From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753803AbZBUHeD (ORCPT ); Sat, 21 Feb 2009 02:34:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752193AbZBUHdx (ORCPT ); Sat, 21 Feb 2009 02:33:53 -0500 Received: from hera.kernel.org ([140.211.167.34]:37971 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752171AbZBUHdw (ORCPT ); Sat, 21 Feb 2009 02:33:52 -0500 Message-ID: <499FAE55.8070801@kernel.org> Date: Sat, 21 Feb 2009 16:33:41 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.19 (X11/20081227) MIME-Version: 1.0 To: Ingo Molnar CC: rusty@rustcorp.com.au, tglx@linutronix.de, x86@kernel.org, linux-kernel@vger.kernel.org, hpa@zytor.com, jeremy@goop.org, cpw@sgi.com Subject: Re: [PATCHSET x86/core/percpu] implement dynamic percpu allocator References: <1234958676-27618-1-git-send-email-tj@kernel.org> <499CA834.4080208@kernel.org> <20090219110718.GK2354@elte.hu> <499E20BC.4020408@kernel.org> <20090220093234.GF24555@elte.hu> <499FA8D1.8030806@kernel.org> In-Reply-To: <499FA8D1.8030806@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]); Sat, 21 Feb 2009 07:33:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tejun Heo wrote: > I can remove the TLB problem from non-NUMA case but for NUMA I still > don't have a good idea. Maybe we need to accept the overhead for > NUMA? I don't know. Hmmmm... one thing we can do on NUMA is to remap and free the remapped address and make __pa() and __va() handle that area specially. It's a bit convoluted but the added overhead should be minimal. It'll only be simple range check in __pa()/__va() and it's not like they are super hot paths anyway. I'll give it a shot. Thanks. -- tejun