RFR: 8361897: gc/z/TestUncommit.java fails with Uncommitted too slow

[Stefan Karlsson]

On Tue, 29 Jul 2025 14:58:09 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> This proposed change loosens the the threshold for flagging slow un-committing as an error in TestUncommit.java. Rather than requiring the un-committing be completed within 3 ZUncommitDelay, allow up to 5 ZUncommitDelay to accommodate the test being executed in environments where external factors affect whether un-committing is run as expected. 
> 
> In the observed intermittent failures, what can be seen is that the un-committer thread wakes up a significant time after the expected timeout has expired. And because we expect multiple timeouts, the accumulated extra time waiting can push the actual delay just past 3 ZUncommitDelay. Using a factor of 5 instead should remove all but the most extreme intermittent occurrences and still capture if the un-commit logic breaks completely.

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26536#pullrequestreview-3068586544