1 /*
2 * Copyright (c) 2013, 2017, 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 #ifndef SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP
26 #define SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP
27
28 #if INCLUDE_NMT
29
30 #include "memory/allocation.hpp"
31 #include "memory/metaspace.hpp"
32 #include "services/allocationSite.hpp"
33 #include "services/nmtCommon.hpp"
34 #include "utilities/linkedlist.hpp"
35 #include "utilities/nativeCallStack.hpp"
36 #include "utilities/ostream.hpp"
37
38
39 /*
40 * Virtual memory counter
41 */
42 class VirtualMemory VALUE_OBJ_CLASS_SPEC {
43 private:
44 size_t _reserved;
45 size_t _committed;
46
47 public:
48 VirtualMemory() : _reserved(0), _committed(0) { }
49
50 inline void reserve_memory(size_t sz) { _reserved += sz; }
51 inline void commit_memory (size_t sz) {
52 _committed += sz;
53 assert(_committed <= _reserved, "Sanity check");
54 }
55
56 inline void release_memory (size_t sz) {
57 assert(_reserved >= sz, "Negative amount");
58 _reserved -= sz;
59 }
60
61 inline void uncommit_memory(size_t sz) {
62 assert(_committed >= sz, "Negative amount");
63 _committed -= sz;
64 }
65
66 inline size_t reserved() const { return _reserved; }
67 inline size_t committed() const { return _committed; }
68 };
69
70 // Virtual memory allocation site, keeps track where the virtual memory is reserved.
71 class VirtualMemoryAllocationSite : public AllocationSite<VirtualMemory> {
72 public:
73 VirtualMemoryAllocationSite(const NativeCallStack& stack) :
74 AllocationSite<VirtualMemory>(stack) { }
75
76 inline void reserve_memory(size_t sz) { data()->reserve_memory(sz); }
77 inline void commit_memory (size_t sz) { data()->commit_memory(sz); }
78 inline void uncommit_memory(size_t sz) { data()->uncommit_memory(sz); }
79 inline void release_memory(size_t sz) { data()->release_memory(sz); }
80 inline size_t reserved() const { return peek()->reserved(); }
81 inline size_t committed() const { return peek()->committed(); }
82 };
83
84 class VirtualMemorySummary;
85
86 // This class represents a snapshot of virtual memory at a given time.
87 // The latest snapshot is saved in a static area.
88 class VirtualMemorySnapshot : public ResourceObj {
89 friend class VirtualMemorySummary;
90
91 private:
92 VirtualMemory _virtual_memory[mt_number_of_types];
93
94 public:
95 inline VirtualMemory* by_type(MEMFLAGS flag) {
96 int index = NMTUtil::flag_to_index(flag);
97 return &_virtual_memory[index];
98 }
99
100 inline VirtualMemory* by_index(int index) {
101 assert(index >= 0, "Index out of bound");
102 assert(index < mt_number_of_types, "Index out of bound");
103 return &_virtual_memory[index];
104 }
105
106 inline size_t total_reserved() const {
107 size_t amount = 0;
108 for (int index = 0; index < mt_number_of_types; index ++) {
109 amount += _virtual_memory[index].reserved();
110 }
111 return amount;
112 }
113
114 inline size_t total_committed() const {
115 size_t amount = 0;
116 for (int index = 0; index < mt_number_of_types; index ++) {
117 amount += _virtual_memory[index].committed();
118 }
119 return amount;
120 }
121
122 void copy_to(VirtualMemorySnapshot* s) {
123 for (int index = 0; index < mt_number_of_types; index ++) {
124 s->_virtual_memory[index] = _virtual_memory[index];
125 }
126 }
127 };
128
129 class VirtualMemorySummary : AllStatic {
130 public:
131 static void initialize();
132
133 static inline void record_reserved_memory(size_t size, MEMFLAGS flag) {
134 as_snapshot()->by_type(flag)->reserve_memory(size);
135 }
136
137 static inline void record_committed_memory(size_t size, MEMFLAGS flag) {
138 as_snapshot()->by_type(flag)->commit_memory(size);
139 }
140
141 static inline void record_uncommitted_memory(size_t size, MEMFLAGS flag) {
142 as_snapshot()->by_type(flag)->uncommit_memory(size);
143 }
144
145 static inline void record_released_memory(size_t size, MEMFLAGS flag) {
146 as_snapshot()->by_type(flag)->release_memory(size);
147 }
148
149 // Move virtual memory from one memory type to another.
150 // Virtual memory can be reserved before it is associated with a memory type, and tagged
151 // as 'unknown'. Once the memory is tagged, the virtual memory will be moved from 'unknown'
152 // type to specified memory type.
153 static inline void move_reserved_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
154 as_snapshot()->by_type(from)->release_memory(size);
155 as_snapshot()->by_type(to)->reserve_memory(size);
156 }
157
158 static inline void move_committed_memory(MEMFLAGS from, MEMFLAGS to, size_t size) {
159 as_snapshot()->by_type(from)->uncommit_memory(size);
160 as_snapshot()->by_type(to)->commit_memory(size);
161 }
162
163 static inline void snapshot(VirtualMemorySnapshot* s) {
164 as_snapshot()->copy_to(s);
165 }
166
167 static VirtualMemorySnapshot* as_snapshot() {
168 return (VirtualMemorySnapshot*)_snapshot;
169 }
170
171 private:
172 static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)];
173 };
174
175
176
177 /*
178 * A virtual memory region
179 */
180 class VirtualMemoryRegion VALUE_OBJ_CLASS_SPEC {
181 private:
182 address _base_address;
183 size_t _size;
184
185 public:
186 VirtualMemoryRegion(address addr, size_t size) :
187 _base_address(addr), _size(size) {
188 assert(addr != NULL, "Invalid address");
189 assert(size > 0, "Invalid size");
190 }
191
192 inline address base() const { return _base_address; }
193 inline address end() const { return base() + size(); }
194 inline size_t size() const { return _size; }
195
196 inline bool is_empty() const { return size() == 0; }
197
198 inline bool contain_address(address addr) const {
199 return (addr >= base() && addr < end());
200 }
201
202
203 inline bool contain_region(address addr, size_t size) const {
204 return contain_address(addr) && contain_address(addr + size - 1);
205 }
206
207 inline bool same_region(address addr, size_t sz) const {
208 return (addr == base() && sz == size());
209 }
210
211
212 inline bool overlap_region(address addr, size_t sz) const {
213 VirtualMemoryRegion rgn(addr, sz);
214 return contain_address(addr) ||
215 contain_address(addr + sz - 1) ||
216 rgn.contain_address(base()) ||
217 rgn.contain_address(end() - 1);
218 }
219
220 inline bool adjacent_to(address addr, size_t sz) const {
221 return (addr == end() || (addr + sz) == base());
222 }
223
224 void exclude_region(address addr, size_t sz) {
225 assert(contain_region(addr, sz), "Not containment");
226 assert(addr == base() || addr + sz == end(), "Can not exclude from middle");
227 size_t new_size = size() - sz;
228
229 if (addr == base()) {
230 set_base(addr + sz);
231 }
232 set_size(new_size);
233 }
234
235 void expand_region(address addr, size_t sz) {
236 assert(adjacent_to(addr, sz), "Not adjacent regions");
237 if (base() == addr + sz) {
238 set_base(addr);
239 }
240 set_size(size() + sz);
241 }
242
243 protected:
244 void set_base(address base) {
245 assert(base != NULL, "Sanity check");
246 _base_address = base;
247 }
248
249 void set_size(size_t size) {
250 assert(size > 0, "Sanity check");
251 _size = size;
252 }
253 };
254
255
256 class CommittedMemoryRegion : public VirtualMemoryRegion {
257 private:
258 NativeCallStack _stack;
259
260 public:
261 CommittedMemoryRegion(address addr, size_t size, const NativeCallStack& stack) :
262 VirtualMemoryRegion(addr, size), _stack(stack) { }
263
264 inline int compare(const CommittedMemoryRegion& rgn) const {
265 if (overlap_region(rgn.base(), rgn.size())) {
266 return 0;
267 } else {
268 if (base() == rgn.base()) {
269 return 0;
270 } else if (base() > rgn.base()) {
271 return 1;
272 } else {
273 return -1;
274 }
275 }
276 }
277
278 inline bool equals(const CommittedMemoryRegion& rgn) const {
279 return compare(rgn) == 0;
280 }
281
282 inline void set_call_stack(const NativeCallStack& stack) { _stack = stack; }
283 inline const NativeCallStack* call_stack() const { return &_stack; }
284 };
285
286
287 typedef LinkedListIterator<CommittedMemoryRegion> CommittedRegionIterator;
288
289 int compare_committed_region(const CommittedMemoryRegion&, const CommittedMemoryRegion&);
290 class ReservedMemoryRegion : public VirtualMemoryRegion {
291 private:
292 SortedLinkedList<CommittedMemoryRegion, compare_committed_region>
293 _committed_regions;
294
295 NativeCallStack _stack;
296 MEMFLAGS _flag;
297
298 bool _all_committed;
299
300 public:
301 ReservedMemoryRegion(address base, size_t size, const NativeCallStack& stack,
302 MEMFLAGS flag = mtNone) :
303 VirtualMemoryRegion(base, size), _stack(stack), _flag(flag),
304 _all_committed(false) { }
305
306
307 ReservedMemoryRegion(address base, size_t size) :
308 VirtualMemoryRegion(base, size), _stack(NativeCallStack::EMPTY_STACK), _flag(mtNone),
309 _all_committed(false) { }
310
311 // Copy constructor
312 ReservedMemoryRegion(const ReservedMemoryRegion& rr) :
313 VirtualMemoryRegion(rr.base(), rr.size()) {
314 *this = rr;
315 }
316
317 inline void set_call_stack(const NativeCallStack& stack) { _stack = stack; }
318 inline const NativeCallStack* call_stack() const { return &_stack; }
319
320 void set_flag(MEMFLAGS flag);
321 inline MEMFLAGS flag() const { return _flag; }
322
323 inline int compare(const ReservedMemoryRegion& rgn) const {
324 if (overlap_region(rgn.base(), rgn.size())) {
325 return 0;
326 } else {
327 if (base() == rgn.base()) {
328 return 0;
329 } else if (base() > rgn.base()) {
330 return 1;
331 } else {
332 return -1;
333 }
334 }
335 }
336
337 inline bool equals(const ReservedMemoryRegion& rgn) const {
338 return compare(rgn) == 0;
339 }
340
341 bool add_committed_region(address addr, size_t size, const NativeCallStack& stack);
342 bool remove_uncommitted_region(address addr, size_t size);
343
344 size_t committed_size() const;
345
346 // move committed regions that higher than specified address to
347 // the new region
348 void move_committed_regions(address addr, ReservedMemoryRegion& rgn);
349
350 inline bool all_committed() const { return _all_committed; }
351 void set_all_committed(bool b);
352
353 CommittedRegionIterator iterate_committed_regions() const {
354 return CommittedRegionIterator(_committed_regions.head());
355 }
356
357 ReservedMemoryRegion& operator= (const ReservedMemoryRegion& other) {
358 set_base(other.base());
359 set_size(other.size());
360
361 _stack = *other.call_stack();
362 _flag = other.flag();
363 _all_committed = other.all_committed();
364 if (other.all_committed()) {
365 set_all_committed(true);
366 } else {
367 CommittedRegionIterator itr = other.iterate_committed_regions();
368 const CommittedMemoryRegion* rgn = itr.next();
369 while (rgn != NULL) {
370 _committed_regions.add(*rgn);
371 rgn = itr.next();
372 }
373 }
374 return *this;
375 }
376
377 private:
378 // The committed region contains the uncommitted region, subtract the uncommitted
379 // region from this committed region
380 bool remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node,
381 address addr, size_t sz);
382
383 bool add_committed_region(const CommittedMemoryRegion& rgn) {
384 assert(rgn.base() != NULL, "Invalid base address");
385 assert(size() > 0, "Invalid size");
386 return _committed_regions.add(rgn) != NULL;
387 }
388 };
389
390 int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2);
391
392 class VirtualMemoryWalker : public StackObj {
393 public:
394 virtual bool do_allocation_site(const ReservedMemoryRegion* rgn) { return false; }
395 };
396
397 // Main class called from MemTracker to track virtual memory allocations, commits and releases.
398 class VirtualMemoryTracker : AllStatic {
399 public:
400 static bool initialize(NMT_TrackingLevel level);
401
402 // Late phase initialization
403 static bool late_initialize(NMT_TrackingLevel level);
404
405 static bool add_reserved_region (address base_addr, size_t size, const NativeCallStack& stack,
406 MEMFLAGS flag = mtNone, bool all_committed = false);
407
408 static bool add_committed_region (address base_addr, size_t size, const NativeCallStack& stack);
409 static bool remove_uncommitted_region (address base_addr, size_t size);
410 static bool remove_released_region (address base_addr, size_t size);
411 static void set_reserved_region_type (address addr, MEMFLAGS flag);
412
413 // Walk virtual memory data structure for creating baseline, etc.
414 static bool walk_virtual_memory(VirtualMemoryWalker* walker);
415
416 static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to);
417
418 private:
419 static SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* _reserved_regions;
420 };
421
422
423 class MetaspaceSnapshot : public ResourceObj {
424 private:
425 size_t _reserved_in_bytes[Metaspace::MetadataTypeCount];
426 size_t _committed_in_bytes[Metaspace::MetadataTypeCount];
427 size_t _used_in_bytes[Metaspace::MetadataTypeCount];
428 size_t _free_in_bytes[Metaspace::MetadataTypeCount];
429
430 public:
431 MetaspaceSnapshot();
432 size_t reserved_in_bytes(Metaspace::MetadataType type) const { assert_valid_metadata_type(type); return _reserved_in_bytes[type]; }
433 size_t committed_in_bytes(Metaspace::MetadataType type) const { assert_valid_metadata_type(type); return _committed_in_bytes[type]; }
434 size_t used_in_bytes(Metaspace::MetadataType type) const { assert_valid_metadata_type(type); return _used_in_bytes[type]; }
435 size_t free_in_bytes(Metaspace::MetadataType type) const { assert_valid_metadata_type(type); return _free_in_bytes[type]; }
436
437 static void snapshot(MetaspaceSnapshot& s);
438
439 private:
440 static void snapshot(Metaspace::MetadataType type, MetaspaceSnapshot& s);
441
442 static void assert_valid_metadata_type(Metaspace::MetadataType type) {
443 assert(type == Metaspace::ClassType || type == Metaspace::NonClassType,
444 "Invalid metadata type");
445 }
446 };
447
448 #endif // INCLUDE_NMT
449
450 #endif // SHARE_VM_SERVICES_VIRTUAL_MEMORY_TRACKER_HPP