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Date: Thu, 8 Aug 2002 19:44:16 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: Paul Larson <plars@austin.ibm.com>
Cc: Linus Torvalds <torvalds@transmeta.com>,
       Hubertus Franke <frankeh@us.ibm.com>, Andries Brouwer <aebr@win.tue.nl>,
       Andrew Morton <akpm@zip.com.au>, <andrea@suse.de>,
       Dave Jones <davej@suse.de>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Linux-2.5 fix/improve get_pid()
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On 8 Aug 2002, Paul Larson wrote:

> The original issue that I had with all of this is the fact that if the
> current algorithm can't find an available pid, it just sits there
> churning forever and hangs the machine.  My original patch was really
> just a very basic fix for that (see the 2.4 tree).  This makes it far
> more unlikely for us to max out, but if we do aren't we just going to
> have the same trouble all over?

You'll need at least 330 million tasks to run out.

At a minimum kernel memory allocation of about 8 kB per
task, that's about 2600 GB of kernel data structures.

I'm not sure we'll hit that limit, ever. Not because
we won't have a TB of kernel data space at some point
in the future, but because 330 million tasks is a lot
more than we'd want to manage with just a few CPUs ;)

kind regards,

Rik
-- 
	http://www.linuxsymposium.org/2002/
"You're one of those condescending OLS attendants"
"Here's a nickle kid.  Go buy yourself a real t-shirt"

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