Documentation/ABI/testing/sysfs-memory-page-offline

   1 What:           /sys/devices/system/memory/soft_offline_page
   2 Date:           Sep 2009
   3 KernelVersion:  2.6.33
   4 Contact:        andi@firstfloor.org
   5 Description:
   6                 Soft-offline the memory page containing the physical address
   7                 written into this file. Input is a hex number specifying the
   8                 physical address of the page. The kernel will then attempt
   9                 to soft-offline it, by moving the contents elsewhere or
  10                 dropping it if possible. The kernel will then be placed
  11                 on the bad page list and never be reused.
  12
  13                 The offlining is done in kernel specific granuality.
  14                 Normally it's the base page size of the kernel, but
  15                 this might change.
  16
  17                 The page must be still accessible, not poisoned. The
  18                 kernel will never kill anything for this, but rather
  19                 fail the offline.  Return value is the size of the
  20                 number, or a error when the offlining failed.  Reading
  21                 the file is not allowed.
  22
  23 What:           /sys/devices/system/memory/hard_offline_page
  24 Date:           Sep 2009
  25 KernelVersion:  2.6.33
  26 Contact:        andi@firstfloor.org
  27 Description:
  28                 Hard-offline the memory page containing the physical
  29                 address written into this file. Input is a hex number
  30                 specifying the physical address of the page. The
  31                 kernel will then attempt to hard-offline the page, by
  32                 trying to drop the page or killing any owner or
  33                 triggering IO errors if needed.  Note this may kill
  34                 any processes owning the page. The kernel will avoid
  35                 to access this page assuming it's poisoned by the
  36                 hardware.
  37
  38                 The offlining is done in kernel specific granuality.
  39                 Normally it's the base page size of the kernel, but
  40                 this might change.
  41
  42                 Return value is the size of the number, or a error when
  43                 the offlining failed.
  44                 Reading the file is not allowed.