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 uintptr_t ZPage::block_start(uintptr_t addr) const {
181 if (block_is_obj(addr)) {
182 return addr;
183 } else {
184 return ZAddress::good(top());
185 }
186 }
187
188 inline bool ZPage::block_is_obj(uintptr_t addr) const {
189 return ZAddress::offset(addr) < top();
190 }
191
192 inline bool ZPage::is_marked() const {
193 assert(is_relocatable(), "Invalid page state");
194 return _livemap.is_marked();
195 }
196
197 inline bool ZPage::is_object_marked(uintptr_t addr) const {
198 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
199 return _livemap.get(index);
200 }
201
202 inline bool ZPage::is_object_strongly_marked(uintptr_t addr) const {
203 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
204 return _livemap.get(index + 1);
205 }
206
207 inline bool ZPage::is_object_live(uintptr_t addr) const {
208 return is_allocating() || is_object_marked(addr);
209 }
210
211 inline bool ZPage::is_object_strongly_live(uintptr_t addr) const {
212 return is_allocating() || is_object_strongly_marked(addr);
213 }
214
215 inline bool ZPage::mark_object(uintptr_t addr, bool finalizable, bool& inc_live) {
216 assert(ZAddress::is_marked(addr), "Invalid address");
217 assert(is_relocatable(), "Invalid page state");
218 assert(is_in(addr), "Invalid address");
219
220 // Set mark bit
221 const size_t index = ((ZAddress::offset(addr) - start()) >> object_alignment_shift()) * 2;
222 return _livemap.set_atomic(index, finalizable, inc_live);
223 }
224
225 inline void ZPage::inc_live_atomic(uint32_t objects, size_t bytes) {
226 _livemap.inc_live_atomic(objects, bytes);
227 }
228
229 inline uint32_t ZPage::live_objects() const {
230 assert(is_marked(), "Should be marked");
231 return _livemap.live_objects();
232 }
233
234 inline size_t ZPage::live_bytes() const {
235 assert(is_marked(), "Should be marked");
236 return _livemap.live_bytes();
237 }
238
239 inline void ZPage::object_iterate(ObjectClosure* cl) {
240 _livemap.iterate(cl, ZAddress::good(start()), object_alignment_shift());
241 }
242
243 inline uintptr_t ZPage::alloc_object(size_t size) {
244 assert(is_allocating(), "Invalid state");
245
246 const size_t aligned_size = align_up(size, object_alignment());
247 const uintptr_t addr = top();
248 const uintptr_t new_top = addr + aligned_size;
249
250 if (new_top > end()) {
251 // Not enough space left
252 return 0;
253 }
254
255 _top = new_top;
256
257 return ZAddress::good(addr);
258 }
259
260 inline uintptr_t ZPage::alloc_object_atomic(size_t size) {
261 assert(is_allocating(), "Invalid state");
262
263 const size_t aligned_size = align_up(size, object_alignment());
264 uintptr_t addr = top();
265
266 for (;;) {
267 const uintptr_t new_top = addr + aligned_size;
268 if (new_top > end()) {
269 // Not enough space left
270 return 0;
271 }
272
273 const uintptr_t prev_top = Atomic::cmpxchg(new_top, &_top, addr);
274 if (prev_top == addr) {
275 // Success
276 return ZAddress::good(addr);
277 }
278
279 // Retry
280 addr = prev_top;
281 }
282 }
283
284 inline bool ZPage::undo_alloc_object(uintptr_t addr, size_t size) {
285 assert(is_allocating(), "Invalid state");
286
287 const uintptr_t offset = ZAddress::offset(addr);
288 const size_t aligned_size = align_up(size, object_alignment());
289 const uintptr_t old_top = top();
290 const uintptr_t new_top = old_top - aligned_size;
291
292 if (new_top != offset) {
293 // Failed to undo allocation, not the last allocated object
294 return false;
295 }
296
297 _top = new_top;
298
299 // Success
300 return true;
301 }
302
303 inline bool ZPage::undo_alloc_object_atomic(uintptr_t addr, size_t size) {
304 assert(is_allocating(), "Invalid state");
305
306 const uintptr_t offset = ZAddress::offset(addr);
307 const size_t aligned_size = align_up(size, object_alignment());
308 uintptr_t old_top = top();
309
310 for (;;) {
311 const uintptr_t new_top = old_top - aligned_size;
312 if (new_top != offset) {
313 // Failed to undo allocation, not the last allocated object
314 return false;
315 }
316
317 const uintptr_t prev_top = Atomic::cmpxchg(new_top, &_top, old_top);
318 if (prev_top == old_top) {
319 // Success
320 return true;
321 }
322
323 // Retry
324 old_top = prev_top;
325 }
326 }
327
328 #endif // SHARE_GC_Z_ZPAGE_INLINE_HPP