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| author | john stultz <johnstul@us.ibm.com> | 2007-02-16 12:27:26 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 19:13:56 +0300 |
| commit | f4304ab21513b834c8fe3403927c60c2b81a72d7 (patch) | |
| tree | 212c8fa327d9cf3f29cccf172f0707a3eb6524f8 /include/linux/timex.h | |
| parent | 771ee3b04eaac6184312825eb600b4c598f027a5 (diff) | |
| download | linux-f4304ab21513b834c8fe3403927c60c2b81a72d7.tar.xz | |
[PATCH] HZ free ntp
Distangle the NTP update from HZ. This is necessary for dynamic tick enabled
kernels.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/timex.h')
| -rw-r--r-- | include/linux/timex.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h index 9a24e500c311..da929dbbea2a 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h @@ -286,6 +286,13 @@ static inline void time_interpolator_update(long delta_nsec) #define TICK_LENGTH_SHIFT 32 +#ifdef CONFIG_NO_HZ +#define NTP_INTERVAL_FREQ (2) +#else +#define NTP_INTERVAL_FREQ (HZ) +#endif +#define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ) + /* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */ extern u64 current_tick_length(void); |