RFR: 8367754: G1: Add a fast path in heap resize related method [v3]

[Thomas Schatzl]

On Thu, 18 Sep 2025 13:16:04 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> > ... thereby avoiding unnecessary computation
> 
> That's absolutely true; however, the real expensive part is not the calculation but actual resizing (commit/uncommit).
> 
> Since the existing logic is not simplified by the use of early-return, I feel it hinders readability slightly. I wonder what others think.

I agree with the evaluation where the actual costs are. I think the intent of the change is fine, although not absolutely necessary. That is why I suggested to avoid the new member variable. I am good either way (drop or keep) though.

Thomas

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PR Comment: https://git.openjdk.org/jdk/pull/27349#issuecomment-3311543910