RFR: 8288474: Move EventContinuationFreezeOld from try_freeze_fast to freeze_slow

[Coleen Phillimore]

On Wed, 14 Sep 2022 12:12:01 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> src/hotspot/share/runtime/continuationFreezeThaw.cpp line 723:
>> 
>>> 721: #if CONT_JFR
>>> 722:   EventContinuationFreezeSlow e;
>>> 723:   if (e.should_commit()) {
>> 
>> Committing the event should happen at the end of the method to measure the time.
>
> That makes sense but the time recorded for these is startTime:
> jdk.ContinuationThawSlow {
>   startTime = 11:54:23.301 (2022-09-14)
>   id = 4260565248
>   eventThread = "MainThread" (javaThreadId = 36)
> }

jdk.ContinuationThawFast {
  startTime = 11:54:23.360 (2022-09-14)
  id = 4259803872
  full = false
  size = 48
  eventThread = "MainThread" (javaThreadId = 36)
}

jdk.ContinuationThaw {
  startTime = 11:54:23.360 (2022-09-14)
  duration = 0.00675 ms
  carrierThread = "MainThread" (javaThreadId = 36)
  continuationClass = Fuzz$2 (classLoader = app)
  interpretedFrames = 0
  size = 64 bytes
  eventThread = "MainThread" (javaThreadId = 36)
}

Also the fast version is start time.  The duration is reported for the non Fast/Slow events.

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PR: https://git.openjdk.org/jdk/pull/10254