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 *
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.
52 size_t _capacity_at_prologue;
53 size_t _used_at_prologue;
54
55 CardGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
56 GenRemSet* remset);
57
58 virtual void assert_correct_size_change_locking() = 0;
59
60 virtual CompactibleSpace* space() const = 0;
61
62 public:
63
64 // Attempt to expand the generation by "bytes". Expand by at a
65 // minimum "expand_bytes". Return true if some amount (not
66 // necessarily the full "bytes") was done.
67 virtual bool expand(size_t bytes, size_t expand_bytes);
68
69 // Shrink generation with specified size
70 virtual void shrink(size_t bytes);
71
72 virtual void compute_new_size();
73
74 virtual void clear_remembered_set();
75
76 virtual void invalidate_remembered_set();
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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 *
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.
52 size_t _capacity_at_prologue;
53 size_t _used_at_prologue;
54
55 CardGeneration(ReservedSpace rs, size_t initial_byte_size, GenRemSet* remset);
56
57 virtual void assert_correct_size_change_locking() = 0;
58
59 virtual CompactibleSpace* space() const = 0;
60
61 public:
62
63 // Attempt to expand the generation by "bytes". Expand by at a
64 // minimum "expand_bytes". Return true if some amount (not
65 // necessarily the full "bytes") was done.
66 virtual bool expand(size_t bytes, size_t expand_bytes);
67
68 // Shrink generation with specified size
69 virtual void shrink(size_t bytes);
70
71 virtual void compute_new_size();
72
73 virtual void clear_remembered_set();
74
75 virtual void invalidate_remembered_set();
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