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| author | Heena Sirwani <heenasirwani@gmail.com> | 2014-10-29 13:31:16 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-10-29 17:15:40 +0300 |
| commit | 9e3680b1750b9a62680b0262c9f438de98b77655 (patch) | |
| tree | 771803b021b50766f7fadb318db8230b514ac128 /include/linux | |
| parent | cac7f2429872d3733dc3f9915857b1691da2eb2f (diff) | |
| download | linux-9e3680b1750b9a62680b0262c9f438de98b77655.tar.xz | |
timekeeping: Provide fast accessor to the seconds part of CLOCK_MONOTONIC
This is the counterpart to get_seconds() based on CLOCK_MONOTONIC. The
use case for this interface are kernel internal coarse grained
timestamps which do neither require the nanoseconds fraction of
current time nor the CLOCK_REALTIME properties. Such timestamps can
currently only retrieved by calling ktime_get_ts64() and using the
tv_sec field of the returned timespec64. That's inefficient as it
involves the read of the clocksource, math operations and must be
protected by the timekeeper sequence counter.
To avoid the sequence counter protection we restrict the return value
to unsigned 32bit on 32bit machines. This covers ~136 years of uptime
and therefor an overflow is not expected to hit anytime soon.
To avoid math in the function we calculate the current seconds portion
of CLOCK_MONOTONIC when the timekeeper gets updated in
tk_update_ktime_data() similar to the CLOCK_REALTIME counterpart
xtime_sec.
[ tglx: Massaged changelog, simplified and commented the update
function, added docbook comment ]
Signed-off-by: Heena Sirwani <heenasirwani@gmail.com>
Reviewed-by: Arnd Bergman <arnd@arndb.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: opw-kernel@googlegroups.com
Link: http://lkml.kernel.org/r/da0b63f4bdf3478909f92becb35861197da3a905.1414578445.git.heenasirwani@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/timekeeper_internal.h | 2 | ||||
| -rw-r--r-- | include/linux/timekeeping.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h index 95640dcd1899..05af9a334893 100644 --- a/include/linux/timekeeper_internal.h +++ b/include/linux/timekeeper_internal.h @@ -42,6 +42,7 @@ struct tk_read_base { * struct timekeeper - Structure holding internal timekeeping values. * @tkr: The readout base structure * @xtime_sec: Current CLOCK_REALTIME time in seconds + * @ktime_sec: Current CLOCK_MONOTONIC time in seconds * @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset * @offs_real: Offset clock monotonic -> clock realtime * @offs_boot: Offset clock monotonic -> clock boottime @@ -77,6 +78,7 @@ struct tk_read_base { struct timekeeper { struct tk_read_base tkr; u64 xtime_sec; + unsigned long ktime_sec; struct timespec64 wall_to_monotonic; ktime_t offs_real; ktime_t offs_boot; diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 1caa6b04fdc5..115d55e11bc9 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -28,6 +28,7 @@ struct timespec __current_kernel_time(void); struct timespec get_monotonic_coarse(void); extern void getrawmonotonic(struct timespec *ts); extern void ktime_get_ts64(struct timespec64 *ts); +extern time64_t ktime_get_seconds(void); extern int __getnstimeofday64(struct timespec64 *tv); extern void getnstimeofday64(struct timespec64 *tv); |