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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>
53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
What: /sys/kernel/mm/ksm
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Date: September 2009
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KernelVersion: 2.6.32
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Contact: Linux memory management mailing list <linux-mm@kvack.org>
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Description: Interface for Kernel Samepage Merging (KSM)
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What: /sys/kernel/mm/ksm/full_scans
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What: /sys/kernel/mm/ksm/pages_shared
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What: /sys/kernel/mm/ksm/pages_sharing
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What: /sys/kernel/mm/ksm/pages_to_scan
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What: /sys/kernel/mm/ksm/pages_unshared
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What: /sys/kernel/mm/ksm/pages_volatile
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What: /sys/kernel/mm/ksm/run
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What: /sys/kernel/mm/ksm/sleep_millisecs
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Date: September 2009
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Contact: Linux memory management mailing list <linux-mm@kvack.org>
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Description: Kernel Samepage Merging daemon sysfs interface
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full_scans: how many times all mergeable areas have been
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scanned.
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pages_shared: how many shared pages are being used.
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pages_sharing: how many more sites are sharing them i.e. how
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much saved.
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pages_to_scan: how many present pages to scan before ksmd goes
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to sleep.
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pages_unshared: how many pages unique but repeatedly checked
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for merging.
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pages_volatile: how many pages changing too fast to be placed
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in a tree.
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run: write 0 to disable ksm, read 0 while ksm is disabled.
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write 1 to run ksm, read 1 while ksm is running.
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write 2 to disable ksm and unmerge all its pages.
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sleep_millisecs: how many milliseconds ksm should sleep between
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scans.
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See Documentation/vm/ksm.txt for more information.
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What: /sys/kernel/mm/ksm/merge_across_nodes
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Date: January 2013
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KernelVersion: 3.9
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Contact: Linux memory management mailing list <linux-mm@kvack.org>
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Description: Control merging pages across different NUMA nodes.
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When it is set to 0 only pages from the same node are merged,
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otherwise pages from all nodes can be merged together (default).
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