RFR: 8376051: gc/stress/TestStressG1Uncommit.java fails assertLessThan: expected that xxx < xxx [v2]

[Thomas Schatzl]

On Thu, 22 Jan 2026 12:03:45 GMT, SendaoYan <syan at openjdk.org> wrote:

>> Hi all,
>> 
>> [JDK-8238686](https://bugs.openjdk.org/browse/JDK-8238686) change the default value MinHeapFreeRatio/MaxHeapFreeRatio to 0/100, this change make G1 do less uncommit heap memory to OS system, this will make test test/hotspot/jtreg/gc/stress/TestStressG1Uncommit.java fails "assertLessThan: expected that xxx < xxx", and the tested java process never print "Uncommit regions" which checked by this test.
>> 
>> This PR set MinHeapFreeRatio/MaxHeapFreeRatio to the original value 40/70 to make this test work expectly.
>> 
>> Change has been verified locally on linux-x64 by run this tests both with release build and fastdebug build.
>
> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert the use of WhiteBox.fullGC()

Marked as reviewed by tschatzl (Reviewer).

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

PR Review: https://git.openjdk.org/jdk/pull/29357#pullrequestreview-3692559799