1/*
2 * Copyright (c) 2003, 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 "classfile/systemDictionary.hpp"
27#include "classfile/vmSymbols.hpp"
28#include "memory/metaspace.hpp"
29#include "oops/oop.inline.hpp"
30#include "runtime/handles.inline.hpp"
31#include "runtime/javaCalls.hpp"
32#include "runtime/orderAccess.hpp"
33#include "services/lowMemoryDetector.hpp"
34#include "services/management.hpp"
35#include "services/memoryManager.hpp"
36#include "services/memoryPool.hpp"
37#include "utilities/globalDefinitions.hpp"
38#include "utilities/macros.hpp"
39
40MemoryPool::MemoryPool(const char* name,
41 PoolType type,
42 size_t init_size,
43 size_t max_size,
44 bool support_usage_threshold,
45 bool support_gc_threshold) {
46 _name = name;
47 _initial_size = init_size;
48 _max_size = max_size;
49 (void)const_cast<instanceOop&>(_memory_pool_obj = instanceOop(NULL));
50 _available_for_allocation = true;
51 _num_managers = 0;
52 _type = type;
53
54 // initialize the max and init size of collection usage
55 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);
56
57 _usage_sensor = NULL;
58 _gc_usage_sensor = NULL;
59 // usage threshold supports both high and low threshold
60 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
61 // gc usage threshold supports only high threshold
62 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
63}
64
65void MemoryPool::add_manager(MemoryManager* mgr) {
66 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
67 if (_num_managers < MemoryPool::max_num_managers) {
68 _managers[_num_managers] = mgr;
69 _num_managers++;
70 }
71}
72
73
74// Returns an instanceHandle of a MemoryPool object.
75// It creates a MemoryPool instance when the first time
76// this function is called.
77instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
78 // Must do an acquire so as to force ordering of subsequent
79 // loads from anything _memory_pool_obj points to or implies.
80 instanceOop pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
81 if (pool_obj == NULL) {
82 // It's ok for more than one thread to execute the code up to the locked region.
83 // Extra pool instances will just be gc'ed.
84 InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL);
85
86 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
87 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
88 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
89
90 JavaValue result(T_OBJECT);
91 JavaCallArguments args;
92 args.push_oop(pool_name); // Argument 1
93 args.push_int((int) is_heap()); // Argument 2
94
95 Symbol* method_name = vmSymbols::createMemoryPool_name();
96 Symbol* signature = vmSymbols::createMemoryPool_signature();
97
98 args.push_long(usage_threshold_value); // Argument 3
99 args.push_long(gc_usage_threshold_value); // Argument 4
100
101 JavaCalls::call_static(&result,
102 ik,
103 method_name,
104 signature,
105 &args,
106 CHECK_NULL);
107
108 instanceOop p = (instanceOop) result.get_jobject();
109 instanceHandle pool(THREAD, p);
110
111 {
112 // Get lock since another thread may have create the instance
113 MutexLocker ml(Management_lock);
114
115 // Check if another thread has created the pool. We reload
116 // _memory_pool_obj here because some other thread may have
117 // initialized it while we were executing the code before the lock.
118 //
119 // The lock has done an acquire, so the load can't float above it,
120 // but we need to do a load_acquire as above.
121 pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
122 if (pool_obj != NULL) {
123 return pool_obj;
124 }
125
126 // Get the address of the object we created via call_special.
127 pool_obj = pool();
128
129 // Use store barrier to make sure the memory accesses associated
130 // with creating the pool are visible before publishing its address.
131 // The unlock will publish the store to _memory_pool_obj because
132 // it does a release first.
133 OrderAccess::release_store(&_memory_pool_obj, pool_obj);
134 }
135 }
136
137 return pool_obj;
138}
139
140inline static size_t get_max_value(size_t val1, size_t val2) {
141 return (val1 > val2 ? val1 : val2);
142}
143
144void MemoryPool::record_peak_memory_usage() {
145 // Caller in JDK is responsible for synchronization -
146 // acquire the lock for this memory pool before calling VM
147 MemoryUsage usage = get_memory_usage();
148 size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
149 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
150 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
151
152 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
153}
154
155static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {
156 assert(*sensor_ptr == NULL, "Should be called only once");
157 SensorInfo* sensor = new SensorInfo();
158 sensor->set_sensor(sh());
159 *sensor_ptr = sensor;
160}
161
162void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {
163 set_sensor_obj_at(&_usage_sensor, sh);
164}
165
166void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {
167 set_sensor_obj_at(&_gc_usage_sensor, sh);
168}
169
170void MemoryPool::oops_do(OopClosure* f) {
171 f->do_oop((oop*) &_memory_pool_obj);
172 if (_usage_sensor != NULL) {
173 _usage_sensor->oops_do(f);
174 }
175 if (_gc_usage_sensor != NULL) {
176 _gc_usage_sensor->oops_do(f);
177 }
178}
179
180CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :
181 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),
182 support_usage_threshold, false), _codeHeap(codeHeap) {
183}
184
185MemoryUsage CodeHeapPool::get_memory_usage() {
186 size_t used = used_in_bytes();
187 size_t committed = _codeHeap->capacity();
188 size_t maxSize = (available_for_allocation() ? max_size() : 0);
189
190 return MemoryUsage(initial_size(), used, committed, maxSize);
191}
192
193MetaspacePool::MetaspacePool() :
194 MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { }
195
196MemoryUsage MetaspacePool::get_memory_usage() {
197 size_t committed = MetaspaceUtils::committed_bytes();
198 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());
199}
200
201size_t MetaspacePool::used_in_bytes() {
202 return MetaspaceUtils::used_bytes();
203}
204
205size_t MetaspacePool::calculate_max_size() const {
206 return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize :
207 MemoryUsage::undefined_size();
208}
209
210CompressedKlassSpacePool::CompressedKlassSpacePool() :
211 MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { }
212
213size_t CompressedKlassSpacePool::used_in_bytes() {
214 return MetaspaceUtils::used_bytes(Metaspace::ClassType);
215}
216
217MemoryUsage CompressedKlassSpacePool::get_memory_usage() {
218 size_t committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
219 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());
220}
221