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

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Date:	Wed, 21 Apr 2010 15:24:14 -0700
From:	Greg KH <gregkh@...e.de>
To:	John Stoffel <john@...ffel.org>
Cc:	Hedi Berriche <hedi@....com>, Rik van Riel <riel@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
	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 Wed, Apr 21, 2010 at 04:10:08PM -0400, John Stoffel wrote:
> >>>>> "Hedi" == Hedi Berriche <hedi@....com> writes:
> 
> Hedi> On Wed, Apr 21, 2010 at 20:15 John Stoffel wrote:
> Hedi> | >>>>> "Rik" == Rik van Riel <riel@...hat.com> writes:
> Hedi> | 
> Hedi> | Rik> That is 15 kernel threads per CPU.
> Hedi> | 
> Hedi> | Rik> Reducing the number of kernel threads sounds like a
> Hedi> | Rik> useful thing to do.
> Hedi> | 
> Hedi> | Isn't that already a project? 
> 
> Hedi> Yes, thanks to Alan's probing I looked it up 
> 
> Hedi>     http://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git
> 
> Hedi> but we're definitely talking long term solution vs. something
> Hedi> that can ease pain now.
> 
> It seems to me that running Linux on such a large machine is such a
> specialized niche, the putting in your change to the regular kernel
> isn't a near term need either.  And from the sounds of it, Tejun's
> work has better long term potential.

Tejun's work has much better long term potential, but this is still an
issue for large #cpu systems, which we want Linux to support well.  This
isn't a "specialized niche" for Linux, at all, Linux pretty much
dominates this hardware area, and it would be nice to ensure that this
continues.

thanks,

greg k-h
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