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_GC_SHARED_AGETABLE_HPP
26 #define SHARE_GC_SHARED_AGETABLE_HPP
27
28 #include "oops/markWord.hpp"
29 #include "oops/oop.hpp"
30 #include "runtime/perfDataTypes.hpp"
31
32 /* Copyright (c) 1992, 2021, Oracle and/or its affiliates, and Stanford University.
33 See the LICENSE file for license information. */
34
35 // Age table for adaptive feedback-mediated tenuring (scavenging)
36 //
37 // Note: all sizes are in oops
38
39 class AgeTable {
40 friend class VMStructs;
41
42 public:
43 // constants
44 enum { table_size = markWord::max_age + 1 };
45
46 // instance variables
47 size_t sizes[table_size];
48
49 // constructor. "global" indicates that this is the global age table
50 // (as opposed to gc-thread-local)
51 AgeTable(bool global = true);
52
53 // clear table
54 void clear();
55
56 // add entry
57 inline void add(oop p, size_t oop_size);
58
59 void add(uint age, size_t oop_size) {
60 assert(age > 0 && age < table_size, "invalid age of object");
61 sizes[age] += oop_size;
62 }
63
64 // Merge another age table with the current one. Used
65 // for parallel young generation gc.
66 void merge(const AgeTable* subTable);
67
68 // Calculate new tenuring threshold based on age information.
69 uint compute_tenuring_threshold(size_t desired_survivor_size);
70 void print_age_table(uint tenuring_threshold);
71 void print_on(outputStream* st, uint tenuring_threshold);
72
73 private:
74 bool _use_perf_data;
75 PerfVariable* _perf_sizes[table_size];
76 };
77
78 #endif // SHARE_GC_SHARED_AGETABLE_HPP
|
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_GC_SHARED_AGETABLE_HPP
26 #define SHARE_GC_SHARED_AGETABLE_HPP
27
28 #include "memory/allocation.hpp"
29 #include "oops/markWord.hpp"
30 #include "oops/oop.hpp"
31 #include "runtime/perfDataTypes.hpp"
32
33 /* Copyright (c) 1992, 2021, Oracle and/or its affiliates, and Stanford University.
34 See the LICENSE file for license information. */
35
36 // Age table for adaptive feedback-mediated tenuring (scavenging)
37 //
38 // Note: all sizes are in oops
39
40 class AgeTable: public CHeapObj<mtGC> {
41 friend class VMStructs;
42
43 public:
44 // constants
45 enum { table_size = markWord::max_age + 1 };
46
47 // instance variables
48 size_t sizes[table_size];
49
50 // constructor. "global" indicates that this is the global age table
51 // (as opposed to gc-thread-local)
52 AgeTable(bool global = true);
53
54 // clear table
55 void clear();
56
57 #ifndef PRODUCT
58 // check whether it's clear
59 bool is_clear() const;
60 #endif // !PRODUCT
61
62 // add entry
63 inline void add(oop p, size_t oop_size);
64
65 void add(uint age, size_t oop_size) {
66 assert(age < table_size, "invalid age of object");
67 sizes[age] += oop_size;
68 }
69
70 // Merge another age table with the current one.
71 void merge(const AgeTable* subTable);
72
73 // Calculate new tenuring threshold based on age information.
74 uint compute_tenuring_threshold(size_t desired_survivor_size);
75 void print_age_table(uint tenuring_threshold);
76 void print_on(outputStream* st, uint tenuring_threshold);
77
78 private:
79 bool _use_perf_data;
80 PerfVariable* _perf_sizes[table_size];
81 };
82
83 #endif // SHARE_GC_SHARED_AGETABLE_HPP
|