svn commit: r229620 - stable/8/sys/kern

[John Baldwin]

Author: jhb
Date: Thu Jan  5 18:56:23 2012
New Revision: 229620
URL: http://svn.freebsd.org/changeset/base/229620

Log:
  MFC 228207:
  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.

Modified:
  stable/8/sys/kern/kern_resource.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/kern/kern_resource.c
==============================================================================
--- stable/8/sys/kern/kern_resource.c	Thu Jan  5 18:55:59 2012	(r229619)
+++ stable/8/sys/kern/kern_resource.c	Thu Jan  5 18:56:23 2012	(r229620)
@@ -497,8 +497,9 @@ 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) {
 		thread_unlock(td);
 		umtx_pi_adjust(td, oldpri);