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.
22 *
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 "runtime/mutexLocker.inline.hpp"
33 #include "services/memoryPool.hpp"
34
35 class G1GenerationCounters : public GenerationCounters {
36 protected:
37 G1MonitoringSupport* _g1mm;
38
39 public:
40 G1GenerationCounters(G1MonitoringSupport* g1mm,
41 const char* name, int ordinal, int spaces,
42 size_t min_capacity, size_t max_capacity,
43 size_t curr_capacity)
44 : GenerationCounters(name, ordinal, spaces, min_capacity,
45 max_capacity, curr_capacity), _g1mm(g1mm) { }
46 };
47
48 class G1YoungGenerationCounters : public G1GenerationCounters {
49 public:
50 // We pad the capacity three times given that the young generation
51 // contains three spaces (eden and two survivors).
52 G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
53 : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */,
54 G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */,
55 G1MonitoringSupport::pad_capacity(max_size, 3),
56 G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) {
57 if (UsePerfData) {
58 update_all();
59 }
60 }
61
62 virtual void update_all() {
63 size_t committed =
64 G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3);
65 _current_size->set_value(committed);
66 }
67 };
68
69 class G1OldGenerationCounters : public G1GenerationCounters {
70 public:
71 G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
72 : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
73 G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
74 G1MonitoringSupport::pad_capacity(max_size),
75 G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
76 if (UsePerfData) {
77 update_all();
78 }
79 }
80
81 virtual void update_all() {
82 size_t committed =
83 G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
84 _current_size->set_value(committed);
85 }
86 };
87
88 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
89 _g1h(g1h),
90 _incremental_memory_manager("G1 Young Generation", "end of minor GC"),
91 _full_gc_memory_manager("G1 Old Generation", "end of major GC"),
92 _eden_space_pool(NULL),
93 _survivor_space_pool(NULL),
94 _old_gen_pool(NULL),
95 _incremental_collection_counters(NULL),
96 _full_collection_counters(NULL),
97 _conc_collection_counters(NULL),
98 _young_gen_counters(NULL),
99 _old_gen_counters(NULL),
100 _old_space_counters(NULL),
101 _eden_space_counters(NULL),
102 _from_space_counters(NULL),
103 _to_space_counters(NULL),
104
105 _overall_committed(0),
106 _overall_used(0),
107 _young_gen_committed(0),
108 _old_gen_committed(0),
109
110 _eden_space_committed(0),
111 _eden_space_used(0),
112 _survivor_space_committed(0),
113 _survivor_space_used(0),
114 _old_gen_used(0) {
115
116 recalculate_sizes();
117
118 // Counters for garbage collections
119 //
120 // name "collector.0". In a generational collector this would be the
121 // young generation collection.
122 _incremental_collection_counters =
123 new CollectorCounters("G1 young collection pauses", 0);
124 // name "collector.1". In a generational collector this would be the
125 // old generation collection.
126 _full_collection_counters =
127 new CollectorCounters("G1 full collection pauses", 1);
128 // name "collector.2". In a generational collector this would be the
129 // STW phases in concurrent collection.
130 _conc_collection_counters =
131 new CollectorCounters("G1 concurrent cycle pauses", 2);
132
133 // "Generation" and "Space" counters.
134 //
135 // name "generation.1" This is logically the old generation in
136 // generational GC terms. The "1, 1" parameters are for
137 // the n-th generation (=1) with 1 space.
138 // Counters are created from minCapacity, maxCapacity, and capacity
139 _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity());
140
141 // name "generation.1.space.0"
142 // Counters are created from maxCapacity, capacity, initCapacity,
143 // and used.
144 _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(),
145 "space", 0 /* ordinal */,
146 pad_capacity(g1h->max_capacity()) /* max_capacity */,
147 pad_capacity(_old_gen_committed) /* init_capacity */);
148
149 // Young collection set
150 // name "generation.0". This is logically the young generation.
151 // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
152 // See _old_collection_counters for additional counters
153 _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity());
154
155 const char* young_collection_name_space = _young_gen_counters->name_space();
156
157 // name "generation.0.space.0"
158 // See _old_space_counters for additional counters
159 _eden_space_counters = new HSpaceCounters(young_collection_name_space,
160 "eden", 0 /* ordinal */,
161 pad_capacity(g1h->max_capacity()) /* max_capacity */,
162 pad_capacity(_eden_space_committed) /* init_capacity */);
163
164 // name "generation.0.space.1"
165 // See _old_space_counters for additional counters
166 // Set the arguments to indicate that this survivor space is not used.
167 _from_space_counters = new HSpaceCounters(young_collection_name_space,
168 "s0", 1 /* ordinal */,
169 pad_capacity(0) /* max_capacity */,
170 pad_capacity(0) /* init_capacity */);
171 // Given that this survivor space is not used, we update it here
172 // once to reflect that its used space is 0 so that we don't have to
173 // worry about updating it again later.
174 if (UsePerfData) {
175 _from_space_counters->update_used(0);
176 }
177
178 // name "generation.0.space.2"
179 // See _old_space_counters for additional counters
180 _to_space_counters = new HSpaceCounters(young_collection_name_space,
181 "s1", 2 /* ordinal */,
182 pad_capacity(g1h->max_capacity()) /* max_capacity */,
183 pad_capacity(_survivor_space_committed) /* init_capacity */);
184 }
185
186 G1MonitoringSupport::~G1MonitoringSupport() {
187 delete _eden_space_pool;
188 delete _survivor_space_pool;
189 delete _old_gen_pool;
190 }
191
192 void G1MonitoringSupport::initialize_serviceability() {
193 _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed);
194 _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed);
195 _old_gen_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity());
196
197 _full_gc_memory_manager.add_pool(_eden_space_pool);
198 _full_gc_memory_manager.add_pool(_survivor_space_pool);
199 _full_gc_memory_manager.add_pool(_old_gen_pool);
200
201 _incremental_memory_manager.add_pool(_eden_space_pool);
202 _incremental_memory_manager.add_pool(_survivor_space_pool);
203 _incremental_memory_manager.add_pool(_old_gen_pool, false /* always_affected_by_gc */);
204 }
205
206 MemoryUsage G1MonitoringSupport::memory_usage() {
207 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
208 return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity());
209 }
210
211 GrowableArray<GCMemoryManager*> G1MonitoringSupport::memory_managers() {
212 GrowableArray<GCMemoryManager*> memory_managers(2);
213 memory_managers.append(&_incremental_memory_manager);
214 memory_managers.append(&_full_gc_memory_manager);
215 return memory_managers;
216 }
217
218 GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() {
219 GrowableArray<MemoryPool*> memory_pools(3);
220 memory_pools.append(_eden_space_pool);
221 memory_pools.append(_survivor_space_pool);
222 memory_pools.append(_old_gen_pool);
223 return memory_pools;
224 }
225
226 void G1MonitoringSupport::recalculate_sizes() {
227 assert_heap_locked_or_at_safepoint(true);
228
229 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
230 // Recalculate all the sizes from scratch.
231
232 // This never includes used bytes of current allocating heap region.
233 _overall_used = _g1h->used_unlocked();
234 _eden_space_used = _g1h->eden_regions_used_bytes();
235 _survivor_space_used = _g1h->survivor_regions_used_bytes();
236
237 // _overall_used and _eden_space_used are obtained concurrently so
238 // may be inconsistent with each other. To prevent _old_gen_used going negative,
239 // use smaller value to substract.
240 _old_gen_used = _overall_used - MIN2(_overall_used, _eden_space_used + _survivor_space_used);
241
242 uint survivor_list_length = _g1h->survivor_regions_count();
243 // Max length includes any potential extensions to the young gen
244 // we'll do when the GC locker is active.
245 uint young_list_max_length = _g1h->policy()->young_list_max_length();
246 assert(young_list_max_length >= survivor_list_length, "invariant");
247 uint eden_list_max_length = young_list_max_length - survivor_list_length;
248
249 // First calculate the committed sizes that can be calculated independently.
250 _survivor_space_committed = survivor_list_length * HeapRegion::GrainBytes;
251 _old_gen_committed = HeapRegion::align_up_to_region_byte_size(_old_gen_used);
252
253 // Next, start with the overall committed size.
254 _overall_committed = _g1h->capacity();
255 size_t committed = _overall_committed;
256
257 // Remove the committed size we have calculated so far (for the
258 // survivor and old space).
259 assert(committed >= (_survivor_space_committed + _old_gen_committed), "sanity");
260 committed -= _survivor_space_committed + _old_gen_committed;
261
262 // Next, calculate and remove the committed size for the eden.
263 _eden_space_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
264 // Somewhat defensive: be robust in case there are inaccuracies in
265 // the calculations
266 _eden_space_committed = MIN2(_eden_space_committed, committed);
267 committed -= _eden_space_committed;
268
269 // Finally, give the rest to the old space...
270 _old_gen_committed += committed;
271 // ..and calculate the young gen committed.
272 _young_gen_committed = _eden_space_committed + _survivor_space_committed;
273
274 assert(_overall_committed ==
275 (_eden_space_committed + _survivor_space_committed + _old_gen_committed),
276 "the committed sizes should add up");
277 // Somewhat defensive: cap the eden used size to make sure it
278 // never exceeds the committed size.
279 _eden_space_used = MIN2(_eden_space_used, _eden_space_committed);
280 // _survivor_space_used is calculated during a safepoint and _survivor_space_committed
281 // is calculated from survivor region count * heap region size.
282 assert(_survivor_space_used <= _survivor_space_committed, "Survivor used bytes(" SIZE_FORMAT
283 ") should be less than or equal to survivor committed(" SIZE_FORMAT ")",
284 _survivor_space_used, _survivor_space_committed);
285 // _old_gen_committed is calculated in terms of _old_gen_used value.
286 assert(_old_gen_used <= _old_gen_committed, "Old gen used bytes(" SIZE_FORMAT
287 ") should be less than or equal to old gen committed(" SIZE_FORMAT ")",
288 _old_gen_used, _old_gen_committed);
289 }
290
291 void G1MonitoringSupport::update_sizes() {
292 recalculate_sizes();
293 if (UsePerfData) {
294 _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
295 _eden_space_counters->update_used(_eden_space_used);
296 // only the "to" survivor space is active, so we don't need to
297 // update the counters for the "from" survivor space
298 _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed));
299 _to_space_counters->update_used(_survivor_space_used);
300 _old_space_counters->update_capacity(pad_capacity(_old_gen_committed));
301 _old_space_counters->update_used(_old_gen_used);
302
303 _young_gen_counters->update_all();
304 _old_gen_counters->update_all();
305
306 MetaspaceCounters::update_performance_counters();
307 CompressedClassSpaceCounters::update_performance_counters();
308 }
309 }
310
311 void G1MonitoringSupport::update_eden_size() {
312 // Recalculate everything - this should be fast enough and we are sure that we do not
313 // miss anything.
314 recalculate_sizes();
315 if (UsePerfData) {
316 _eden_space_counters->update_used(_eden_space_used);
317 }
318 }
319
320 MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) {
321 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
322
323 return MemoryUsage(initial_size,
324 _eden_space_used,
325 _eden_space_committed,
326 max_size);
327 }
328
329 MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) {
330 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
331
332 return MemoryUsage(initial_size,
333 _survivor_space_used,
334 _survivor_space_committed,
335 max_size);
336 }
337
338 MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) {
339 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
340
341 return MemoryUsage(initial_size,
342 _old_gen_used,
343 _old_gen_committed,
344 max_size);
345 }
346
347 G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool all_memory_pools_affected) :
348 _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters),
349 _tms(full_gc ? &g1mm->_full_gc_memory_manager : &g1mm->_incremental_memory_manager,
350 G1CollectedHeap::heap()->gc_cause(), all_memory_pools_affected) {
351 }