From owner-freebsd-current@freebsd.org  Wed Apr  7 19:43:04 2021
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From: Andriy Gapon <avg@FreeBSD.org>
Subject: stable/13, vm page counts do not add up
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I regularly see that the top's memory line does not add up (and by a lot).
That can be seen with vm.stats as well.

For example:
$ sysctl vm.stats | fgrep count
vm.stats.vm.v_cache_count: 0
vm.stats.vm.v_user_wire_count: 3231
vm.stats.vm.v_laundry_count: 262058
vm.stats.vm.v_inactive_count: 3054178
vm.stats.vm.v_active_count: 621131
vm.stats.vm.v_wire_count: 1871176
vm.stats.vm.v_free_count: 187777
vm.stats.vm.v_page_count: 8134982

$ bc
>>> 187777 + 1871176 + 621131 + 3054178 + 262058
5996320
>>> 8134982 - 5996320
2138662

As you can see, it's not a small number of pages either.
Approximately 2 million pages, 8 gigabytes or 25% of the whole memory on this
system.

This is 47c00a9835926e96, 13.0-STABLE amd64.
I do not think that I saw anything like that when I used (much) older FreeBSD.

-- 
Andriy Gapon