| Alex Chiang | 2ceb3fb | 2009-10-21 21:45:20 -0600 | [diff] [blame] | 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 | |
| Alex Chiang | d93fc86 | 2009-10-21 21:45:25 -0600 | [diff] [blame^] | 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 | |
| Mark Langsdorf | 2fad2d9 | 2009-04-09 15:31:53 +0200 | [diff] [blame] | 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 |