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authorIngo Molnar <mingo@elte.hu>2007-07-21 04:37:36 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 17:49:15 -0700
commit99bc2fcb283852931fb6bbef40f3df8316b59000 (patch)
tree98419250c75a78578cdf32391fa03b013d635056 /kernel
parent820de5c39ef7f6866d2c9e6c7d208bcd2a6e1942 (diff)
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hrtimer: speedup hrtimer_enqueue
Speedup hrtimer_enqueue by evaluating the rbtree insertion result. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/hrtimer.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 065a8978662..eb1ddebd2c0 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -686,6 +686,7 @@ static void enqueue_hrtimer(struct hrtimer *timer,
struct rb_node **link = &base->active.rb_node;
struct rb_node *parent = NULL;
struct hrtimer *entry;
+ int leftmost = 1;
/*
* Find the right place in the rbtree:
@@ -697,18 +698,19 @@ static void enqueue_hrtimer(struct hrtimer *timer,
* We dont care about collisions. Nodes with
* the same expiry time stay together.
*/
- if (timer->expires.tv64 < entry->expires.tv64)
+ if (timer->expires.tv64 < entry->expires.tv64) {
link = &(*link)->rb_left;
- else
+ } else {
link = &(*link)->rb_right;
+ leftmost = 0;
+ }
}
/*
* Insert the timer to the rbtree and check whether it
* replaces the first pending timer
*/
- if (!base->first || timer->expires.tv64 <
- rb_entry(base->first, struct hrtimer, node)->expires.tv64) {
+ if (leftmost) {
/*
* Reprogram the clock event device. When the timer is already
* expired hrtimer_enqueue_reprogram has either called the