RFR: Implement JEP 509: JFR CPU-Time Profiling [v46]

[Zhengyu Gu]

On Mon, 5 May 2025 13:18:27 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> src/hotspot/share/runtime/handshake.hpp line 135:
>> 
>>> 133:   bool can_run(bool allow_suspend, bool check_async_exception);
>>> 134: 
>>> 135:   bool has_operation();
>> 
>> `has_operation()` was an inline method, it was called from `SafepointMechanism::should_process()` (now, it calls `can_run`). I believe `SafepointMechanism::should_process()` is a latency sensitive and inlined method.
>
> This seems to lead to a circular dependency.

Hmmm, `has_operation()` was inlined.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r2073458800