From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Serge E. Hallyn" Subject: Re: [PATCH] [RFC] c/r: Add UTS support Date: Wed, 18 Mar 2009 08:49:32 -0500 Message-ID: <20090318134932.GC22636@us.ibm.com> References: <1236880612-15316-1-git-send-email-danms@us.ibm.com> <20090312162954.4a4b8e00@thinkcentre.lan> <87fxhipfrh.fsf@caffeine.danplanet.com> <20090312224820.GA12723@hallyn.com> <87bps6pcyf.fsf@caffeine.danplanet.com> <49C0B069.6060300@cs.columbia.edu> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <49C0B069.6060300-eQaUEPhvms7ENvBUuze7eA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Oren Laadan Cc: containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org, Dan Smith , Nathan Lynch List-Id: containers.vger.kernel.org Quoting Oren Laadan (orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org): > > > Dan Smith wrote: > > SH> Well it forces restart to go through the established userspace > > SH> API's when creating resources (in this case, tasks and namespaces) > > SH> which means any existing security guarantees are leveraged. > > > > That's a very valid point. However, it still seems unbalanced to make > > checkpoint a completely in-kernel process and restart an odd mix of > > the two with potentially more confusing semantics and requirements. > > > > There are other reasons to allow restart to be not fully symmetric > with respect to checkpoint. For example, if you have a smart(er) user > space application that wants to provide the restart some of the resources > pre-constructed, allowing much flexibility (already requested by people) > for the restart provdure (E.g., when doing distributed checkpoint, or > when restarting a special device whose). > > See my post: > https://lists.linux-foundation.org/pipermail/containers/2009-March/016234.html (Note that in Dan's next version, he did move unshare into userspace) -serge