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Commit f00dc0ee authored by Petr Holasek's avatar Petr Holasek Committed by Linus Torvalds
Browse files

ksm: add sysfs ABI Documentation 



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

Signed-off-by: default avatarPetr Holasek <pholasek@redhat.com>
Signed-off-by: default avatarHugh 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 90bd6fd3

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

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+52 −0
Original line number Diff line number Diff line 
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).