| What: /sys/devices/system/memory | |
| Date: June 2008 | |
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| Description: | |
| The /sys/devices/system/memory contains a snapshot of the | |
| internal state of the kernel memory blocks. Files could be | |
| added or removed dynamically to represent hot-add/remove | |
| operations. | |
| Users: hotplug memory add/remove tools | |
| https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| What: /sys/devices/system/memory/memoryX/removable | |
| Date: June 2008 | |
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| Description: | |
| The file /sys/devices/system/memory/memoryX/removable | |
| indicates whether this memory block is removable or not. | |
| This is useful for a user-level agent to determine | |
| identify removable sections of the memory before attempting | |
| potentially expensive hot-remove memory operation | |
| Users: hotplug memory remove tools | |
| https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| What: /sys/devices/system/memory/memoryX/phys_device | |
| Date: September 2008 | |
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| Description: | |
| The file /sys/devices/system/memory/memoryX/phys_device | |
| is read-only and is designed to show the name of physical | |
| memory device. Implementation is currently incomplete. | |
| What: /sys/devices/system/memory/memoryX/phys_index | |
| Date: September 2008 | |
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| Description: | |
| The file /sys/devices/system/memory/memoryX/phys_index | |
| is read-only and contains the section ID in hexadecimal | |
| which is equivalent to decimal X contained in the | |
| memory section directory name. | |
| What: /sys/devices/system/memory/memoryX/state | |
| Date: September 2008 | |
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | |
| Description: | |
| The file /sys/devices/system/memory/memoryX/state | |
| is read-write. When read, it's contents show the | |
| online/offline state of the memory section. When written, | |
| root can toggle the the online/offline state of a removable | |
| memory section (see removable file description above) | |
| using the following commands. | |
| # echo online > /sys/devices/system/memory/memoryX/state | |
| # echo offline > /sys/devices/system/memory/memoryX/state | |
| For example, if /sys/devices/system/memory/memory22/removable | |
| contains a value of 1 and | |
| /sys/devices/system/memory/memory22/state contains the | |
| string "online" the following command can be executed by | |
| by root to offline that section. | |
| # echo offline > /sys/devices/system/memory/memory22/state | |
| Users: hotplug memory remove tools | |
| https://w3.opensource.ibm.com/projects/powerpc-utils/ | |
| What: /sys/devices/system/node/nodeX/memoryY | |
| Date: September 2008 | |
| Contact: Gary Hade <garyhade@us.ibm.com> | |
| Description: | |
| When CONFIG_NUMA is enabled | |
| /sys/devices/system/node/nodeX/memoryY is a symbolic link that | |
| points to the corresponding /sys/devices/system/memory/memoryY | |
| memory section directory. For example, the following symbolic | |
| link is created for memory section 9 on node0. | |
| /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 | |