mirror of
https://github.com/torvalds/linux
synced 2024-07-22 11:10:46 +00:00
d21077fbc2
This adds the general_profit KSM sysfs knob and the process profit metric knobs to ksm_stat. 1) expose general_profit metric The documentation mentions a general profit metric, however this metric is not calculated. In addition the formula depends on the size of internal structures, which makes it more difficult for an administrator to make the calculation. Adding the metric for a better user experience. 2) document general_profit sysfs knob 3) calculate ksm process profit metric The ksm documentation mentions the process profit metric and how to calculate it. This adds the calculation of the metric. 4) mm: expose ksm process profit metric in ksm_stat This exposes the ksm process profit metric in /proc/<pid>/ksm_stat. The documentation mentions the formula for the ksm process profit metric, however it does not calculate it. In addition the formula depends on the size of internal structures. So it makes sense to expose it. 5) document new procfs ksm knobs Link: https://lkml.kernel.org/r/20230418051342.1919757-3-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: David Hildenbrand <david@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
62 lines
2 KiB
Plaintext
62 lines
2 KiB
Plaintext
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/mm/ksm.rst 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).
|
|
|
|
What: /sys/kernel/mm/ksm/general_profit
|
|
Date: April 2023
|
|
KernelVersion: 6.4
|
|
Contact: Linux memory management mailing list <linux-mm@kvack.org>
|
|
Description: Measure how effective KSM is.
|
|
general_profit: how effective is KSM. The formula for the
|
|
calculation is in Documentation/admin-guide/mm/ksm.rst.
|