From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758132AbZFYT1a (ORCPT ); Thu, 25 Jun 2009 15:27:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752687AbZFYT1W (ORCPT ); Thu, 25 Jun 2009 15:27:22 -0400 Received: from terminus.zytor.com ([198.137.202.10]:33061 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752600AbZFYT1V (ORCPT ); Thu, 25 Jun 2009 15:27:21 -0400 Message-ID: <4A43871F.9030507@zytor.com> Date: Thu, 25 Jun 2009 07:18:07 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Andi Kleen CC: Andrew Morton , Tejun Heo , linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, cl@linux-foundation.org Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support References: <1245850216-31653-1-git-send-email-tj@kernel.org> <20090624165508.30b88343.akpm@linux-foundation.org> <20090625000202.GR6760@one.firstfloor.org> <4A42C131.6040007@zytor.com> <20090625091939.GS6760@one.firstfloor.org> In-Reply-To: <20090625091939.GS6760@one.firstfloor.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen wrote: >>> >> *Ahem* virtual machines *ahem*... > > And? Even there's not that big typically. > > The traditional problem was just for 128 NR_CPUs kernel were nothing > was sized based on machine capacity. > > Also on large systems the VMs shouldn't be sized for full capacity. > We have already have cases where the "possible" CPUs have eaten up the entire vmalloc area on 32 bits. In real use. It's a real problem. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.