[Bug 187594] [zfs] [patch] ZFS ARC behavior problem and fix

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594

Steven Hartland <smh at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |smh at FreeBSD.org

--- Comment #26 from Steven Hartland <smh at FreeBSD.org> ---
I've actually been looking at this patch today in relation to my investigation
of:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191510

I would appreciate it if people could test the attached patch, which was
created against stable/10

It should achieve the same as Karl's patch as well as:
* More closely matching original Solaris logic
* Provide better control of the reclaim trigger (absolute not percentage based,
which becomes a problem in larger memory machines)
* Uses direct kernel values instead of interfacing via sysctl's.
* Should fix the issue identified in #191510 as well.

Basic design is it will trigger ARC reclaim when free pages drops below
vfs.zfs.arc_free_target, which by default is 3 x that of the VM's target free
pages as exposed by vm.v_free_target (matching Solaris).

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