svn commit: r297481 - head/sys/kern

[Mateusz Guzik]

Author: mjg
Date: Wed Apr  1 08:10:00 2016
New Revision: 280963
URL: https://svnweb.freebsd.org/changeset/base/297481

Log:
  Increase responsiveness under load by being more aggressive with
  priority changes.

  MFC after:	1 week

Modified:
  head/sys/kern/sched_ule.c

Modified: head/sys/kern/sched_ule.c
===================================================================
--- sys/kern/sched_ule.c	(revision 297480)
+++ sys/kern/sched_ule.c	(working copy)
@@ -1696,15 +1696,10 @@
 	} 
 	ts = td->td_sched;
 	THREAD_LOCK_ASSERT(td, MA_OWNED);
-	if (td->td_priority == prio)
-		return;
 	/*
-	 * If the priority has been elevated due to priority
-	 * propagation, we may have to move ourselves to a new
-	 * queue.  This could be optimized to not re-add in some
-	 * cases.
+	 * DOES THIS WORK LOL
 	 */
-	if (TD_ON_RUNQ(td) && prio < td->td_priority) {
+	if (TD_ON_RUNQ(td) && prio != td->td_priority) {
 		sched_rem(td);
 		td->td_priority = prio;
 		sched_add(td, SRQ_BORROWING);