RFR: 8356698: JFR: @Contextual

[Markus Grönlund]

On Sun, 1 Jun 2025 21:46:23 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> I think it can be useful if a contextual GUI is created where users can drill down into tables and see all events that occur during a method call. For example, if you want to troubleshoot a slow login:
> 
> ```
> $ java -XX:StartFlightRecording:method-trace=LoginService::login ...
> ```
> 
> Context Types
> Order::id
> **MethodTrace::method** (selected)
> Trace::id
> Trace::name
> Start Time 	Duration 	Context Values
> 20:05:02.10 	5.0 s 	**LoginService::login(String, String)** (selected)
> 20:05:08.10 	80 ms 	**LoginService::login(String, String)**
> 20:05:10.10 	75 ms 	**LoginService::login(String, String)**
> Start Time 	Event Name 	Duration
> 20:05:02.45 	Java Monitor Enter 	25 ms
> 20:05:03.12 	JDBC Execute Query 	4.7 s
> 
> or some other known aspect of the program that has been problematic in the past and now have been annotated, for example:
> 
> ```
> $ java -XX:StartFlightRecording:method-trace=@com.example.UpdateOrder ...
> ```

I could not agree more.

A GUI picking up these innovations, making them conveniently accessible and easily understandable to the end user would be fantastic.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/25249#discussion_r2120658143