From: Ingo Molnar Speedup hrtimer_enqueue by evaluating the rbtree insertion result. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- kernel/hrtimer.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) Index: linux-2.6.22-rc4-mm/kernel/hrtimer.c =================================================================== --- linux-2.6.22-rc4-mm.orig/kernel/hrtimer.c 2007-06-16 12:10:23.000000000 +0200 +++ linux-2.6.22-rc4-mm/kernel/hrtimer.c 2007-06-16 12:10:23.000000000 +0200 @@ -686,6 +686,7 @@ static void enqueue_hrtimer(struct hrtim 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 hrtim * 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 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/