From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756015AbZFXX4v (ORCPT ); Wed, 24 Jun 2009 19:56:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752649AbZFXX4n (ORCPT ); Wed, 24 Jun 2009 19:56:43 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:44259 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751898AbZFXX4m (ORCPT ); Wed, 24 Jun 2009 19:56:42 -0400 Date: Wed, 24 Jun 2009 16:55:08 -0700 From: Andrew Morton To: Tejun Heo Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu, andi@firstfloor.org, hpa@zytor.com, tglx@linutronix.de, cl@linux-foundation.org Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support Message-Id: <20090624165508.30b88343.akpm@linux-foundation.org> In-Reply-To: <1245850216-31653-1-git-send-email-tj@kernel.org> References: <1245850216-31653-1-git-send-email-tj@kernel.org> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.20; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 24 Jun 2009 22:30:06 +0900 Tejun Heo wrote: > This patchset is available in the following git tree and will be > published in for-next if there's no major objection. It might get > rebased before going into for-next. > > git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git lpage-numa Boy, this stuff is complicated. Does it all work? The Impact: lines were useful :) I assume from the tremendous number of for_each_possible_cpu()s that CPU hotplug awareness won't be happening. Do we have a feeling for the amount of wastage here? If num_possible_cpus() - num_online_cpus() == N and N is large, what did it cost? And what are reasonable values of N?