74 lines
2.9 KiB
Plaintext
74 lines
2.9 KiB
Plaintext
|
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
|
||
|
|
|