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comparison src/share/vm/services/memPtr.hpp @ 6197:d2a62e0f25eb

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6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
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6174:74533f63b116 6197:d2a62e0f25eb
1 /*
2 * Copyright (c) 2012, 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_MEM_PTR_HPP
26 #define SHARE_VM_SERVICES_MEM_PTR_HPP
27
28 #include "memory/allocation.hpp"
29 #include "runtime/atomic.hpp"
30 #include "runtime/os.hpp"
31 #include "runtime/safepoint.hpp"
32
33 /*
34 * global sequence generator that generates sequence numbers to serialize
35 * memory records.
36 */
37 class SequenceGenerator : AllStatic {
38 public:
39 static jint next();
40
41 // peek last sequence number
42 static jint peek() {
43 return _seq_number;
44 }
45
46 // reset sequence number
47 static void reset() {
48 assert(SafepointSynchronize::is_at_safepoint(), "Safepoint required");
49 _seq_number = 1;
50 DEBUG_ONLY(_generation ++;)
51 };
52
53 DEBUG_ONLY(static unsigned long current_generation() { return (unsigned long)_generation; })
54 DEBUG_ONLY(static jint max_seq_num() { return _max_seq_number; })
55
56 private:
57 static volatile jint _seq_number;
58 DEBUG_ONLY(static jint _max_seq_number; )
59 DEBUG_ONLY(static volatile unsigned long _generation; )
60 };
61
62 /*
63 * followings are the classes that are used to hold memory activity records in different stages.
64 * MemPointer
65 * |--------MemPointerRecord
66 * |
67 * |----MemPointerRecordEx
68 * | |
69 * | |-------SeqMemPointerRecordEx
70 * |
71 * |----SeqMemPointerRecord
72 * |
73 * |----VMMemRegion
74 * |
75 * |-----VMMemRegionEx
76 *
77 *
78 * prefix 'Seq' - sequenced, the record contains a sequence number
79 * surfix 'Ex' - extension, the record contains a caller's pc
80 *
81 * per-thread recorder : SeqMemPointerRecord(Ex)
82 * snapshot staging : SeqMemPointerRecord(Ex)
83 * snapshot : MemPointerRecord(Ex) and VMMemRegion(Ex)
84 *
85 */
86
87 /*
88 * class that wraps an address to a memory block,
89 * the memory pointer either points to a malloc'd
90 * memory block, or a mmap'd memory block
91 */
92 class MemPointer : public _ValueObj {
93 public:
94 MemPointer(): _addr(0) { }
95 MemPointer(address addr): _addr(addr) { }
96
97 MemPointer(const MemPointer& copy_from) {
98 _addr = copy_from.addr();
99 }
100
101 inline address addr() const {
102 return _addr;
103 }
104
105 inline operator address() const {
106 return addr();
107 }
108
109 inline bool operator == (const MemPointer& other) const {
110 return addr() == other.addr();
111 }
112
113 inline MemPointer& operator = (const MemPointer& other) {
114 _addr = other.addr();
115 return *this;
116 }
117
118 protected:
119 inline void set_addr(address addr) { _addr = addr; }
120
121 protected:
122 // memory address
123 address _addr;
124 };
125
126 /* MemPointerRecord records an activityand associated
127 * attributes on a memory block.
128 */
129 class MemPointerRecord : public MemPointer {
130 private:
131 MEMFLAGS _flags;
132 size_t _size;
133
134 public:
135 /* extension of MemoryType enum
136 * see share/vm/memory/allocation.hpp for details.
137 *
138 * The tag values are associated to sorting orders, so be
139 * careful if changes are needed.
140 * The allocation records should be sorted ahead of tagging
141 * records, which in turn ahead of deallocation records
142 */
143 enum MemPointerTags {
144 tag_alloc = 0x0001, // malloc or reserve record
145 tag_commit = 0x0002, // commit record
146 tag_type = 0x0003, // tag virtual memory to a memory type
147 tag_uncommit = 0x0004, // uncommit record
148 tag_release = 0x0005, // free or release record
149 tag_size = 0x0006, // arena size
150 tag_masks = 0x0007, // all tag bits
151 vmBit = 0x0008
152 };
153
154 /* helper functions to interpret the tagging flags */
155
156 inline static bool is_allocation_record(MEMFLAGS flags) {
157 return (flags & tag_masks) == tag_alloc;
158 }
159
160 inline static bool is_deallocation_record(MEMFLAGS flags) {
161 return (flags & tag_masks) == tag_release;
162 }
163
164 inline static bool is_arena_record(MEMFLAGS flags) {
165 return (flags & (otArena | tag_size)) == otArena;
166 }
167
168 inline static bool is_arena_size_record(MEMFLAGS flags) {
169 return (flags & (otArena | tag_size)) == (otArena | tag_size);
170 }
171
172 inline static bool is_virtual_memory_record(MEMFLAGS flags) {
173 return (flags & vmBit) != 0;
174 }
175
176 inline static bool is_virtual_memory_reserve_record(MEMFLAGS flags) {
177 return (flags & 0x0F) == (tag_alloc | vmBit);
178 }
179
180 inline static bool is_virtual_memory_commit_record(MEMFLAGS flags) {
181 return (flags & 0x0F) == (tag_commit | vmBit);
182 }
183
184 inline static bool is_virtual_memory_uncommit_record(MEMFLAGS flags) {
185 return (flags & 0x0F) == (tag_uncommit | vmBit);
186 }
187
188 inline static bool is_virtual_memory_release_record(MEMFLAGS flags) {
189 return (flags & 0x0F) == (tag_release | vmBit);
190 }
191
192 inline static bool is_virtual_memory_type_record(MEMFLAGS flags) {
193 return (flags & 0x0F) == (tag_type | vmBit);
194 }
195
196 /* tagging flags */
197 inline static MEMFLAGS malloc_tag() { return tag_alloc; }
198 inline static MEMFLAGS free_tag() { return tag_release; }
199 inline static MEMFLAGS arena_size_tag() { return tag_size | otArena; }
200 inline static MEMFLAGS virtual_memory_tag() { return vmBit; }
201 inline static MEMFLAGS virtual_memory_reserve_tag() { return (tag_alloc | vmBit); }
202 inline static MEMFLAGS virtual_memory_commit_tag() { return (tag_commit | vmBit); }
203 inline static MEMFLAGS virtual_memory_uncommit_tag(){ return (tag_uncommit | vmBit); }
204 inline static MEMFLAGS virtual_memory_release_tag() { return (tag_release | vmBit); }
205 inline static MEMFLAGS virtual_memory_type_tag() { return (tag_type | vmBit); }
206
207 public:
208 MemPointerRecord(): _size(0), _flags(mtNone) { }
209
210 MemPointerRecord(address addr, MEMFLAGS memflags, size_t size = 0):
211 MemPointer(addr), _flags(memflags), _size(size) { }
212
213 MemPointerRecord(const MemPointerRecord& copy_from):
214 MemPointer(copy_from), _flags(copy_from.flags()),
215 _size(copy_from.size()) {
216 }
217
218 /* MemPointerRecord is not sequenced, it always return
219 * 0 to indicate non-sequenced
220 */
221 virtual jint seq() const { return 0; }
222
223 inline size_t size() const { return _size; }
224 inline void set_size(size_t size) { _size = size; }
225
226 inline MEMFLAGS flags() const { return _flags; }
227 inline void set_flags(MEMFLAGS flags) { _flags = flags; }
228
229 MemPointerRecord& operator= (const MemPointerRecord& ptr) {
230 MemPointer::operator=(ptr);
231 _flags = ptr.flags();
232 #ifdef ASSERT
233 if (IS_ARENA_OBJ(_flags)) {
234 assert(!is_vm_pointer(), "wrong flags");
235 assert((_flags & ot_masks) == otArena, "wrong flags");
236 }
237 #endif
238 _size = ptr.size();
239 return *this;
240 }
241
242 // if the pointer represents a malloc-ed memory address
243 inline bool is_malloced_pointer() const {
244 return !is_vm_pointer();
245 }
246
247 // if the pointer represents a virtual memory address
248 inline bool is_vm_pointer() const {
249 return is_virtual_memory_record(_flags);
250 }
251
252 // if this record records a 'malloc' or virtual memory
253 // 'reserve' call
254 inline bool is_allocation_record() const {
255 return is_allocation_record(_flags);
256 }
257
258 // if this record records a size information of an arena
259 inline bool is_arena_size_record() const {
260 return is_arena_size_record(_flags);
261 }
262
263 // if this pointer represents an address to an arena object
264 inline bool is_arena_record() const {
265 return is_arena_record(_flags);
266 }
267
268 // if this record represents a size information of specific arena
269 inline bool is_size_record_of_arena(const MemPointerRecord* arena_rc) {
270 assert(is_arena_size_record(), "not size record");
271 assert(arena_rc->is_arena_record(), "not arena record");
272 return (arena_rc->addr() + sizeof(void*)) == addr();
273 }
274
275 // if this record records a 'free' or virtual memory 'free' call
276 inline bool is_deallocation_record() const {
277 return is_deallocation_record(_flags);
278 }
279
280 // if this record records a virtual memory 'commit' call
281 inline bool is_commit_record() const {
282 return is_virtual_memory_commit_record(_flags);
283 }
284
285 // if this record records a virtual memory 'uncommit' call
286 inline bool is_uncommit_record() const {
287 return is_virtual_memory_uncommit_record(_flags);
288 }
289
290 // if this record is a tagging record of a virtual memory block
291 inline bool is_type_tagging_record() const {
292 return is_virtual_memory_type_record(_flags);
293 }
294 };
295
296 // MemPointerRecordEx also records callsite pc, from where
297 // the memory block is allocated
298 class MemPointerRecordEx : public MemPointerRecord {
299 private:
300 address _pc; // callsite pc
301
302 public:
303 MemPointerRecordEx(): _pc(0) { }
304
305 MemPointerRecordEx(address addr, MEMFLAGS memflags, size_t size = 0, address pc = 0):
306 MemPointerRecord(addr, memflags, size), _pc(pc) {}
307
308 MemPointerRecordEx(const MemPointerRecordEx& copy_from):
309 MemPointerRecord(copy_from), _pc(copy_from.pc()) {}
310
311 inline address pc() const { return _pc; }
312
313 void init(const MemPointerRecordEx* mpe) {
314 MemPointerRecord::operator=(*mpe);
315 _pc = mpe->pc();
316 }
317
318 void init(const MemPointerRecord* mp) {
319 MemPointerRecord::operator=(*mp);
320 _pc = 0;
321 }
322 };
323
324 // a virtual memory region
325 class VMMemRegion : public MemPointerRecord {
326 private:
327 // committed size
328 size_t _committed_size;
329
330 public:
331 VMMemRegion(): _committed_size(0) { }
332
333 void init(const MemPointerRecord* mp) {
334 assert(mp->is_vm_pointer(), "not virtual memory pointer");
335 _addr = mp->addr();
336 if (mp->is_commit_record() || mp->is_uncommit_record()) {
337 _committed_size = mp->size();
338 set_size(_committed_size);
339 } else {
340 set_size(mp->size());
341 _committed_size = 0;
342 }
343 set_flags(mp->flags());
344 }
345
346 VMMemRegion& operator=(const VMMemRegion& other) {
347 MemPointerRecord::operator=(other);
348 _committed_size = other.committed_size();
349 return *this;
350 }
351
352 inline bool is_reserve_record() const {
353 return is_virtual_memory_reserve_record(flags());
354 }
355
356 inline bool is_release_record() const {
357 return is_virtual_memory_release_record(flags());
358 }
359
360 // resize reserved VM range
361 inline void set_reserved_size(size_t new_size) {
362 assert(new_size >= committed_size(), "resize");
363 set_size(new_size);
364 }
365
366 inline void commit(size_t size) {
367 _committed_size += size;
368 }
369
370 inline void uncommit(size_t size) {
371 if (_committed_size >= size) {
372 _committed_size -= size;
373 } else {
374 _committed_size = 0;
375 }
376 }
377
378 /*
379 * if this virtual memory range covers whole range of
380 * the other VMMemRegion
381 */
382 bool contains(const VMMemRegion* mr) const;
383
384 /* base address of this virtual memory range */
385 inline address base() const {
386 return addr();
387 }
388
389 /* tag this virtual memory range to the specified memory type */
390 inline void tag(MEMFLAGS f) {
391 set_flags(flags() | (f & mt_masks));
392 }
393
394 // release part of memory range
395 inline void partial_release(address add, size_t sz) {
396 assert(add >= addr() && add < addr() + size(), "not valid address");
397 // for now, it can partially release from the both ends,
398 // but not in the middle
399 assert(add == addr() || (add + sz) == (addr() + size()),
400 "release in the middle");
401 if (add == addr()) {
402 set_addr(add + sz);
403 set_size(size() - sz);
404 } else {
405 set_size(size() - sz);
406 }
407 }
408
409 // the committed size of the virtual memory block
410 inline size_t committed_size() const {
411 return _committed_size;
412 }
413
414 // the reserved size of the virtual memory block
415 inline size_t reserved_size() const {
416 return size();
417 }
418 };
419
420 class VMMemRegionEx : public VMMemRegion {
421 private:
422 jint _seq; // sequence number
423
424 public:
425 VMMemRegionEx(): _pc(0) { }
426
427 void init(const MemPointerRecordEx* mpe) {
428 VMMemRegion::init(mpe);
429 _pc = mpe->pc();
430 }
431
432 void init(const MemPointerRecord* mpe) {
433 VMMemRegion::init(mpe);
434 _pc = 0;
435 }
436
437 VMMemRegionEx& operator=(const VMMemRegionEx& other) {
438 VMMemRegion::operator=(other);
439 _pc = other.pc();
440 return *this;
441 }
442
443 inline address pc() const { return _pc; }
444 private:
445 address _pc;
446 };
447
448 /*
449 * Sequenced memory record
450 */
451 class SeqMemPointerRecord : public MemPointerRecord {
452 private:
453 jint _seq; // sequence number
454
455 public:
456 SeqMemPointerRecord(): _seq(0){ }
457
458 SeqMemPointerRecord(address addr, MEMFLAGS flags, size_t size)
459 : MemPointerRecord(addr, flags, size) {
460 _seq = SequenceGenerator::next();
461 }
462
463 SeqMemPointerRecord(const SeqMemPointerRecord& copy_from)
464 : MemPointerRecord(copy_from) {
465 _seq = copy_from.seq();
466 }
467
468 SeqMemPointerRecord& operator= (const SeqMemPointerRecord& ptr) {
469 MemPointerRecord::operator=(ptr);
470 _seq = ptr.seq();
471 return *this;
472 }
473
474 inline jint seq() const {
475 return _seq;
476 }
477 };
478
479
480
481 class SeqMemPointerRecordEx : public MemPointerRecordEx {
482 private:
483 jint _seq; // sequence number
484
485 public:
486 SeqMemPointerRecordEx(): _seq(0) { }
487
488 SeqMemPointerRecordEx(address addr, MEMFLAGS flags, size_t size,
489 address pc): MemPointerRecordEx(addr, flags, size, pc) {
490 _seq = SequenceGenerator::next();
491 }
492
493 SeqMemPointerRecordEx(const SeqMemPointerRecordEx& copy_from)
494 : MemPointerRecordEx(copy_from) {
495 _seq = copy_from.seq();
496 }
497
498 SeqMemPointerRecordEx& operator= (const SeqMemPointerRecordEx& ptr) {
499 MemPointerRecordEx::operator=(ptr);
500 _seq = ptr.seq();
501 return *this;
502 }
503
504 inline jint seq() const {
505 return _seq;
506 }
507 };
508
509 #endif // SHARE_VM_SERVICES_MEM_PTR_HPP