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Subject[PATCH] Call get_softirq_time() only when necessary in run_hrtimer_queue()
It seems that run_hrtimer_queue() is calling get_softirq_time() more
often than it needs to.

With this patch, it only calls get_softirq_time() if there's a
pending timer.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Index: linux/kernel/hrtimer.c
===================================================================
--- linux.orig/kernel/hrtimer.c 2006-03-28 11:46:45.279722496 -0600
+++ linux/kernel/hrtimer.c 2006-03-28 11:51:36.722469752 -0600
@@ -606,6 +606,9 @@ static inline void run_hrtimer_queue(str
{
struct rb_node *node;

+ if (!base->first)
+ return;
+
if (base->get_softirq_time)
base->softirq_time = base->get_softirq_time();

-
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