On Thu, 18 May 2023 20:35:47 GMT, Chris Plummer <cjplum...@openjdk.org> wrote:
>> Method post_dynamic_code_generated_while_holding_locks()
>> register stubs and might be called during VTMT transitions.
>> At least it is called in tmp VTMT transition, and stubs might be generated
>> during standard VTMT transition.
>>
>> The method doesn't post event but just register stub for later posting so it
>> might be called during transition.
>>
>> Also, the test has been updated to test virtual threads. It crashed before
>> fix and start passing after fix.
>> Additionally, checked this test with Xcomp, run tier1/tier5 and some stress
>> testing
>
> test/hotspot/jtreg/serviceability/jvmti/DynamicCodeGenerated/DynamicCodeGeneratedTest.java
> line 55:
>
>> 53: Runnable task = () -> {
>> 54: String result = "string" + System.currentTimeMillis();
>> 55: LockSupport.parkNanos(1);
>
> Why is this needed?
It is needed to provoke thread re-mounting to trigger VTMT transitions.
The test wouldn't fail without it.
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PR Review Comment: https://git.openjdk.org/jdk/pull/13921#discussion_r1198287501
