From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756137Ab2ETPTQ (ORCPT ); Sun, 20 May 2012 11:19:16 -0400 Received: from orion.tchmachines.com ([208.76.84.200]:34885 "EHLO orion.tchmachines.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750972Ab2ETPTO (ORCPT ); Sun, 20 May 2012 11:19:14 -0400 Message-ID: <1337527148.6093.14.camel@vlad> Subject: [PATCH v3 0/2] Move x86_cpu_to_apicid to the __read_mostly section From: Vlad Zolotarov To: Thomas Gleixner , linux-kernel , Ingo Molnar , "H. Peter Anvin" , Ingo Molnar Cc: "Shai Fultheim (Shai@ScaleMP.com)" , Ido Yariv Date: Sun, 20 May 2012 18:19:08 +0300 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.2- Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - orion.tchmachines.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - scalemp.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pls., consider applying this patch series. It contains the following changes: - Adds two new macros DEFINE_EARLY_PER_CPU_READ_MOSTLY() and DECLARE_EARLY_PER_CPU_READ_MOSTLY(). - Adds "read-mostly" qualifier to the following variables in smp.h: - cpu_sibling_map - cpu_core_map - cpu_llc_shared_map - cpu_llc_id - cpu_number - x86_cpu_to_apicid - x86_bios_cpu_apicid - x86_cpu_to_logical_apicid As long as all the variables above are only written during the initialization, this change is meant to prevent the false sharing and improve the performance on large multiprocessor systems. v3 changes: - Added the missing definitions of DEFINE_EARLY_PER_CPU_READ_MOSTLY() and DECLARE_EARLY_PER_CPU_READ_MOSTLY() macros in the !CONFIG_SMP code path in arch/x86/include/asm/percpu.h. thanks, vlad