From: Dimitri Sivanich <sivanich@sgi.com>
Date: Fri, 31 Mar 2006 10:31:20 +0000 (-0800)
Subject: [PATCH] hrtimer: call get_softirq_time() only when necessary in run_hrtimer_queue()
X-Git-Tag: v2.6.17-rc1~60
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3055addadbe9bfb2365006a1c13fd342a8d30d52;p=linux-2.6

[PATCH] hrtimer: 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 49cbf7cffe..f181ff4dd3 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -606,6 +606,9 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
 {
 	struct rb_node *node;
 
+	if (!base->first)
+		return;
+
 	if (base->get_softirq_time)
 		base->softirq_time = base->get_softirq_time();