From owner-svn-src-all@FreeBSD.ORG  Fri Sep 30 20:23:18 2011
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C6AC4106566B;
	Fri, 30 Sep 2011 20:23:18 +0000 (UTC)
	(envelope-from marius@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id B67FE8FC15;
	Fri, 30 Sep 2011 20:23:18 +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 p8UKNIiC085307;
	Fri, 30 Sep 2011 20:23:18 GMT (envelope-from marius@svn.freebsd.org)
Received: (from marius@localhost)
	by svn.freebsd.org (8.14.4/8.14.4/Submit) id p8UKNIvp085305;
	Fri, 30 Sep 2011 20:23:18 GMT (envelope-from marius@svn.freebsd.org)
Message-Id: <201109302023.p8UKNIvp085305@svn.freebsd.org>
From: Marius Strobl <marius@FreeBSD.org>
Date: Fri, 30 Sep 2011 20:23:18 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r225888 - head/sys/sparc64/sparc64
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 30 Sep 2011 20:23:18 -0000

Author: marius
Date: Fri Sep 30 20:23:18 2011
New Revision: 225888
URL: http://svn.freebsd.org/changeset/base/225888

Log:
  Add a comment about why contrary to what once would think running all of
  userland with total store order actually is appropriate.

Modified:
  head/sys/sparc64/sparc64/machdep.c

Modified: head/sys/sparc64/sparc64/machdep.c
==============================================================================
--- head/sys/sparc64/sparc64/machdep.c	Fri Sep 30 20:13:51 2011	(r225887)
+++ head/sys/sparc64/sparc64/machdep.c	Fri Sep 30 20:23:18 2011	(r225888)
@@ -1015,6 +1015,10 @@ exec_setregs(struct thread *td, struct i
 	tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
 	tf->tf_tnpc = imgp->entry_addr + 4;
 	tf->tf_tpc = imgp->entry_addr;
+	/*
+	 * While we could adhere to the memory model indicated in the ELF
+	 * header, it turns out that just always using TSO performs best.
+	 */
 	tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
 
 	td->td_retval[0] = tf->tf_out[0];