1 /*
2 * Copyright (c) 2011, 2018, 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/collectorCounters.hpp"
31 #include "gc/shared/hSpaceCounters.hpp"
32 #include "memory/metaspaceCounters.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 _update_mutex(Mutex::leaf, "G1 Monitoring Support Lock", true, Monitor::_safepoint_check_never),
91 _incremental_memory_manager("G1 Young Generation", "end of minor GC"),
92 _full_gc_memory_manager("G1 Old Generation", "end of major GC"),
93 _eden_pool(NULL),
94 _survivor_pool(NULL),
95 _old_pool(NULL),
96 _incremental_collection_counters(NULL),
97 _full_collection_counters(NULL),
98 _conc_collection_counters(NULL),
99 _young_gen_counters(NULL),
100 _old_gen_counters(NULL),
101 _old_space_counters(NULL),
102 _eden_space_counters(NULL),
103 _from_space_counters(NULL),
104 _to_space_counters(NULL),
105
106 _overall_committed(0),
107 _overall_used(0),
108 _young_gen_committed(0),
109 _old_gen_committed(0),
110
111 _eden_space_committed(0),
112 _eden_space_used(0),
113 _survivor_space_committed(0),
114 _survivor_space_used(0),
115 _old_gen_used(0) {
116
117 recalculate_sizes();
118
119 // Counters for garbage collections
120 //
121 // name "collector.0". In a generational collector this would be the
122 // young generation collection.
123 _incremental_collection_counters =
124 new CollectorCounters("G1 incremental collections", 0);
125 // name "collector.1". In a generational collector this would be the
126 // old generation collection.
127 _full_collection_counters =
128 new CollectorCounters("G1 stop-the-world full collections", 1);
129 // name "collector.2". In a generational collector this would be the
130 // STW phases in concurrent collection.
131 _conc_collection_counters =
132 new CollectorCounters("G1 stop-the-world phases", 2);
133
134 // "Generation" and "Space" counters.
135 //
136 // name "generation.1" This is logically the old generation in
137 // generational GC terms. The "1, 1" parameters are for
138 // the n-th generation (=1) with 1 space.
139 // Counters are created from minCapacity, maxCapacity, and capacity
140 _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity());
141
142 // name "generation.1.space.0"
143 // Counters are created from maxCapacity, capacity, initCapacity,
144 // and used.
145 _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(),
146 "space", 0 /* ordinal */,
147 pad_capacity(g1h->max_capacity()) /* max_capacity */,
148 pad_capacity(_old_gen_committed) /* init_capacity */);
149
150 // Young collection set
151 // name "generation.0". This is logically the young generation.
152 // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
153 // See _old_collection_counters for additional counters
154 _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity());
155
156 const char* young_collection_name_space = _young_gen_counters->name_space();
157
158 // name "generation.0.space.0"
159 // See _old_space_counters for additional counters
160 _eden_space_counters = new HSpaceCounters(young_collection_name_space,
161 "eden", 0 /* ordinal */,
162 pad_capacity(g1h->max_capacity()) /* max_capacity */,
163 pad_capacity(_eden_space_committed) /* init_capacity */);
164
165 // name "generation.0.space.1"
166 // See _old_space_counters for additional counters
167 // Set the arguments to indicate that this survivor space is not used.
168 _from_space_counters = new HSpaceCounters(young_collection_name_space,
169 "s0", 1 /* ordinal */,
170 pad_capacity(0) /* max_capacity */,
171 pad_capacity(0) /* init_capacity */);
172 // Given that this survivor space is not used, we update it here
173 // once to reflect that its used space is 0 so that we don't have to
174 // worry about updating it again later.
175 _from_space_counters->update_used(0);
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
185 G1MonitoringSupport::~G1MonitoringSupport() {
186 delete _eden_pool;
187 delete _survivor_pool;
188 delete _old_pool;
189 }
190
191 void G1MonitoringSupport::initialize_serviceability() {
192 _eden_pool = new G1EdenPool(_g1h, _eden_space_committed);
193 _survivor_pool = new G1SurvivorPool(_g1h, _survivor_space_committed);
194 _old_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity());
195
196 _full_gc_memory_manager.add_pool(_eden_pool);
197 _full_gc_memory_manager.add_pool(_survivor_pool);
198 _full_gc_memory_manager.add_pool(_old_pool);
199
200 _incremental_memory_manager.add_pool(_eden_pool);
201 _incremental_memory_manager.add_pool(_survivor_pool);
202 _incremental_memory_manager.add_pool(_old_pool, false /* always_affected_by_gc */);
203 }
204
205 MemoryUsage G1MonitoringSupport::memory_usage() {
206 MutexLockerEx x(&_update_mutex, Mutex::_no_safepoint_check_flag);
207 return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity());
208 }
209
210 GrowableArray<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
217 GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() {
218 GrowableArray<MemoryPool*> memory_pools(3);
219 memory_pools.append(_eden_pool);
220 memory_pools.append(_survivor_pool);
221 memory_pools.append(_old_pool);
222 return memory_pools;
223 }
224
225 void G1MonitoringSupport::recalculate_sizes() {
226 assert_heap_locked_or_at_safepoint(true);
227
228 MutexLockerEx x(&_update_mutex, Mutex::_no_safepoint_check_flag);
229 // Recalculate all the sizes from scratch.
230
231 uint young_list_length = _g1h->young_regions_count();
232 uint survivor_list_length = _g1h->survivor_regions_count();
233 assert(young_list_length >= survivor_list_length, "invariant");
234 uint eden_list_length = young_list_length - survivor_list_length;
235 // Max length includes any potential extensions to the young gen
236 // we'll do when the GC locker is active.
237 uint young_list_max_length = _g1h->g1_policy()->young_list_max_length();
238 assert(young_list_max_length >= survivor_list_length, "invariant");
239 uint eden_list_max_length = young_list_max_length - survivor_list_length;
240
241 _overall_used = _g1h->used_unlocked();
242 _eden_space_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
243 _survivor_space_used = (size_t) survivor_list_length * HeapRegion::GrainBytes;
244 _old_gen_used = subtract_up_to_zero(_overall_used, _eden_space_used + _survivor_space_used);
245
246 // First calculate the committed sizes that can be calculated independently.
247 _survivor_space_committed = _survivor_space_used;
248 _old_gen_committed = HeapRegion::align_up_to_region_byte_size(_old_gen_used);
249
250 // Next, start with the overall committed size.
251 _overall_committed = _g1h->capacity();
252 size_t committed = _overall_committed;
253
254 // Remove the committed size we have calculated so far (for the
255 // survivor and old space).
256 assert(committed >= (_survivor_space_committed + _old_gen_committed), "sanity");
257 committed -= _survivor_space_committed + _old_gen_committed;
258
259 // Next, calculate and remove the committed size for the eden.
260 _eden_space_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
261 // Somewhat defensive: be robust in case there are inaccuracies in
262 // the calculations
263 _eden_space_committed = MIN2(_eden_space_committed, committed);
264 committed -= _eden_space_committed;
265
266 // Finally, give the rest to the old space...
267 _old_gen_committed += committed;
268 // ..and calculate the young gen committed.
269 _young_gen_committed = _eden_space_committed + _survivor_space_committed;
270
271 assert(_overall_committed ==
272 (_eden_space_committed + _survivor_space_committed + _old_gen_committed),
273 "the committed sizes should add up");
274 // Somewhat defensive: cap the eden used size to make sure it
275 // never exceeds the committed size.
276 _eden_space_used = MIN2(_eden_space_used, _eden_space_committed);
277 // _survivor_committed and _old_committed are calculated in terms of
278 // the corresponding _*_used value, so the next two conditions
279 // should hold.
280 assert(_survivor_space_used <= _survivor_space_committed, "post-condition");
281 assert(_old_gen_used <= _old_gen_committed, "post-condition");
282 }
283
284 void G1MonitoringSupport::update_sizes() {
285 recalculate_sizes();
286 if (UsePerfData) {
287 _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
288 _eden_space_counters->update_used(_eden_space_used);
289 // only the "to" survivor space is active, so we don't need to
290 // update the counters for the "from" survivor space
291 _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed));
292 _to_space_counters->update_used(_survivor_space_used);
293 _old_space_counters->update_capacity(pad_capacity(_old_gen_committed));
294 _old_space_counters->update_used(_old_gen_used);
295
296 _young_gen_counters->update_all();
297 _old_gen_counters->update_all();
298
299 MetaspaceCounters::update_performance_counters();
300 CompressedClassSpaceCounters::update_performance_counters();
301 }
302 }
303
304 void G1MonitoringSupport::update_eden_size() {
305 // Recalculate everything - this should be fast enough and we are sure that we do not
306 // miss anything.
307 recalculate_sizes();
308 if (UsePerfData) {
309 _eden_space_counters->update_used(_eden_space_used);
310 }
311 }
312
313 MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) {
314 MutexLockerEx x(&_update_mutex, Mutex::_no_safepoint_check_flag);
315
316 return MemoryUsage(initial_size,
317 _eden_space_used,
318 _eden_space_committed,
319 max_size);
320 }
321
322 MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) {
323 MutexLockerEx x(&_update_mutex, Mutex::_no_safepoint_check_flag);
324
325 return MemoryUsage(initial_size,
326 _survivor_space_used,
327 _survivor_space_committed,
328 max_size);
329 }
330
331 MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) {
332 MutexLockerEx x(&_update_mutex, Mutex::_no_safepoint_check_flag);
333
334 return MemoryUsage(initial_size,
335 _old_gen_used,
336 _old_gen_committed,
337 max_size);
338 }
339
340 G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool all_memory_pools_affected) :
341 _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters),
342 _tms(full_gc ? &g1mm->_full_gc_memory_manager : &g1mm->_incremental_memory_manager,
343 G1CollectedHeap::heap()->gc_cause(), all_memory_pools_affected) {
344 }