RFR: 8346920: Serial: Support allocation in old generation before GC [v2]

[Guoxiong Li]

On Mon, 6 Jan 2025 14:37:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> src/hotspot/share/gc/serial/serialHeap.cpp line 334:
>> 
>>> 332: 
>>> 333:       bool first_only = !should_try_older_generation_allocation(size)
>>> 334:                      && is_long_enough_from_prev_gc_pause_end();
>> 
>> Is the `first_only` actually `young_only`? It means that the allocation is only attempted in young generation?
>
> That's true. I believe Serial used to support >2 generations, so some generic names are left as is. Fixing it requires updating in multiple places, such as the method name `older_generation`, arg in `attempt_allocation`, etc. How about we do that invasive but pure refactoring in its own PR?

Yes, such refactoring should be finished in other issues.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22899#discussion_r1904984586