1/*
2 * Copyright (c) 2011, 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#include "precompiled.hpp"
26#include "gc/g1/g1CollectedHeap.inline.hpp"
27#include "gc/g1/g1MonitoringSupport.hpp"
28#include "gc/g1/g1Policy.hpp"
29#include "gc/g1/g1MemoryPool.hpp"
30#include "gc/shared/hSpaceCounters.hpp"
31#include "memory/metaspaceCounters.hpp"
32#include "services/memoryPool.hpp"
33
34class G1GenerationCounters : public GenerationCounters {
35protected:
36 G1MonitoringSupport* _g1mm;
37
38public:
39 G1GenerationCounters(G1MonitoringSupport* g1mm,
40 const char* name, int ordinal, int spaces,
41 size_t min_capacity, size_t max_capacity,
42 size_t curr_capacity)
43 : GenerationCounters(name, ordinal, spaces, min_capacity,
44 max_capacity, curr_capacity), _g1mm(g1mm) { }
45};
46
47class G1YoungGenerationCounters : public G1GenerationCounters {
48public:
49 // We pad the capacity three times given that the young generation
50 // contains three spaces (eden and two survivors).
51 G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
52 : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */,
53 G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */,
54 G1MonitoringSupport::pad_capacity(max_size, 3),
55 G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) {
56 if (UsePerfData) {
57 update_all();
58 }
59 }
60
61 virtual void update_all() {
62 size_t committed =
63 G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3);
64 _current_size->set_value(committed);
65 }
66};
67
68class G1OldGenerationCounters : public G1GenerationCounters {
69public:
70 G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
71 : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
72 G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
73 G1MonitoringSupport::pad_capacity(max_size),
74 G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
75 if (UsePerfData) {
76 update_all();
77 }
78 }
79
80 virtual void update_all() {
81 size_t committed =
82 G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
83 _current_size->set_value(committed);
84 }
85};
86
87G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
88 _g1h(g1h),
89 _incremental_memory_manager("G1 Young Generation", "end of minor GC"),
90 _full_gc_memory_manager("G1 Old Generation", "end of major GC"),
91 _eden_space_pool(NULL),
92 _survivor_space_pool(NULL),
93 _old_gen_pool(NULL),
94 _incremental_collection_counters(NULL),
95 _full_collection_counters(NULL),
96 _conc_collection_counters(NULL),
97 _young_gen_counters(NULL),
98 _old_gen_counters(NULL),
99 _old_space_counters(NULL),
100 _eden_space_counters(NULL),
101 _from_space_counters(NULL),
102 _to_space_counters(NULL),
103
104 _overall_committed(0),
105 _overall_used(0),
106 _young_gen_committed(0),
107 _old_gen_committed(0),
108
109 _eden_space_committed(0),
110 _eden_space_used(0),
111 _survivor_space_committed(0),
112 _survivor_space_used(0),
113 _old_gen_used(0) {
114
115 recalculate_sizes();
116
117 // Counters for garbage collections
118 //
119 // name "collector.0". In a generational collector this would be the
120 // young generation collection.
121 _incremental_collection_counters =
122 new CollectorCounters("G1 young collection pauses", 0);
123 // name "collector.1". In a generational collector this would be the
124 // old generation collection.
125 _full_collection_counters =
126 new CollectorCounters("G1 full collection pauses", 1);
127 // name "collector.2". In a generational collector this would be the
128 // STW phases in concurrent collection.
129 _conc_collection_counters =
130 new CollectorCounters("G1 concurrent cycle pauses", 2);
131
132 // "Generation" and "Space" counters.
133 //
134 // name "generation.1" This is logically the old generation in
135 // generational GC terms. The "1, 1" parameters are for
136 // the n-th generation (=1) with 1 space.
137 // Counters are created from minCapacity, maxCapacity, and capacity
138 _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity());
139
140 // name "generation.1.space.0"
141 // Counters are created from maxCapacity, capacity, initCapacity,
142 // and used.
143 _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(),
144 "space", 0 /* ordinal */,
145 pad_capacity(g1h->max_capacity()) /* max_capacity */,
146 pad_capacity(_old_gen_committed) /* init_capacity */);
147
148 // Young collection set
149 // name "generation.0". This is logically the young generation.
150 // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
151 // See _old_collection_counters for additional counters
152 _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity());
153
154 const char* young_collection_name_space = _young_gen_counters->name_space();
155
156 // name "generation.0.space.0"
157 // See _old_space_counters for additional counters
158 _eden_space_counters = new HSpaceCounters(young_collection_name_space,
159 "eden", 0 /* ordinal */,
160 pad_capacity(g1h->max_capacity()) /* max_capacity */,
161 pad_capacity(_eden_space_committed) /* init_capacity */);
162
163 // name "generation.0.space.1"
164 // See _old_space_counters for additional counters
165 // Set the arguments to indicate that this survivor space is not used.
166 _from_space_counters = new HSpaceCounters(young_collection_name_space,
167 "s0", 1 /* ordinal */,
168 pad_capacity(0) /* max_capacity */,
169 pad_capacity(0) /* init_capacity */);
170 // Given that this survivor space is not used, we update it here
171 // once to reflect that its used space is 0 so that we don't have to
172 // worry about updating it again later.
173 if (UsePerfData) {
174 _from_space_counters->update_used(0);
175 }
176
177 // name "generation.0.space.2"
178 // See _old_space_counters for additional counters
179 _to_space_counters = new HSpaceCounters(young_collection_name_space,
180 "s1", 2 /* ordinal */,
181 pad_capacity(g1h->max_capacity()) /* max_capacity */,
182 pad_capacity(_survivor_space_committed) /* init_capacity */);
183}
184
185G1MonitoringSupport::~G1MonitoringSupport() {
186 delete _eden_space_pool;
187 delete _survivor_space_pool;
188 delete _old_gen_pool;
189}
190
191void G1MonitoringSupport::initialize_serviceability() {
192 _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed);
193 _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed);
194 _old_gen_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity());
195
196 _full_gc_memory_manager.add_pool(_eden_space_pool);
197 _full_gc_memory_manager.add_pool(_survivor_space_pool);
198 _full_gc_memory_manager.add_pool(_old_gen_pool);
199
200 _incremental_memory_manager.add_pool(_eden_space_pool);
201 _incremental_memory_manager.add_pool(_survivor_space_pool);
202 _incremental_memory_manager.add_pool(_old_gen_pool, false /* always_affected_by_gc */);
203}
204
205MemoryUsage G1MonitoringSupport::memory_usage() {
206 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
207 return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity());
208}
209
210GrowableArray<GCMemoryManager*> G1MonitoringSupport::memory_managers() {
211 GrowableArray<GCMemoryManager*> memory_managers(2);
212 memory_managers.append(&_incremental_memory_manager);
213 memory_managers.append(&_full_gc_memory_manager);
214 return memory_managers;
215}
216
217GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() {
218 GrowableArray<MemoryPool*> memory_pools(3);
219 memory_pools.append(_eden_space_pool);
220 memory_pools.append(_survivor_space_pool);
221 memory_pools.append(_old_gen_pool);
222 return memory_pools;
223}
224
225void G1MonitoringSupport::recalculate_sizes() {
226 assert_heap_locked_or_at_safepoint(true);
227
228 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
229 // Recalculate all the sizes from scratch.
230
231 // This never includes used bytes of current allocating heap region.
232 _overall_used = _g1h->used_unlocked();
233 _eden_space_used = _g1h->eden_regions_used_bytes();
234 _survivor_space_used = _g1h->survivor_regions_used_bytes();
235
236 // _overall_used and _eden_space_used are obtained concurrently so
237 // may be inconsistent with each other. To prevent _old_gen_used going negative,
238 // use smaller value to substract.
239 _old_gen_used = _overall_used - MIN2(_overall_used, _eden_space_used + _survivor_space_used);
240
241 uint survivor_list_length = _g1h->survivor_regions_count();
242 // Max length includes any potential extensions to the young gen
243 // we'll do when the GC locker is active.
244 uint young_list_max_length = _g1h->policy()->young_list_max_length();
245 assert(young_list_max_length >= survivor_list_length, "invariant");
246 uint eden_list_max_length = young_list_max_length - survivor_list_length;
247
248 // First calculate the committed sizes that can be calculated independently.
249 _survivor_space_committed = survivor_list_length * HeapRegion::GrainBytes;
250 _old_gen_committed = HeapRegion::align_up_to_region_byte_size(_old_gen_used);
251
252 // Next, start with the overall committed size.
253 _overall_committed = _g1h->capacity();
254 size_t committed = _overall_committed;
255
256 // Remove the committed size we have calculated so far (for the
257 // survivor and old space).
258 assert(committed >= (_survivor_space_committed + _old_gen_committed), "sanity");
259 committed -= _survivor_space_committed + _old_gen_committed;
260
261 // Next, calculate and remove the committed size for the eden.
262 _eden_space_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
263 // Somewhat defensive: be robust in case there are inaccuracies in
264 // the calculations
265 _eden_space_committed = MIN2(_eden_space_committed, committed);
266 committed -= _eden_space_committed;
267
268 // Finally, give the rest to the old space...
269 _old_gen_committed += committed;
270 // ..and calculate the young gen committed.
271 _young_gen_committed = _eden_space_committed + _survivor_space_committed;
272
273 assert(_overall_committed ==
274 (_eden_space_committed + _survivor_space_committed + _old_gen_committed),
275 "the committed sizes should add up");
276 // Somewhat defensive: cap the eden used size to make sure it
277 // never exceeds the committed size.
278 _eden_space_used = MIN2(_eden_space_used, _eden_space_committed);
279 // _survivor_space_used is calculated during a safepoint and _survivor_space_committed
280 // is calculated from survivor region count * heap region size.
281 assert(_survivor_space_used <= _survivor_space_committed, "Survivor used bytes(" SIZE_FORMAT
282 ") should be less than or equal to survivor committed(" SIZE_FORMAT ")",
283 _survivor_space_used, _survivor_space_committed);
284 // _old_gen_committed is calculated in terms of _old_gen_used value.
285 assert(_old_gen_used <= _old_gen_committed, "Old gen used bytes(" SIZE_FORMAT
286 ") should be less than or equal to old gen committed(" SIZE_FORMAT ")",
287 _old_gen_used, _old_gen_committed);
288}
289
290void G1MonitoringSupport::update_sizes() {
291 recalculate_sizes();
292 if (UsePerfData) {
293 _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
294 _eden_space_counters->update_used(_eden_space_used);
295 // only the "to" survivor space is active, so we don't need to
296 // update the counters for the "from" survivor space
297 _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed));
298 _to_space_counters->update_used(_survivor_space_used);
299 _old_space_counters->update_capacity(pad_capacity(_old_gen_committed));
300 _old_space_counters->update_used(_old_gen_used);
301
302 _young_gen_counters->update_all();
303 _old_gen_counters->update_all();
304
305 MetaspaceCounters::update_performance_counters();
306 CompressedClassSpaceCounters::update_performance_counters();
307 }
308}
309
310void G1MonitoringSupport::update_eden_size() {
311 // Recalculate everything - this should be fast enough and we are sure that we do not
312 // miss anything.
313 recalculate_sizes();
314 if (UsePerfData) {
315 _eden_space_counters->update_used(_eden_space_used);
316 }
317}
318
319MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) {
320 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
321
322 return MemoryUsage(initial_size,
323 _eden_space_used,
324 _eden_space_committed,
325 max_size);
326}
327
328MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) {
329 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
330
331 return MemoryUsage(initial_size,
332 _survivor_space_used,
333 _survivor_space_committed,
334 max_size);
335}
336
337MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) {
338 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
339
340 return MemoryUsage(initial_size,
341 _old_gen_used,
342 _old_gen_committed,
343 max_size);
344}
345
346G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool all_memory_pools_affected) :
347 _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters),
348 _tms(full_gc ? &g1mm->_full_gc_memory_manager : &g1mm->_incremental_memory_manager,
349 G1CollectedHeap::heap()->gc_cause(), all_memory_pools_affected) {
350}
351