RFR: 8330577: G1 sometimes sends jdk.G1HeapRegionTypeChange for non-changes

[Albert Mingkun Yang]

On Fri, 24 May 2024 11:26:57 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that avoids posting Free->Free and Old->Old region transitions in JFR.
> 
> The reason for these could have been:
>   * Free->Free: heap shrinking and full gc
>   * Old->Old: heap shrinking, full gc or evacuation failure in an old region
> 
> Parts of this change has been contributed by @ansteiner , crediting him for this (the first commit).
> 
> Testing: tier1-3, tier5, all "detailed" JFR test cases
> 
> Thanks,
>   Thomas

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19389#pullrequestreview-2077095668