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hrtimer: speedup hrtimer_enqueue

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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>
This commit is contained in:
Ingo Molnar 2007-07-21 04:37:36 -07:00 committed by Linus Torvalds
parent 820de5c39e
commit 99bc2fcb28
1 changed files with 6 additions and 4 deletions
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10
kernel/hrtimer.c
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@ -686,6 +686,7 @@ static void enqueue_hrtimer(struct hrtimer *timer,
struct rb_node **link = &base->active.rb_node; struct rb_node **link = &base->active.rb_node;
struct rb_node *parent = NULL; struct rb_node *parent = NULL;
struct hrtimer *entry; struct hrtimer *entry;
int leftmost = 1;
/* /*
* Find the right place in the rbtree: * 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 * We dont care about collisions. Nodes with
* the same expiry time stay together. * the same expiry time stay together.
*/ */
if (timer->expires.tv64 < entry->expires.tv64) if (timer->expires.tv64 < entry->expires.tv64) {
link = &(*link)->rb_left; link = &(*link)->rb_left;
else } else {
link = &(*link)->rb_right; link = &(*link)->rb_right;
leftmost = 0;
}
} }
/* /*
* Insert the timer to the rbtree and check whether it * Insert the timer to the rbtree and check whether it
* replaces the first pending timer * replaces the first pending timer
*/ */
if (!base->first || timer->expires.tv64 < if (leftmost) {
rb_entry(base->first, struct hrtimer, node)->expires.tv64) {
/* /*
* Reprogram the clock event device. When the timer is already * Reprogram the clock event device. When the timer is already
* expired hrtimer_enqueue_reprogram has either called the * expired hrtimer_enqueue_reprogram has either called the