Re: [lxc-devel] RFC: Device Namespaces

[Amir Goldstein <amir-3AfRa/s5aFdBDgjK7y7TUQ@public.gmane.org>]

On Thu, Sep 26, 2013 at 12:47 AM, Eric W. Biederman
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>wrote:

> Jeremy Andrus <jeremya-eQaUEPhvms7ENvBUuze7eA@public.gmane.org> writes:
>
> > On Sep 25, 2013, at 4:23 PM, Eric W. Biederman <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
> wrote:
> >
> >> Janne Karhunen <janne.karhunen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
> >>
> >>> That being said, is there a valid reason why binder is part of device
> >>> namespace here instead of IPC?
> >>
> >> I think the practical issue with binder was simply that binder only
> >> allows for a single instance and thus is does not play nicely with
> >> containers.
> >
> > It's true that there was a singleton paradigm in binder that had to be
> > overcome, but I agree with Janne. It really belongs in the IPC namespace,
> > and I don't see any technical reason not to move it there.
>
> *Blink* I missed the IPC namespace suggestion.
>
> The IPC namespace sounds reasonable.
>

Binder rewrite for IPC namespace is in the works (by Oren)
We discussed this with Greg and adding namespace support to binder (in
staging) seemed reasonable to him as well.


> Of course binder is still in staging because it has implementation and
> ABI problems.  Little things like a 64bit kernel and a 32bit userspace
> don't work particularly well.  So while fixing those problems it might
> be possible to fix the single container problem as well.  It would be a
> weird direction for cleanup of binder to come from but I don't see why
> that wouldn't work.
>
> Personally until binder is out of staging it seems reasonable to push
> for an API that sucks less, or for a more general solution that Androdid
> could use instead of binder.
>
> One of the uses of namespaces is to clean up after problematic kernel
> design decisions.  If we still have the option I would rather fix the
> problems than clean up after them.
>
> Eric
>
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