *tv); extern void getrawmonotonic(struct timespec *ts); extern void getboottime(struct timespec *ts); extern void monotonic_to_bootbased(struct timespec *ts); +extern s64 getnsboottime(void); extern struct timespec timespec_trunc(struct timespec t, unsigned gran); extern int timekeeping_valid_for_hres(void); diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index caf8d4d..d250f0a 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -285,6 +285,33 @@ void ktime_get_ts(struct timespec *ts) } EXPORT_SYMBOL_GPL(ktime_get_ts); + +/** + * getnsboottime - get the bootbased clock in nsec format + * + * The function calculates the bootbased clock from the realtime + * clock and the wall_to_monotonic offset and stores the result + * in normalized timespec format in the variable pointed to by @ts. + */ +s64 getnsboottime(void) +{ + unsigned int seq; + s64 secs, nsecs; + + WARN_ON(timekeeping_suspended); + + do { + seq = read_seqbegin(&xtime_lock); + secs = xtime.tv_sec + wall_to_monotonic.tv_sec; + secs += total_sleep_time.tv_sec; + nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec; + nsecs += total_sleep_time.tv_nsec + timekeeping_get_ns(); + + } while (read_seqretry(&xtime_lock, seq)); + return nsecs + (secs * NSEC_PER_SEC); +} +EXPORT_SYMBOL_GPL(getnsboottime); + /** * do_gettimeofday - Returns the time of day in a timeval * @tv: pointer to the timeval to be set -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
