svn commit: r228207 - head/sys/kern

[John Baldwin]

Author: jhb
Date: Fri Dec  2 19:59:46 2011
New Revision: 228207
URL: http://svn.freebsd.org/changeset/base/228207

Log:
  When changing the user priority of a thread, change the real priority
  in addition to the user priority for threads whose current real priority
  is equal to the previous user priority or if the new priority is a
  real-time priority.  This allows priority changes of other threads to
  have an immediate effect.
  
  MFC after:	2 weeks

Modified:
  head/sys/kern/kern_resource.c

Modified: head/sys/kern/kern_resource.c
==============================================================================
--- head/sys/kern/kern_resource.c	Fri Dec  2 19:56:46 2011	(r228206)
+++ head/sys/kern/kern_resource.c	Fri Dec  2 19:59:46 2011	(r228207)
@@ -488,8 +488,9 @@ rtp_to_pri(struct rtprio *rtp, struct th
 	sched_class(td, rtp->type);	/* XXX fix */
 	oldpri = td->td_user_pri;
 	sched_user_prio(td, newpri);
-	if (curthread == td)
-		sched_prio(curthread, td->td_user_pri); /* XXX dubious */
+	if (td->td_user_pri != oldpri && (td == curthread ||
+	    td->td_priority == oldpri || td->td_user_pri >= PRI_MAX_REALTIME))
+		sched_prio(td, td->td_user_pri);
 	if (TD_ON_UPILOCK(td) && oldpri != newpri) {
 		critical_enter();
 		thread_unlock(td);