From owner-svn-src-projects@FreeBSD.ORG  Sun Jun 20 17:51:47 2010
Return-Path: <owner-svn-src-projects@FreeBSD.ORG>
Delivered-To: svn-src-projects@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 08CD9106566B
	for <svn-src-projects@freebsd.org>;
	Sun, 20 Jun 2010 17:51:47 +0000 (UTC) (envelope-from alc@cs.rice.edu)
Received: from mail.cs.rice.edu (mail.cs.rice.edu [128.42.1.31])
	by mx1.freebsd.org (Postfix) with ESMTP id D682C8FC1E
	for <svn-src-projects@freebsd.org>;
	Sun, 20 Jun 2010 17:51:46 +0000 (UTC)
Received: from mail.cs.rice.edu (localhost.localdomain [127.0.0.1])
	by mail.cs.rice.edu (Postfix) with ESMTP id B6B652C2A91;
	Sun, 20 Jun 2010 12:30:02 -0500 (CDT)
X-Virus-Scanned: by amavis-2.4.0 at mail.cs.rice.edu
Received: from mail.cs.rice.edu ([127.0.0.1])
	by mail.cs.rice.edu (mail.cs.rice.edu [127.0.0.1]) (amavisd-new,
	port 10024)
	with LMTP id pHZxjHrMYDhI; Sun, 20 Jun 2010 12:29:55 -0500 (CDT)
Received: from adsl-216-63-78-18.dsl.hstntx.swbell.net
	(adsl-216-63-78-18.dsl.hstntx.swbell.net [216.63.78.18])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by mail.cs.rice.edu (Postfix) with ESMTP id CB72D2C2A8C;
	Sun, 20 Jun 2010 12:29:54 -0500 (CDT)
Message-ID: <4C1E5011.1030509@cs.rice.edu>
Date: Sun, 20 Jun 2010 12:29:53 -0500
From: Alan Cox <alc@cs.rice.edu>
User-Agent: Thunderbird 2.0.0.24 (X11/20100501)
MIME-Version: 1.0
To: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
References: <201006152146.o5FLk79o002713@svn.freebsd.org>
In-Reply-To: <201006152146.o5FLk79o002713@svn.freebsd.org>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Cc: svn-src-projects@freebsd.org, src-committers@freebsd.org
Subject: Re: svn commit: r209220 - projects/ppc64/sys/powerpc/aim
X-BeenThere: svn-src-projects@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the src &quot; projects&quot;
	tree" <svn-src-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-projects>, 
	<mailto:svn-src-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-projects>
List-Post: <mailto:svn-src-projects@freebsd.org>
List-Help: <mailto:svn-src-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-projects>, 
	<mailto:svn-src-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 20 Jun 2010 17:51:47 -0000

Nathan Whitehorn wrote:
> Author: nwhitehorn
> Date: Tue Jun 15 21:46:07 2010
> New Revision: 209220
> URL: http://svn.freebsd.org/changeset/base/209220
>
> Log:
>   Implement a page table spilling mechanism to allow the kernel to continue
>   when user-space applications have filled all the slots in a PTEG. This
>   relies on VM gracefully remapping pages when it gets faults on pages
>   it thinks are mapped already, which it seems to do in limited
>   forkbomb-based testing.
>   
>   Comments by alc appreciated before merging to HEAD.
>   

As long the mapping requested of pmap_enter() is valid upon return from 
that function, a pmap implementation is allowed to destroy any other 
mappings to pageable pages, i.e., pages and mappings that aren't wired, 
at any time.  So, based upon the above description, I don't think that 
you are doing anything inappropriate.

Regards,
Alan