From owner-svn-src-stable@FreeBSD.ORG  Fri Jan 13 20:25:57 2012
Return-Path: <owner-svn-src-stable@FreeBSD.ORG>
Delivered-To: svn-src-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 17695106564A;
	Fri, 13 Jan 2012 20:25:57 +0000 (UTC) (envelope-from jhb@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 028398FC15;
	Fri, 13 Jan 2012 20:25:57 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q0DKPuc2079059;
	Fri, 13 Jan 2012 20:25:56 GMT (envelope-from jhb@svn.freebsd.org)
Received: (from jhb@localhost)
	by svn.freebsd.org (8.14.4/8.14.4/Submit) id q0DKPuVn079057;
	Fri, 13 Jan 2012 20:25:56 GMT (envelope-from jhb@svn.freebsd.org)
Message-Id: <201201132025.q0DKPuVn079057@svn.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 13 Jan 2012 20:25:56 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org
X-SVN-Group: stable-8
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r230084 - stable/8/sys/kern
X-BeenThere: svn-src-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for all the -stable branches of the src tree
	<svn-src-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-stable>, 
	<mailto:svn-src-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-stable>
List-Post: <mailto:svn-src-stable@freebsd.org>
List-Help: <mailto:svn-src-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-stable>,
	<mailto:svn-src-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 13 Jan 2012 20:25:57 -0000

Author: jhb
Date: Fri Jan 13 20:25:56 2012
New Revision: 230084
URL: http://svn.freebsd.org/changeset/base/230084

Log:
  MFC 228960:
  Cap the priority calculated from the current thread's running tick count
  at SCHED_PRI_RANGE to prevent overflows in the priority value.  This can
  happen due to irregularities with clock interrupts under certain
  virtualization environments.

Modified:
  stable/8/sys/kern/sched_ule.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/sched_ule.c
==============================================================================
--- stable/8/sys/kern/sched_ule.c	Fri Jan 13 20:25:38 2012	(r230083)
+++ stable/8/sys/kern/sched_ule.c	Fri Jan 13 20:25:56 2012	(r230084)
@@ -1426,7 +1426,8 @@ sched_priority(struct thread *td)
 	} else {
 		pri = SCHED_PRI_MIN;
 		if (td->td_sched->ts_ticks)
-			pri += SCHED_PRI_TICKS(td->td_sched);
+			pri += min(SCHED_PRI_TICKS(td->td_sched),
+			    SCHED_PRI_RANGE);
 		pri += SCHED_PRI_NICE(td->td_proc->p_nice);
 		KASSERT(pri >= PRI_MIN_BATCH && pri <= PRI_MAX_BATCH,
 		    ("sched_priority: invalid priority %d: nice %d, "