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8373403: [TESTBUG] TestG1ClassUnloadingHWM.java could fail with large G1HeapRegionSize and small InitialHeapSize #28738

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caoman wants to merge 3 commits into from
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8373403: [TESTBUG] TestG1ClassUnloadingHWM.java could fail with large G1HeapRegionSize and small InitialHeapSize #28738

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8373403: [TESTBUG] TestG1ClassUnloadingHWM.java could fail with large…
caoman Dec 10, 2025
6c6fbfe
Switch to check for 'Metadata GC Threshold' for full GCs
caoman Dec 10, 2025
70e88ef
Also check for 'Metadata GC Threshold' for young GC
caoman Dec 11, 2025
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16 changes: 9 additions & 7 deletions test/hotspot/jtreg/gc/class_unloading/TestG1ClassUnloadingHWM.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -68,19 +68,21 @@ public static OutputAnalyzer runWithoutG1ClassUnloading() throws Exception {
}

public static void testWithoutG1ClassUnloading() throws Exception {
// -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC instead of a concurrent cycle.
// -XX:-ClassUnloadingWithConcurrentMark is used, so we expect a full GC due to Metadata GC Threshold
// instead of a concurrent cycle.
OutputAnalyzer out = runWithoutG1ClassUnloading();

out.shouldMatch(".*Pause Full.*");
out.shouldNotMatch(".*Pause Young \\(Concurrent Start\\).*");
out.shouldMatch(".*Pause Full \\(Metadata GC Threshold\\).*");
out.shouldNotMatch(".*Pause Young \\(Concurrent Start\\) \\(Metadata GC Threshold\\).*");
}

public static void testWithG1ClassUnloading() throws Exception {
// -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle instead of a full GC.
// -XX:+ClassUnloadingWithConcurrentMark is used, so we expect a concurrent cycle due to Metadata GC Threshold
// instead of a full GC.
OutputAnalyzer out = runWithG1ClassUnloading();

out.shouldMatch(".*Pause Young \\(Concurrent Start\\).*");
out.shouldNotMatch(".*Pause Full.*");
out.shouldMatch(".*Pause Young \\(Concurrent Start\\) \\(Metadata GC Threshold\\).*");
out.shouldNotMatch(".*Pause Full \\(Metadata GC Threshold\\).*");
}

public static void main(String args[]) throws Exception {
Expand Down