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List:       linux-api
Subject:    Re: [RFC PATCH] proc, pidns: Add highpid
From:       Andy Lutomirski <luto () amacapital ! net>
Date:       2014-11-30 22:08:13
Message-ID: CALCETrV_aArOr7v4AqLHdyGGNU-5XBPmvBXEqbVU36EJ_G26uQ () mail ! gmail ! com
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On Nov 30, 2014 1:47 AM, "Florian Weimer" <fw@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.

--Andy
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