20337
|
1 /*
|
|
2 * Copyright (c) 2014, 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 #include "precompiled.hpp"
|
|
26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
|
|
27 #include "oops/markOop.hpp"
|
|
28 #include "oops/oop.inline.hpp"
|
|
29 #include "services/memTracker.hpp"
|
|
30 #ifdef TARGET_OS_FAMILY_linux
|
|
31 # include "os_linux.inline.hpp"
|
|
32 #endif
|
|
33 #ifdef TARGET_OS_FAMILY_solaris
|
|
34 # include "os_solaris.inline.hpp"
|
|
35 #endif
|
|
36 #ifdef TARGET_OS_FAMILY_windows
|
|
37 # include "os_windows.inline.hpp"
|
|
38 #endif
|
|
39 #ifdef TARGET_OS_FAMILY_aix
|
|
40 # include "os_aix.inline.hpp"
|
|
41 #endif
|
|
42 #ifdef TARGET_OS_FAMILY_bsd
|
|
43 # include "os_bsd.inline.hpp"
|
|
44 #endif
|
|
45 #include "utilities/bitMap.inline.hpp"
|
|
46
|
|
47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
|
|
48 _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) {
|
|
49 }
|
|
50
|
|
51 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
|
|
52 if (!rs.is_reserved()) {
|
|
53 return false; // Allocation failed.
|
|
54 }
|
|
55 assert(_low_boundary == NULL, "VirtualSpace already initialized");
|
|
56 assert(page_size > 0, "Granularity must be non-zero.");
|
|
57
|
|
58 _low_boundary = rs.base();
|
|
59 _high_boundary = _low_boundary + rs.size();
|
|
60
|
|
61 _special = rs.special();
|
|
62 _executable = rs.executable();
|
|
63
|
|
64 _page_size = page_size;
|
|
65
|
|
66 assert(_committed.size() == 0, "virtual space initialized more than once");
|
|
67 uintx size_in_bits = rs.size() / page_size;
|
|
68 _committed.resize(size_in_bits, /* in_resource_area */ false);
|
|
69
|
|
70 return true;
|
|
71 }
|
|
72
|
|
73
|
|
74 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
|
|
75 release();
|
|
76 }
|
|
77
|
|
78 void G1PageBasedVirtualSpace::release() {
|
|
79 // This does not release memory it never reserved.
|
|
80 // Caller must release via rs.release();
|
|
81 _low_boundary = NULL;
|
|
82 _high_boundary = NULL;
|
|
83 _special = false;
|
|
84 _executable = false;
|
|
85 _page_size = 0;
|
|
86 _committed.resize(0, false);
|
|
87 }
|
|
88
|
|
89 size_t G1PageBasedVirtualSpace::committed_size() const {
|
|
90 return _committed.count_one_bits() * _page_size;
|
|
91 }
|
|
92
|
|
93 size_t G1PageBasedVirtualSpace::reserved_size() const {
|
|
94 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
|
|
95 }
|
|
96
|
|
97 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
|
|
98 return reserved_size() - committed_size();
|
|
99 }
|
|
100
|
|
101 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
|
|
102 return (addr - _low_boundary) / _page_size;
|
|
103 }
|
|
104
|
|
105 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
|
|
106 uintptr_t end = start + size_in_pages;
|
|
107 return _committed.get_next_zero_offset(start, end) >= end;
|
|
108 }
|
|
109
|
|
110 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
|
|
111 uintptr_t end = start + size_in_pages;
|
|
112 return _committed.get_next_one_offset(start, end) >= end;
|
|
113 }
|
|
114
|
|
115 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
|
|
116 return _low_boundary + index * _page_size;
|
|
117 }
|
|
118
|
|
119 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
|
|
120 return num * _page_size;
|
|
121 }
|
|
122
|
|
123 MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
|
|
124 // We need to make sure to commit all pages covered by the given area.
|
|
125 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
|
|
126
|
|
127 if (!_special) {
|
|
128 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
|
|
129 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
|
|
130 }
|
|
131 _committed.set_range(start, start + size_in_pages);
|
|
132
|
|
133 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
|
|
134 return result;
|
|
135 }
|
|
136
|
|
137 MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
|
|
138 guarantee(is_area_committed(start, size_in_pages), "checking");
|
|
139
|
|
140 if (!_special) {
|
|
141 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
|
|
142 }
|
|
143
|
|
144 _committed.clear_range(start, start + size_in_pages);
|
|
145
|
|
146 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
|
|
147 return result;
|
|
148 }
|
|
149
|
|
150 bool G1PageBasedVirtualSpace::contains(const void* p) const {
|
|
151 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
|
|
152 }
|
|
153
|
|
154 #ifndef PRODUCT
|
|
155 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
|
|
156 out->print ("Virtual space:");
|
|
157 if (special()) out->print(" (pinned in memory)");
|
|
158 out->cr();
|
|
159 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
|
|
160 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
|
|
161 out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
|
|
162 }
|
|
163
|
|
164 void G1PageBasedVirtualSpace::print() {
|
|
165 print_on(tty);
|
|
166 }
|
|
167 #endif
|