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ksm: add sysfs ABI Documentation

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Add sysfs documentation for Kernel Samepage Merging (KSM) including new
merge_across_nodes knob.

Signed-off-by: Petr Holasek <pholasek@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Petr Holasek 2013-02-22 16:35:02 -08:00 committed by Linus Torvalds
parent 90bd6fd31c
commit f00dc0ee5a
1 changed files with 52 additions and 0 deletions
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Documentation/ABI/testing/sysfs-kernel-mm-ksm Normal file
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What: /sys/kernel/mm/ksm
Date: September 2009
KernelVersion: 2.6.32
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Interface for Kernel Samepage Merging (KSM)
What: /sys/kernel/mm/ksm/full_scans
What: /sys/kernel/mm/ksm/pages_shared
What: /sys/kernel/mm/ksm/pages_sharing
What: /sys/kernel/mm/ksm/pages_to_scan
What: /sys/kernel/mm/ksm/pages_unshared
What: /sys/kernel/mm/ksm/pages_volatile
What: /sys/kernel/mm/ksm/run
What: /sys/kernel/mm/ksm/sleep_millisecs
Date: September 2009
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Kernel Samepage Merging daemon sysfs interface
full_scans: how many times all mergeable areas have been
scanned.
pages_shared: how many shared pages are being used.
pages_sharing: how many more sites are sharing them i.e. how
much saved.
pages_to_scan: how many present pages to scan before ksmd goes
to sleep.
pages_unshared: how many pages unique but repeatedly checked
for merging.
pages_volatile: how many pages changing too fast to be placed
in a tree.
run: write 0 to disable ksm, read 0 while ksm is disabled.
write 1 to run ksm, read 1 while ksm is running.
write 2 to disable ksm and unmerge all its pages.
sleep_millisecs: how many milliseconds ksm should sleep between
scans.
See Documentation/vm/ksm.txt for more information.
What: /sys/kernel/mm/ksm/merge_across_nodes
Date: January 2013
KernelVersion: 3.9
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Control merging pages across different NUMA nodes.
When it is set to 0 only pages from the same node are merged,
otherwise pages from all nodes can be merged together (default).