From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oren Laadan Subject: Re: [PATCH] c/r: Add UTS support (v4) Date: Fri, 20 Mar 2009 17:26:59 -0400 Message-ID: <49C40A23.6080708@cs.columbia.edu> References: <1237402291-28812-1-git-send-email-danms@us.ibm.com> <49C2C686.2060806@cs.columbia.edu> <871vstdtn1.fsf@caffeine.danplanet.com> <49C2CDFA.4010907@cs.columbia.edu> <49C2D183.8040905@cs.columbia.edu> <20090320181043.GB8380@us.ibm.com> <49C3EFAF.9030706@cs.columbia.edu> <1237579196.8286.239.camel@nimitz> <49C4011C.1050707@cs.columbia.edu> <1237582825.8286.285.camel@nimitz> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1237582825.8286.285.camel@nimitz> 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: Dave Hansen Cc: containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org, Dan Smith , adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org List-Id: containers.vger.kernel.org Dave Hansen wrote: > On Fri, 2009-03-20 at 16:48 -0400, Oren Laadan wrote: >> Does that scale well with many (1000's) of tasks ? >> >> (The motivation to expose 'nsproxy_objref' to user space was to allow >> user-space to decide on a sequence of clones/unshared that will create >> an equivalent process tree with space-efficient nsproxy's). > > OK, so you're saying that there's no way for userspace to tell that a > set of tasks share an nsproxy other than exporting that nsproxy? I don't think so. Maybe the namespaces people know better. Oren. > >> Perhaps instead of nsproxy_equal() we could use an 'nsproxy_objref' >> to know a-priori that it is common, and save the "compare-and-swap" >> phase altogether. > > Sure, that's workable. The important thing is that it is an > optimization that can be left for later. > > -- Dave > >