From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from [10.3.1.93] (helo=sc8-sf-list1-new.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1FYpFX-0006Mq-O7 for user-mode-linux-devel@lists.sourceforge.net; Wed, 26 Apr 2006 12:00:31 -0700 Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1FYpFX-0006db-Te for user-mode-linux-devel@lists.sourceforge.net; Wed, 26 Apr 2006 12:00:31 -0700 Received: from [198.99.130.12] (helo=saraswathi.solana.com) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1FYpFW-0003HH-Bu for user-mode-linux-devel@lists.sourceforge.net; Wed, 26 Apr 2006 12:00:31 -0700 From: Jeff Dike Message-ID: <20060426180110.GB8142@ccure.user-mode-linux.org> References: <200604131719.k3DHJcZG004674@ccure.user-mode-linux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: [uml-devel] Re: [RFC] PATCH 0/4 - Time virtualization Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Wed, 26 Apr 2006 14:01:10 -0400 To: "Eric W. Biederman" Cc: linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net On Wed, Apr 19, 2006 at 02:25:00AM -0600, Eric W. Biederman wrote: > That patch should probably be separated, from the rest. > But it looks like a fairly sane idea. Yeah, I'll keep these together for now, but the ptrace one is conceptually different from the rest. > I think you missed a couple essential things to a time namespace. > Timers. The posix timers, in particular. The worst > of those is the monotonic timer. Oops, thanks for pointing that out. > In the case of migration the ugly case to properly handle is the > monotonic timer. That needs an offset yet it is absolutely forbidden > to provide that offset from the inside. So this is the one namespace > that I think is inappropriate to use sys_unshare to create. > We need a system call so that we can specify the minimum or the > starting monotonic time base. For migration, it looks like the container will have to specify the time base at creation so that everything in it will have a consistent view of time if they get moved around. So, maybe it belongs in clone as a "backwards" flag similar to CLONE_NEWNS. Jeff ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel