projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5c755e9f BP |
1 | What: /sys/devices/system/memory |
| 2 | Date: June 2008 | |
| 3 | Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| 4 | Description: | |
| 5 | The /sys/devices/system/memory contains a snapshot of the | |
| 6 | internal state of the kernel memory blocks. Files could be | |
| 7 | added or removed dynamically to represent hot-add/remove | |
| 8 | operations. | |
| 5c755e9f BP |
9 | Users: hotplug memory add/remove tools |
| 10 | https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| 11 | ||
| 12 | What: /sys/devices/system/memory/memoryX/removable | |
| 13 | Date: June 2008 | |
| 14 | Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| 15 | Description: | |
| 16 | The file /sys/devices/system/memory/memoryX/removable | |
| 17 | indicates whether this memory block is removable or not. | |
| 18 | This is useful for a user-level agent to determine | |
| 19 | identify removable sections of the memory before attempting | |
| 20 | potentially expensive hot-remove memory operation | |
| c04fc586 GH |
21 | Users: hotplug memory remove tools |
| 22 | https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| 23 | ||
| 24 | What: /sys/devices/system/memory/memoryX/phys_device | |
| 25 | Date: September 2008 | |
| 26 | Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| 27 | Description: | |
| 28 | The file /sys/devices/system/memory/memoryX/phys_device | |
| 29 | is read-only and is designed to show the name of physical | |
| 30 | memory device. Implementation is currently incomplete. | |
| 5c755e9f | 31 | |
| c04fc586 GH |
32 | What: /sys/devices/system/memory/memoryX/phys_index |
| 33 | Date: September 2008 | |
| 34 | Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| 35 | Description: | |
| 36 | The file /sys/devices/system/memory/memoryX/phys_index | |
| 37 | is read-only and contains the section ID in hexadecimal | |
| 38 | which is equivalent to decimal X contained in the | |
| 39 | memory section directory name. | |
| 40 | ||
| 41 | What: /sys/devices/system/memory/memoryX/state | |
| 42 | Date: September 2008 | |
| 43 | Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| 44 | Description: | |
| 45 | The file /sys/devices/system/memory/memoryX/state | |
| 46 | is read-write. When read, it's contents show the | |
| 47 | online/offline state of the memory section. When written, | |
| 48 | root can toggle the the online/offline state of a removable | |
| 49 | memory section (see removable file description above) | |
| 50 | using the following commands. | |
| 51 | # echo online > /sys/devices/system/memory/memoryX/state | |
| 52 | # echo offline > /sys/devices/system/memory/memoryX/state | |
| 53 | ||
| 54 | For example, if /sys/devices/system/memory/memory22/removable | |
| 55 | contains a value of 1 and | |
| 56 | /sys/devices/system/memory/memory22/state contains the | |
| 57 | string "online" the following command can be executed by | |
| 58 | by root to offline that section. | |
| 59 | # echo offline > /sys/devices/system/memory/memory22/state | |
| 5c755e9f BP |
60 | Users: hotplug memory remove tools |
| 61 | https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| c04fc586 GH |
62 | |
| 63 | What: /sys/devices/system/node/nodeX/memoryY | |
| 64 | Date: September 2008 | |
| 65 | Contact: Gary Hade <garyhade@us.ibm.com> | |
| 66 | Description: | |
| 67 | When CONFIG_NUMA is enabled | |
| 68 | /sys/devices/system/node/nodeX/memoryY is a symbolic link that | |
| 69 | points to the corresponding /sys/devices/system/memory/memoryY | |
| 70 | memory section directory. For example, the following symbolic | |
| 71 | link is created for memory section 9 on node0. | |
| 72 | /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 | |
| 73 |