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Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu deleted file mode 100644 index 5dab36448b4..00000000000 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ /dev/null @@ -1,178 +0,0 @@ -What: /sys/devices/system/cpu/ -Date: pre-git history -Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -Description: - A collection of both global and individual CPU attributes - - Individual CPU attributes are contained in subdirectories - named by the kernel's logical CPU number, e.g.: - - /sys/devices/system/cpu/cpu#/ - -What: /sys/devices/system/cpu/kernel_max - /sys/devices/system/cpu/offline - /sys/devices/system/cpu/online - /sys/devices/system/cpu/possible - /sys/devices/system/cpu/present -Date: December 2008 -Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -Description: CPU topology files that describe kernel limits related to - hotplug. Briefly: - - kernel_max: the maximum cpu index allowed by the kernel - configuration. - - offline: cpus that are not online because they have been - HOTPLUGGED off or exceed the limit of cpus allowed by the - kernel configuration (kernel_max above). - - online: cpus that are online and being scheduled. - - possible: cpus that have been allocated resources and can be - brought online if they are present. - - present: cpus that have been identified as being present in - the system. - - See Documentation/cputopology.txt for more information. - - -What: /sys/devices/system/cpu/probe - /sys/devices/system/cpu/release -Date: November 2009 -Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -Description: Dynamic addition and removal of CPU's. This is not hotplug - removal, this is meant complete removal/addition of the CPU - from the system. - - probe: writes to this file will dynamically add a CPU to the - system. Information written to the file to add CPU's is - architecture specific. - - release: writes to this file dynamically remove a CPU from - the system. Information writtento the file to remove CPU's - is architecture specific. - -What: /sys/devices/system/cpu/cpu#/node -Date: October 2009 -Contact: Linux memory management mailing list <linux-mm@kvack.org> -Description: Discover NUMA node a CPU belongs to - - When CONFIG_NUMA is enabled, a symbolic link that points - to the corresponding NUMA node directory. - - For example, the following symlink is created for cpu42 - in NUMA node 2: - - /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2 - - -What: /sys/devices/system/cpu/cpu#/node -Date: October 2009 -Contact: Linux memory management mailing list <linux-mm@kvack.org> -Description: Discover NUMA node a CPU belongs to - - When CONFIG_NUMA is enabled, a symbolic link that points - to the corresponding NUMA node directory. - - For example, the following symlink is created for cpu42 - in NUMA node 2: - - /sys/devices/system/cpu/cpu42/node2 -> ../../node/node2 - - -What: /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 -Date: December 2008 -Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -Description: CPU topology files that describe a logical CPU's relationship - to other cores and threads in the same physical package. - - One cpu# directory is created per logical CPU in the system, - e.g. /sys/devices/system/cpu/cpu42/. - - Briefly, the files above are: - - core_id: the CPU core ID of cpu#. Typically it is the - hardware platform's identifier (rather than the kernel's). - The actual value is architecture and platform dependent. - - core_siblings: internal kernel map of cpu#'s hardware threads - within the same physical_package_id. - - core_siblings_list: human-readable list of the logical CPU - numbers within the same physical_package_id as cpu#. - - physical_package_id: physical package id of cpu#. Typically - corresponds to a physical socket number, but the actual value - is architecture and platform dependent. - - thread_siblings: internel kernel map of cpu#'s hardware - threads within the same core as cpu# - - thread_siblings_list: human-readable list of cpu#'s hardware - threads within the same core as cpu# - - See Documentation/cputopology.txt for more information. - - -What: /sys/devices/system/cpu/cpuidle/current_driver - /sys/devices/system/cpu/cpuidle/current_governer_ro -Date: September 2007 -Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -Description: Discover cpuidle policy and mechanism - - Various CPUs today support multiple idle levels that are - differentiated by varying exit latencies and power - consumption during idle. - - Idle policy (governor) is differentiated from idle mechanism - (driver) - - current_driver: displays current idle mechanism - - current_governor_ro: displays current idle policy - - See files in Documentation/cpuidle/ for more information. - - -What: /sys/devices/system/cpu/cpu#/cpufreq/* -Date: pre-git history -Contact: cpufreq@vger.kernel.org -Description: Discover and change clock speed of CPUs - - Clock scaling allows you to change the clock speed of the - CPUs on the fly. This is a nice method to save battery - power, because the lower the clock speed, the less power - the CPU consumes. - - There are many knobs to tweak in this directory. - - See files in Documentation/cpu-freq/ for more information. - - In particular, read Documentation/cpu-freq/user-guide.txt - to learn how to control the knobs. - - -What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} -Date: August 2008 -KernelVersion: 2.6.27 -Contact: discuss@x86-64.org -Description: Disable L3 cache indices - - These files exist in every CPU's cache/index3 directory. Each - cache_disable_{0,1} file corresponds to one disable slot which - can be used to disable a cache index. Reading from these files - on a processor with this functionality will return the currently - disabled index for that node. There is one L3 structure per - node, or per internal node on MCM machines. Writing a valid - index to one of these files will cause the specificed cache - index to be disabled. - - All AMD processors with L3 caches provide this functionality. - For details, see BKDGs at - http://developer.amd.com/documentation/guides/Pages/default.aspx |