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Hi all,

  please review this change to use `Atomic<T>` in `ParallelScavengeHeap`.

Testing: gha

Thanks,
  Thomas
This commit is contained in:
Thomas Schatzl 2026-01-26 16:27:08 +01:00
parent 37cb22826a
commit 52ec4355b1
1 changed files with 4 additions and 3 deletions
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7
src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2026, 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
@ -48,6 +48,7 @@
#include "memory/reservedSpace.hpp"
#include "memory/universe.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/atomic.hpp"
#include "runtime/cpuTimeCounters.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/handles.inline.hpp"
@ -594,7 +595,7 @@ void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) {
// these spaces.
// The old space is divided into fixed-size blocks.
class HeapBlockClaimer : public StackObj {
size_t _claimed_index;
Atomic<size_t> _claimed_index;
public:
static const size_t InvalidIndex = SIZE_MAX;
@ -606,7 +607,7 @@ public:
// Claim the block and get the block index.
size_t claim_and_get_block() {
size_t block_index;
block_index = AtomicAccess::fetch_then_add(&_claimed_index, 1u);
block_index = _claimed_index.fetch_then_add(1u);
PSOldGen* old_gen = ParallelScavengeHeap::heap()->old_gen();
size_t num_claims = old_gen->num_iterable_blocks() + NumNonOldGenClaims;