linux-kernel - Re: [Patch 1/1] init: Provide a kernel start parameter to increase pid

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Date:	Wed, 21 Apr 2010 13:18:35 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hedi Berriche <hedi@....com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Mike Travis <travis@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jack Steiner <steiner@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robin Holt <holt@....com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Patch 1/1] init: Provide a kernel start parameter to increase
 pid_max v2

On 04/21/2010 12:59 PM, Hedi Berriche wrote:
> On Wed, Apr 21, 2010 at 10:20 Alan Cox wrote:
> |>  of 32k will not be enough.  A system with 1664 CPU's, there are 25163 processes
> |>  started before the login prompt.  It's estimated that with 2048 CPU's we will pass
> |
> | Is that perhaps the bug not the 32K limit?
>
> Doubt it: I just checked on an *idle* 1664 CPUs system and I can see 26844
> tasks, all but few being kernel threads.

That is 15 kernel threads per CPU.

Reducing the number of kernel threads sounds like a
useful thing to do.
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