Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753610Ab0FATkL (ORCPT ); Tue, 1 Jun 2010 15:40:11 -0400 Received: from xenotime.net ([72.52.115.56]:41388 "HELO xenotime.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751762Ab0FATkJ convert rfc822-to-8bit (ORCPT ); Tue, 1 Jun 2010 15:40:09 -0400 Date: Tue, 1 Jun 2010 12:39:59 -0700 From: Randy Dunlap To: Giangiacomo Mariotti , Christoph Lameter , Pekka Enberg Cc: Bill Davidsen , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: Possible bug in 2.6.34 slub Message-Id: <20100601123959.747228c6.rdunlap@xenotime.net> In-Reply-To: References: <20100531165528.35a323fb.rdunlap@xenotime.net> <4C047CF9.9000804@tmr.com> Organization: YPO4 X-Mailer: Sylpheed 2.7.1 (GTK+ 2.16.6; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1987 Lines: 49 On Tue, 1 Jun 2010 21:17:40 +0200 Giangiacomo Mariotti wrote: > On Tue, Jun 1, 2010 at 5:22 AM, Bill Davidsen wrote: > > Randy Dunlap wrote: > >> > >> On Tue, 1 Jun 2010 01:39:43 +0200 Giangiacomo Mariotti wrote: > >> > >>> Hi, I've recently noticed this line on the dmesg output(kernel 2.6.34): > >>> [ ? ?0.000000] SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0, > >>> CPUs=16, Nodes=1 > >>> > >>> My cpu is an I7 920, so it has 4 cores and there's hyperthreading > >>> enabled, so there are 8 logical cpus. Is this a bug? > >> > >> > >> No, it's just some boot/init time information. > >> > > I would consider it a bug to claim CPUs=xx when xx is something other than > > the number of cores or the number of SMT threads supported by the processor. > > Of course if /proc/cpuinfo shows four siblings per core or something > > exciting, then it's right and you have a CPU you can sell to gizmodo and > > tell them a drunk left on the bar. > > > So....is it a bug or not? Sorry, I think that I misread your report. It does look like misinformation. Let's cc Christoph Lameter & Pekka. > The point is, I guess(didn't actually look at the code), if that's > just the count of MAX number of cpus supported, which is a config time > define and then the actual count gets refined afterwards by slub > too(because I know that the rest of the kernel knows I've got 4 > cores/8 logical cpus) or not. Is that it? If this is not the case(that > is, it's not a static define used as a MAX value), then I can't see > what kind of boot/init time info it is. If it's a boot-time info, it > just means it's a _wrong_ boot-time info. --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code *** -- 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/