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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. | |
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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 |