RFR: 8355003: Implement JEP 515: Ahead-of-Time Method Profiling [v14]

[Ioi Lam]

On Tue, 6 May 2025 21:50:34 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> Improve warm-up time by making profile data from a previous run of an application instantly available, when the HotSpot Java Virtual Machine starts. Specifically, enhance the [AOT cache](https://openjdk.org/jeps/483) to store method execution profiles from training runs, reducing profiling delays in subsequent production runs.
>> 
>> More details in the JEP: https://bugs.openjdk.org/browse/JDK-8325147
>
> Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

LGTM. Small nits about logging and testing.

src/hotspot/share/cds/filemap.cpp line 1955:

> 1953:                     " does not equal the current SpecTrapLimitExtraEntries setting (%d).", file_type,
> 1954:                     _spec_trap_limit_extra_entries, SpecTrapLimitExtraEntries);
> 1955:       return false;

The `log_info(cds)` should be replaced with `MetaspaceShared::report_loading_error`.  (The few `log_info` lines above this block will be fixed in [JDK-8356807](https://bugs.openjdk.org/browse/JDK-8356807))

Also, could you add a new jtreg test case for this? You can see examples in `negativeTests` in the existing AOTFlags.java test case. I think you can add your checks into the new AOTProfileFlags.java test.

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Marked as reviewed by iklam (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24886#pullrequestreview-2833939411
PR Review Comment: https://git.openjdk.org/jdk/pull/24886#discussion_r2085115469