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

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Message-ID: <87k32d13d5.fsf@mid.deneb.enyo.de>
Date:	Sun, 30 Nov 2014 09:47:50 +0100
From:	Florian Weimer <fw@...eb.enyo.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	David Herrmann <dh.herrmann@...il.com>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	systemd Mailing List <systemd-devel@...ts.freedesktop.org>,
	criu@...nvz.org, Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [RFC PATCH] proc, pidns: Add highpid

* 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?
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