RFR: 8266073: Regression ~2% in Derby after 8261804

[Albert Mingkun Yang]

On Tue, 11 May 2021 11:35:51 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> My change in 8261804 made processing_is_mt() to always be false when _active_mt_degree is one. This is better because we then need not to execute on another thread. However, at a few places we do not change the _active_mt_degree if processing_is_mt() is false. We could then be stuck at 1 thread. I now change the code to always change the mt degree. 
> 
> Derby does no longer regress for g1, and tier 1 passes. I am running tier 1-3 at the moment.

Marked as reviewed by ayang (Committer).

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PR: https://git.openjdk.java.net/jdk/pull/3972