RFR: 8364973: Add JVMTI stress testing mode [v3]

[Leonid Mesnik]

On Mon, 11 Aug 2025 09:35:09 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed makefiles
>
> make/RunTests.gmk line 881:
> 
>> 879: 
>> 880:   ifneq ($$(JTREG_JVMTI_STRESS_AGENT), )
>> 881:     AGENT := $$(LIBRARY_PREFIX)JvmtiStressAgent$$(SHARED_LIBRARY_SUFFIX)=$$(JTREG_JVMTI_STRESS_AGENT)
> 
> I don't understand the usage scenario here. Are you supposed to run this like `make test JTREG=JVMTI_STRESS_AGENT=true`? If so, this will result in `-javaoption:'-agentpath:<test-image>/hotspot/jtreg/native/libJvmtiStressAgent.so=true` being sent to jtreg, and that looks sus. 
> 
> Or how should this be used? 
> 
> In fact, this option should be described in testing.md.

This is a jtreg agent options, I use it like
JTREG_JVMTI_STRESS_AGENT=debugger=false
or
JTREG_JVMTI_STRESS_AGENT=debugger=true,verbose
Any of options enable jvmti agent and parsed by it. 
I don't want to add 2 options, for hits. The JTREG_JVMTI_STRESS_AGENT=false doesn't make any sense. 

The options are defined by stress agent while makefile just propagate them to the agent.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26360#discussion_r2267818671