linux/Documentation/ABI/testing/sysfs-devices-memory
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   1What:           /sys/devices/system/memory
   2Date:           June 2008
   3Contact:        Badari Pulavarty <pbadari@us.ibm.com>
   4Description:
   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.
   9Users:          hotplug memory add/remove tools
  10                https://w3.opensource.ibm.com/projects/powerpc-utils/
  11
  12What:           /sys/devices/system/memory/memoryX/removable
  13Date:           June 2008
  14Contact:        Badari Pulavarty <pbadari@us.ibm.com>
  15Description:
  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
  21Users:          hotplug memory remove tools
  22                https://w3.opensource.ibm.com/projects/powerpc-utils/
  23
  24What:           /sys/devices/system/memory/memoryX/phys_device
  25Date:           September 2008
  26Contact:        Badari Pulavarty <pbadari@us.ibm.com>
  27Description:
  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.
  31
  32What:           /sys/devices/system/memory/memoryX/phys_index
  33Date:           September 2008
  34Contact:        Badari Pulavarty <pbadari@us.ibm.com>
  35Description:
  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
  41What:           /sys/devices/system/memory/memoryX/state
  42Date:           September 2008
  43Contact:        Badari Pulavarty <pbadari@us.ibm.com>
  44Description:
  45                The file /sys/devices/system/memory/memoryX/state
  46                is read-write.  When read, its 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
  60Users:          hotplug memory remove tools
  61                https://w3.opensource.ibm.com/projects/powerpc-utils/
  62
  63
  64What:           /sys/devices/system/memoryX/nodeY
  65Date:           October 2009
  66Contact:        Linux Memory Management list <linux-mm@kvack.org>
  67Description:
  68                When CONFIG_NUMA is enabled, a symbolic link that
  69                points to the corresponding NUMA node directory.
  70
  71                For example, the following symbolic link is created for
  72                memory section 9 on node0:
  73                /sys/devices/system/memory/memory9/node0 -> ../../node/node0
  74
  75
  76What:           /sys/devices/system/node/nodeX/memoryY
  77Date:           September 2008
  78Contact:        Gary Hade <garyhade@us.ibm.com>
  79Description:
  80                When CONFIG_NUMA is enabled
  81                /sys/devices/system/node/nodeX/memoryY is a symbolic link that
  82                points to the corresponding /sys/devices/system/memory/memoryY
  83                memory section directory.  For example, the following symbolic
  84                link is created for memory section 9 on node0.
  85                /sys/devices/system/node/node0/memory9 -> ../../memory/memory9
  86
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