RFR: 8270169: G1: Incorrect reference discovery MT degree in concurrent marking

[Albert Mingkun Yang]

On Fri, 9 Jul 2021 13:11:30 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of ref discovery MT degree in concurrent marking.
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/4741