From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Serge E. Hallyn" Subject: Re: [PATCH 1/3] change clone_flags type to u64 Date: Thu, 10 Apr 2008 12:14:53 -0500 Message-ID: <20080410171453.GA7023@sergelap.ibm.com> References: <20080409222611.GA28087@us.ibm.com> <20080409223231.GA28267@us.ibm.com> <871w5enmk7.fsf@basil.nowhere.org> <47FE073B.3060007@fr.ibm.com> <20080410125205.GG10019@one.firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20080410125205.GG10019@one.firstfloor.org> Sender: linux-kernel-owner@vger.kernel.org To: Andi Kleen Cc: Cedric Le Goater , sukadev@us.ibm.com, Andrew Morton , serue@us.ibm.com, "David C. Hansen" , Pavel Emelyanov , Containers , linux-kernel@vger.kernel.org List-Id: containers.vger.kernel.org Quoting Andi Kleen (andi@firstfloor.org): > > I guess that was a development rationale. > > But what rationale? It just doesn't make much sense to me. > > > Most of the namespaces are in > > use in the container projects like openvz, vserver and probably others > > and we needed a way to activate the code. > > You could just have added it to feature groups over time. > > > > > Not perfect I agree. > > > > > With your current strategy are you sure that even 64bit will > > > be enough in the end? For me it rather looks like you'll > > > go through those quickly too as more and more of the kernel > > > is namespaced. > > > > well, we're reaching the end. I hope ! devpts is in progress and > > mq is just waiting for a clone flag. > > Are you sure? Well for one thing we can take a somewhat different approach to new clone flags. I.e. we could extend CLONE_NEWIPC to do mq instead of introducing a new clone flag. The name doesn't have 'sysv' in it, and globbing all ipc resources together makes some amount of sense. Similarly has hpa+eric pointed out earlier, suka could use CLONE_NEWDEV for ptys. If we have net, pid, ipc, devices, that's a pretty reasonable split imo. Perhaps we tie user to devices and get rid of CLONE_NEWUSER which I suspect noone is using atm (since only Dave has run into the CONFIG_USER_SCHED problem). Or not. We could roll uts into net, and give CLONE_NEWUTS a deprecation period. -serge