1 /*
2 * Copyright (c) 2001, 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.
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23 */
24
25 #ifndef SHARE_GC_G1_G1COLLECTEDHEAP_INLINE_HPP
26 #define SHARE_GC_G1_G1COLLECTEDHEAP_INLINE_HPP
27
28 #include "gc/g1/g1BarrierSet.hpp"
29 #include "gc/g1/g1CollectedHeap.hpp"
30 #include "gc/g1/g1CollectorState.hpp"
31 #include "gc/g1/g1Policy.hpp"
32 #include "gc/g1/g1RemSet.hpp"
33 #include "gc/g1/heapRegionManager.inline.hpp"
34 #include "gc/g1/heapRegionRemSet.hpp"
35 #include "gc/g1/heapRegionSet.inline.hpp"
36 #include "gc/shared/taskqueue.inline.hpp"
37
38 G1GCPhaseTimes* G1CollectedHeap::phase_times() const {
39 return _policy->phase_times();
40 }
41
42 G1EvacStats* G1CollectedHeap::alloc_buffer_stats(G1HeapRegionAttr dest) {
43 switch (dest.type()) {
44 case G1HeapRegionAttr::Young:
45 return &_survivor_evac_stats;
46 case G1HeapRegionAttr::Old:
47 return &_old_evac_stats;
48 default:
49 ShouldNotReachHere();
50 return NULL; // Keep some compilers happy
51 }
52 }
53
54 size_t G1CollectedHeap::desired_plab_sz(G1HeapRegionAttr dest) {
55 size_t gclab_word_size = alloc_buffer_stats(dest)->desired_plab_sz(workers()->active_workers());
56 // Prevent humongous PLAB sizes for two reasons:
57 // * PLABs are allocated using a similar paths as oops, but should
58 // never be in a humongous region
59 // * Allowing humongous PLABs needlessly churns the region free lists
60 return MIN2(_humongous_object_threshold_in_words, gclab_word_size);
61 }
62
63 // Inline functions for G1CollectedHeap
64
65 // Return the region with the given index. It assumes the index is valid.
66 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm->at(index); }
67
68 // Return the region with the given index, or NULL if unmapped. It assumes the index is valid.
69 inline HeapRegion* G1CollectedHeap::region_at_or_null(uint index) const { return _hrm->at_or_null(index); }
70
71 inline HeapRegion* G1CollectedHeap::next_region_in_humongous(HeapRegion* hr) const {
72 return _hrm->next_region_in_humongous(hr);
73 }
74
75 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
76 assert(is_in_reserved(addr),
77 "Cannot calculate region index for address " PTR_FORMAT " that is outside of the heap [" PTR_FORMAT ", " PTR_FORMAT ")",
78 p2i(addr), p2i(reserved_region().start()), p2i(reserved_region().end()));
79 return (uint)(pointer_delta(addr, reserved_region().start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);
80 }
81
82 inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const {
83 return _hrm->reserved().start() + index * HeapRegion::GrainWords;
84 }
85
86 template <class T>
87 inline HeapRegion* G1CollectedHeap::heap_region_containing(const T addr) const {
88 assert(addr != NULL, "invariant");
89 assert(is_in_g1_reserved((const void*) addr),
90 "Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")",
91 p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end()));
92 return _hrm->addr_to_region((HeapWord*) addr);
93 }
94
95 template <class T>
96 inline HeapRegion* G1CollectedHeap::heap_region_containing_or_null(const T addr) const {
97 assert(addr != NULL, "invariant");
98 assert(is_in_g1_reserved((const void*) addr),
99 "Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")",
100 p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end()));
101 uint const region_idx = addr_to_region(addr);
102 return region_at_or_null(region_idx);
103 }
104
105 inline void G1CollectedHeap::old_set_add(HeapRegion* hr) {
106 _old_set.add(hr);
107 }
108
109 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
110 _old_set.remove(hr);
111 }
112
113 inline void G1CollectedHeap::archive_set_add(HeapRegion* hr) {
114 _archive_set.add(hr);
115 }
116
117 // It dirties the cards that cover the block so that the post
118 // write barrier never queues anything when updating objects on this
119 // block. It is assumed (and in fact we assert) that the block
120 // belongs to a young region.
121 inline void
122 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
123 assert_heap_not_locked();
124
125 // Assign the containing region to containing_hr so that we don't
126 // have to keep calling heap_region_containing() in the
127 // asserts below.
128 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing(start);)
129 assert(word_size > 0, "pre-condition");
130 assert(containing_hr->is_in(start), "it should contain start");
131 assert(containing_hr->is_young(), "it should be young");
132 assert(!containing_hr->is_humongous(), "it should not be humongous");
133
134 HeapWord* end = start + word_size;
135 assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
136
137 MemRegion mr(start, end);
138 card_table()->g1_mark_as_young(mr);
139 }
140
141 inline RefToScanQueue* G1CollectedHeap::task_queue(uint i) const {
142 return _task_queues->queue(i);
143 }
144
145 inline bool G1CollectedHeap::is_marked_next(oop obj) const {
146 return _cm->next_mark_bitmap()->is_marked((HeapWord*)obj);
147 }
148
149 inline bool G1CollectedHeap::is_in_cset(oop obj) {
150 return is_in_cset((HeapWord*)obj);
151 }
152
153 inline bool G1CollectedHeap::is_in_cset(HeapWord* addr) {
154 return _region_attr.is_in_cset(addr);
155 }
156
157 bool G1CollectedHeap::is_in_cset(const HeapRegion* hr) {
158 return _region_attr.is_in_cset(hr);
159 }
160
161 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {
162 return _region_attr.is_in_cset_or_humongous((HeapWord*)obj);
163 }
164
165 G1HeapRegionAttr G1CollectedHeap::region_attr(const void* addr) const {
166 return _region_attr.at((HeapWord*)addr);
167 }
168
169 G1HeapRegionAttr G1CollectedHeap::region_attr(uint idx) const {
170 return _region_attr.get_by_index(idx);
171 }
172
173 void G1CollectedHeap::register_humongous_region_with_region_attr(uint index) {
174 _region_attr.set_humongous(index, region_at(index)->rem_set()->is_tracked());
175 }
176
177 void G1CollectedHeap::register_region_with_region_attr(HeapRegion* r) {
178 _region_attr.set_has_remset(r->hrm_index(), r->rem_set()->is_tracked());
179 }
180
181 void G1CollectedHeap::register_old_region_with_region_attr(HeapRegion* r) {
182 _region_attr.set_in_old(r->hrm_index(), r->rem_set()->is_tracked());
183 _rem_set->prepare_for_scan_heap_roots(r->hrm_index());
184 }
185
186 void G1CollectedHeap::register_optional_region_with_region_attr(HeapRegion* r) {
187 _region_attr.set_optional(r->hrm_index(), r->rem_set()->is_tracked());
188 }
189
190 #ifndef PRODUCT
191 // Support for G1EvacuationFailureALot
192
193 inline bool
194 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool for_young_gc,
195 bool during_initial_mark,
196 bool mark_or_rebuild_in_progress) {
197 bool res = false;
198 if (mark_or_rebuild_in_progress) {
199 res |= G1EvacuationFailureALotDuringConcMark;
200 }
201 if (during_initial_mark) {
202 res |= G1EvacuationFailureALotDuringInitialMark;
203 }
204 if (for_young_gc) {
205 res |= G1EvacuationFailureALotDuringYoungGC;
206 } else {
207 // GCs are mixed
208 res |= G1EvacuationFailureALotDuringMixedGC;
209 }
210 return res;
211 }
212
213 inline void
214 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
215 if (G1EvacuationFailureALot) {
216 // Note we can't assert that _evacuation_failure_alot_for_current_gc
217 // is clear here. It may have been set during a previous GC but that GC
218 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
219 // trigger an evacuation failure and clear the flags and and counts.
220
221 // Check if we have gone over the interval.
222 const size_t gc_num = total_collections();
223 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
224
225 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
226
227 // Now check if G1EvacuationFailureALot is enabled for the current GC type.
228 const bool in_young_only_phase = collector_state()->in_young_only_phase();
229 const bool in_initial_mark_gc = collector_state()->in_initial_mark_gc();
230 const bool mark_or_rebuild_in_progress = collector_state()->mark_or_rebuild_in_progress();
231
232 _evacuation_failure_alot_for_current_gc &=
233 evacuation_failure_alot_for_gc_type(in_young_only_phase,
234 in_initial_mark_gc,
235 mark_or_rebuild_in_progress);
236 }
237 }
238
239 inline bool G1CollectedHeap::evacuation_should_fail() {
240 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
241 return false;
242 }
243 // G1EvacuationFailureALot is in effect for current GC
244 // Access to _evacuation_failure_alot_count is not atomic;
245 // the value does not have to be exact.
246 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
247 return false;
248 }
249 _evacuation_failure_alot_count = 0;
250 return true;
251 }
252
253 inline void G1CollectedHeap::reset_evacuation_should_fail() {
254 if (G1EvacuationFailureALot) {
255 _evacuation_failure_alot_gc_number = total_collections();
256 _evacuation_failure_alot_count = 0;
257 _evacuation_failure_alot_for_current_gc = false;
258 }
259 }
260 #endif // #ifndef PRODUCT
261
262 inline bool G1CollectedHeap::is_in_young(const oop obj) {
263 if (obj == NULL) {
264 return false;
265 }
266 return heap_region_containing(obj)->is_young();
267 }
268
269 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
270 if (obj == NULL) {
271 return false;
272 }
273 return is_obj_dead(obj, heap_region_containing(obj));
274 }
275
276 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
277 if (obj == NULL) {
278 return false;
279 }
280 return is_obj_ill(obj, heap_region_containing(obj));
281 }
282
283 inline bool G1CollectedHeap::is_obj_dead_full(const oop obj, const HeapRegion* hr) const {
284 return !is_marked_next(obj) && !hr->is_archive();
285 }
286
287 inline bool G1CollectedHeap::is_obj_dead_full(const oop obj) const {
288 return is_obj_dead_full(obj, heap_region_containing(obj));
289 }
290
291 inline void G1CollectedHeap::set_humongous_reclaim_candidate(uint region, bool value) {
292 assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object");
293 _humongous_reclaim_candidates.set_candidate(region, value);
294 }
295
296 inline bool G1CollectedHeap::is_humongous_reclaim_candidate(uint region) {
297 assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object");
298 return _humongous_reclaim_candidates.is_candidate(region);
299 }
300
301 inline void G1CollectedHeap::set_humongous_is_live(oop obj) {
302 uint region = addr_to_region((HeapWord*)obj);
303 // Clear the flag in the humongous_reclaim_candidates table. Also
304 // reset the entry in the region attribute table so that subsequent references
305 // to the same humongous object do not go into the slow path again.
306 // This is racy, as multiple threads may at the same time enter here, but this
307 // is benign.
308 // During collection we only ever clear the "candidate" flag, and only ever clear the
309 // entry in the in_cset_fast_table.
310 // We only ever evaluate the contents of these tables (in the VM thread) after
311 // having synchronized the worker threads with the VM thread, or in the same
312 // thread (i.e. within the VM thread).
313 if (is_humongous_reclaim_candidate(region)) {
314 set_humongous_reclaim_candidate(region, false);
315 _region_attr.clear_humongous(region);
316 }
317 }
318
319 #endif // SHARE_GC_G1_G1COLLECTEDHEAP_INLINE_HPP