markj 35e385af34 Use a dedicated counter for inactive queue scans.
The laundry thread keeps track of the number of inactive queue scans
performed by the page daemon, and was previously using the v_pdwakeups
counter to count them. However, in some cases the inactive queue may
be scanned multiple times after a single wakeup, so it's more accurate
to use a dedicated counter.

Reviewed by:	alc, kib (previous version)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D13422
2017-12-11 15:33:24 +00:00
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