1 /*
2 * Copyright (c) 1997, 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_AGETABLE_HPP
26 #define SHARE_VM_GC_SHARED_AGETABLE_HPP
27
28 #include "oops/markOop.hpp"
29 #include "oops/oop.hpp"
30 #include "runtime/perfData.hpp"
31
32 class GCPolicyCounters;
33
34 /* Copyright (c) 1992, 2015, Oracle and/or its affiliates, and Stanford University.
35 See the LICENSE file for license information. */
36
37 // Age table for adaptive feedback-mediated tenuring (scavenging)
38 //
39 // Note: all sizes are in oops
40
41 class AgeTable VALUE_OBJ_CLASS_SPEC {
42 friend class VMStructs;
43
44 public:
45 // constants
46 enum { table_size = markOopDesc::max_age + 1 };
47
48 // instance variables
49 size_t sizes[table_size];
50
51 // constructor. "global" indicates that this is the global age table
52 // (as opposed to gc-thread-local)
53 AgeTable(bool global = true);
54
55 // clear table
56 void clear();
57
58 // add entry
59 void add(oop p, size_t oop_size) {
60 add(p->age(), oop_size);
61 }
62
63 void add(uint age, size_t oop_size) {
64 assert(age > 0 && age < table_size, "invalid age of object");
65 sizes[age] += oop_size;
66 }
67
68 // Merge another age table with the current one. Used
69 // for parallel young generation gc.
70 void merge(AgeTable* subTable);
71
72 // calculate new tenuring threshold based on age information
73 uint compute_tenuring_threshold(size_t survivor_capacity, GCPolicyCounters* gc_counters);
74
75 private:
76 PerfVariable* _perf_sizes[table_size];
77 };
78
79 #endif // SHARE_VM_GC_SHARED_AGETABLE_HPP
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1 /*
2 * Copyright (c) 1997, 2016, 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_AGETABLE_HPP
26 #define SHARE_VM_GC_SHARED_AGETABLE_HPP
27
28 #include "oops/markOop.hpp"
29 #include "oops/oop.hpp"
30 #include "runtime/perfData.hpp"
31
32 class GCPolicyCounters;
33
34 /* Copyright (c) 1992, 2016, Oracle and/or its affiliates, and Stanford University.
35 See the LICENSE file for license information. */
36
37 // Age table for adaptive feedback-mediated tenuring (scavenging)
38 //
39 // Note: all sizes are in oops
40
41 class AgeTable VALUE_OBJ_CLASS_SPEC {
42 friend class VMStructs;
43
44 public:
45 // constants
46 enum { table_size = markOopDesc::max_age + 1 };
47
48 // instance variables
49 size_t sizes[table_size];
50
51 // constructor. "global" indicates that this is the global age table
52 // (as opposed to gc-thread-local)
53 AgeTable(bool global = true);
54
55 // clear table
56 void clear();
57
58 // add entry
59 inline void add(oop p, size_t oop_size);
60
61 void add(uint age, size_t oop_size) {
62 assert(age > 0 && age < table_size, "invalid age of object");
63 sizes[age] += oop_size;
64 }
65
66 // Merge another age table with the current one. Used
67 // for parallel young generation gc.
68 void merge(AgeTable* subTable);
69
70 // calculate new tenuring threshold based on age information
71 uint compute_tenuring_threshold(size_t survivor_capacity, GCPolicyCounters* gc_counters);
72
73 private:
74 PerfVariable* _perf_sizes[table_size];
75 };
76
77 #endif // SHARE_VM_GC_SHARED_AGETABLE_HPP
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