Mark Johnston 6068486258 Fix the background laundering mechanism after r329882.
Rather than using the number of inactive queue scans as a metric for
how many clean pages are being freed by the page daemon, have the
page daemon keep a running counter of the number of pages it has freed,
and have the laundry thread use that when computing the background
laundering threshold.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D14884
2018-03-29 14:27:40 +00:00
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