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From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 6 Jan 2011 22:19:15 +0000 (UTC)
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Subject: svn commit: r217077 - head/sys/kern
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Author: jhb
Date: Thu Jan  6 22:19:15 2011
New Revision: 217077
URL: http://svn.freebsd.org/changeset/base/217077

Log:
  Only change the priority of timeshare threads to PRI_MAX_TIMESHARE
  when yield() is called.  Specifically, leave the priority of real time
  and idle threads unchanged.
  
  MFC after:	2 weeks

Modified:
  head/sys/kern/kern_synch.c

Modified: head/sys/kern/kern_synch.c
==============================================================================
--- head/sys/kern/kern_synch.c	Thu Jan  6 22:17:07 2011	(r217076)
+++ head/sys/kern/kern_synch.c	Thu Jan  6 22:19:15 2011	(r217077)
@@ -546,7 +546,8 @@ yield(struct thread *td, struct yield_ar
 {
 
 	thread_lock(td);
-	sched_prio(td, PRI_MAX_TIMESHARE);
+	if (PRI_BASE(td->td_pri_class) == PRI_TIMESHARE)
+		sched_prio(td, PRI_MAX_TIMESHARE);
 	mi_switch(SW_VOL | SWT_RELINQUISH, NULL);
 	thread_unlock(td);
 	td->td_retval[0] = 0;