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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-23 09:57:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-23 09:57:16 -0700
commitb14ea38e13686799b9d2545d467a0ec84732981c (patch)
tree0decf621cf4a56eb9c1a2426edb7399bebb4a2e4 /kernel
parent6770ab5cf506f0f00c17a5f063c5506bdc1eb170 (diff)
parentc4bd822e7b12a9008241d76db45b665f2fef180c (diff)
downloadlinux-linaro-b14ea38e13686799b9d2545d467a0ec84732981c.tar.gz
Merge branch 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: NOHZ: fix thinko in the timer restart code path
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-sched.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0581c11fe6c..727c1ae0517 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -567,11 +567,21 @@ static void tick_nohz_switch_to_nohz(void)
static void tick_nohz_kick_tick(int cpu)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ ktime_t delta, now;
if (!ts->tick_stopped)
return;
- tick_nohz_restart(ts, ktime_get());
+ /*
+ * Do not touch the tick device, when the next expiry is either
+ * already reached or less/equal than the tick period.
+ */
+ now = ktime_get();
+ delta = ktime_sub(ts->sched_timer.expires, now);
+ if (delta.tv64 <= tick_period.tv64)
+ return;
+
+ tick_nohz_restart(ts, now);
}
#else