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

From: Florian Weimer
Date: Mon Dec 01 2014 - 01:47:43 EST

* Andy Lutomirski:

> On Nov 30, 2014 1:47 AM, "Florian Weimer" <fw@xxxxxxxxxxxxx> 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? :-)
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