Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753492Ab0KCHT7 (ORCPT ); Wed, 3 Nov 2010 03:19:59 -0400 Received: from mga01.intel.com ([192.55.52.88]:46440 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753186Ab0KCHT5 (ORCPT ); Wed, 3 Nov 2010 03:19:57 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.58,288,1286175600"; d="scan'208";a="623035171" Subject: Re: [RFC 4/4]x86: avoid tlbstate lock if no enough cpus From: Shaohua Li To: Eric Dumazet Cc: lkml , Ingo Molnar , Andi Kleen , "hpa@zytor.com" In-Reply-To: <1288768330.2467.660.camel@edumazet-laptop> References: <1288766668.23014.117.camel@sli10-conroe> <1288767580.2467.636.camel@edumazet-laptop> <1288767995.23014.120.camel@sli10-conroe> <1288768330.2467.660.camel@edumazet-laptop> Content-Type: text/plain; charset="UTF-8" Date: Wed, 03 Nov 2010 15:19:55 +0800 Message-ID: <1288768795.23014.123.camel@sli10-conroe> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 804 Lines: 19 On Wed, 2010-11-03 at 15:12 +0800, Eric Dumazet wrote: > Le mercredi 03 novembre 2010 à 15:06 +0800, Shaohua Li a écrit : > > just don't want to include the non-present cpus here. I wonder why we > > haven't a variable to record online cpu number. > > What prevents a 256 cpus machine, to have 8 online cpus that all use the > same TLB vector ? > > (Max 32 vectors, so 8 cpus share each vector, settled at boot time) > > Forget about 'online', and think 'possible' ;) Hmm, the spread vectors to node already merged, how could the 8 cpus share a vector? -- 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/