[CRIU] [RFC PATCH] proc, pidns: Add highpid

[Florian Weimer]

* Andy Lutomirski:

> On Nov 30, 2014 1:47 AM, "Florian Weimer" <fw at deneb.enyo.de> wrote:
>>
>> * Andy Lutomirski:
>>
>> > The initial implementation is straightforward: highpid is simply a
>> > 64-bit counter. If a high-end system can fork every 3 ns (which
>> > would be amazing, given that just allocating a pid requires at
>> > atomic operation), it would take well over 1000 years for highpid to
>> > wrap.
>>
>> I'm not sure if I'm reading the patch correctly, but is the counter
>> namespaced?  If yes, why?
>
> It's namespaced so that CRIU can migrate/restore a whole pid namespace.

Oh well, this requirement is at odds with system-wide uniqueness.  Is
CRIU really that important? :-)