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8270169: G1: Incorrect reference discovery MT degree in concurrent marking #4741

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@@ -1845,8 +1845,8 @@ void G1CollectedHeap::ref_processing_init() {
_ref_processor_cm =
new ReferenceProcessor(&_is_subject_to_discovery_cm,
ParallelGCThreads, // degree of mt processing
(ParallelGCThreads > 1) || (ConcGCThreads > 1), // mt discovery
MAX2(ParallelGCThreads, ConcGCThreads), // degree of mt discovery
(ConcGCThreads > 1), // mt discovery
ConcGCThreads, // degree of mt discovery
false, // Reference discovery is not atomic
&_is_alive_closure_cm); // is alive closure