Integrated: 8343953: Test jdk/jfr/threading/TestDeepVirtualStackTrace.java fails with Parallel/Serial GC

[Leonid Mesnik]

On Wed, 13 Nov 2024 00:33:49 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> 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.

This pull request has now been integrated.

Changeset: 68164a48
Author:    Leonid Mesnik <lmesnik at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/68164a4847bc309a09701162528b4469660a58f0
Stats:     4 lines in 1 file changed: 2 ins; 0 del; 2 mod

8343953: Test jdk/jfr/threading/TestDeepVirtualStackTrace.java fails with Parallel/Serial GC

Reviewed-by: mli

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