1 /*
2 * Copyright (c) 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.
8 *
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
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_CARDGENERATION_HPP
26 #define SHARE_VM_MEMORY_CARDGENERATION_HPP
27
28 // Class CardGeneration is a generation that is covered by a card table,
29 // and uses a card-size block-offset array to implement block_start.
30
31 #include "memory/generation.hpp"
32
33 class BlockOffsetSharedArray;
34 class CompactibleSpace;
35
36 class CardGeneration: public Generation {
37 friend class VMStructs;
38 protected:
39 // This is shared with other generations.
40 GenRemSet* _rs;
41 // This is local to this generation.
42 BlockOffsetSharedArray* _bts;
43
44 // Current shrinking effect: this damps shrinking when the heap gets empty.
45 size_t _shrink_factor;
46
47 size_t _min_heap_delta_bytes; // Minimum amount to expand.
48
49 // Some statistics from before gc started.
50 // These are gathered in the gc_prologue (and should_collect)
51 // to control growing/shrinking policy in spite of promotions.
79
80 // Grow generation with specified size (returns false if unable to grow)
81 bool grow_by(size_t bytes);
82 // Grow generation to reserved size.
83 bool grow_to_reserved();
84
85 size_t capacity() const;
86 size_t used() const;
87 size_t free() const;
88 MemRegion used_region() const;
89
90 void space_iterate(SpaceClosure* blk, bool usedOnly = false);
91
92 void younger_refs_iterate(OopsInGenClosure* blk);
93
94 bool is_in(const void* p) const;
95
96 CompactibleSpace* first_compaction_space() const;
97 };
98
99 #endif // SHARE_VM_MEMORY_CARDGENERATION_HPP
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1 /*
2 * Copyright (c) 2014, 2015, 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.
8 *
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
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_SHARED_CARDGENERATION_HPP
26 #define SHARE_VM_GC_SHARED_CARDGENERATION_HPP
27
28 // Class CardGeneration is a generation that is covered by a card table,
29 // and uses a card-size block-offset array to implement block_start.
30
31 #include "gc/shared/generation.hpp"
32
33 class BlockOffsetSharedArray;
34 class CompactibleSpace;
35
36 class CardGeneration: public Generation {
37 friend class VMStructs;
38 protected:
39 // This is shared with other generations.
40 GenRemSet* _rs;
41 // This is local to this generation.
42 BlockOffsetSharedArray* _bts;
43
44 // Current shrinking effect: this damps shrinking when the heap gets empty.
45 size_t _shrink_factor;
46
47 size_t _min_heap_delta_bytes; // Minimum amount to expand.
48
49 // Some statistics from before gc started.
50 // These are gathered in the gc_prologue (and should_collect)
51 // to control growing/shrinking policy in spite of promotions.
79
80 // Grow generation with specified size (returns false if unable to grow)
81 bool grow_by(size_t bytes);
82 // Grow generation to reserved size.
83 bool grow_to_reserved();
84
85 size_t capacity() const;
86 size_t used() const;
87 size_t free() const;
88 MemRegion used_region() const;
89
90 void space_iterate(SpaceClosure* blk, bool usedOnly = false);
91
92 void younger_refs_iterate(OopsInGenClosure* blk);
93
94 bool is_in(const void* p) const;
95
96 CompactibleSpace* first_compaction_space() const;
97 };
98
99 #endif // SHARE_VM_GC_SHARED_CARDGENERATION_HPP
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