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authorjohn stultz <johnstul@us.ibm.com>2007-02-16 01:27:26 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:56 -0800
commitf4304ab21513b834c8fe3403927c60c2b81a72d7 (patch)
tree212c8fa327d9cf3f29cccf172f0707a3eb6524f8 /include/linux/timex.h
parent771ee3b04eaac6184312825eb600b4c598f027a5 (diff)
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op-kernel-dev-f4304ab21513b834c8fe3403927c60c2b81a72d7.tar.gz
[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.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h
index 9a24e50..da929db 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);
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