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authorLinus Torvalds <torvalds@linux-foundation.org>2008-07-15 10:39:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-15 10:39:57 -0700
commitda6e88f4963385b1b649b043691d206fbb951913 (patch)
tree779a1a6cf04dad09dee0828ad4ece0927de1b5f3 /kernel/time/tick-sched.c
parent61d97f4fcf73d30864a52373a34093be25be6a03 (diff)
parent7dc9719682ce8c46215bc9a1bdc7ee0c38ada94b (diff)
downloadblackbird-op-linux-da6e88f4963385b1b649b043691d206fbb951913.tar.gz
blackbird-op-linux-da6e88f4963385b1b649b043691d206fbb951913.zip
Merge branch 'timers/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: add PCI ID for 6300ESB force hpet x86: add another PCI ID for ICH6 force-hpet kernel-paramaters: document pmtmr= command line option acpi_pm clccksource: fix printk format warning nohz: don't stop idle tick if softirqs are pending. pmtmr: allow command line override of ioport nohz: reduce jiffies polling overhead hrtimer: Remove unused variables in ktime_divns() hrtimer: remove warning in hres_timers_resume posix-timers: print RT watchdog message
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r--kernel/time/tick-sched.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d63008b09a4c..beef7ccdf842 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -48,6 +48,13 @@ static void tick_do_update_jiffies64(ktime_t now)
unsigned long ticks = 0;
ktime_t delta;
+ /*
+ * Do a quick check without holding xtime_lock:
+ */
+ delta = ktime_sub(now, last_jiffies_update);
+ if (delta.tv64 < tick_period.tv64)
+ return;
+
/* Reevalute with xtime_lock held */
write_seqlock(&xtime_lock);
@@ -228,6 +235,7 @@ void tick_nohz_stop_sched_tick(void)
local_softirq_pending());
ratelimit++;
}
+ goto end;
}
ts->idle_calls++;
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