1 What: /sys/kernel/mm/ksm 1 What: /sys/kernel/mm/ksm
2 Date: September 2009 2 Date: September 2009
3 KernelVersion: 2.6.32 3 KernelVersion: 2.6.32
4 Contact: Linux memory management mailin< 4 Contact: Linux memory management mailing list <linux-mm@kvack.org>
5 Description: Interface for Kernel Samepage 5 Description: Interface for Kernel Samepage Merging (KSM)
6 6
7 What: /sys/kernel/mm/ksm/full_scans 7 What: /sys/kernel/mm/ksm/full_scans
8 What: /sys/kernel/mm/ksm/pages_share 8 What: /sys/kernel/mm/ksm/pages_shared
9 What: /sys/kernel/mm/ksm/pages_shari 9 What: /sys/kernel/mm/ksm/pages_sharing
10 What: /sys/kernel/mm/ksm/pages_to_sc 10 What: /sys/kernel/mm/ksm/pages_to_scan
11 What: /sys/kernel/mm/ksm/pages_unsha 11 What: /sys/kernel/mm/ksm/pages_unshared
12 What: /sys/kernel/mm/ksm/pages_volat 12 What: /sys/kernel/mm/ksm/pages_volatile
13 What: /sys/kernel/mm/ksm/run 13 What: /sys/kernel/mm/ksm/run
14 What: /sys/kernel/mm/ksm/sleep_milli 14 What: /sys/kernel/mm/ksm/sleep_millisecs
15 Date: September 2009 15 Date: September 2009
16 Contact: Linux memory management mailin< 16 Contact: Linux memory management mailing list <linux-mm@kvack.org>
17 Description: Kernel Samepage Merging daemon 17 Description: Kernel Samepage Merging daemon sysfs interface
18 18
19 full_scans: how many times all 19 full_scans: how many times all mergeable areas have been
20 scanned. 20 scanned.
21 21
22 pages_shared: how many shared 22 pages_shared: how many shared pages are being used.
23 23
24 pages_sharing: how many more s 24 pages_sharing: how many more sites are sharing them i.e. how
25 much saved. 25 much saved.
26 26
27 pages_to_scan: how many presen 27 pages_to_scan: how many present pages to scan before ksmd goes
28 to sleep. 28 to sleep.
29 29
30 pages_unshared: how many pages 30 pages_unshared: how many pages unique but repeatedly checked
31 for merging. 31 for merging.
32 32
33 pages_volatile: how many pages 33 pages_volatile: how many pages changing too fast to be placed
34 in a tree. 34 in a tree.
35 35
36 run: write 0 to disable ksm, r 36 run: write 0 to disable ksm, read 0 while ksm is disabled.
37 37
38 - write 1 to run ksm, 38 - write 1 to run ksm, read 1 while ksm is running.
39 - write 2 to disable k 39 - write 2 to disable ksm and unmerge all its pages.
40 40
41 sleep_millisecs: how many mill 41 sleep_millisecs: how many milliseconds ksm should sleep between
42 scans. 42 scans.
43 43
44 See Documentation/mm/ksm.rst f 44 See Documentation/mm/ksm.rst for more information.
45 45
46 What: /sys/kernel/mm/ksm/merge_acros 46 What: /sys/kernel/mm/ksm/merge_across_nodes
47 Date: January 2013 47 Date: January 2013
48 KernelVersion: 3.9 48 KernelVersion: 3.9
49 Contact: Linux memory management mailin< 49 Contact: Linux memory management mailing list <linux-mm@kvack.org>
50 Description: Control merging pages across d 50 Description: Control merging pages across different NUMA nodes.
51 51
52 When it is set to 0 only pages 52 When it is set to 0 only pages from the same node are merged,
53 otherwise pages from all nodes 53 otherwise pages from all nodes can be merged together (default).
54 54
55 What: /sys/kernel/mm/ksm/general_pro 55 What: /sys/kernel/mm/ksm/general_profit
56 Date: April 2023 56 Date: April 2023
57 KernelVersion: 6.4 57 KernelVersion: 6.4
58 Contact: Linux memory management mailin< 58 Contact: Linux memory management mailing list <linux-mm@kvack.org>
59 Description: Measure how effective KSM is. 59 Description: Measure how effective KSM is.
60 general_profit: how effective 60 general_profit: how effective is KSM. The formula for the
61 calculation is in Documentatio 61 calculation is in Documentation/admin-guide/mm/ksm.rst.
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