Wed, 14 Jun 2017 15:07:28 +0800
sync on gs464e
1 /*
2 * Copyright (c) 2002, 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 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
28 #include "gc_implementation/parallelScavenge/psOldGen.hpp"
29 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
30 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
31 #include "oops/oop.psgc.inline.hpp"
33 inline PSPromotionManager* PSPromotionManager::manager_array(int index) {
34 assert(_manager_array != NULL, "access of NULL manager_array");
35 assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access");
36 return &_manager_array[index];
37 }
39 template <class T>
40 inline void PSPromotionManager::claim_or_forward_internal_depth(T* p) {
41 if (p != NULL) { // XXX: error if p != NULL here
42 oop o = oopDesc::load_decode_heap_oop_not_null(p);
43 if (o->is_forwarded()) {
44 o = o->forwardee();
45 // Card mark
46 if (PSScavenge::is_obj_in_young(o)) {
47 PSScavenge::card_table()->inline_write_ref_field_gc(p, o);
48 }
49 oopDesc::encode_store_heap_oop_not_null(p, o);
50 } else {
51 push_depth(p);
52 }
53 }
54 }
56 template <class T>
57 inline void PSPromotionManager::claim_or_forward_depth(T* p) {
58 assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
59 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap,
60 "Sanity");
61 assert(Universe::heap()->is_in(p), "pointer outside heap");
63 claim_or_forward_internal_depth(p);
64 }
66 //
67 // This method is pretty bulky. It would be nice to split it up
68 // into smaller submethods, but we need to be careful not to hurt
69 // performance.
70 //
71 template<bool promote_immediately>
72 oop PSPromotionManager::copy_to_survivor_space(oop o) {
73 assert(PSScavenge::should_scavenge(&o), "Sanity");
75 oop new_obj = NULL;
77 #ifdef MIPS64
78 if (Use3A2000) OrderAccess::fence();
79 #endif
81 // NOTE! We must be very careful with any methods that access the mark
82 // in o. There may be multiple threads racing on it, and it may be forwarded
83 // at any time. Do not use oop methods for accessing the mark!
84 markOop test_mark = o->mark();
86 // The same test as "o->is_forwarded()"
87 if (!test_mark->is_marked()) {
88 bool new_obj_is_tenured = false;
89 size_t new_obj_size = o->size();
91 if (!promote_immediately) {
92 // Find the objects age, MT safe.
93 uint age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
94 test_mark->displaced_mark_helper()->age() : test_mark->age();
96 // Try allocating obj in to-space (unless too old)
97 if (age < PSScavenge::tenuring_threshold()) {
98 new_obj = (oop) _young_lab.allocate(new_obj_size);
99 if (new_obj == NULL && !_young_gen_is_full) {
100 // Do we allocate directly, or flush and refill?
101 if (new_obj_size > (YoungPLABSize / 2)) {
102 // Allocate this object directly
103 new_obj = (oop)young_space()->cas_allocate(new_obj_size);
104 } else {
105 // Flush and fill
106 _young_lab.flush();
108 HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize);
109 if (lab_base != NULL) {
110 _young_lab.initialize(MemRegion(lab_base, YoungPLABSize));
111 // Try the young lab allocation again.
112 new_obj = (oop) _young_lab.allocate(new_obj_size);
113 } else {
114 _young_gen_is_full = true;
115 }
116 }
117 }
119 #ifdef MIPS64
120 if (Use3A2000) OrderAccess::fence();
121 #endif
122 }
123 }
125 // Otherwise try allocating obj tenured
126 if (new_obj == NULL) {
127 #ifndef PRODUCT
128 if (Universe::heap()->promotion_should_fail()) {
129 return oop_promotion_failed(o, test_mark);
130 }
131 #endif // #ifndef PRODUCT
133 new_obj = (oop) _old_lab.allocate(new_obj_size);
134 new_obj_is_tenured = true;
136 if (new_obj == NULL) {
137 if (!_old_gen_is_full) {
138 // Do we allocate directly, or flush and refill?
139 if (new_obj_size > (OldPLABSize / 2)) {
140 // Allocate this object directly
141 new_obj = (oop)old_gen()->cas_allocate(new_obj_size);
142 } else {
143 // Flush and fill
144 _old_lab.flush();
146 HeapWord* lab_base = old_gen()->cas_allocate(OldPLABSize);
147 if(lab_base != NULL) {
148 #ifdef ASSERT
149 // Delay the initialization of the promotion lab (plab).
150 // This exposes uninitialized plabs to card table processing.
151 if (GCWorkerDelayMillis > 0) {
152 os::sleep(Thread::current(), GCWorkerDelayMillis, false);
153 }
154 #endif
155 _old_lab.initialize(MemRegion(lab_base, OldPLABSize));
156 // Try the old lab allocation again.
157 new_obj = (oop) _old_lab.allocate(new_obj_size);
158 }
159 }
160 }
162 // This is the promotion failed test, and code handling.
163 // The code belongs here for two reasons. It is slightly
164 // different than the code below, and cannot share the
165 // CAS testing code. Keeping the code here also minimizes
166 // the impact on the common case fast path code.
168 if (new_obj == NULL) {
169 _old_gen_is_full = true;
170 return oop_promotion_failed(o, test_mark);
171 #ifdef MIPS64
172 if (Use3A2000) OrderAccess::fence();
173 #endif
174 }
175 }
176 }
178 assert(new_obj != NULL, "allocation should have succeeded");
180 // Copy obj
181 Copy::aligned_disjoint_words((HeapWord*)o, (HeapWord*)new_obj, new_obj_size);
182 #ifdef MIPS64
183 if (Use3A2000) OrderAccess::fence();
184 #endif
186 // Now we have to CAS in the header.
187 if (o->cas_forward_to(new_obj, test_mark)) {
188 // We won any races, we "own" this object.
189 assert(new_obj == o->forwardee(), "Sanity");
191 // Increment age if obj still in new generation. Now that
192 // we're dealing with a markOop that cannot change, it is
193 // okay to use the non mt safe oop methods.
194 if (!new_obj_is_tenured) {
195 new_obj->incr_age();
196 assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj");
197 }
199 // Do the size comparison first with new_obj_size, which we
200 // already have. Hopefully, only a few objects are larger than
201 // _min_array_size_for_chunking, and most of them will be arrays.
202 // So, the is->objArray() test would be very infrequent.
203 if (new_obj_size > _min_array_size_for_chunking &&
204 new_obj->is_objArray() &&
205 PSChunkLargeArrays) {
206 // we'll chunk it
207 oop* const masked_o = mask_chunked_array_oop(o);
208 push_depth(masked_o);
209 TASKQUEUE_STATS_ONLY(++_arrays_chunked; ++_masked_pushes);
210 } else {
211 // we'll just push its contents
212 new_obj->push_contents(this);
213 }
214 } else {
215 // We lost, someone else "owns" this object
216 guarantee(o->is_forwarded(), "Object must be forwarded if the cas failed.");
218 // Try to deallocate the space. If it was directly allocated we cannot
219 // deallocate it, so we have to test. If the deallocation fails,
220 // overwrite with a filler object.
221 if (new_obj_is_tenured) {
222 if (!_old_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
223 CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
224 }
225 } else if (!_young_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
226 CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
227 }
229 // don't update this before the unallocation!
230 new_obj = o->forwardee();
231 }
233 #ifdef MIPS64
234 if (Use3A2000) OrderAccess::fence();
235 #endif
236 } else {
237 assert(o->is_forwarded(), "Sanity");
238 new_obj = o->forwardee();
239 }
241 #ifndef PRODUCT
242 // This code must come after the CAS test, or it will print incorrect
243 // information.
244 if (TraceScavenge) {
245 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
246 PSScavenge::should_scavenge(&new_obj) ? "copying" : "tenuring",
247 new_obj->klass()->internal_name(), p2i((void *)o), p2i((void *)new_obj), new_obj->size());
248 }
249 #endif
251 return new_obj;
252 }
255 inline void PSPromotionManager::process_popped_location_depth(StarTask p) {
256 if (is_oop_masked(p)) {
257 assert(PSChunkLargeArrays, "invariant");
258 oop const old = unmask_chunked_array_oop(p);
259 process_array_chunk(old);
260 } else {
261 if (p.is_narrow()) {
262 assert(UseCompressedOops, "Error");
263 PSScavenge::copy_and_push_safe_barrier<narrowOop, /*promote_immediately=*/false>(this, p);
264 } else {
265 PSScavenge::copy_and_push_safe_barrier<oop, /*promote_immediately=*/false>(this, p);
266 }
267 }
268 }
270 #if TASKQUEUE_STATS
271 void PSPromotionManager::record_steal(StarTask& p) {
272 if (is_oop_masked(p)) {
273 ++_masked_steals;
274 }
275 }
276 #endif // TASKQUEUE_STATS
278 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP