1 /*
2 * Copyright (c) 2007, 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_SERVICES_G1MEMORYPOOL_HPP
26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
27
28 #include "utilities/macros.hpp"
29 #if INCLUDE_ALL_GCS
30 #include "gc/g1/g1MonitoringSupport.hpp"
31 #include "services/memoryPool.hpp"
32 #include "services/memoryUsage.hpp"
33 #endif // INCLUDE_ALL_GCS
34
35 // This file contains the three classes that represent the memory
36 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and
37 // G1OldGenPool. In G1, unlike our other GCs, we do not have a
38 // physical space for each of those spaces. Instead, we allocate
39 // regions for all three spaces out of a single pool of regions (that
40 // pool basically covers the entire heap). As a result, the eden,
41 // survivor, and old gen are considered logical spaces in G1, as each
42 // is a set of non-contiguous regions. This is also reflected in the
43 // way we map them to memory pools here. The easiest way to have done
44 // this would have been to map the entire G1 heap to a single memory
45 // pool. However, it's helpful to show how large the eden and survivor
46 // get, as this does affect the performance and behavior of G1. Which
47 // is why we introduce the three memory pools implemented here.
48 //
49 // See comments in g1MonitoringSupport.hpp for additional details
50 // on this model.
51 //
52
53 // This class is shared by the three G1 memory pool classes
|
1 /*
2 * Copyright (c) 2007, 2017, 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_SERVICES_G1MEMORYPOOL_HPP
26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
27
28 #include "utilities/macros.hpp"
29 #include "gc/g1/g1MonitoringSupport.hpp"
30 #include "services/memoryPool.hpp"
31 #include "services/memoryUsage.hpp"
32
33 // This file contains the three classes that represent the memory
34 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and
35 // G1OldGenPool. In G1, unlike our other GCs, we do not have a
36 // physical space for each of those spaces. Instead, we allocate
37 // regions for all three spaces out of a single pool of regions (that
38 // pool basically covers the entire heap). As a result, the eden,
39 // survivor, and old gen are considered logical spaces in G1, as each
40 // is a set of non-contiguous regions. This is also reflected in the
41 // way we map them to memory pools here. The easiest way to have done
42 // this would have been to map the entire G1 heap to a single memory
43 // pool. However, it's helpful to show how large the eden and survivor
44 // get, as this does affect the performance and behavior of G1. Which
45 // is why we introduce the three memory pools implemented here.
46 //
47 // See comments in g1MonitoringSupport.hpp for additional details
48 // on this model.
49 //
50
51 // This class is shared by the three G1 memory pool classes
|