Fix_sched_balance_pair_comment_and_move_lock
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	harrison-astrodog.net
	Feb 26 2015, 11:45 AM

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Fix_sched_balance_pair_comment_and_move_lock
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	Index: sys/kern/sched_ule.c
	===================================================================
	--- sys/kern/sched_ule.c (revision 278968)
	+++ sys/kern/sched_ule.c (working copy)
	@@ -908,15 +909,21 @@
	{
	int moved;
	int cpu;
	-
	+
	+ /*
	+ * Don't bother to lock if balancing doesn't make sense.
	+ */
	+
	+ if (high->tdq_load <= low->tdq_load)
	+ return(0);
	+
	tdq_lock_pair(high, low);
	moved = 0;
	/*
	- * Determine what the imbalance is and then adjust that to how many
	- * threads we actually have to give up (transferable).
	+ * Move one thread from high to low if high has at least 1
	+ * transferable thread.
	*/
	- if (high->tdq_transferable != 0 && high->tdq_load > low->tdq_load &&
	- (moved = tdq_move(high, low)) > 0) {
	+ if (high->tdq_transferable == 0 && (moved = tdq_move(high, low)) > 0) {
	/*
	* In case the target isn't the current cpu IPI it to force a
	* reschedule with the new workload.