1 /*
2 * Copyright (c) 2015, 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 #include "precompiled.hpp"
25 #include "gc/z/zPhysicalMemory.inline.hpp"
26 #include "logging/log.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "services/memTracker.hpp"
29 #include "utilities/debug.hpp"
30
31 ZPhysicalMemory::ZPhysicalMemory() :
32 _nsegments(0),
33 _segments(NULL) {}
34
35 ZPhysicalMemory::ZPhysicalMemory(size_t size) :
36 _nsegments(0),
37 _segments(NULL) {
38 add_segment(ZPhysicalMemorySegment(0, size));
39 }
40
41 ZPhysicalMemory::ZPhysicalMemory(const ZPhysicalMemorySegment& segment) :
42 _nsegments(0),
43 _segments(NULL) {
44 add_segment(segment);
45 }
46
47 size_t ZPhysicalMemory::size() const {
48 size_t size = 0;
49
50 for (size_t i = 0; i < _nsegments; i++) {
51 size += _segments[i].size();
52 }
53
54 return size;
55 }
56
57 void ZPhysicalMemory::add_segment(ZPhysicalMemorySegment segment) {
58 // Try merge with last segment
59 if (_nsegments > 0) {
60 ZPhysicalMemorySegment& last = _segments[_nsegments - 1];
61 assert(last.end() <= segment.start(), "Segments added out of order");
62 if (last.end() == segment.start()) {
63 // Merge
64 last.expand(segment.size());
65 return;
66 }
67 }
68
69 // Make room for a new segment
70 const size_t size = sizeof(ZPhysicalMemorySegment) * (_nsegments + 1);
71 _segments = (ZPhysicalMemorySegment*)ReallocateHeap((char*)_segments, size, mtGC);
72
73 // Add new segment
74 _segments[_nsegments] = segment;
75 _nsegments++;
76 }
77
78 ZPhysicalMemory ZPhysicalMemory::split(size_t split_size) {
79 // Only splitting of single-segment instances have been implemented.
80 assert(nsegments() == 1, "Can only have one segment");
81 assert(split_size <= size(), "Invalid size");
82 return ZPhysicalMemory(_segments[0].split(split_size));
83 }
84
85 void ZPhysicalMemory::clear() {
86 if (_segments != NULL) {
87 FreeHeap(_segments);
88 _segments = NULL;
89 _nsegments = 0;
90 }
91 }
92
93 ZPhysicalMemoryManager::ZPhysicalMemoryManager(size_t max_capacity, size_t granule_size) :
94 _backing(max_capacity, granule_size),
95 _max_capacity(max_capacity),
96 _capacity(0),
97 _used(0) {}
98
99 bool ZPhysicalMemoryManager::is_initialized() const {
100 return _backing.is_initialized();
101 }
102
103 bool ZPhysicalMemoryManager::ensure_available(size_t size) {
104 const size_t unused_capacity = _capacity - _used;
105 if (unused_capacity >= size) {
106 // Enough unused capacity available
107 return true;
108 }
109
110 const size_t expand_with = size - unused_capacity;
111 const size_t new_capacity = _capacity + expand_with;
112 if (new_capacity > _max_capacity) {
113 // Can not expand beyond max capacity
114 return false;
115 }
116
117 // Expand
118 if (!_backing.expand(_capacity, new_capacity)) {
119 log_error(gc)("Failed to expand Java heap with " SIZE_FORMAT "%s",
120 byte_size_in_proper_unit(expand_with),
121 proper_unit_for_byte_size(expand_with));
122 return false;
123 }
124
125 _capacity = new_capacity;
126
127 return true;
128 }
129
130 void ZPhysicalMemoryManager::nmt_commit(ZPhysicalMemory pmem, uintptr_t offset) {
131 const uintptr_t addr = _backing.nmt_address(offset);
132 const size_t size = pmem.size();
133 MemTracker::record_virtual_memory_commit((void*)addr, size, CALLER_PC);
134 }
135
136 void ZPhysicalMemoryManager::nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset) {
137 if (MemTracker::tracking_level() > NMT_minimal) {
138 const uintptr_t addr = _backing.nmt_address(offset);
139 const size_t size = pmem.size();
140
141 Tracker tracker(Tracker::uncommit);
142 tracker.record((address)addr, size);
143 }
144 }
145
146 ZPhysicalMemory ZPhysicalMemoryManager::alloc(size_t size) {
147 if (!ensure_available(size)) {
148 // Not enough memory available
149 return ZPhysicalMemory();
150 }
151
152 _used += size;
153 return _backing.alloc(size);
154 }
155
156 void ZPhysicalMemoryManager::free(ZPhysicalMemory pmem) {
157 _backing.free(pmem);
158 _used -= pmem.size();
159 }
160
161 void ZPhysicalMemoryManager::map(ZPhysicalMemory pmem, uintptr_t offset) {
162 // Map page
163 _backing.map(pmem, offset);
164
165 // Update native memory tracker
166 nmt_commit(pmem, offset);
167 }
168
169 void ZPhysicalMemoryManager::unmap(ZPhysicalMemory pmem, uintptr_t offset) {
170 // Update native memory tracker
171 nmt_uncommit(pmem, offset);
172
173 // Unmap page
174 _backing.unmap(pmem, offset);
175 }
176
177 void ZPhysicalMemoryManager::flip(ZPhysicalMemory pmem, uintptr_t offset) {
178 _backing.flip(pmem, offset);
179 }