1/*
2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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24
25#ifndef SHARE_GC_G1_G1REMSETTRACKINGPOLICY_HPP
26#define SHARE_GC_G1_G1REMSETTRACKINGPOLICY_HPP
27
28#include "gc/g1/heapRegion.hpp"
29#include "gc/g1/heapRegionType.hpp"
30#include "memory/allocation.hpp"
31
32// The remembered set tracking policy determines for a given region the state of
33// the remembered set, ie. when it should be tracked, and if/when the remembered
34// set is complete.
35class G1RemSetTrackingPolicy : public CHeapObj<mtGC> {
36public:
37 // Do we need to scan the given region to get all outgoing references for remembered
38 // set rebuild?
39 bool needs_scan_for_rebuild(HeapRegion* r) const;
40 // Update remembered set tracking state at allocation of the region. May be
41 // called at any time. The caller makes sure that the changes to the remembered
42 // set state are visible to other threads.
43 void update_at_allocate(HeapRegion* r);
44 // Update remembered set tracking state for humongous regions before we are going to
45 // rebuild remembered sets. Called at safepoint in the remark pause.
46 bool update_humongous_before_rebuild(HeapRegion* r, bool is_live);
47 // Update remembered set tracking state before we are going to rebuild remembered
48 // sets. Called at safepoint in the remark pause.
49 bool update_before_rebuild(HeapRegion* r, size_t live_bytes);
50 // Update remembered set tracking state after rebuild is complete, i.e. the cleanup
51 // pause. Called at safepoint.
52 void update_after_rebuild(HeapRegion* r);
53 // Update remembered set tracking state when the region is freed.
54 void update_at_free(HeapRegion* r);
55};
56
57#endif // SHARE_GC_G1_G1REMSETTRACKINGPOLICY_HPP
58