Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758707Ab1BPEUc (ORCPT ); Tue, 15 Feb 2011 23:20:32 -0500 Received: from e33.co.us.ibm.com ([32.97.110.151]:33464 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757664Ab1BPEUP (ORCPT ); Tue, 15 Feb 2011 23:20:15 -0500 From: John Stultz To: LKML Cc: John Stultz , Jamie Lokier , Thomas Gleixner , Alexander Shishkin , =?UTF-8?q?Arve=20Hj=C3=83=C2=B8nnev=C3=83=C2=A5g?= Subject: [PATCH 2/5] time: Introduce get_monotonic_boottime and ktime_get_boottime Date: Tue, 15 Feb 2011 20:20:04 -0800 Message-Id: <1297830007-426-3-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.7.3.2.146.gca209 In-Reply-To: <1297830007-426-1-git-send-email-john.stultz@linaro.org> References: <1297830007-426-1-git-send-email-john.stultz@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3774 Lines: 115 This adds new functions that return the monotonic time since boot (in other words, CLOCK_MONOTONIC + suspend time). CC: Jamie Lokier CC: Thomas Gleixner CC: Alexander Shishkin CC: Arve Hjønnevåg Signed-off-by: John Stultz --- include/linux/hrtimer.h | 1 + include/linux/time.h | 1 + kernel/time/timekeeping.c | 51 ++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 52 insertions(+), 1 deletions(-) diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 20b8e66..7a9e7ee 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -312,6 +312,7 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer) extern ktime_t ktime_get(void); extern ktime_t ktime_get_real(void); +extern ktime_t ktime_get_boottime(void); DECLARE_PER_CPU(struct tick_device, tick_cpu_device); diff --git a/include/linux/time.h b/include/linux/time.h index 379b903..fa39150 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -161,6 +161,7 @@ extern void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real); extern void getboottime(struct timespec *ts); extern void monotonic_to_bootbased(struct timespec *ts); +extern void get_monotonic_boottime(struct timespec *ts); 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 6262c1d..5fbd9aa 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -907,7 +907,7 @@ static void update_wall_time(void) * getboottime - Return the real time of system boot. * @ts: pointer to the timespec to be set * - * Returns the time of day in a timespec. + * Returns the wall-time of boot in a timespec. * * This is based on the wall_to_monotonic offset and the total suspend * time. Calls to settimeofday will affect the value returned (which @@ -925,6 +925,55 @@ void getboottime(struct timespec *ts) } EXPORT_SYMBOL_GPL(getboottime); + +/** + * get_monotonic_boottime - Returns monotonic time since boot + * @ts: pointer to the timespec to be set + * + * Returns the monotonic time since boot in a timespec. + * + * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also + * includes the time spent in suspend. + */ +void get_monotonic_boottime(struct timespec *ts) +{ + struct timespec tomono, sleep; + unsigned int seq; + s64 nsecs; + + WARN_ON(timekeeping_suspended); + + do { + seq = read_seqbegin(&xtime_lock); + *ts = xtime; + tomono = wall_to_monotonic; + sleep = total_sleep_time; + nsecs = timekeeping_get_ns(); + + } while (read_seqretry(&xtime_lock, seq)); + + set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec, + ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs); +} +EXPORT_SYMBOL_GPL(get_monotonic_boottime); + +/** + * ktime_get_boottime - Returns monotonic time since boot in a ktime + * + * Returns the monotonic time since boot in a ktime + * + * This is similar to CLOCK_MONTONIC/ktime_get, but also + * includes the time spent in suspend. + */ +ktime_t ktime_get_boottime(void) +{ + struct timespec ts; + + get_monotonic_boottime(&ts); + return timespec_to_ktime(ts); +} +EXPORT_SYMBOL_GPL(ktime_get_boottime); + /** * monotonic_to_bootbased - Convert the monotonic time to boot based. * @ts: pointer to the timespec to be converted -- 1.7.3.2.146.gca209 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/