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

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Date:	Wed, 21 Apr 2010 15:14:21 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Hedi Berriche <hedi@....com>, 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

>>>>> "Rik" == Rik van Riel <riel@...hat.com> writes:

Rik> 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.

Rik> That is 15 kernel threads per CPU.

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

Isn't that already a project?  I thought someone (Jeff? Jorn? Tejun? Bueller
bueller....?) was already proposing a patch set to reduce the number
of kernel threads by having dynamic workqueues instead, so that we
didn't spawn a bunch of threads that never did anything?

John
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