RFR: 8355003: Implement Ahead-of-Time Method Profiling

[Igor Veresov]

On Sat, 26 Apr 2025 22:42:02 GMT, Vladimir Kozlov <kvn 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
>
> src/hotspot/share/oops/trainingData.cpp line 76:
> 
>> 74: 
>> 75: static void verify_archived_entry(TrainingData* td, const TrainingData::Key* k) {
>> 76:   guarantee(TrainingData::Key::can_compute_cds_hash(k), "");
> 
> Should we gracefully disable using TD instead of crashing VM?

But this is a verification code. That seems to be the usual strategy, is it not?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24886#discussion_r2061847152