1 /*
2 * Copyright (c) 2001, 2009, 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 // Keeps track of the GC work and decides when it is OK to do GC work
26 // and for how long so that the MMU invariants are maintained.
27
28 /***** ALL TIMES ARE IN SECS!!!!!!! *****/
29
30 // this is the "interface"
31 class G1MMUTracker: public CHeapObj {
32 protected:
33 double _time_slice;
34 double _max_gc_time; // this is per time slice
35
36 public:
37 G1MMUTracker(double time_slice, double max_gc_time);
38
39 virtual void add_pause(double start, double end, bool gc_thread) = 0;
40 virtual double longest_pause(double current_time) = 0;
41 virtual double when_sec(double current_time, double pause_time) = 0;
42
43 double max_gc_time() {
44 return _max_gc_time;
110 int _no_entries;
111
112 inline int trim_index(int index) {
113 return (index + QueueLength) % QueueLength;
114 }
115
116 void remove_expired_entries(double current_time);
117 double calculate_gc_time(double current_time);
118
119 double longest_pause_internal(double current_time);
120 double when_internal(double current_time, double pause_time);
121
122 public:
123 G1MMUTrackerQueue(double time_slice, double max_gc_time);
124
125 virtual void add_pause(double start, double end, bool gc_thread);
126
127 virtual double longest_pause(double current_time);
128 virtual double when_sec(double current_time, double pause_time);
129 };
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1 /*
2 * Copyright (c) 2001, 2010, 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_IMPLEMENTATION_G1_G1MMUTRACKER_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1MMUTRACKER_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/debug.hpp"
30
31 // Keeps track of the GC work and decides when it is OK to do GC work
32 // and for how long so that the MMU invariants are maintained.
33
34 /***** ALL TIMES ARE IN SECS!!!!!!! *****/
35
36 // this is the "interface"
37 class G1MMUTracker: public CHeapObj {
38 protected:
39 double _time_slice;
40 double _max_gc_time; // this is per time slice
41
42 public:
43 G1MMUTracker(double time_slice, double max_gc_time);
44
45 virtual void add_pause(double start, double end, bool gc_thread) = 0;
46 virtual double longest_pause(double current_time) = 0;
47 virtual double when_sec(double current_time, double pause_time) = 0;
48
49 double max_gc_time() {
50 return _max_gc_time;
116 int _no_entries;
117
118 inline int trim_index(int index) {
119 return (index + QueueLength) % QueueLength;
120 }
121
122 void remove_expired_entries(double current_time);
123 double calculate_gc_time(double current_time);
124
125 double longest_pause_internal(double current_time);
126 double when_internal(double current_time, double pause_time);
127
128 public:
129 G1MMUTrackerQueue(double time_slice, double max_gc_time);
130
131 virtual void add_pause(double start, double end, bool gc_thread);
132
133 virtual double longest_pause(double current_time);
134 virtual double when_sec(double current_time, double pause_time);
135 };
136
137 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MMUTRACKER_HPP
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