Cedric Le Goater <clg at fr.ibm.com> writes: > Serge E. Hallyn wrote: >> Well, assuming that we're using pids as identifiers, that means > > we can't because a process could die while the namespace is still > referenced by an other subsystem. We need some kind of id. Think of a session think of a process group heck think of threads a pid is not tied to one task struct. It is absolutely not a problem for a namespace to do get_pid(...) when it is initialized and put_pid(...) just before it is freed. All of the mechanisms for using pids for something like this are already in place. What we don't have is a fast pid to namespace transfer. But that is just an extra pointer in struct pid. Really that is a trivial patch. Giving every namespace a pid pointer in struct pid takes a little more space then I would like but it is not a big deal. Eric
