Documentation/ABI/testing/sysfs-devices-system-cpu

   1 What:           /sys/devices/system/cpu/
   2 Date:           pre-git history
   3 Contact:        Linux kernel mailing list <linux-kernel@vger.kernel.org>
   4 Description:
   5                 A collection of both global and individual CPU attributes
   6
   7                 Individual CPU attributes are contained in subdirectories
   8                 named by the kernel's logical CPU number, e.g.:
   9
  10                 /sys/devices/system/cpu/cpu#/
  11
  12
  13 What:           /sys/devices/system/cpu/kernel_max
  14                 /sys/devices/system/cpu/offline
  15                 /sys/devices/system/cpu/online
  16                 /sys/devices/system/cpu/possible
  17                 /sys/devices/system/cpu/present
  18 Date:           December 2008
  19 Contact:        Linux kernel mailing list <linux-kernel@vger.kernel.org>
  20 Description:    CPU topology files that describe kernel limits related to
  21                 hotplug. Briefly:
  22
  23                 kernel_max: the maximum cpu index allowed by the kernel
  24                 configuration.
  25
  26                 offline: cpus that are not online because they have been
  27                 HOTPLUGGED off or exceed the limit of cpus allowed by the
  28                 kernel configuration (kernel_max above).
  29
  30                 online: cpus that are online and being scheduled.
  31
  32                 possible: cpus that have been allocated resources and can be
  33                 brought online if they are present.
  34
  35                 present: cpus that have been identified as being present in
  36                 the system.
  37
  38                 See Documentation/cputopology.txt for more information.
  39
  40
  41 What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
  42 Date:      August 2008
  43 KernelVersion:  2.6.27
  44 Contact:        mark.langsdorf@amd.com
  45 Description:    These files exist in every cpu's cache index directories.
  46                 There are currently 2 cache_disable_# files in each
  47                 directory.  Reading from these files on a supported
  48                 processor will return that cache disable index value
  49                 for that processor and node.  Writing to one of these
  50                 files will cause the specificed cache index to be disabled.
  51
  52                 Currently, only AMD Family 10h Processors support cache index
  53                 disable, and only for their L3 caches.  See the BIOS and
  54                 Kernel Developer's Guide at
  55                 http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
  56                 for formatting information and other details on the
  57                 cache index disable.
  58 Users:    joachim.deguara@amd.com