[Bug 275594] High CPU usage by arc_prune; analysis and fix

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275594

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open

--- Comment #3 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Seigo Tanimura from comment #2)
Does arc_prune stop running once the build finishes?  The problem that
EN-23:18.openzfs tries to address is that arc_prune will continue endlessly,
even when the system is idle and there is no pressure for free memory or
vnodes.

arc_prune_async() is rather dumb on FreeBSD, as you point out: it tries to
reclaim vnodes from the global free list, but doing so might not alleviate
pressure.  Really we want some way to shrink a per-mountpoint or per-filesystem
cache.

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