From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by rv-out-0910.google.com with SMTP id f1so1806290rvb.26 for ; Wed, 26 Mar 2008 12:28:28 -0700 (PDT) Message-ID: <86802c440803261228m5026bca1x46047c0dc656545c@mail.gmail.com> Date: Wed, 26 Mar 2008 12:28:28 -0700 From: "Yinghai Lu" Subject: Re: [PATCH 2/2] x86: Modify Kconfig to allow up to 4096 cpus 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: owner-linux-mm@kvack.org Return-Path: To: Mike Travis Cc: Andrew Morton , Ingo Molnar , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org