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G1 presently uses the GCLocker mechanism to support JNI critical array and string operations. It could instead use object pinning via region pinning.

duplicates

JDK-8269419 G1: Support pinned Ojbect and remove/simplify GCLocker usage in G1

JDK-8318706 Implement JEP 423: Region Pinning for G1

relates to

JDK-8254738 G1: Improve generation placement heuristics for regions that could not be evacuated

JDK-8254167 G1: Record regions where evacuation failed to provide targeted iteration

JDK-8254739 G1: Optimize evacuation failure for regions with few failed objects

JDK-8192647 GClocker induced GCs can starve threads requiring memory leading to OOME

JDK-8253600 G1: Fully support pinned regions for full gc

(2 relates to)