From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758173AbZBSAb0 (ORCPT ); Wed, 18 Feb 2009 19:31:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753730AbZBSAbR (ORCPT ); Wed, 18 Feb 2009 19:31:17 -0500 Received: from hera.kernel.org ([140.211.167.34]:45641 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752246AbZBSAbR (ORCPT ); Wed, 18 Feb 2009 19:31:17 -0500 Message-ID: <499CA834.4080208@kernel.org> Date: Thu, 19 Feb 2009 09:30:44 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: rusty@rustcorp.com.au, tglx@linutronix.de, x86@kernel.org, linux-kernel@vger.kernel.org, hpa@zytor.com, jeremy@goop.org, cpw@sgi.com, mingo@elte.hu Subject: Re: [PATCHSET x86/core/percpu] implement dynamic percpu allocator References: <1234958676-27618-1-git-send-email-tj@kernel.org> In-Reply-To: <1234958676-27618-1-git-send-email-tj@kernel.org> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Thu, 19 Feb 2009 00:31:00 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tejun Heo wrote: > One trick we can do is to reserve the initial chunk in non-vmalloc > area so that at least the static cpu ones and whatever gets > allocated in the first chunk is served by regular large page > mappings. Given that those are most frequent visited ones, this > could be a nice compromise - no noticeable penalty for usual cases > yet allowing scalability for unusual cases. If this is something > which can be agreed on, I'll pursue this. I've given more thought to this and it actually will solve most of issues for non-NUMA but it can't be done for NUMA. Any better ideas? Thanks. -- tejun