Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754472Ab2FGAgs (ORCPT ); Wed, 6 Jun 2012 20:36:48 -0400 Received: from mga11.intel.com ([192.55.52.93]:28689 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752265Ab2FGAgr (ORCPT ); Wed, 6 Jun 2012 20:36:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="175750699" Message-ID: <4FCFF72E.1050705@intel.com> Date: Thu, 07 Jun 2012 08:34:54 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111229 Thunderbird/9.0 MIME-Version: 1.0 To: Peter Zijlstra CC: Alex Shi , mingo@kernel.org, torvalds@linux-foundation.org, cmetcalf@tilera.com, tony.luck@intel.com, sivanich@sgi.com, akpm@linux-foundation.org, ralf@linux-mips.org, greg.pearson@hp.com, ink@jurassic.park.msu.ru, tglx@linutronix.de, rth@twiddle.net, kamezawa.hiroyu@jp.fujitsu.com, paulus@samba.org, linux-kernel@vger.kernel.org, hpa@zytor.com, anton@samba.org, lethal@linux-sh.org, davem@davemloft.net, benh@kernel.crashing.org, dhowells@redhat.com, mattst88@gmail.com, fenghua.yu@intel.com, linux-tip-commits@vger.kernel.org Subject: Re: [tip:sched/core] sched/numa: Rewrite the CONFIG_NUMA sched domain support References: <1338974105.2749.85.camel@twins> In-Reply-To: <1338974105.2749.85.camel@twins> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1267 Lines: 38 On 06/06/2012 05:15 PM, Peter Zijlstra wrote: > On Wed, 2012-06-06 at 15:43 +0800, Alex Shi wrote: >>> + /* >>> + * O(nr_nodes^2) deduplicating selection sort -- in order to find the >>> + * unique distances in the node_distance() table. >>> + * >>> + * Assumes node_distance(0,j) includes all distances in >>> + * node_distance(i,j) in order to avoid cubic time. >> >> Curious for other platforms node_distance number, actually, this >> assumption is right for what I saw Intel platforms. but it is not >> match acpispec50.pdf: >> >> Table 6-152 Example Relative Distances Between Proximity Domains >> Proximity Domain 0 1 2 3 >> 0 10 15 20 18 >> 1 15 10 16 24 >> 2 20 16 10 12 >> 3 18 24 12 10 > > Yes I know its allowed, I just haven't seen it in practice. I see. Thanks. > > I've got a patch that validates this assumption if you boot with > "sched_debug". If we ever run into such a setup we might need to fix > this -- it shouldn't be too hard, just expensive. Sure. -- 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/