From owner-cvs-src@FreeBSD.ORG  Mon Oct 17 23:10:32 2005
Return-Path: <owner-cvs-src@FreeBSD.ORG>
X-Original-To: cvs-src@FreeBSD.org
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3B24B16A41F;
	Mon, 17 Oct 2005 23:10:32 +0000 (GMT)
	(envelope-from davidxu@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E993143D46;
	Mon, 17 Oct 2005 23:10:31 +0000 (GMT)
	(envelope-from davidxu@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 j9HNAV6n013058;
	Mon, 17 Oct 2005 23:10:31 GMT
	(envelope-from davidxu@repoman.freebsd.org)
Received: (from davidxu@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id j9HNAVPL013057;
	Mon, 17 Oct 2005 23:10:31 GMT (envelope-from davidxu)
Message-Id: <200510172310.j9HNAVPL013057@repoman.freebsd.org>
From: David Xu <davidxu@FreeBSD.org>
Date: Mon, 17 Oct 2005 23:10:31 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/sys/amd64/amd64 cpu_switch.S machdep.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Oct 2005 23:10:32 -0000

davidxu     2005-10-17 23:10:31 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      cpu_switch.S machdep.c 
  Log:
  Micro optimization for context switch. Eliminate code for saving gs.base
  and fs.base. We always update pcb.pcb_gsbase and pcb.pcb_fsbase
  when user wants to set them, in context switch routine, we only need to
  write them into registers, we never have to read them out from registers
  when thread is switched away. Since rdmsr is a serialization instruction,
  micro benchmark shows it is worthy to do.
  
  Reviewed by: peter, jhb
  
  Revision  Changes    Path
  1.154     +0 -15     src/sys/amd64/amd64/cpu_switch.S
  1.642     +2 -0      src/sys/amd64/amd64/machdep.c