RFR: 8351594: JFR: Rate-limited sampling of Java events

[Markus Grönlund]

On Fri, 30 May 2025 22:30:25 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Could I have review of an enhancement that adds rate-limited sampling to Java event, including five events in the JDK (SocketRead, SocketWrite, FileRead, FileWrite, and JavaExceptionThrow).
> 
> Testing: test/jdk/jdk/jfr
> 
> Thanks
> Erik

src/jdk.jfr/share/classes/jdk/jfr/internal/EventInstrumentation.java line 257:

> 255:             getEventConfiguration(codeBuilder);
> 256:             codeBuilder.aload(0);
> 257:             getfield(codeBuilder, eventClassDesc, ImplicitFields.FIELD_START_TIME);

In native,we use the endTime for duration events? Is there a need to synchronize the two?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25559#discussion_r2118261907