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8238686: G1 may waste lots of space or fail to uncommit when observing MinHeapFreeRatio during sizing after full gc

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Reviewed-by: tschatzl, sjohanss
This commit is contained in:
Ivan Walulya 2026-01-21 09:51:01 +00:00
parent 4f87fb53ee
commit b1340305c8
1 changed files with 12 additions and 1 deletions
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13
src/hotspot/share/gc/g1/g1Arguments.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -209,6 +209,17 @@ void G1Arguments::initialize() {
FLAG_SET_DEFAULT(GCTimeRatio, 24);
}
// Do not interfere with GC-Pressure driven heap resizing unless the user
// explicitly sets otherwise. G1 heap sizing should be free to grow or shrink
// the heap based on GC pressure, rather than being forced to satisfy
// MinHeapFreeRatio or MaxHeapFreeRatio defaults that the user did not set.
if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
}
if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
}
// Below, we might need to calculate the pause time interval based on
// the pause target. When we do so we are going to give G1 maximum
// flexibility and allow it to do pauses when it needs to. So, we'll