8382935: TestHeapSummaryEventG1.java does not support concurrent cycles

[sendaoYan]

Hi all,

HeapSummaryEventAllGcs assumed that each After GC event immediately follows its matching Before GC in JFR event order. G1 can emit Before GC for a concurrent-mark gcId before several intervening pauses complete; the matching After GC for that gcId is emitted at concurrent cycle end, so event order is not strictly nested by arrival order.

Track pending gcIds from Before GC events per event type and match After GC events by removing the corresponding gcId, instead of comparing to the last seen event. Assert no unmatched Before events remain. Align the heap vs metaspace sanity check using the last Before gcId from each stream.

Additional testing:

• All tests invoke test/jdk/jdk/jfr/event/gc/heapsummary/HeapSummaryEventAllGcs.java

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Issue

• JDK-8382935: TestHeapSummaryEventG1.java does not support concurrent cycles (Bug - P4)

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[sendaoYan]

Verified command:
jtreg -conc:5 test/jdk/jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventG1.java test/jdk/jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventPSParOld.java test/jdk/jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventDefNewSerial.java

[mlbridge]

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• 00: Full (82e2a872)