From owner-p4-projects@FreeBSD.ORG  Fri Dec  2 21:22:34 2005
Return-Path: <owner-p4-projects@FreeBSD.ORG>
X-Original-To: p4-projects@freebsd.org
Delivered-To: p4-projects@freebsd.org
Received: by hub.freebsd.org (Postfix, from userid 32767)
	id 62E6316A422; Fri,  2 Dec 2005 21:22:34 +0000 (GMT)
X-Original-To: perforce@freebsd.org
Delivered-To: perforce@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 25A8A16A41F
	for <perforce@freebsd.org>; Fri,  2 Dec 2005 21:22:34 +0000 (GMT)
	(envelope-from jhb@freebsd.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E1CA443D58
	for <perforce@freebsd.org>; Fri,  2 Dec 2005 21:22:33 +0000 (GMT)
	(envelope-from jhb@freebsd.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id jB2LMXKv087916
	for <perforce@freebsd.org>; Fri, 2 Dec 2005 21:22:33 GMT
	(envelope-from jhb@freebsd.org)
Received: (from perforce@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id jB2LMXLl087913
	for perforce@freebsd.org; Fri, 2 Dec 2005 21:22:33 GMT
	(envelope-from jhb@freebsd.org)
Date: Fri, 2 Dec 2005 21:22:33 GMT
Message-Id: <200512022122.jB2LMXLl087913@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: perforce set sender to
	jhb@freebsd.org using -f
From: John Baldwin <jhb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Cc: 
Subject: PERFORCE change 87656 for review
X-BeenThere: p4-projects@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: p4 projects tree changes <p4-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/p4-projects>
List-Post: <mailto:p4-projects@freebsd.org>
List-Help: <mailto:p4-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 02 Dec 2005 21:22:35 -0000

http://perforce.freebsd.org/chv.cgi?CH=87656

Change 87656 by jhb@jhb_slimer on 2005/12/02 21:21:58

	Suggestion from Kris.

Affected files ...

.. //depot/projects/smpng/sys/notes#67 edit

Differences ...

==== //depot/projects/smpng/sys/notes#67 (text+ko) ====

@@ -75,6 +75,10 @@
     - arm, powerpc?
   - fork counts?
 - Add a cache-line padded mtx_aligned union and use it for the mutex pools.
+- Add a per-thread counter of the number of sleep mutexes held (including
+  recursion) and panic if we try to sleep with any held to provide a cheaper
+  version of the current WITNESS check that doesn't bog the system down quite
+  as bad.
 
 Active child branches:
 - jhb_intr - fast ithreads and MSI? (perhaps do MSI in jhb_acpipci)