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[PATCH] HZ free ntp

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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>
This commit is contained in:
john stultz
2007-02-16 01:27:26 -08:00
committed by Linus Torvalds
parent 771ee3b04e
commit f4304ab215
4 changed files with 36 additions and 16 deletions
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11
kernel/hrtimer.c
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@ -128,15 +128,20 @@ EXPORT_SYMBOL_GPL(ktime_get_ts);
static void hrtimer_get_softirq_time(struct hrtimer_base *base)
{
ktime_t xtim, tomono;
struct timespec xts;
unsigned long seq;
do {
seq = read_seqbegin(&xtime_lock);
xtim = timespec_to_ktime(xtime);
tomono = timespec_to_ktime(wall_to_monotonic);
#ifdef CONFIG_NO_HZ
getnstimeofday(&xts);
#else
xts = xtime;
#endif
} while (read_seqretry(&xtime_lock, seq));
xtim = timespec_to_ktime(xts);
tomono = timespec_to_ktime(wall_to_monotonic);
base[CLOCK_REALTIME].softirq_time = xtim;
base[CLOCK_MONOTONIC].softirq_time = ktime_add(xtim, tomono);
}