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  1. JDK
  2. JDK-8303252

G1: Return early from Full-GC if no regions are selected for compaction.

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      For some cases, during the `phase2_prepare_compaction` no regions are selected for compaction due to a high live ratio in all regions.

      In these cases, we should skip the remaining adjust and compaction phases of the Full-GC and return early.

            iwalulya Ivan Walulya
            iwalulya Ivan Walulya
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