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8329223: Parallel: Parallel GC resizes heap even if -Xms = -Xmx

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Reviewed-by: ayang, gli
This commit is contained in:
Zhengyu Gu 2024-04-30 16:20:10 +00:00
parent 3d11692bf3
commit aca1e8365b
1 changed files with 8 additions and 5 deletions
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13
src/hotspot/share/gc/shared/genArguments.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2024, 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
@ -276,6 +276,9 @@ void GenArguments::initialize_size_info() {
// and maximum heap size since no explicit flags exist
// for setting the old generation maximum.
MaxOldSize = MAX2(MaxHeapSize - max_young_size, GenAlignment);
MinOldSize = MIN3(MaxOldSize,
InitialHeapSize - initial_young_size,
MinHeapSize - MinNewSize);
size_t initial_old_size = OldSize;
@ -287,9 +290,8 @@ void GenArguments::initialize_size_info() {
// with the overall heap size). In either case make
// the minimum, maximum and initial sizes consistent
// with the young sizes and the overall heap sizes.
MinOldSize = GenAlignment;
initial_old_size = clamp(InitialHeapSize - initial_young_size, MinOldSize, MaxOldSize);
// MaxOldSize has already been made consistent above.
// MaxOldSize and MinOldSize have already been made consistent above.
} else {
// OldSize has been explicitly set on the command line. Use it
// for the initial size but make sure the minimum allow a young
@ -304,9 +306,10 @@ void GenArguments::initialize_size_info() {
", -XX:OldSize flag is being ignored",
MaxHeapSize);
initial_old_size = MaxOldSize;
} else if (initial_old_size < MinOldSize) {
log_warning(gc, ergo)("Inconsistency between initial old size and minimum old size");
MinOldSize = initial_old_size;
}
MinOldSize = MIN2(initial_old_size, MinHeapSize - MinNewSize);
}
// The initial generation sizes should match the initial heap size,