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

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

--- Comment #55 from Seigo Tanimura <seigo.tanimura@gmail.com> ---
(In reply to Seigo Tanimura from comment #51)

The test on releng/13.2 has completed with the expected results.


- releng/13.2

  - Date
    - 13 Feb 2024 02:40Z - 13 Feb 2024 11:06Z
  - Build time
    - 08:26:43 (252 pkgs / hr)

  - Failed port(s): 2
    - security/aws-vault: Expected, occasional network problem.
    - japanese/xv: Expected, port Makefile problem?
  - Skipped port(s): 0

  - Result Chart Archive
    - poudriere-bulk-13_2_release-2024-02-13_11h40m00s.7z, Attachment #248437
      - Missing traces
        - The total vnodes.
    - poudriere-bulk-13_2_release-2024-02-13_11h40m00s-zfs.7z, Attachment
#248438
    - poudriere-bulk-13_2_release-2024-02-13_11h40m00s-zfs-sizes.7z, Attachment
#248439
      - Missing traces
        - The total sizes of each ARC states and types. (Data and metadata)

  - The result tendency is the same as releng/14.0 and releng/13.3.


- Version Dependency of Fixes

The fixes for main, stable/14 and releng/14.0 are essentially the same.

The fixes for stable/13 and releng/13.3 have some differences from above
because of the ZFS version difference.

In addition to above, the releng/13.2 fix also has some changes in the VFS.

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