Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760091AbYCZT2i (ORCPT ); Wed, 26 Mar 2008 15:28:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755738AbYCZT2b (ORCPT ); Wed, 26 Mar 2008 15:28:31 -0400 Received: from wr-out-0506.google.com ([64.233.184.237]:61536 "EHLO wr-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754883AbYCZT2a (ORCPT ); Wed, 26 Mar 2008 15:28:30 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=o5p37EDZ273bmY35VqNqDrQpNwCULN0FddLmUzpN614yjRCXFUjDoYIoC2tlzd/A9dVpD7Hy7w3qn9H6kXsh588Vbj6eS6S0c+F4FBqhfkXdYunqLi/spMp5SqJcPVLFBHtfudJ6tD1ftaltHx55dxiJBvI11itQiTFV4DTNlVA= Message-ID: <86802c440803261228m5026bca1x46047c0dc656545c@mail.gmail.com> Date: Wed, 26 Mar 2008 12:28:28 -0700 From: "Yinghai Lu" To: "Mike Travis" Subject: Re: [PATCH 2/2] x86: Modify Kconfig to allow up to 4096 cpus Cc: "Andrew Morton" , "Ingo Molnar" , linux-mm@kvack.org, linux-kernel@vger.kernel.org In-Reply-To: <20080326014138.292294000@polaris-admin.engr.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080326014137.934171000@polaris-admin.engr.sgi.com> <20080326014138.292294000@polaris-admin.engr.sgi.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2057 Lines: 54 On Tue, Mar 25, 2008 at 6:41 PM, Mike Travis wrote: > Increase the limit of NR_CPUS to 4096 and introduce a boolean > called "MAXSMP" which when set (e.g. "allyesconfig"), will set > NR_CPUS = 4096 and NODES_SHIFT = 9 (512). > > Based on: > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git > git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git > > Signed-off-by: Mike Travis > --- > arch/x86/Kconfig | 20 ++++++++++++++++---- > 1 file changed, 16 insertions(+), 4 deletions(-) > > --- linux.trees.git.orig/arch/x86/Kconfig > +++ linux.trees.git/arch/x86/Kconfig > @@ -522,16 +522,24 @@ config SWIOTLB > access 32-bits of memory can be used on systems with more than > 3 GB of memory. If unsure, say Y. > > +config MAXSMP > + bool "Configure Maximum number of SMP Processors" > + depends on X86_64 && SMP > + default n > + help > + Configure maximum number of CPUS for this architecture. > + If unsure, say N. > > config NR_CPUS > - int "Maximum number of CPUs (2-255)" > - range 2 255 > + int "Maximum number of CPUs (2-4096)" > + range 2 4096 > depends on SMP > + default "4096" if MAXSMP > default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 > default "8" > help > This allows you to specify the maximum number of CPUs which this > - kernel will support. The maximum supported value is 255 and the > + kernel will support. The maximum supported value is 4096 and the > minimum value which makes sense is 2. > > This is purely to save memory - each supported CPU adds or put if MAXSMP around NR_CPUS... YH -- 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/