Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753219Ab0DUWhb (ORCPT ); Wed, 21 Apr 2010 18:37:31 -0400 Received: from cantor.suse.de ([195.135.220.2]:50431 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752641Ab0DUWha (ORCPT ); Wed, 21 Apr 2010 18:37:30 -0400 Date: Wed, 21 Apr 2010 15:24:14 -0700 From: Greg KH To: John Stoffel Cc: Hedi Berriche , Rik van Riel , Alan Cox , Mike Travis , Ingo Molnar , Linus Torvalds , Jack Steiner , Andrew Morton , Robin Holt , LKML Subject: Re: [Patch 1/1] init: Provide a kernel start parameter to increase pid_max v2 Message-ID: <20100421222414.GA26241@suse.de> References: <4BCE579C.5070100@sgi.com> <4BCE5A73.3000904@sgi.com> <20100421102350.4c222e6b@lxorguk.ukuu.org.uk> <20100421165934.GN16427@zorg.emea.sgi.com> <4BCF336B.1050706@redhat.com> <19407.20109.308816.104856@stoffel.org> <20100421193350.GU16427@zorg.emea.sgi.com> <19407.23456.469074.256306@stoffel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <19407.23456.469074.256306@stoffel.org> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1509 Lines: 39 On Wed, Apr 21, 2010 at 04:10:08PM -0400, John Stoffel wrote: > >>>>> "Hedi" == Hedi Berriche writes: > > Hedi> On Wed, Apr 21, 2010 at 20:15 John Stoffel wrote: > Hedi> | >>>>> "Rik" == Rik van Riel 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/