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Date: Fri, 7 Aug 2009 15:05:59 +0200 From: Andreas Herrmann <andreas.herrmann3@....com> To: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de> CC: linux-kernel@...r.kernel.org, Borislav Petkov <borislav.petkov@....com>, Brice Goglin <Brice.Goglin@...ia.fr> Subject: [PATCH 8/8] topology: Update CPU topology documentation Mention new attributes introduced for multi-node processor support. Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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