[Bug 242427] pmap_remove() sometimes is very slow causing 10+ minutes long reboots

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242427

--- Comment #5 from Konstantin Belousov <kib at FreeBSD.org> ---
I am sure that you are detecting the edge of second and not the actual sleeping
place.  It probably something that happens once in second (some callout) which
allows the system to make the progress.

Use precise timing functions like getnanouptime() to find the slow calls.

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