RFR: 8329351: add runtime/Monitor/TestRecursiveLocking.java for recursive Java monitor stress testing

[Daniel D. Daugherty]

On Thu, 11 Apr 2024 23:08:10 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> The first stress test to be added is:
>> 
>> runtime/Monitor/TestRecursiveLocking.java
>> 
>> It has been tested with a couple of 12 hour runs on my MBP13:
>>   - 3 build configs: release, fastdebug, slowdebug, 4 hours each, total 12 hours
>>   - 18 test configs, 800 seconds each, total 4 hours
>> 
>> The default configuration has been tested in Mach5 Tier2 and the
>> StressWrapper_TestRecursiveLocking_36M.java version has been
>> tested in Mach5 Tier3.
>
> test/hotspot/jtreg/runtime/Monitor/TestRecursiveLocking.java line 255:
> 
>> 253:             }
>> 254:             if (LockingMode != LM_LEGACY) {
>> 255:                 assertInflated();
> 
> Legacy isn't inflated because it's recursive?  Can you add a comment why? It would help if something changes and the test starts failing to help whoever breaks this.

I'm adding comments for most of the assertions.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18664#discussion_r1571434679