Integrated: 8373945: Use WB.fullGC() in ClassUnloader.unloadClass to force GC for vmTestbase tests

[SendaoYan]

On Thu, 18 Dec 2025 08:26:44 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
> 
> This PR use `WhiteBox.getWhiteBox().fullGC()` instead of `eatMemory` to grigger full GC. The OOME trigger by `eatMemory` may cause vmTestbase/nsk/monitoring/stress/classload tests intermittent fails when run those tests simultancely on some machines. The WB.fullGC() might be use for same purpose. It also reduce test execution time.
> 
> Change has been verified locally by running tests vmTestbase/nsk/monitoring/stress/classload on linux-x64.
> 
> Additional testing:
> 
> - [x] All jtreg tests by fastdebug build

This pull request has now been integrated.

Changeset: ce5e0d8a
Author:    SendaoYan <syan at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/ce5e0d8a48296b51c9c2eff4867e2a9a70194091
Stats:     421 lines in 62 files changed: 206 ins; 97 del; 118 mod

8373945: Use WB.fullGC() in ClassUnloader.unloadClass to force GC for vmTestbase tests

Reviewed-by: cjplummer, lmesnik

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PR: https://git.openjdk.org/jdk/pull/28891