Tue, 19 May 2015 15:49:27 +0200
8061715: gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before
Summary: added WhiteBox methods to count regions and exact aux data sizes
Reviewed-by: jwilhelm, brutisso
1 /*
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/virtualspace.hpp"
31 #include "utilities/globalDefinitions.hpp"
33 class CardTableModRefBS;
34 class G1CardCounts;
35 class G1CollectedHeap;
36 class G1RegionToSpaceMapper;
37 class HeapRegion;
39 class G1CardCountsMappingChangedListener : public G1MappingChangedListener {
40 private:
41 G1CardCounts* _counts;
42 public:
43 void set_cardcounts(G1CardCounts* counts) { _counts = counts; }
45 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
46 };
48 // Table to track the number of times a card has been refined. Once
49 // a card has been refined a certain number of times, it is
50 // considered 'hot' and its refinement is delayed by inserting the
51 // card into the hot card cache. The card will then be refined when
52 // it is evicted from the hot card cache, or when the hot card cache
53 // is 'drained' during the next evacuation pause.
55 class G1CardCounts: public CHeapObj<mtGC> {
56 G1CardCountsMappingChangedListener _listener;
58 G1CollectedHeap* _g1h;
60 // The table of counts
61 jubyte* _card_counts;
63 // Max capacity of the reserved space for the counts table
64 size_t _reserved_max_card_num;
66 // CardTable bottom.
67 const jbyte* _ct_bot;
69 // Barrier set
70 CardTableModRefBS* _ct_bs;
72 // Returns true if the card counts table has been reserved.
73 bool has_reserved_count_table() { return _card_counts != NULL; }
75 // Returns true if the card counts table has been reserved and committed.
76 bool has_count_table() {
77 return has_reserved_count_table();
78 }
80 size_t ptr_2_card_num(const jbyte* card_ptr) {
81 assert(card_ptr >= _ct_bot,
82 err_msg("Invalid card pointer: "
83 "card_ptr: " PTR_FORMAT ", "
84 "_ct_bot: " PTR_FORMAT,
85 p2i(card_ptr), p2i(_ct_bot)));
86 size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
87 assert(card_num >= 0 && card_num < _reserved_max_card_num,
88 err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
89 return card_num;
90 }
92 jbyte* card_num_2_ptr(size_t card_num) {
93 assert(card_num >= 0 && card_num < _reserved_max_card_num,
94 err_msg("card num out of range: "SIZE_FORMAT, card_num));
95 return (jbyte*) (_ct_bot + card_num);
96 }
98 // Clear the counts table for the given (exclusive) index range.
99 void clear_range(size_t from_card_num, size_t to_card_num);
101 public:
102 G1CardCounts(G1CollectedHeap* g1h);
104 void initialize(G1RegionToSpaceMapper* mapper);
106 // Increments the refinement count for the given card.
107 // Returns the pre-increment count value.
108 uint add_card_count(jbyte* card_ptr);
110 // Returns true if the given count is high enough to be considered
111 // 'hot'; false otherwise.
112 bool is_hot(uint count);
114 // Clears the card counts for the cards spanned by the region
115 void clear_region(HeapRegion* hr);
117 // Clears the card counts for the cards spanned by the MemRegion
118 void clear_range(MemRegion mr);
120 // Clear the entire card counts table during GC.
121 void clear_all();
122 };
124 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP