Documentation/ABI/testing/sysfs-kernel-mm-ksm

   1 What:           /sys/kernel/mm/ksm
   2 Date:           September 2009
   3 KernelVersion:  2.6.32
   4 Contact:        Linux memory management mailing list <linux-mm@kvack.org>
   5 Description:    Interface for Kernel Samepage Merging (KSM)
   6
   7 What:           /sys/kernel/mm/ksm/full_scans
   8 What:           /sys/kernel/mm/ksm/pages_shared
   9 What:           /sys/kernel/mm/ksm/pages_sharing
  10 What:           /sys/kernel/mm/ksm/pages_to_scan
  11 What:           /sys/kernel/mm/ksm/pages_unshared
  12 What:           /sys/kernel/mm/ksm/pages_volatile
  13 What:           /sys/kernel/mm/ksm/run
  14 What:           /sys/kernel/mm/ksm/sleep_millisecs
  15 Date:           September 2009
  16 Contact:        Linux memory management mailing list <linux-mm@kvack.org>
  17 Description:    Kernel Samepage Merging daemon sysfs interface
  18
  19                 full_scans: how many times all mergeable areas have been
  20                 scanned.
  21
  22                 pages_shared: how many shared pages are being used.
  23
  24                 pages_sharing: how many more sites are sharing them i.e. how
  25                 much saved.
  26
  27                 pages_to_scan: how many present pages to scan before ksmd goes
  28                 to sleep.
  29
  30                 pages_unshared: how many pages unique but repeatedly checked
  31                 for merging.
  32
  33                 pages_volatile: how many pages changing too fast to be placed
  34                 in a tree.
  35
  36                 run: write 0 to disable ksm, read 0 while ksm is disabled.
  37
  38                         - write 1 to run ksm, read 1 while ksm is running.
  39                         - write 2 to disable ksm and unmerge all its pages.
  40
  41                 sleep_millisecs: how many milliseconds ksm should sleep between
  42                 scans.
  43
  44                 See Documentation/vm/ksm.rst for more information.
  45
  46 What:           /sys/kernel/mm/ksm/merge_across_nodes
  47 Date:           January 2013
  48 KernelVersion:  3.9
  49 Contact:        Linux memory management mailing list <linux-mm@kvack.org>
  50 Description:    Control merging pages across different NUMA nodes.
  51
  52                 When it is set to 0 only pages from the same node are merged,
  53                 otherwise pages from all nodes can be merged together (default).