1 /*
2 * Copyright (c) 2015, 2019, 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 #ifndef SHARE_GC_Z_ZPAGE_INLINE_HPP
25 #define SHARE_GC_Z_ZPAGE_INLINE_HPP
26
27 #include "gc/z/zAddress.inline.hpp"
28 #include "gc/z/zGlobals.hpp"
29 #include "gc/z/zLiveMap.inline.hpp"
30 #include "gc/z/zMark.hpp"
31 #include "gc/z/zNUMA.hpp"
32 #include "gc/z/zPage.hpp"
33 #include "gc/z/zPhysicalMemory.inline.hpp"
34 #include "gc/z/zVirtualMemory.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "runtime/atomic.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/debug.hpp"
40
41 inline uint8_t ZPage::type_from_size(size_t size) const {
42 switch (size) {
43 case ZPageSizeSmall:
44 return ZPageTypeSmall;
45
46 case ZPageSizeMedium:
47 return ZPageTypeMedium;
48
49 default:
50 return ZPageTypeLarge;
51 }
52 }
53
54 inline const char* ZPage::type_to_string() const {
55 switch (type()) {
56 case ZPageTypeSmall:
57 return "Small";
58
59 case ZPageTypeMedium:
60 return "Medium";
61
62 default:
63 assert(type() == ZPageTypeLarge, "Invalid page type");
64 return "Large";
65 }
66 }
67
68 inline uint32_t ZPage::object_max_count() const {
69 switch (type()) {
70 case ZPageTypeLarge:
71 // A large page can only contain a single
72 // object aligned to the start of the page.
73 return 1;
74
75 default:
76 return (uint32_t)(size() >> object_alignment_shift());
77 }
78 }
79
80 inline size_t ZPage::object_alignment_shift() const {
81 switch (type()) {
82 case ZPageTypeSmall:
83 return ZObjectAlignmentSmallShift;
84
85 case ZPageTypeMedium:
86 return ZObjectAlignmentMediumShift;
87
88 default:
89 assert(type() == ZPageTypeLarge, "Invalid page type");
90 return ZObjectAlignmentLargeShift;
91 }
92 }
93
94 inline size_t ZPage::object_alignment() const {
95 switch (type()) {
96 case ZPageTypeSmall:
97 return ZObjectAlignmentSmall;
98
99 case ZPageTypeMedium:
100 return ZObjectAlignmentMedium;
101
102 default:
103 assert(type() == ZPageTypeLarge, "Invalid page type");
104 return ZObjectAlignmentLarge;
105 }
106 }
107
108 inline uint8_t ZPage::type() const {
109 return _type;
110 }
111
112 inline uintptr_t ZPage::start() const {
113 return _virtual.start();
114 }
115
116 inline uintptr_t ZPage::end() const {
117 return _virtual.end();
118 }
119
120 inline size_t ZPage::size() const {
121 return _virtual.size();
122 }
123
124 inline uintptr_t ZPage::top() const {
125 return _top;
126 }
127
128 inline size_t ZPage::remaining() const {
129 return end() - top();
130 }
131
132 inline const ZPhysicalMemory& ZPage::physical_memory() const {
133 return _physical;
134 }
135
136 inline const ZVirtualMemory& ZPage::virtual_memory() const {
137 return _virtual;
138 }
139
140 inline uint8_t ZPage::numa_id() {
141 if (_numa_id == (uint8_t)-1) {
142 _numa_id = (uint8_t)ZNUMA::memory_id(ZAddress::good(start()));
143 }
144
145 return _numa_id;
146 }
147
148 inline bool ZPage::is_allocating() const {
149 return _seqnum == ZGlobalSeqNum;
150 }
151
152 inline bool ZPage::is_relocatable() const {
153 return _seqnum < ZGlobalSeqNum;
154 }
155
156 inline bool ZPage::is_mapped() const {
157 return _seqnum > 0;
158 }
159
160 inline void ZPage::set_pre_mapped() {
161 // The _seqnum variable is also used to signal that the virtual and physical
162 // memory has been mapped. So, we need to set it to non-zero when the memory
163 // has been pre-mapped.
164 _seqnum = 1;
165 }
166
167 inline uint64_t ZPage::last_used() const {
168 return _last_used;
169 }
170
171 inline void ZPage::set_last_used() {
172 _last_used = os::elapsedTime();
173 }
174
175 inline bool ZPage::is_in(uintptr_t addr) const {
176 const uintptr_t offset = ZAddress::offset(addr);
177 return offset >= start() && offset < top();
178 }
179
180 inline bool ZPage::is_marked() const {
181 assert(is_relocatable(), "Invalid page state");
182 return _livemap.is_marked();
183 }
184
185 inline bool ZPage::is_object_marked(uintptr_t addr) const {
186 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
187 return _livemap.get(index);
188 }
189
190 inline bool ZPage::is_object_strongly_marked(uintptr_t addr) const {
191 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
192 return _livemap.get(index + 1);
193 }
194
195 inline bool ZPage::is_object_live(uintptr_t addr) const {
196 return is_allocating() || is_object_marked(addr);
197 }
198
199 inline bool ZPage::is_object_strongly_live(uintptr_t addr) const {
200 return is_allocating() || is_object_strongly_marked(addr);
201 }
202
203 inline bool ZPage::mark_object(uintptr_t addr, bool finalizable, bool& inc_live) {
204 assert(ZAddress::is_marked(addr), "Invalid address");
205 assert(is_relocatable(), "Invalid page state");
206 assert(is_in(addr), "Invalid address");
207
208 // Set mark bit
209 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
210 return _livemap.set_atomic(index, finalizable, inc_live);
211 }
212
213 inline void ZPage::inc_live_atomic(uint32_t objects, size_t bytes) {
214 _livemap.inc_live_atomic(objects, bytes);
215 }
216
217 inline uint32_t ZPage::live_objects() const {
218 assert(is_marked(), "Should be marked");
219 return _livemap.live_objects();
220 }
221
222 inline size_t ZPage::live_bytes() const {
223 assert(is_marked(), "Should be marked");
224 return _livemap.live_bytes();
225 }
226
227 inline void ZPage::object_iterate(ObjectClosure* cl) {
228 _livemap.iterate(cl, ZAddress::good(start()), object_alignment_shift());
229 }
230
231 inline uintptr_t ZPage::alloc_object(size_t size) {
232 assert(is_allocating(), "Invalid state");
233
234 const size_t aligned_size = align_up(size, object_alignment());
235 const uintptr_t addr = top();
236 const uintptr_t new_top = addr + aligned_size;
237
238 if (new_top > end()) {
239 // Not enough space left
240 return 0;
241 }
242
243 _top = new_top;
244
245 return ZAddress::good(addr);
246 }
247
248 inline uintptr_t ZPage::alloc_object_atomic(size_t size) {
249 assert(is_allocating(), "Invalid state");
250
251 const size_t aligned_size = align_up(size, object_alignment());
252 uintptr_t addr = top();
253
254 for (;;) {
255 const uintptr_t new_top = addr + aligned_size;
256 if (new_top > end()) {
257 // Not enough space left
258 return 0;
259 }
260
261 const uintptr_t prev_top = Atomic::cmpxchg(new_top, &_top, addr);
262 if (prev_top == addr) {
263 // Success
264 return ZAddress::good(addr);
265 }
266
267 // Retry
268 addr = prev_top;
269 }
270 }
271
272 inline bool ZPage::undo_alloc_object(uintptr_t addr, size_t size) {
273 assert(is_allocating(), "Invalid state");
274
275 const uintptr_t offset = ZAddress::offset(addr);
276 const size_t aligned_size = align_up(size, object_alignment());
277 const uintptr_t old_top = top();
278 const uintptr_t new_top = old_top - aligned_size;
279
280 if (new_top != offset) {
281 // Failed to undo allocation, not the last allocated object
282 return false;
283 }
284
285 _top = new_top;
286
287 // Success
288 return true;
289 }
290
291 inline bool ZPage::undo_alloc_object_atomic(uintptr_t addr, size_t size) {
292 assert(is_allocating(), "Invalid state");
293
294 const uintptr_t offset = ZAddress::offset(addr);
295 const size_t aligned_size = align_up(size, object_alignment());
296 uintptr_t old_top = top();
297
298 for (;;) {
299 const uintptr_t new_top = old_top - aligned_size;
300 if (new_top != offset) {
301 // Failed to undo allocation, not the last allocated object
302 return false;
303 }
304
305 const uintptr_t prev_top = Atomic::cmpxchg(new_top, &_top, old_top);
306 if (prev_top == old_top) {
307 // Success
308 return true;
309 }
310
311 // Retry
312 old_top = prev_top;
313 }
314 }
315
316 #endif // SHARE_GC_Z_ZPAGE_INLINE_HPP