Integrated: JDK-8322237: Heap dump contains duplicate thread records for mounted virtual threads

[Alex Menkov]

On Sat, 16 Dec 2023 02:15:16 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> HeapDumper dumps virtual threads in 2 places:
> - dumping platform threads (mounted virtual threads are dumped as separate thread object);
> - dumping heap objects when the object is `java.lang.VirtualThread`.
> 
> In the 2nd case mounted virtual threads should be skipped (as they are already dumped with correct stack traces/stack references)
> Check that a virtual thread is mounted is non-trivial, method from JvmtiEnvBase was used for this.
> 
> Testing: tier1..3, heapdump-related tests: open/test/hotspot/jtreg/serviceability,open/test/hotspot/jtreg/runtime/ErrorHandling,open/test/hotspot/jtreg/gc/epsilon,open/test/jdk/sun/tools/jhsdb

This pull request has now been integrated.

Changeset: dd8ae616
Author:    Alex Menkov <amenkov at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/dd8ae616437398f957f9b4f09cf2c7f1d0bd0938
Stats:     35 lines in 2 files changed: 33 ins; 0 del; 2 mod

8322237: Heap dump contains duplicate thread records for mounted virtual threads

Reviewed-by: dholmes, sspitsyn

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PR: https://git.openjdk.org/jdk/pull/17134