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Commit 99bc2fcb authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

hrtimer: speedup hrtimer_enqueue 



Speedup hrtimer_enqueue by evaluating the rbtree insertion result.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 820de5c3

kernel/hrtimer.c

+6 −4
Original line number Diff line number Diff line
@@ -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