Re: RFC [patch 13/34] PID Virtualization Define new task_pid api

[ebiederm@xmission.com (Eric W. Biederman)]

Hubertus Franke <frankeh@watson.ibm.com> writes:

> That's a good idea .. right now we simply did this through a flag left by the
> call
> to the /proc/container fs ... (awkward at best, but didn't break the API).
> I have a concern wrt doing it in during fork namely the sharing of resources.
> Whe obviously are looking at some constraints here wrt to sharing. We need to
> ensure that this ain't a thread etc that will share resources
> across "containers" (which then later aren't migratable due to that sharing).
> So doing the fork_exec() atomically would avoid that problem.

Checking that we aren't sharing things to become a thread is fairly straight
forward. do_fork already has similar checks in place.

This sounds like a classic case of if you don't want that don't do that
then.

Eric





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