Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp @ 20356:439f0d76cff3
8029524: Remove unsused method CollectedHeap::unsafe_max_alloc()
Reviewed-by: pliden, jmasa
author | brutisso |
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date | Tue, 26 Aug 2014 10:28:43 +0200 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
28 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
29 #include "gc_implementation/parallelScavenge/psOldGen.hpp" | |
30 #include "gc_implementation/shared/spaceDecorator.hpp" | |
31 #include "memory/cardTableModRefBS.hpp" | |
32 #include "memory/gcLocker.inline.hpp" | |
33 #include "oops/oop.inline.hpp" | |
34 #include "runtime/java.hpp" | |
0 | 35 |
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36 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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37 |
0 | 38 inline const char* PSOldGen::select_name() { |
39 return UseParallelOldGC ? "ParOldGen" : "PSOldGen"; | |
40 } | |
41 | |
42 PSOldGen::PSOldGen(ReservedSpace rs, size_t alignment, | |
43 size_t initial_size, size_t min_size, size_t max_size, | |
44 const char* perf_data_name, int level): | |
45 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
46 _max_gen_size(max_size) | |
47 { | |
48 initialize(rs, alignment, perf_data_name, level); | |
49 } | |
50 | |
51 PSOldGen::PSOldGen(size_t initial_size, | |
52 size_t min_size, size_t max_size, | |
53 const char* perf_data_name, int level): | |
54 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
55 _max_gen_size(max_size) | |
56 {} | |
57 | |
58 void PSOldGen::initialize(ReservedSpace rs, size_t alignment, | |
59 const char* perf_data_name, int level) { | |
60 initialize_virtual_space(rs, alignment); | |
61 initialize_work(perf_data_name, level); | |
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62 |
0 | 63 // The old gen can grow to gen_size_limit(). _reserve reflects only |
64 // the current maximum that can be committed. | |
65 assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); | |
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66 |
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67 initialize_performance_counters(perf_data_name, level); |
0 | 68 } |
69 | |
70 void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
71 | |
72 _virtual_space = new PSVirtualSpace(rs, alignment); | |
73 if (!_virtual_space->expand_by(_init_gen_size)) { | |
74 vm_exit_during_initialization("Could not reserve enough space for " | |
75 "object heap"); | |
76 } | |
77 } | |
78 | |
79 void PSOldGen::initialize_work(const char* perf_data_name, int level) { | |
80 // | |
81 // Basic memory initialization | |
82 // | |
83 | |
84 MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), | |
85 heap_word_size(_max_gen_size)); | |
86 assert(limit_reserved.byte_size() == _max_gen_size, | |
87 "word vs bytes confusion"); | |
88 // | |
89 // Object start stuff | |
90 // | |
91 | |
92 start_array()->initialize(limit_reserved); | |
93 | |
94 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
95 (HeapWord*)virtual_space()->high_boundary()); | |
96 | |
97 // | |
98 // Card table stuff | |
99 // | |
100 | |
101 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
102 (HeapWord*)virtual_space()->high()); | |
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103 if (ZapUnusedHeapArea) { |
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104 // Mangle newly committed space immediately rather than |
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105 // waiting for the initialization of the space even though |
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106 // mangling is related to spaces. Doing it here eliminates |
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107 // the need to carry along information that a complete mangling |
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108 // (bottom to end) needs to be done. |
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109 SpaceMangler::mangle_region(cmr); |
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110 } |
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111 |
0 | 112 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
113 | |
114 CardTableModRefBS* _ct = (CardTableModRefBS*)Universe::heap()->barrier_set(); | |
115 assert (_ct->kind() == BarrierSet::CardTableModRef, "Sanity"); | |
116 | |
117 // Verify that the start and end of this generation is the start of a card. | |
118 // If this wasn't true, a single card could span more than one generation, | |
119 // which would cause problems when we commit/uncommit memory, and when we | |
120 // clear and dirty cards. | |
121 guarantee(_ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); | |
122 if (_reserved.end() != Universe::heap()->reserved_region().end()) { | |
123 // Don't check at the very end of the heap as we'll assert that we're probing off | |
124 // the end if we try. | |
125 guarantee(_ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); | |
126 } | |
127 | |
128 // | |
129 // ObjectSpace stuff | |
130 // | |
131 | |
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132 _object_space = new MutableSpace(virtual_space()->alignment()); |
0 | 133 |
134 if (_object_space == NULL) | |
135 vm_exit_during_initialization("Could not allocate an old gen space"); | |
136 | |
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137 object_space()->initialize(cmr, |
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138 SpaceDecorator::Clear, |
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139 SpaceDecorator::Mangle); |
0 | 140 |
141 _object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); | |
142 | |
143 if (_object_mark_sweep == NULL) | |
144 vm_exit_during_initialization("Could not complete allocation of old generation"); | |
145 | |
146 // Update the start_array | |
147 start_array()->set_covered_region(cmr); | |
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148 } |
0 | 149 |
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150 void PSOldGen::initialize_performance_counters(const char* perf_data_name, int level) { |
0 | 151 // Generation Counters, generation 'level', 1 subspace |
152 _gen_counters = new PSGenerationCounters(perf_data_name, level, 1, | |
153 virtual_space()); | |
154 _space_counters = new SpaceCounters(perf_data_name, 0, | |
155 virtual_space()->reserved_size(), | |
156 _object_space, _gen_counters); | |
157 } | |
158 | |
159 // Assume that the generation has been allocated if its | |
160 // reserved size is not 0. | |
161 bool PSOldGen::is_allocated() { | |
162 return virtual_space()->reserved_size() != 0; | |
163 } | |
164 | |
165 void PSOldGen::precompact() { | |
166 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
167 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
168 | |
169 // Reset start array first. | |
170 start_array()->reset(); | |
171 | |
172 object_mark_sweep()->precompact(); | |
173 | |
174 // Now compact the young gen | |
175 heap->young_gen()->precompact(); | |
176 } | |
177 | |
178 void PSOldGen::adjust_pointers() { | |
179 object_mark_sweep()->adjust_pointers(); | |
180 } | |
181 | |
182 void PSOldGen::compact() { | |
183 object_mark_sweep()->compact(ZapUnusedHeapArea); | |
184 } | |
185 | |
186 size_t PSOldGen::contiguous_available() const { | |
187 return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); | |
188 } | |
189 | |
190 // Allocation. We report all successful allocations to the size policy | |
191 // Note that the perm gen does not use this method, and should not! | |
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192 HeapWord* PSOldGen::allocate(size_t word_size) { |
0 | 193 assert_locked_or_safepoint(Heap_lock); |
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194 HeapWord* res = allocate_noexpand(word_size); |
0 | 195 |
196 if (res == NULL) { | |
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197 res = expand_and_allocate(word_size); |
0 | 198 } |
199 | |
200 // Allocations in the old generation need to be reported | |
201 if (res != NULL) { | |
202 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
203 heap->size_policy()->tenured_allocation(word_size); | |
204 } | |
205 | |
206 return res; | |
207 } | |
208 | |
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209 HeapWord* PSOldGen::expand_and_allocate(size_t word_size) { |
0 | 210 expand(word_size*HeapWordSize); |
211 if (GCExpandToAllocateDelayMillis > 0) { | |
212 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
213 } | |
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214 return allocate_noexpand(word_size); |
0 | 215 } |
216 | |
217 HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { | |
218 expand(word_size*HeapWordSize); | |
219 if (GCExpandToAllocateDelayMillis > 0) { | |
220 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
221 } | |
222 return cas_allocate_noexpand(word_size); | |
223 } | |
224 | |
225 void PSOldGen::expand(size_t bytes) { | |
271
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226 if (bytes == 0) { |
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227 return; |
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228 } |
0 | 229 MutexLocker x(ExpandHeap_lock); |
230 const size_t alignment = virtual_space()->alignment(); | |
231 size_t aligned_bytes = align_size_up(bytes, alignment); | |
232 size_t aligned_expand_bytes = align_size_up(MinHeapDeltaBytes, alignment); | |
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233 |
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234 if (UseNUMA) { |
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235 // With NUMA we use round-robin page allocation for the old gen. Expand by at least |
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236 // providing a page per lgroup. Alignment is larger or equal to the page size. |
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237 aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
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238 } |
271
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239 if (aligned_bytes == 0){ |
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240 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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241 // return true with the implication that and expansion was done when it |
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242 // was not. A call to expand implies a best effort to expand by "bytes" |
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243 // but not a guarantee. Align down to give a best effort. This is likely |
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244 // the most that the generation can expand since it has some capacity to |
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245 // start with. |
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246 aligned_bytes = align_size_down(bytes, alignment); |
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247 } |
0 | 248 |
249 bool success = false; | |
250 if (aligned_expand_bytes > aligned_bytes) { | |
251 success = expand_by(aligned_expand_bytes); | |
252 } | |
253 if (!success) { | |
254 success = expand_by(aligned_bytes); | |
255 } | |
256 if (!success) { | |
257 success = expand_to_reserved(); | |
258 } | |
259 | |
271
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260 if (PrintGC && Verbose) { |
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261 if (success && GC_locker::is_active_and_needs_gc()) { |
0 | 262 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
263 } | |
264 } | |
265 } | |
266 | |
267 bool PSOldGen::expand_by(size_t bytes) { | |
268 assert_lock_strong(ExpandHeap_lock); | |
269 assert_locked_or_safepoint(Heap_lock); | |
271
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270 if (bytes == 0) { |
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271 return true; // That's what virtual_space()->expand_by(0) would return |
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272 } |
0 | 273 bool result = virtual_space()->expand_by(bytes); |
274 if (result) { | |
263
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275 if (ZapUnusedHeapArea) { |
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276 // We need to mangle the newly expanded area. The memregion spans |
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277 // end -> new_end, we assume that top -> end is already mangled. |
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278 // Do the mangling before post_resize() is called because |
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279 // the space is available for allocation after post_resize(); |
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280 HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
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281 assert(object_space()->end() < virtual_space_high, |
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282 "Should be true before post_resize()"); |
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283 MemRegion mangle_region(object_space()->end(), virtual_space_high); |
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284 // Note that the object space has not yet been updated to |
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285 // coincede with the new underlying virtual space. |
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286 SpaceMangler::mangle_region(mangle_region); |
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287 } |
0 | 288 post_resize(); |
289 if (UsePerfData) { | |
290 _space_counters->update_capacity(); | |
291 _gen_counters->update_all(); | |
292 } | |
293 } | |
294 | |
295 if (result && Verbose && PrintGC) { | |
296 size_t new_mem_size = virtual_space()->committed_size(); | |
297 size_t old_mem_size = new_mem_size - bytes; | |
298 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
299 SIZE_FORMAT "K to " | |
300 SIZE_FORMAT "K", | |
301 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
302 } | |
303 | |
304 return result; | |
305 } | |
306 | |
307 bool PSOldGen::expand_to_reserved() { | |
308 assert_lock_strong(ExpandHeap_lock); | |
309 assert_locked_or_safepoint(Heap_lock); | |
310 | |
311 bool result = true; | |
312 const size_t remaining_bytes = virtual_space()->uncommitted_size(); | |
313 if (remaining_bytes > 0) { | |
314 result = expand_by(remaining_bytes); | |
315 DEBUG_ONLY(if (!result) warning("grow to reserve failed")); | |
316 } | |
317 return result; | |
318 } | |
319 | |
320 void PSOldGen::shrink(size_t bytes) { | |
321 assert_lock_strong(ExpandHeap_lock); | |
322 assert_locked_or_safepoint(Heap_lock); | |
323 | |
324 size_t size = align_size_down(bytes, virtual_space()->alignment()); | |
325 if (size > 0) { | |
326 assert_lock_strong(ExpandHeap_lock); | |
327 virtual_space()->shrink_by(bytes); | |
328 post_resize(); | |
329 | |
330 if (Verbose && PrintGC) { | |
331 size_t new_mem_size = virtual_space()->committed_size(); | |
332 size_t old_mem_size = new_mem_size + bytes; | |
333 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by " | |
334 SIZE_FORMAT "K to " | |
335 SIZE_FORMAT "K", | |
336 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
337 } | |
338 } | |
339 } | |
340 | |
341 void PSOldGen::resize(size_t desired_free_space) { | |
342 const size_t alignment = virtual_space()->alignment(); | |
343 const size_t size_before = virtual_space()->committed_size(); | |
344 size_t new_size = used_in_bytes() + desired_free_space; | |
345 if (new_size < used_in_bytes()) { | |
346 // Overflowed the addition. | |
347 new_size = gen_size_limit(); | |
348 } | |
349 // Adjust according to our min and max | |
350 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); | |
351 | |
352 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); | |
353 new_size = align_size_up(new_size, alignment); | |
354 | |
355 const size_t current_size = capacity_in_bytes(); | |
356 | |
357 if (PrintAdaptiveSizePolicy && Verbose) { | |
358 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
359 "desired free: " SIZE_FORMAT " used: " SIZE_FORMAT | |
360 " new size: " SIZE_FORMAT " current size " SIZE_FORMAT | |
361 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
362 desired_free_space, used_in_bytes(), new_size, current_size, | |
363 gen_size_limit(), min_gen_size()); | |
364 } | |
365 | |
366 if (new_size == current_size) { | |
367 // No change requested | |
368 return; | |
369 } | |
370 if (new_size > current_size) { | |
371 size_t change_bytes = new_size - current_size; | |
372 expand(change_bytes); | |
373 } else { | |
374 size_t change_bytes = current_size - new_size; | |
375 // shrink doesn't grab this lock, expand does. Is that right? | |
376 MutexLocker x(ExpandHeap_lock); | |
377 shrink(change_bytes); | |
378 } | |
379 | |
380 if (PrintAdaptiveSizePolicy) { | |
381 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
382 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
383 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
384 "collection: %d " | |
385 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
386 heap->total_collections(), | |
387 size_before, virtual_space()->committed_size()); | |
388 } | |
389 } | |
390 | |
391 // NOTE! We need to be careful about resizing. During a GC, multiple | |
392 // allocators may be active during heap expansion. If we allow the | |
393 // heap resizing to become visible before we have correctly resized | |
394 // all heap related data structures, we may cause program failures. | |
395 void PSOldGen::post_resize() { | |
396 // First construct a memregion representing the new size | |
397 MemRegion new_memregion((HeapWord*)virtual_space()->low(), | |
398 (HeapWord*)virtual_space()->high()); | |
399 size_t new_word_size = new_memregion.word_size(); | |
400 | |
401 start_array()->set_covered_region(new_memregion); | |
402 Universe::heap()->barrier_set()->resize_covered_region(new_memregion); | |
403 | |
404 // ALWAYS do this last!! | |
535
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405 object_space()->initialize(new_memregion, |
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406 SpaceDecorator::DontClear, |
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407 SpaceDecorator::DontMangle); |
0 | 408 |
409 assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), | |
410 "Sanity"); | |
411 } | |
412 | |
413 size_t PSOldGen::gen_size_limit() { | |
414 return _max_gen_size; | |
415 } | |
416 | |
417 void PSOldGen::reset_after_change() { | |
418 ShouldNotReachHere(); | |
419 return; | |
420 } | |
421 | |
422 size_t PSOldGen::available_for_expansion() { | |
423 ShouldNotReachHere(); | |
424 return 0; | |
425 } | |
426 | |
427 size_t PSOldGen::available_for_contraction() { | |
428 ShouldNotReachHere(); | |
429 return 0; | |
430 } | |
431 | |
432 void PSOldGen::print() const { print_on(tty);} | |
433 void PSOldGen::print_on(outputStream* st) const { | |
434 st->print(" %-15s", name()); | |
435 if (PrintGCDetails && Verbose) { | |
436 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
437 capacity_in_bytes(), used_in_bytes()); | |
438 } else { | |
439 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
440 capacity_in_bytes()/K, used_in_bytes()/K); | |
441 } | |
442 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
443 virtual_space()->low_boundary(), | |
444 virtual_space()->high(), | |
445 virtual_space()->high_boundary()); | |
446 | |
447 st->print(" object"); object_space()->print_on(st); | |
448 } | |
449 | |
450 void PSOldGen::print_used_change(size_t prev_used) const { | |
451 gclog_or_tty->print(" [%s:", name()); | |
452 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
453 "->" SIZE_FORMAT "K" | |
454 "(" SIZE_FORMAT "K)", | |
455 prev_used / K, used_in_bytes() / K, | |
456 capacity_in_bytes() / K); | |
457 gclog_or_tty->print("]"); | |
458 } | |
459 | |
460 void PSOldGen::update_counters() { | |
461 if (UsePerfData) { | |
462 _space_counters->update_all(); | |
463 _gen_counters->update_all(); | |
464 } | |
465 } | |
466 | |
467 #ifndef PRODUCT | |
468 | |
469 void PSOldGen::space_invariants() { | |
470 assert(object_space()->end() == (HeapWord*) virtual_space()->high(), | |
471 "Space invariant"); | |
472 assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), | |
473 "Space invariant"); | |
474 assert(virtual_space()->low_boundary() <= virtual_space()->low(), | |
475 "Space invariant"); | |
476 assert(virtual_space()->high_boundary() >= virtual_space()->high(), | |
477 "Space invariant"); | |
478 assert(virtual_space()->low_boundary() == (char*) _reserved.start(), | |
479 "Space invariant"); | |
480 assert(virtual_space()->high_boundary() == (char*) _reserved.end(), | |
481 "Space invariant"); | |
482 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
483 "Space invariant"); | |
484 } | |
485 #endif | |
486 | |
6008 | 487 void PSOldGen::verify() { |
488 object_space()->verify(); | |
0 | 489 } |
490 class VerifyObjectStartArrayClosure : public ObjectClosure { | |
491 PSOldGen* _gen; | |
492 ObjectStartArray* _start_array; | |
493 | |
494 public: | |
495 VerifyObjectStartArrayClosure(PSOldGen* gen, ObjectStartArray* start_array) : | |
496 _gen(gen), _start_array(start_array) { } | |
497 | |
498 virtual void do_object(oop obj) { | |
499 HeapWord* test_addr = (HeapWord*)obj + 1; | |
500 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); | |
501 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); | |
502 } | |
503 }; | |
504 | |
505 void PSOldGen::verify_object_start_array() { | |
506 VerifyObjectStartArrayClosure check( this, &_start_array ); | |
507 object_iterate(&check); | |
508 } | |
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509 |
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510 #ifndef PRODUCT |
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511 void PSOldGen::record_spaces_top() { |
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512 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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513 object_space()->set_top_for_allocations(); |
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514 } |
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515 #endif |