RFR: 8311248: Refactor CodeCache::initialize_heaps to simplify adding new CodeCache segments [v8]

[Evgeny Astigeevich]

On Tue, 20 Feb 2024 13:26:22 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:

>> These changes clean up the logic and the code of allocating codecache segments and add more testing of it, to open a door for further optimization of code cache segmentation.  The goal was to keep the behavior as close to the existing behavior as possible, even if it's not quite logical.
>> 
>> Also, these changes better account for alignment - PrintFlagsFinal shows the final aligned segment sizes, and the segments fill the ReservedCodeCacheSize without gaps caused by alignment.
>
> Boris Ulasevich has updated the pull request incrementally with one additional commit since the last revision:
> 
>   one another cleanup round

src/hotspot/share/code/codeCache.cpp line 197:

> 195: };
> 196: 
> 197: static void set_size_of_unset_code_heap(CodeHeapInfo* heap, size_t available_size, size_t known_segments_size, size_t min_size) {

Suggest renaming: `known_segments_size` -> `used_size`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17244#discussion_r1496667518