RFR: 8343953: Test jdk/jfr/threading/TestDeepVirtualStackTrace.java fails with Parallel/Serial GC [v2]

[Leonid Mesnik]

> Test fails because it doesn't always trigger jdk.ObjectAllocationOutsideTLAB event.
> 
> Test tries to trigger jdk.ObjectAllocationOutsideTLAB by allocating 
> new Object[10_000_000];
> array.
> 
> However, the TLAB is not limited for Parallel/Serial/Z GCs. So VM might just increase TLAB and allocate the array in new TLAB. The fix limit young generation size to ensure that TLAB of expected size can't be created and
>  jdk.ObjectAllocationOutsideTLAB  event is always generated.
> Verified by running 100 times with Parallel/Serial/ZGC on different platforms.
> 
> Using  jdk.ObjectAllocationOutsideTLAB is not  the signifcant for the test. The better fix would be trigger some other event with 100% guarantee assuming that this event is not triggered outside of virtual thread. But not sure I which event is the good candidate.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  added comment

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22052/files
  - new: https://git.openjdk.org/jdk/pull/22052/files/ac0542d0..95562045

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22052&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22052&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22052.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22052/head:pull/22052

PR: https://git.openjdk.org/jdk/pull/22052