From owner-svn-src-projects@FreeBSD.ORG Sun Jun 20 17:51:47 2010 Return-Path: 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 ; 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 ; 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 User-Agent: Thunderbird 2.0.0.24 (X11/20100501) MIME-Version: 1.0 To: Nathan Whitehorn 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 " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-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