From owner-cvs-src@FreeBSD.ORG  Tue Jun 17 20:54:53 2008
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id ACDF8106564A;
	Tue, 17 Jun 2008 20:54:53 +0000 (UTC)
	(envelope-from sobomax@FreeBSD.org)
Received: from sippysoft.com (gk1.360sip.com [72.236.70.240])
	by mx1.freebsd.org (Postfix) with ESMTP id 69C3B8FC15;
	Tue, 17 Jun 2008 20:54:53 +0000 (UTC)
	(envelope-from sobomax@FreeBSD.org)
Received: from [192.168.0.40] ([204.244.149.125]) (authenticated bits=0)
	by sippysoft.com (8.13.8/8.13.8) with ESMTP id m5HKsWh9032647
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 17 Jun 2008 13:54:34 -0700 (PDT)
	(envelope-from sobomax@FreeBSD.org)
Message-ID: <48582484.3040606@FreeBSD.org>
Date: Tue, 17 Jun 2008 13:54:28 -0700
From: Maxim Sobolev <sobomax@FreeBSD.org>
Organization: Sippy Software, Inc.
User-Agent: Thunderbird 2.0.0.14 (Windows/20080421)
MIME-Version: 1.0
To: John Baldwin <jhb@FreeBSD.org>
References: <200806170633.m5H6XMJH084600@repoman.freebsd.org>
	<20080617140600.GE1176@hoeg.nl> <4857D508.8070907@FreeBSD.org>
	<200806171122.41340.jhb@freebsd.org>
In-Reply-To: <200806171122.41340.jhb@freebsd.org>
Content-Type: text/plain; charset=KOI8-U; format=flowed
Content-Transfer-Encoding: 7bit
Cc: Ed Schouten <ed@80386.nl>, src-committers@FreeBSD.org,
	David Xu <davidxu@FreeBSD.org>, cvs-all@FreeBSD.org, cvs-src@FreeBSD.org
Subject: Re: cvs commit: src/include Makefile spawn.h unistd.h
 src/lib/libc/gen Makefile.inc Symbol.map exec.3 exec.c posix_spawn.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: Tue, 17 Jun 2008 20:54:53 -0000

John Baldwin wrote:
> On Tuesday 17 June 2008 11:15:20 am Maxim Sobolev wrote:
>> Ed Schouten wrote:
>>> * David Schultz <das@FreeBSD.ORG> wrote:
>>>> I have no objections to this, but doesn't it defeat the whole
>>>> purpose to implement posix_spawn() as a library function that just
>>>> calls fork/exec?
>>> When (if?) applications start to use posix_spawn() we may decide to move
>>> it into the kernel at any time. It should be okay for now.
>> Are there any benefits of doing it in the kernel vs. doing it via fork+exec?
> 
> Speed.  You don't have to go mark all your pages as COW or some such only to 
> turn around and throw the new mappings away and undo that.

Don't we have vfork() for that?

-Maxim