Subject: Re: [RFC] [PATCH 00/13] Introduce task_pid api
From: Dave Hansen <haveblue@us.ibm.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Kyle Moffett <mrmacman_g4@mac.com>,
       "SERGE E. HALLYN [imap]" <serue@us.ibm.com>, Paul Jackson <pj@sgi.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       frankeh@watson.ibm.com
In-Reply-To: <20051116203603.GA12505@elf.ucw.cz>
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Date: Wed, 16 Nov 2005 21:48:10 +0100
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On Wed, 2005-11-16 at 21:36 +0100, Pavel Machek wrote:
> Hmm... it is hard to judge a patch without context. Anyway, can't we
> get process snasphot/resume without virtualizing pids? Could we switch
> to 128-bits so that pids are never reused or something like that?

That might work fine for a managed cluster, but it wouldn't be a good
fit if you ever wanted to support something like a laptop in
disconnected operation, or if you ever want to restore the same snapshot
more than once.  There may also be some practical userspace issues
making pids that large.

I also hate bloating types and making them sparse just for the hell of
it.  It is seriously demoralizing to do a ps and see
7011827128432950176177290 staring back at you. :)

-- Dave

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