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ksm: add some comments

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Added slightly more detail to the Documentation of merge_across_nodes, a
few comments in areas indicated by review, and renamed get_ksm_page()'s
argument from "locked" to "lock_it".  No functional change.

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Petr Holasek <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Izik Eidus <[email protected]>
Cc: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2013-02-22 16:36:03 -08:00 • committed by Linus Torvalds
commit 8fdb3dbf02
2 changed files with 26 additions and 8 deletions
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16
Documentation/vm/ksm.txt
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@ -60,10 +60,18 @@ sleep_millisecs - how many milliseconds ksmd should sleep before next scan
merge_across_nodes - specifies if pages from different numa nodes can be merged.
When set to 0, ksm merges only pages which physically
reside in the memory area of same NUMA node. It brings
lower latency to access to shared page. Value can be
changed only when there is no ksm shared pages in system.
Default: 1
reside in the memory area of same NUMA node. That brings
lower latency to access of shared pages. Systems with more
nodes, at significant NUMA distances, are likely to benefit
from the lower latency of setting 0. Smaller systems, which
need to minimize memory usage, are likely to benefit from
the greater sharing of setting 1 (default). You may wish to
compare how your system performs under each setting, before
deciding on which to use. merge_across_nodes setting can be
changed only when there are no ksm shared pages in system:
set run 2 to unmerge pages first, then to 1 after changing
merge_across_nodes, to remerge according to the new setting.
Default: 1 (merging across nodes as in earlier releases)
run - set 0 to stop ksmd from running but keep merged pages,
set 1 to run ksmd e.g. "echo 1 > /sys/kernel/mm/ksm/run",