RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v5]

[Johannes Bechberger]

On Mon, 26 May 2025 14:44:04 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> The mentioned conversion is from ticks to time unit:
>> 
>> nanos = ticks * 1_000_000_000 / frequency
>> 
>> therefore
>> 
>> nanos / 1_000_000_000 * frequency = ticks
>
> Sorry, you represent the sampling period value as ticks, not nanos. Its a Tickspan after all.
> 
> Does it look right in the jfr parser alt JMC?

It looks good in the jfr tool:


16:56:22      0.112 ms akka.actor.ChildActorPath... UCT-akka.actor.default-di...  false                  2.00 ms  false
16:56:22      0.109 ms akka.actor.ChildActorPath... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.111 ms scala.collection.immutabl... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22     0.0221 ms scala.concurrent.impl.Pro... UCT-akka.actor.default-di...  false                  2.00 ms  false
16:56:22     0.0184 ms scala.collection.immutabl... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.114 ms akka.actor.dungeon.Childr... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.109 ms scala.collection.immutabl... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.113 ms akka.actor.ChildActorPath... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.109 ms akka.actor.dungeon.Childr... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22     0.0197 ms akka.actor.dungeon.Childr... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.108 ms akka.actor.dungeon.Childr... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.109 ms akka.actor.ChildActorPath... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.108 ms java.util.concurrent.Fork... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.111 ms scala.collection.immutabl... UCT-akka.actor.default-di...  false                  1.00 ms  false
16:56:22      0.107 ms scala.collection.immutabl... UCT-akka.actor.internal-d...  false                  1.00 ms  false


But I can't find the event at all in JMC

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2107525890