linux-kernel - Re: [RFC PATCH] proc, pidns: Add highpid

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Date:	Sun, 30 Nov 2014 14:08:13 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	Pavel Emelyanov <xemul@...allels.com>, criu@...nvz.org,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Herrmann <dh.herrmann@...il.com>,
	systemd Mailing List <systemd-devel@...ts.freedesktop.org>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] proc, pidns: Add highpid

On Nov 30, 2014 1:47 AM, "Florian Weimer" <fw@...eb.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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