RFR: 8368740: Serial: Swap eden and survivor spaces position in young generation [v2]

[Francesco Andreuzzi]

On Fri, 26 Sep 2025 09:34:16 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> src/hotspot/share/gc/serial/defNewGeneration.cpp line 426:
>> 
>>> 424:       return;
>>> 425:     }
>>> 426:   } else {
>> 
>> How about `else if (current_young_gen_size_bytes > desired_young_gen_size_bytes)` here? `VirtualSpace::shrink_by(size_t)` seems to do some work even when `delta_bytes = 0`.
>
> The zero-case is handled a few lines above by `if (current_young_gen_size_bytes == desired_young_gen_size_bytes)`.

Missed that, thanks

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PR Review Comment: https://git.openjdk.org/jdk/pull/27513#discussion_r2382438178