Hugh Dickins [off-list ref] writes:

KSM chooses to show the numbers pages_shared and pages_sharing as
exclusive counts: pages_sharing indicates the saving being made.  So it
would be perfectly reasonable to add those two numbers together to get
the "total" number of pages sharing, the number you expected it to show;
but it doesn't make sense to subtract shared from sharing.

Hi. Many thanks for your helpful and detailed explanation. I've fixed our
monitoring to correctly use just pages_sharing to measure the savings. I
think I just assumed the meanings of pages_shared and pages_sharing from
their names. This means that ksm has been saving even more memory than we
thought on our hosts in the past!

Best wishes,

Chris.

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