projects / linux-2.6-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 | 9 | Users: hotplug memory add/remove tools |
| 0ea6e611 | 10 | http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils |
| 5c755e9f BP |
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 | 21 | Users: hotplug memory remove tools |
| 0ea6e611 | 22 | http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils |
| c04fc586 GH |
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 | |
| a33f3224 | 46 | is read-write. When read, its contents show the |
| c04fc586 GH |
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 | 60 | Users: hotplug memory remove tools |
| 0ea6e611 | 61 | http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils |
| c04fc586 | 62 | |
| dee5d0d5 | 63 | |
| ed2f2400 ZZ |
64 | What: /sys/devices/system/memory/memoryX/valid_zones |
| 65 | Date: July 2014 | |
| 66 | Contact: Zhang Zhen <zhenzhang.zhang@huawei.com> | |
| 67 | Description: | |
| 68 | The file /sys/devices/system/memory/memoryX/valid_zones is | |
| 69 | read-only and is designed to show which zone this memory | |
| 70 | block can be onlined to. | |
| 71 | ||
| dee5d0d5 AC |
72 | What: /sys/devices/system/memoryX/nodeY |
| 73 | Date: October 2009 | |
| 74 | Contact: Linux Memory Management list <linux-mm@kvack.org> | |
| 75 | Description: | |
| 76 | When CONFIG_NUMA is enabled, a symbolic link that | |
| 77 | points to the corresponding NUMA node directory. | |
| 78 | ||
| 79 | For example, the following symbolic link is created for | |
| 80 | memory section 9 on node0: | |
| 81 | /sys/devices/system/memory/memory9/node0 -> ../../node/node0 | |
| 82 | ||
| 83 | ||
| c04fc586 GH |
84 | What: /sys/devices/system/node/nodeX/memoryY |
| 85 | Date: September 2008 | |
| 86 | Contact: Gary Hade <garyhade@us.ibm.com> | |
| 87 | Description: | |
| 88 | When CONFIG_NUMA is enabled | |
| 89 | /sys/devices/system/node/nodeX/memoryY is a symbolic link that | |
| 90 | points to the corresponding /sys/devices/system/memory/memoryY | |
| 91 | memory section directory. For example, the following symbolic | |
| 92 | link is created for memory section 9 on node0. | |
| 93 | /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 |