linux-toradex.git/Documentation/cputopology.txt, branch v3.12.28

doc: Documentation/cputopology.txt fix typo

2013-09-04T10:59:47+00:00

Fix a trivial typo in Documentation/cputopology.txt

Signed-off-by: Xishi Qiu 
Signed-off-by: Jiri Kosina

topology/sysfs: Provide book id and siblings attributes

2010-09-09T18:41:25+00:00

Create attributes:

 /sys/devices/system/cpu/cpuX/topology/book_id
 /sys/devices/system/cpu/cpuX/topology/book_siblings

which show the book id and the book siblings of a cpu.

Unlike the attributes for SMT and MC these attributes are only present if
CONFIG_SCHED_BOOK is set. There is no reason to pollute sysfs for every
architecture with unused attributes.

Signed-off-by: Heiko Carstens 
Signed-off-by: Peter Zijlstra 
LKML-Reference: <20100831082844.435648457@de.ibm.com>
Signed-off-by: Ingo Molnar

Documentation: ABI: /sys/devices/system/cpu/cpu#/ topology files

2009-10-30T21:59:52+00:00

Add brief descriptions for the following sysfs files:

	/sys/devices/system/cpu/cpu#/topology/core_id
	/sys/devices/system/cpu/cpu#/topology/core_siblings
	/sys/devices/system/cpu/cpu#/topology/core_siblings_list
	/sys/devices/system/cpu/cpu#/topology/physical_package_id
	/sys/devices/system/cpu/cpu#/topology/thread_siblings
	/sys/devices/system/cpu/cpu#/topology/thread_siblings_list

The descriptions in Documentation/cputopology.txt weren't very
informative, so I attempted a better description based on code
reading and hopeful guessing.

Updated Documentation/cputopology.txt with the better descriptions and
fixed some style issues.

Cc: Mike Travis 
Cc: Rusty Russell 
Signed-off-by: Alex Chiang 
Signed-off-by: Greg Kroah-Hartman

cpumask: Use topology_core_cpumask()/topology_thread_cpumask()

2009-01-11T18:12:49+00:00

Impact: reduce stack usage, use new cpumask API.

This actually uses topology_core_cpumask() and
topology_thread_cpumask(), removing the only users of
topology_core_siblings() and topology_thread_siblings()

Signed-off-by: Rusty Russell 
Signed-off-by: Mike Travis 
Cc: linux-net-drivers@solarflare.com

sysfs: add documentation to cputopology.txt for system cpumasks

2008-12-19T07:17:12+00:00

Add information to cputopology.txt explaining the output of various
system cpumask's.

Signed-off-by: Mike Travis 
Signed-off-by: Rusty Russell 
Acked-by: Greg Kroah-Hartman

cpu topology: always define CPU topology information

2008-06-13T08:09:46+00:00

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

Fix typos in Documentation/: 'D'-'E'

2006-10-03T20:47:42+00:00

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

[PATCH] trivial typos in Documentation/cputopology.txt

2006-03-28T17:16:08+00:00

Fix a few trivial mistakes in Documentation/cputopology.txt

Signed-off-by: Jesper Juhl 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Export cpu topology in sysfs

2006-02-03T16:32:09+00:00

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