From owner-cvs-src@FreeBSD.ORG  Fri Jul 23 14:11:04 2004
Return-Path: <owner-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 A758C16A4CE; Fri, 23 Jul 2004 14:11:04 +0000 (GMT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 89B7843D1D; Fri, 23 Jul 2004 14:11:04 +0000 (GMT)
	(envelope-from rwatson@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.12.11/8.12.11) with ESMTP id i6NEB4wd044805;
	Fri, 23 Jul 2004 14:11:04 GMT
	(envelope-from rwatson@repoman.freebsd.org)
Received: (from rwatson@localhost)
	by repoman.freebsd.org (8.12.11/8.12.11/Submit) id i6NEB4M9044804;
	Fri, 23 Jul 2004 14:11:04 GMT
	(envelope-from rwatson)
Message-Id: <200407231411.i6NEB4M9044804@repoman.freebsd.org>
From: Robert Watson <rwatson@FreeBSD.org>
Date: Fri, 23 Jul 2004 14:11:04 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/kern sys_pipe.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 23 Jul 2004 14:11:04 -0000

rwatson     2004-07-23 14:11:04 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             sys_pipe.c 
  Log:
  Don't perform pipe endpoint locking during pipe_create(), as the pipe
  can't yet be referenced by other threads.
  
  In microbenchmarks, this appears to reduce the cost of
  pipe();close();close() on UP by 10%, and SMP by 7%.  The vast majority
  of the cost of allocating a pipe remains VM magic.
  
  Suggested by:   silby
  
  Revision  Changes    Path
  1.173     +20 -11    src/sys/kern/sys_pipe.c