> This change fixes a long standing performance issue related to the debugger 
> single stepping that is using JVMTI `FramePop` events as a part of step over 
> handling. The performance issue is that the target thread continues its 
> execution in very slow `interp-only` mode in a context of frame marked for 
> `FramePop` notification with the JVMTI `NotifyFramePop`. It includes other 
> method calls recursively upon a return from the frame.
> 
> This fix is to avoid enabling the `interp-only` mode for threads when 
> `FramePop` events are enabled with JVMTI `SetEventNotificationMode`. Instead, 
> the target frame has been deoptimized and kept interpreted by disabling `OSR` 
> in the function `InterpreterRuntime::frequency_counter_overflow_inner()`. 
> Additionally, some tweaks are applied in several places where the 
> `java_thread->is_interp_only_mode()` is checked.
> The other details will be provided in the first PR request comment.
> It is considered to file a SCR for this update a `FramePop` events do not 
> enforce the `interp-only` mode for a target thread anymore which might break 
> some expectations (the behavior has been changed).
> 
> Testing:
>  - test `serviceability/jvmti/vthread/ThreadStateTest` was updated to provide 
> some extra test coverage
>  - submitted mach5 tiers 1-6

Serguei Spitsyn has updated the pull request incrementally with one additional 
commit since the last revision:

  cleanup: removed an old code fragment in frame.cpp

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28407/files
  - new: https://git.openjdk.org/jdk/pull/28407/files/d31aefb6..b3cffe5a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28407&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28407&range=00-01

  Stats: 14 lines in 1 file changed: 0 ins; 14 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28407.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28407/head:pull/28407

PR: https://git.openjdk.org/jdk/pull/28407

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