Wed, 27 Aug 2014 09:36:55 +0200
Merge
1 /*
2 * Copyright (c) 2007, 2013, 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.
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23 */
25 #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
28 #include "utilities/macros.hpp"
29 #if INCLUDE_ALL_GCS
30 #include "gc_implementation/g1/g1MonitoringSupport.hpp"
31 #include "services/memoryPool.hpp"
32 #include "services/memoryUsage.hpp"
33 #endif // INCLUDE_ALL_GCS
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 //
53 // This class is shared by the three G1 memory pool classes
54 // (G1EdenPool, G1SurvivorPool, G1OldGenPool).
55 class G1MemoryPoolSuper : public CollectedMemoryPool {
56 protected:
57 const static size_t _undefined_max = (size_t) -1;
58 G1MonitoringSupport* _g1mm;
60 // Would only be called from subclasses.
61 G1MemoryPoolSuper(G1CollectedHeap* g1h,
62 const char* name,
63 size_t init_size,
64 size_t max_size,
65 bool support_usage_threshold);
66 };
68 // Memory pool that represents the G1 eden.
69 class G1EdenPool : public G1MemoryPoolSuper {
70 public:
71 G1EdenPool(G1CollectedHeap* g1h);
73 size_t used_in_bytes() {
74 return _g1mm->eden_space_used();
75 }
76 size_t max_size() const {
77 return _undefined_max;
78 }
79 MemoryUsage get_memory_usage();
80 };
82 // Memory pool that represents the G1 survivor.
83 class G1SurvivorPool : public G1MemoryPoolSuper {
84 public:
85 G1SurvivorPool(G1CollectedHeap* g1h);
87 size_t used_in_bytes() {
88 return _g1mm->survivor_space_used();
89 }
90 size_t max_size() const {
91 return _undefined_max;
92 }
93 MemoryUsage get_memory_usage();
94 };
96 // Memory pool that represents the G1 old gen.
97 class G1OldGenPool : public G1MemoryPoolSuper {
98 public:
99 G1OldGenPool(G1CollectedHeap* g1h);
101 size_t used_in_bytes() {
102 return _g1mm->old_space_used();
103 }
104 size_t max_size() const {
105 return _g1mm->old_gen_max();
106 }
107 MemoryUsage get_memory_usage();
108 };
110 #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP