[Bug 280846] Low memory freezes / OOM: a thread waited too long to allocate a page

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280846

--- Comment #49 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to commit-hook from comment #48)

Previous(/current) descriptions :

vm.domain.0.stats.laundpdpgs: Laundry pages scanned by the page daemon
vm.domain.0.stats.laundry: laundry pages
vm.domain.0.stats.unswappable: Unswappable pages
vm.domain.0.stats.unswppdpgs: Unswappable pages scanned by the page daemon

More accurate ones for comparison/contrast (if I've understood right)? :

vm.domain.0.stats.laundpdpgs: Swappable Laundry pages scanned by the page
daemon
vm.domain.0.stats.laundry: Swappable+Unswappable laundry pages
vm.domain.0.stats.unswappable: Unswappable pages
vm.domain.0.stats.unswppdpgs: Unswappable pages scanned by the page daemon

vm.domain.0.stats.laundpdpgs is actually unchanged but in
the new context the original description is highly
ambiguous via it not matching vm.domain.0.stats.laundry .

To estimate the old vm.domain.0.stats.laundry value
(just Swappable) requires subtraction in the new
context. Also:

vm.domain.0.stats.laundry+vm.domain.0.stats.unswappable

should not be used in the new context (avoiding double
counting of unswappable).

The proposed wording suggests those points.

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