[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 <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

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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---

• References:
  • [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Dimitri Sivanich <[email protected]>
  • Re: [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Dimitri Sivanich <[email protected]>
  • Re: [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Eric Dumazet <[email protected]>
  • Re: [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Dimitri Sivanich <[email protected]>
  • Re: [PATCH] Call get_time() only when necessary in run_hrtimer_queue
    • From: Thomas Gleixner <[email protected]>

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