1 /*
2 * Copyright (c) 2013, 2015, 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 #include "precompiled.hpp"
25
26 #include "runtime/threadCritical.hpp"
27 #include "services/virtualMemoryTracker.hpp"
28
29 size_t VirtualMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)];
30
31 void VirtualMemorySummary::initialize() {
32 assert(sizeof(_snapshot) >= sizeof(VirtualMemorySnapshot), "Sanity Check");
33 // Use placement operator new to initialize static data area.
34 ::new ((void*)_snapshot) VirtualMemorySnapshot();
35 }
36
37 SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* VirtualMemoryTracker::_reserved_regions;
38
39 int compare_committed_region(const CommittedMemoryRegion& r1, const CommittedMemoryRegion& r2) {
40 return r1.compare(r2);
41 }
42
43 int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2) {
44 return r1.compare(r2);
45 }
46
47 bool ReservedMemoryRegion::add_committed_region(address addr, size_t size, const NativeCallStack& stack) {
48 assert(addr != NULL, "Invalid address");
49 assert(size > 0, "Invalid size");
50 assert(contain_region(addr, size), "Not contain this region");
51
52 if (all_committed()) return true;
53
54 CommittedMemoryRegion committed_rgn(addr, size, stack);
55 LinkedListNode<CommittedMemoryRegion>* node = _committed_regions.find_node(committed_rgn);
56 if (node != NULL) {
57 CommittedMemoryRegion* rgn = node->data();
58 if (rgn->same_region(addr, size)) {
59 return true;
60 }
61
62 if (rgn->adjacent_to(addr, size)) {
63 // check if the next region covers this committed region,
64 // the regions may not be merged due to different call stacks
65 LinkedListNode<CommittedMemoryRegion>* next =
66 node->next();
67 if (next != NULL && next->data()->contain_region(addr, size)) {
68 if (next->data()->same_region(addr, size)) {
69 next->data()->set_call_stack(stack);
70 }
71 return true;
72 }
73 if (rgn->call_stack()->equals(stack)) {
74 VirtualMemorySummary::record_uncommitted_memory(rgn->size(), flag());
75 // the two adjacent regions have the same call stack, merge them
76 rgn->expand_region(addr, size);
77 VirtualMemorySummary::record_committed_memory(rgn->size(), flag());
78 return true;
79 }
80 VirtualMemorySummary::record_committed_memory(size, flag());
81 if (rgn->base() > addr) {
82 return _committed_regions.insert_before(committed_rgn, node) != NULL;
83 } else {
84 return _committed_regions.insert_after(committed_rgn, node) != NULL;
85 }
86 }
87 assert(rgn->contain_region(addr, size), "Must cover this region");
88 return true;
89 } else {
90 // New committed region
91 VirtualMemorySummary::record_committed_memory(size, flag());
92 return add_committed_region(committed_rgn);
93 }
94 }
95
96 void ReservedMemoryRegion::set_all_committed(bool b) {
97 if (all_committed() != b) {
98 _all_committed = b;
99 if (b) {
100 VirtualMemorySummary::record_committed_memory(size(), flag());
101 }
102 }
103 }
104
105 bool ReservedMemoryRegion::remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node,
106 address addr, size_t size) {
107 assert(addr != NULL, "Invalid address");
108 assert(size > 0, "Invalid size");
109
110 CommittedMemoryRegion* rgn = node->data();
111 assert(rgn->contain_region(addr, size), "Has to be contained");
112 assert(!rgn->same_region(addr, size), "Can not be the same region");
113
114 if (rgn->base() == addr ||
115 rgn->end() == addr + size) {
116 rgn->exclude_region(addr, size);
117 return true;
118 } else {
119 // split this region
120 address top =rgn->end();
121 // use this region for lower part
122 size_t exclude_size = rgn->end() - addr;
123 rgn->exclude_region(addr, exclude_size);
124
125 // higher part
126 address high_base = addr + size;
127 size_t high_size = top - high_base;
128
129 CommittedMemoryRegion high_rgn(high_base, high_size, *rgn->call_stack());
130 LinkedListNode<CommittedMemoryRegion>* high_node = _committed_regions.add(high_rgn);
131 assert(high_node == NULL || node->next() == high_node, "Should be right after");
132 return (high_node != NULL);
133 }
134
135 return false;
136 }
137
138 bool ReservedMemoryRegion::remove_uncommitted_region(address addr, size_t sz) {
139 // uncommit stack guard pages
140 if (flag() == mtThreadStack && !same_region(addr, sz)) {
141 return true;
142 }
143
144 assert(addr != NULL, "Invalid address");
145 assert(sz > 0, "Invalid size");
146
147 if (all_committed()) {
148 assert(_committed_regions.is_empty(), "Sanity check");
149 assert(contain_region(addr, sz), "Reserved region does not contain this region");
150 set_all_committed(false);
151 VirtualMemorySummary::record_uncommitted_memory(sz, flag());
152 if (same_region(addr, sz)) {
153 return true;
154 } else {
155 CommittedMemoryRegion rgn(base(), size(), *call_stack());
156 if (rgn.base() == addr || rgn.end() == (addr + sz)) {
157 rgn.exclude_region(addr, sz);
158 return add_committed_region(rgn);
159 } else {
160 // split this region
161 // top of the whole region
162 address top =rgn.end();
163 // use this region for lower part
164 size_t exclude_size = rgn.end() - addr;
165 rgn.exclude_region(addr, exclude_size);
166 if (add_committed_region(rgn)) {
167 // higher part
168 address high_base = addr + sz;
169 size_t high_size = top - high_base;
170 CommittedMemoryRegion high_rgn(high_base, high_size, NativeCallStack::EMPTY_STACK);
171 return add_committed_region(high_rgn);
172 } else {
173 return false;
174 }
175 }
176 }
177 } else {
178 // we have to walk whole list to remove the committed regions in
179 // specified range
180 LinkedListNode<CommittedMemoryRegion>* head =
181 _committed_regions.head();
182 LinkedListNode<CommittedMemoryRegion>* prev = NULL;
183 VirtualMemoryRegion uncommitted_rgn(addr, sz);
184
185 while (head != NULL && !uncommitted_rgn.is_empty()) {
186 CommittedMemoryRegion* crgn = head->data();
187 // this committed region overlaps to region to uncommit
188 if (crgn->overlap_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
189 if (crgn->same_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
190 // find matched region, remove the node will do
191 VirtualMemorySummary::record_uncommitted_memory(uncommitted_rgn.size(), flag());
192 _committed_regions.remove_after(prev);
193 return true;
194 } else if (crgn->contain_region(uncommitted_rgn.base(), uncommitted_rgn.size())) {
195 // this committed region contains whole uncommitted region
196 VirtualMemorySummary::record_uncommitted_memory(uncommitted_rgn.size(), flag());
197 return remove_uncommitted_region(head, uncommitted_rgn.base(), uncommitted_rgn.size());
198 } else if (uncommitted_rgn.contain_region(crgn->base(), crgn->size())) {
199 // this committed region has been uncommitted
200 size_t exclude_size = crgn->end() - uncommitted_rgn.base();
201 uncommitted_rgn.exclude_region(uncommitted_rgn.base(), exclude_size);
202 VirtualMemorySummary::record_uncommitted_memory(crgn->size(), flag());
203 LinkedListNode<CommittedMemoryRegion>* tmp = head;
204 head = head->next();
205 _committed_regions.remove_after(prev);
206 continue;
207 } else if (crgn->contain_address(uncommitted_rgn.base())) {
208 size_t toUncommitted = crgn->end() - uncommitted_rgn.base();
209 crgn->exclude_region(uncommitted_rgn.base(), toUncommitted);
210 uncommitted_rgn.exclude_region(uncommitted_rgn.base(), toUncommitted);
211 VirtualMemorySummary::record_uncommitted_memory(toUncommitted, flag());
212 } else if (uncommitted_rgn.contain_address(crgn->base())) {
213 size_t toUncommitted = uncommitted_rgn.end() - crgn->base();
214 crgn->exclude_region(crgn->base(), toUncommitted);
215 uncommitted_rgn.exclude_region(uncommitted_rgn.end() - toUncommitted,
216 toUncommitted);
217 VirtualMemorySummary::record_uncommitted_memory(toUncommitted, flag());
218 }
219 }
220 prev = head;
221 head = head->next();
222 }
223 }
224
225 return true;
226 }
227
228 void ReservedMemoryRegion::move_committed_regions(address addr, ReservedMemoryRegion& rgn) {
229 assert(addr != NULL, "Invalid address");
230
231 // split committed regions
232 LinkedListNode<CommittedMemoryRegion>* head =
233 _committed_regions.head();
234 LinkedListNode<CommittedMemoryRegion>* prev = NULL;
235
236 while (head != NULL) {
237 if (head->data()->base() >= addr) {
238 break;
239 }
240 prev = head;
241 head = head->next();
242 }
243
244 if (head != NULL) {
245 if (prev != NULL) {
246 prev->set_next(head->next());
247 } else {
248 _committed_regions.set_head(NULL);
249 }
250 }
251
252 rgn._committed_regions.set_head(head);
253 }
254
255 size_t ReservedMemoryRegion::committed_size() const {
256 if (all_committed()) {
257 return size();
258 } else {
259 size_t committed = 0;
260 LinkedListNode<CommittedMemoryRegion>* head =
261 _committed_regions.head();
262 while (head != NULL) {
263 committed += head->data()->size();
264 head = head->next();
265 }
266 return committed;
267 }
268 }
269
270 void ReservedMemoryRegion::set_flag(MEMFLAGS f) {
271 assert((flag() == mtNone || flag() == f), "Overwrite memory type");
272 if (flag() != f) {
273 VirtualMemorySummary::move_reserved_memory(flag(), f, size());
274 VirtualMemorySummary::move_committed_memory(flag(), f, committed_size());
275 _flag = f;
276 }
277 }
278
279 bool VirtualMemoryTracker::initialize(NMT_TrackingLevel level) {
280 if (level >= NMT_summary) {
281 VirtualMemorySummary::initialize();
282 }
283 return true;
284 }
285
286 bool VirtualMemoryTracker::late_initialize(NMT_TrackingLevel level) {
287 if (level >= NMT_summary) {
288 _reserved_regions = new (std::nothrow, ResourceObj::C_HEAP, mtNMT)
289 SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>();
290 return (_reserved_regions != NULL);
291 }
292 return true;
293 }
294
295 bool VirtualMemoryTracker::add_reserved_region(address base_addr, size_t size,
296 const NativeCallStack& stack, MEMFLAGS flag, bool all_committed) {
297 assert(base_addr != NULL, "Invalid address");
298 assert(size > 0, "Invalid size");
299 assert(_reserved_regions != NULL, "Sanity check");
300 ReservedMemoryRegion rgn(base_addr, size, stack, flag);
301 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn);
302 LinkedListNode<ReservedMemoryRegion>* node;
303 if (reserved_rgn == NULL) {
304 VirtualMemorySummary::record_reserved_memory(size, flag);
305 node = _reserved_regions->add(rgn);
306 if (node != NULL) {
307 node->data()->set_all_committed(all_committed);
308 return true;
309 } else {
310 return false;
311 }
312 } else {
313 if (reserved_rgn->same_region(base_addr, size)) {
314 reserved_rgn->set_call_stack(stack);
315 reserved_rgn->set_flag(flag);
316 return true;
317 } else if (reserved_rgn->adjacent_to(base_addr, size)) {
318 VirtualMemorySummary::record_reserved_memory(size, flag);
319 reserved_rgn->expand_region(base_addr, size);
320 reserved_rgn->set_call_stack(stack);
321 return true;
322 } else {
323 // Overlapped reservation.
324 // It can happen when the regions are thread stacks, as JNI
325 // thread does not detach from VM before exits, and leads to
326 // leak JavaThread object
327 if (reserved_rgn->flag() == mtThreadStack) {
328 guarantee(!CheckJNICalls, "Attached JNI thread exited without being detached");
329 // Overwrite with new region
330
331 // Release old region
332 VirtualMemorySummary::record_uncommitted_memory(reserved_rgn->committed_size(), reserved_rgn->flag());
333 VirtualMemorySummary::record_released_memory(reserved_rgn->size(), reserved_rgn->flag());
334
335 // Add new region
336 VirtualMemorySummary::record_reserved_memory(rgn.size(), flag);
337
338 *reserved_rgn = rgn;
339 return true;
340 }
341
342 // CDS mapping region.
343 // CDS reserves the whole region for mapping CDS archive, then maps each section into the region.
344 // NMT reports CDS as a whole.
345 if (reserved_rgn->flag() == mtClassShared) {
346 assert(reserved_rgn->contain_region(base_addr, size), "Reserved CDS region should contain this mapping region");
347 return true;
348 }
349
350 // Mapped CDS string region.
351 // The string region(s) is part of the java heap.
352 if (reserved_rgn->flag() == mtJavaHeap) {
353 assert(reserved_rgn->contain_region(base_addr, size), "Reserved heap region should contain this mapping region");
354 return true;
355 }
356
357 ShouldNotReachHere();
358 return false;
359 }
360 }
361 }
362
363 void VirtualMemoryTracker::set_reserved_region_type(address addr, MEMFLAGS flag) {
364 assert(addr != NULL, "Invalid address");
365 assert(_reserved_regions != NULL, "Sanity check");
366
367 ReservedMemoryRegion rgn(addr, 1);
368 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn);
369 if (reserved_rgn != NULL) {
370 assert(reserved_rgn->contain_address(addr), "Containment");
371 if (reserved_rgn->flag() != flag) {
372 assert(reserved_rgn->flag() == mtNone, "Overwrite memory type");
373 reserved_rgn->set_flag(flag);
374 }
375 }
376 }
377
378 bool VirtualMemoryTracker::add_committed_region(address addr, size_t size,
379 const NativeCallStack& stack) {
380 assert(addr != NULL, "Invalid address");
381 assert(size > 0, "Invalid size");
382 assert(_reserved_regions != NULL, "Sanity check");
383
384 ReservedMemoryRegion rgn(addr, size);
385 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn);
386
387 assert(reserved_rgn != NULL, "No reserved region");
388 assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
389 return reserved_rgn->add_committed_region(addr, size, stack);
390 }
391
392 bool VirtualMemoryTracker::remove_uncommitted_region(address addr, size_t size) {
393 assert(addr != NULL, "Invalid address");
394 assert(size > 0, "Invalid size");
395 assert(_reserved_regions != NULL, "Sanity check");
396
397 ReservedMemoryRegion rgn(addr, size);
398 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn);
399 assert(reserved_rgn != NULL, "No reserved region");
400 assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
401 return reserved_rgn->remove_uncommitted_region(addr, size);
402 }
403
404 bool VirtualMemoryTracker::remove_released_region(address addr, size_t size) {
405 assert(addr != NULL, "Invalid address");
406 assert(size > 0, "Invalid size");
407 assert(_reserved_regions != NULL, "Sanity check");
408
409 ReservedMemoryRegion rgn(addr, size);
410 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn);
411
412 assert(reserved_rgn != NULL, "No reserved region");
413
414 // uncommit regions within the released region
415 if (!reserved_rgn->remove_uncommitted_region(addr, size)) {
416 return false;
417 }
418
419 if (reserved_rgn->flag() == mtClassShared &&
420 reserved_rgn->contain_region(addr, size) &&
421 !reserved_rgn->same_region(addr, size)) {
422 // This is an unmapped CDS region, which is part of the reserved shared
423 // memory region.
424 // See special handling in VirtualMemoryTracker::add_reserved_region also.
425 return true;
426 }
427
428 VirtualMemorySummary::record_released_memory(size, reserved_rgn->flag());
429
430 if (reserved_rgn->same_region(addr, size)) {
431 return _reserved_regions->remove(rgn);
432 } else {
433 assert(reserved_rgn->contain_region(addr, size), "Not completely contained");
434 if (reserved_rgn->base() == addr ||
435 reserved_rgn->end() == addr + size) {
436 reserved_rgn->exclude_region(addr, size);
437 return true;
438 } else {
439 address top = reserved_rgn->end();
440 address high_base = addr + size;
441 ReservedMemoryRegion high_rgn(high_base, top - high_base,
442 *reserved_rgn->call_stack(), reserved_rgn->flag());
443
444 // use original region for lower region
445 reserved_rgn->exclude_region(addr, top - addr);
446 LinkedListNode<ReservedMemoryRegion>* new_rgn = _reserved_regions->add(high_rgn);
447 if (new_rgn == NULL) {
448 return false;
449 } else {
450 reserved_rgn->move_committed_regions(addr, *new_rgn->data());
451 return true;
452 }
453 }
454 }
455 }
456
457
458 bool VirtualMemoryTracker::walk_virtual_memory(VirtualMemoryWalker* walker) {
459 assert(_reserved_regions != NULL, "Sanity check");
460 ThreadCritical tc;
461 // Check that the _reserved_regions haven't been deleted.
462 if (_reserved_regions != NULL) {
463 LinkedListNode<ReservedMemoryRegion>* head = _reserved_regions->head();
464 while (head != NULL) {
465 const ReservedMemoryRegion* rgn = head->peek();
466 if (!walker->do_allocation_site(rgn)) {
467 return false;
468 }
469 head = head->next();
470 }
471 }
472 return true;
473 }
474
475 // Transition virtual memory tracking level.
476 bool VirtualMemoryTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) {
477 assert (from != NMT_minimal, "cannot convert from the lowest tracking level to anything");
478 if (to == NMT_minimal) {
479 assert(from == NMT_summary || from == NMT_detail, "Just check");
480 // Clean up virtual memory tracking data structures.
481 ThreadCritical tc;
482 // Check for potential race with other thread calling transition
483 if (_reserved_regions != NULL) {
484 delete _reserved_regions;
485 _reserved_regions = NULL;
486 }
487 }
488
489 return true;
490 }
491
492