From owner-freebsd-current@FreeBSD.ORG  Fri Aug 18 08:15:57 2006
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: current@freebsd.org
Delivered-To: freebsd-current@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3282B16A4DA
	for <current@freebsd.org>; Fri, 18 Aug 2006 08:15:57 +0000 (UTC)
	(envelope-from xdivac02@stud.fit.vutbr.cz)
Received: from eva.fit.vutbr.cz (eva.fit.vutbr.cz [147.229.10.14])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 789B343D49
	for <current@freebsd.org>; Fri, 18 Aug 2006 08:15:53 +0000 (GMT)
	(envelope-from xdivac02@stud.fit.vutbr.cz)
Received: from eva.fit.vutbr.cz (localhost [127.0.0.1])
	by eva.fit.vutbr.cz (envelope-from xdivac02@eva.fit.vutbr.cz)
	(8.13.7/8.13.7) with ESMTP id k7I8FlMT040788
	(version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO);
	Fri, 18 Aug 2006 10:15:47 +0200 (CEST)
Received: (from xdivac02@localhost)
	by eva.fit.vutbr.cz (8.13.7/8.13.3/Submit) id k7I8FlAB040787;
	Fri, 18 Aug 2006 10:15:47 +0200 (CEST)
Date: Fri, 18 Aug 2006 10:15:47 +0200
From: Divacky Roman <xdivac02@stud.fit.vutbr.cz>
To: Peter Jeremy <peterjeremy@optushome.com.au>
Message-ID: <20060818081546.GA40569@stud.fit.vutbr.cz>
References: <20060816132539.owwerbnw0okwc8wo@netchild.homeip.net>
	<20060817080533.GA845@turion.vk2pj.dyndns.org>
	<20060817122534.e57aqlbrwwogg8ko@netchild.homeip.net>
	<44E4454B.2080606@elischer.org>
	<20060817133721.h4cbucizcw8wc88k@netchild.homeip.net>
	<20060817140122.GA90642@stud.fit.vutbr.cz>
	<44E4881A.3050907@elischer.org>
	<20060817164352.GB96801@stud.fit.vutbr.cz>
	<2fd864e0608171556o6af3e1fdxa29c252f07c98444@mail.gmail.com>
	<20060818080607.GA732@turion.vk2pj.dyndns.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20060818080607.GA732@turion.vk2pj.dyndns.org>
User-Agent: Mutt/1.4.2i
X-Scanned-By: MIMEDefang 2.54 on 147.229.10.14
Cc: Astrodog <astrodog@gmail.com>, current@freebsd.org
Subject: Re: HEADS-UP: starting to commit linuxolator (SoC 2006) changes...
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 18 Aug 2006 08:15:57 -0000

> IMHO, it is cleaner to explicitly delete it once it becomes non-functional.
> Having dead code lying around just slows down compilation and misleads
> people into thinking that it is functional.  If someone wants to resurrect
> it at a later date, they can always retrieve it from the Attic.

what makes 2.6 and 2.4 incompatible is the way they treat "pid". in 2.4 times
pid is something unique to a process, ie. you cannot have two processes with the
same pid. in 2.6 this changed pid is number processes can share and now tid is
used as "unique identifier of a process".

netchild commited patch which lets this happen and it makes getpid/getppid/exit_group
quite expensive (I have to retrieve osrelease for a given jail and compare the string).