From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756152AbZHGNHF (ORCPT ); Fri, 7 Aug 2009 09:07:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755844AbZHGNHE (ORCPT ); Fri, 7 Aug 2009 09:07:04 -0400 Received: from outbound-dub.frontbridge.com ([213.199.154.16]:4962 "EHLO IE1EHSOBE004.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753737AbZHGNHC (ORCPT ); Fri, 7 Aug 2009 09:07:02 -0400 X-SpamScore: 1 X-BigFish: VPS1(z5edIz14c3M853ka4a4kzz1202hzzz32i6bh203h62h) X-Spam-TCS-SCL: 1:0 X-WSS-ID: 0KO0CF6-01-2JC-02 X-M-MSG: Date: Fri, 7 Aug 2009 15:05:59 +0200 From: Andreas Herrmann To: Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner CC: linux-kernel@vger.kernel.org, Borislav Petkov , Brice Goglin Subject: [PATCH 8/8] topology: Update CPU topology documentation Message-ID: <20090807130559.GA6520@alberich.amd.com> References: <20090807125609.GH7198@alberich.amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20090807125609.GH7198@alberich.amd.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-OriginalArrivalTime: 07 Aug 2009 13:05:59.0573 (UTC) FILETIME=[CF008450:01CA175F] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mention new attributes introduced for multi-node processor support. Signed-off-by: Andreas Herrmann --- Documentation/cputopology.txt | 35 +++++++++++++++++++++++++++++------ 1 files changed, 29 insertions(+), 6 deletions(-) diff --git a/Documentation/cputopology.txt b/Documentation/cputopology.txt index b41f3e5..48914b1 100644 --- a/Documentation/cputopology.txt +++ b/Documentation/cputopology.txt @@ -3,13 +3,32 @@ Export cpu topology info via sysfs. Items (attributes) are similar to /proc/cpuinfo. 1) /sys/devices/system/cpu/cpuX/topology/physical_package_id: -represent the physical package id of cpu X; + represents the physical package id of cpu X; 2) /sys/devices/system/cpu/cpuX/topology/core_id: -represent the cpu core id to cpu X; -3) /sys/devices/system/cpu/cpuX/topology/thread_siblings: -represent the thread siblings to cpu X in the same core; -4) /sys/devices/system/cpu/cpuX/topology/core_siblings: -represent the thread siblings to cpu X in the same physical package; + represents the cpu core id of cpu X; +3) /sys/devices/system/cpu/cpuX/topology/cpu_node_id: + represents the processor internal node_id of cpu X; +4) /sys/devices/system/cpu/cpuX/topology/thread_siblings: + represents the thread siblings of cpu X in the same core; +5) /sys/devices/system/cpu/cpuX/topology/core_siblings: + represents the thread siblings of cpu X in the same processor + internal node; +6) /sys/devices/system/cpu/cpuX/topology/cpu_node_siblings: + represents the thread siblings of cpu X in the same physical + package; + +Note: cpu_node_siblings and core_siblings differ only on + multi-node processors. On all other processors they are + identical and then cpu_node_id is always 0. + +With that CPU topology is mapped into following hierarchy: + + Level | Set of CPUs + --------------|--------------- + phys_package | cpu_node_siblings + cpu_node | core_siblings + core | thread_siblings + thread | one CPU To implement it in an architecture-neutral way, a new source file, drivers/base/topology.c, is to export the 4 attributes. @@ -20,6 +39,8 @@ these macros in include/asm-XXX/topology.h: #define topology_core_id(cpu) #define topology_thread_cpumask(cpu) #define topology_core_cpumask(cpu) +#define topology_cpu_node_id(cpu) +#define topology_cpu_node_siblings(cpu) The type of **_id is int. The type of siblings is (const) struct cpumask *. @@ -31,6 +52,8 @@ not defined by include/asm-XXX/topology.h: 2) core_id: 0 3) thread_siblings: just the given CPU 4) core_siblings: just the given CPU +5) cpu_node_id: 0 +6) cpu_node_siblings: identical to core_siblings Additionally, cpu topology information is provided under /sys/devices/system/cpu and includes these files. The internal -- 1.6.3.3