13 Jun, 2008
1 commit
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This can result in an empty topology directory in sysfs, and requires
in-kernel users to protect all uses with #ifdef - see
.The documentation of CPU topology specifies what the defaults should be if
only partial information is available from the hardware. So we can
provide these defaults as a fallback.This patch:
- Adds default definitions of the 4 topology macros to
- Changes drivers/base/topology.c to use the topology macros unconditionally
and to cope with definitions that aren't lvalues
- Updates documentation accordingly[ From: Andrew Morton
- fold now-duplicated code
- fix layout
]Signed-off-by: Ben Hutchings
Cc: Vegard Nossum
Cc: Nick Piggin
Cc: Chandra Seetharaman
Cc: Suresh Siddha
Cc: Mike Travis
Cc: Christoph Lameter
Cc: John Hawkes
Cc: Zhang, Yanmin
Signed-off-by: Andrew Morton
Signed-off-by: Ingo Molnar
04 Oct, 2006
1 commit
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This patch fixes typos in various Documentation txts. This patch addresses
some words starting with the letters 'D'-'E'.Signed-off-by: Matt LaPlante
Signed-off-by: Adrian Bunk
29 Mar, 2006
1 commit
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Fix a few trivial mistakes in Documentation/cputopology.txt
Signed-off-by: Jesper Juhl
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Feb, 2006
1 commit
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The patch implements cpu topology exportation by 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;
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;To implement it in an architecture-neutral way, a new source file,
driver/base/topology.c, is to export the 5 attributes.If one architecture wants to support this feature, it just needs to
implement 4 defines, typically in file include/asm-XXX/topology.h.
The 4 defines are:
#define topology_physical_package_id(cpu)
#define topology_core_id(cpu)
#define topology_thread_siblings(cpu)
#define topology_core_siblings(cpu)The type of **_id is int.
The type of siblings is cpumask_t.To be consistent on all architectures, the 4 attributes should have
deafult values if their values are unavailable. Below is the rule.1) physical_package_id: If cpu has no physical package id, -1 is the
default value.2) core_id: If cpu doesn't support multi-core, its core id is 0.
3) thread_siblings: Just include itself, if the cpu doesn't support
HT/multi-thread.4) core_siblings: Just include itself, if the cpu doesn't support
multi-core and HT/Multi-thread.So be careful when declaring the 4 defines in include/asm-XXX/topology.h.
If an attribute isn't defined on an architecture, it won't be exported.
Thank Nathan, Greg, Andi, Paul and Venki.
The patch provides defines for i386/x86_64/ia64.
Signed-off-by: Zhang, Yanmin
Cc: Ingo Molnar
Cc: Nick Piggin
Cc: Greg KH
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds