Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp @ 12943:996d1f2f056f
8026930: In ManagementAgent.start it should be possible to set the jdp.name parameter (hotspot part)
Summary: Pass one more property from Agent to JdpController
Reviewed-by: jbachorik, sla
author | dsamersoff |
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date | Sat, 19 Oct 2013 21:29:57 +0400 |
parents | cc5b5976d72c |
children | de6a9e811145 |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 2001, 2012, 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 |
36 inline const char* PSOldGen::select_name() { | |
37 return UseParallelOldGC ? "ParOldGen" : "PSOldGen"; | |
38 } | |
39 | |
40 PSOldGen::PSOldGen(ReservedSpace rs, size_t alignment, | |
41 size_t initial_size, size_t min_size, size_t max_size, | |
42 const char* perf_data_name, int level): | |
43 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
44 _max_gen_size(max_size) | |
45 { | |
46 initialize(rs, alignment, perf_data_name, level); | |
47 } | |
48 | |
49 PSOldGen::PSOldGen(size_t initial_size, | |
50 size_t min_size, size_t max_size, | |
51 const char* perf_data_name, int level): | |
52 _name(select_name()), _init_gen_size(initial_size), _min_gen_size(min_size), | |
53 _max_gen_size(max_size) | |
54 {} | |
55 | |
56 void PSOldGen::initialize(ReservedSpace rs, size_t alignment, | |
57 const char* perf_data_name, int level) { | |
58 initialize_virtual_space(rs, alignment); | |
59 initialize_work(perf_data_name, level); | |
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60 |
0 | 61 // The old gen can grow to gen_size_limit(). _reserve reflects only |
62 // the current maximum that can be committed. | |
63 assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); | |
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64 |
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65 initialize_performance_counters(perf_data_name, level); |
0 | 66 } |
67 | |
68 void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
69 | |
70 _virtual_space = new PSVirtualSpace(rs, alignment); | |
71 if (!_virtual_space->expand_by(_init_gen_size)) { | |
72 vm_exit_during_initialization("Could not reserve enough space for " | |
73 "object heap"); | |
74 } | |
75 } | |
76 | |
77 void PSOldGen::initialize_work(const char* perf_data_name, int level) { | |
78 // | |
79 // Basic memory initialization | |
80 // | |
81 | |
82 MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), | |
83 heap_word_size(_max_gen_size)); | |
84 assert(limit_reserved.byte_size() == _max_gen_size, | |
85 "word vs bytes confusion"); | |
86 // | |
87 // Object start stuff | |
88 // | |
89 | |
90 start_array()->initialize(limit_reserved); | |
91 | |
92 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
93 (HeapWord*)virtual_space()->high_boundary()); | |
94 | |
95 // | |
96 // Card table stuff | |
97 // | |
98 | |
99 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
100 (HeapWord*)virtual_space()->high()); | |
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101 if (ZapUnusedHeapArea) { |
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102 // Mangle newly committed space immediately rather than |
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103 // waiting for the initialization of the space even though |
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104 // mangling is related to spaces. Doing it here eliminates |
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105 // the need to carry along information that a complete mangling |
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106 // (bottom to end) needs to be done. |
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107 SpaceMangler::mangle_region(cmr); |
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108 } |
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109 |
0 | 110 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
111 | |
112 CardTableModRefBS* _ct = (CardTableModRefBS*)Universe::heap()->barrier_set(); | |
113 assert (_ct->kind() == BarrierSet::CardTableModRef, "Sanity"); | |
114 | |
115 // Verify that the start and end of this generation is the start of a card. | |
116 // If this wasn't true, a single card could span more than one generation, | |
117 // which would cause problems when we commit/uncommit memory, and when we | |
118 // clear and dirty cards. | |
119 guarantee(_ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); | |
120 if (_reserved.end() != Universe::heap()->reserved_region().end()) { | |
121 // Don't check at the very end of the heap as we'll assert that we're probing off | |
122 // the end if we try. | |
123 guarantee(_ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); | |
124 } | |
125 | |
126 // | |
127 // ObjectSpace stuff | |
128 // | |
129 | |
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130 _object_space = new MutableSpace(virtual_space()->alignment()); |
0 | 131 |
132 if (_object_space == NULL) | |
133 vm_exit_during_initialization("Could not allocate an old gen space"); | |
134 | |
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135 object_space()->initialize(cmr, |
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136 SpaceDecorator::Clear, |
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137 SpaceDecorator::Mangle); |
0 | 138 |
139 _object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); | |
140 | |
141 if (_object_mark_sweep == NULL) | |
142 vm_exit_during_initialization("Could not complete allocation of old generation"); | |
143 | |
144 // Update the start_array | |
145 start_array()->set_covered_region(cmr); | |
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146 } |
0 | 147 |
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148 void PSOldGen::initialize_performance_counters(const char* perf_data_name, int level) { |
0 | 149 // Generation Counters, generation 'level', 1 subspace |
150 _gen_counters = new PSGenerationCounters(perf_data_name, level, 1, | |
151 virtual_space()); | |
152 _space_counters = new SpaceCounters(perf_data_name, 0, | |
153 virtual_space()->reserved_size(), | |
154 _object_space, _gen_counters); | |
155 } | |
156 | |
157 // Assume that the generation has been allocated if its | |
158 // reserved size is not 0. | |
159 bool PSOldGen::is_allocated() { | |
160 return virtual_space()->reserved_size() != 0; | |
161 } | |
162 | |
163 void PSOldGen::precompact() { | |
164 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
165 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
166 | |
167 // Reset start array first. | |
168 start_array()->reset(); | |
169 | |
170 object_mark_sweep()->precompact(); | |
171 | |
172 // Now compact the young gen | |
173 heap->young_gen()->precompact(); | |
174 } | |
175 | |
176 void PSOldGen::adjust_pointers() { | |
177 object_mark_sweep()->adjust_pointers(); | |
178 } | |
179 | |
180 void PSOldGen::compact() { | |
181 object_mark_sweep()->compact(ZapUnusedHeapArea); | |
182 } | |
183 | |
184 size_t PSOldGen::contiguous_available() const { | |
185 return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); | |
186 } | |
187 | |
188 // Allocation. We report all successful allocations to the size policy | |
189 // Note that the perm gen does not use this method, and should not! | |
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190 HeapWord* PSOldGen::allocate(size_t word_size) { |
0 | 191 assert_locked_or_safepoint(Heap_lock); |
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192 HeapWord* res = allocate_noexpand(word_size); |
0 | 193 |
194 if (res == NULL) { | |
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195 res = expand_and_allocate(word_size); |
0 | 196 } |
197 | |
198 // Allocations in the old generation need to be reported | |
199 if (res != NULL) { | |
200 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
201 heap->size_policy()->tenured_allocation(word_size); | |
202 } | |
203 | |
204 return res; | |
205 } | |
206 | |
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207 HeapWord* PSOldGen::expand_and_allocate(size_t word_size) { |
0 | 208 expand(word_size*HeapWordSize); |
209 if (GCExpandToAllocateDelayMillis > 0) { | |
210 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
211 } | |
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212 return allocate_noexpand(word_size); |
0 | 213 } |
214 | |
215 HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { | |
216 expand(word_size*HeapWordSize); | |
217 if (GCExpandToAllocateDelayMillis > 0) { | |
218 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
219 } | |
220 return cas_allocate_noexpand(word_size); | |
221 } | |
222 | |
223 void PSOldGen::expand(size_t bytes) { | |
271
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224 if (bytes == 0) { |
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225 return; |
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226 } |
0 | 227 MutexLocker x(ExpandHeap_lock); |
228 const size_t alignment = virtual_space()->alignment(); | |
229 size_t aligned_bytes = align_size_up(bytes, alignment); | |
230 size_t aligned_expand_bytes = align_size_up(MinHeapDeltaBytes, alignment); | |
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231 |
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232 if (UseNUMA) { |
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233 // With NUMA we use round-robin page allocation for the old gen. Expand by at least |
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234 // providing a page per lgroup. Alignment is larger or equal to the page size. |
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235 aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
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236 } |
271
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237 if (aligned_bytes == 0){ |
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238 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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239 // return true with the implication that and expansion was done when it |
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240 // was not. A call to expand implies a best effort to expand by "bytes" |
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241 // but not a guarantee. Align down to give a best effort. This is likely |
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242 // the most that the generation can expand since it has some capacity to |
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243 // start with. |
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244 aligned_bytes = align_size_down(bytes, alignment); |
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245 } |
0 | 246 |
247 bool success = false; | |
248 if (aligned_expand_bytes > aligned_bytes) { | |
249 success = expand_by(aligned_expand_bytes); | |
250 } | |
251 if (!success) { | |
252 success = expand_by(aligned_bytes); | |
253 } | |
254 if (!success) { | |
255 success = expand_to_reserved(); | |
256 } | |
257 | |
271
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258 if (PrintGC && Verbose) { |
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259 if (success && GC_locker::is_active_and_needs_gc()) { |
0 | 260 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
261 } | |
262 } | |
263 } | |
264 | |
265 bool PSOldGen::expand_by(size_t bytes) { | |
266 assert_lock_strong(ExpandHeap_lock); | |
267 assert_locked_or_safepoint(Heap_lock); | |
271
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268 if (bytes == 0) { |
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269 return true; // That's what virtual_space()->expand_by(0) would return |
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270 } |
0 | 271 bool result = virtual_space()->expand_by(bytes); |
272 if (result) { | |
263
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273 if (ZapUnusedHeapArea) { |
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274 // We need to mangle the newly expanded area. The memregion spans |
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275 // end -> new_end, we assume that top -> end is already mangled. |
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276 // Do the mangling before post_resize() is called because |
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277 // the space is available for allocation after post_resize(); |
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278 HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
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279 assert(object_space()->end() < virtual_space_high, |
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280 "Should be true before post_resize()"); |
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281 MemRegion mangle_region(object_space()->end(), virtual_space_high); |
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282 // Note that the object space has not yet been updated to |
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283 // coincede with the new underlying virtual space. |
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284 SpaceMangler::mangle_region(mangle_region); |
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285 } |
0 | 286 post_resize(); |
287 if (UsePerfData) { | |
288 _space_counters->update_capacity(); | |
289 _gen_counters->update_all(); | |
290 } | |
291 } | |
292 | |
293 if (result && Verbose && PrintGC) { | |
294 size_t new_mem_size = virtual_space()->committed_size(); | |
295 size_t old_mem_size = new_mem_size - bytes; | |
296 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
297 SIZE_FORMAT "K to " | |
298 SIZE_FORMAT "K", | |
299 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
300 } | |
301 | |
302 return result; | |
303 } | |
304 | |
305 bool PSOldGen::expand_to_reserved() { | |
306 assert_lock_strong(ExpandHeap_lock); | |
307 assert_locked_or_safepoint(Heap_lock); | |
308 | |
309 bool result = true; | |
310 const size_t remaining_bytes = virtual_space()->uncommitted_size(); | |
311 if (remaining_bytes > 0) { | |
312 result = expand_by(remaining_bytes); | |
313 DEBUG_ONLY(if (!result) warning("grow to reserve failed")); | |
314 } | |
315 return result; | |
316 } | |
317 | |
318 void PSOldGen::shrink(size_t bytes) { | |
319 assert_lock_strong(ExpandHeap_lock); | |
320 assert_locked_or_safepoint(Heap_lock); | |
321 | |
322 size_t size = align_size_down(bytes, virtual_space()->alignment()); | |
323 if (size > 0) { | |
324 assert_lock_strong(ExpandHeap_lock); | |
325 virtual_space()->shrink_by(bytes); | |
326 post_resize(); | |
327 | |
328 if (Verbose && PrintGC) { | |
329 size_t new_mem_size = virtual_space()->committed_size(); | |
330 size_t old_mem_size = new_mem_size + bytes; | |
331 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by " | |
332 SIZE_FORMAT "K to " | |
333 SIZE_FORMAT "K", | |
334 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
335 } | |
336 } | |
337 } | |
338 | |
339 void PSOldGen::resize(size_t desired_free_space) { | |
340 const size_t alignment = virtual_space()->alignment(); | |
341 const size_t size_before = virtual_space()->committed_size(); | |
342 size_t new_size = used_in_bytes() + desired_free_space; | |
343 if (new_size < used_in_bytes()) { | |
344 // Overflowed the addition. | |
345 new_size = gen_size_limit(); | |
346 } | |
347 // Adjust according to our min and max | |
348 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); | |
349 | |
350 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); | |
351 new_size = align_size_up(new_size, alignment); | |
352 | |
353 const size_t current_size = capacity_in_bytes(); | |
354 | |
355 if (PrintAdaptiveSizePolicy && Verbose) { | |
356 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
357 "desired free: " SIZE_FORMAT " used: " SIZE_FORMAT | |
358 " new size: " SIZE_FORMAT " current size " SIZE_FORMAT | |
359 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
360 desired_free_space, used_in_bytes(), new_size, current_size, | |
361 gen_size_limit(), min_gen_size()); | |
362 } | |
363 | |
364 if (new_size == current_size) { | |
365 // No change requested | |
366 return; | |
367 } | |
368 if (new_size > current_size) { | |
369 size_t change_bytes = new_size - current_size; | |
370 expand(change_bytes); | |
371 } else { | |
372 size_t change_bytes = current_size - new_size; | |
373 // shrink doesn't grab this lock, expand does. Is that right? | |
374 MutexLocker x(ExpandHeap_lock); | |
375 shrink(change_bytes); | |
376 } | |
377 | |
378 if (PrintAdaptiveSizePolicy) { | |
379 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
380 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
381 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
382 "collection: %d " | |
383 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
384 heap->total_collections(), | |
385 size_before, virtual_space()->committed_size()); | |
386 } | |
387 } | |
388 | |
389 // NOTE! We need to be careful about resizing. During a GC, multiple | |
390 // allocators may be active during heap expansion. If we allow the | |
391 // heap resizing to become visible before we have correctly resized | |
392 // all heap related data structures, we may cause program failures. | |
393 void PSOldGen::post_resize() { | |
394 // First construct a memregion representing the new size | |
395 MemRegion new_memregion((HeapWord*)virtual_space()->low(), | |
396 (HeapWord*)virtual_space()->high()); | |
397 size_t new_word_size = new_memregion.word_size(); | |
398 | |
399 start_array()->set_covered_region(new_memregion); | |
400 Universe::heap()->barrier_set()->resize_covered_region(new_memregion); | |
401 | |
402 // ALWAYS do this last!! | |
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403 object_space()->initialize(new_memregion, |
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404 SpaceDecorator::DontClear, |
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405 SpaceDecorator::DontMangle); |
0 | 406 |
407 assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), | |
408 "Sanity"); | |
409 } | |
410 | |
411 size_t PSOldGen::gen_size_limit() { | |
412 return _max_gen_size; | |
413 } | |
414 | |
415 void PSOldGen::reset_after_change() { | |
416 ShouldNotReachHere(); | |
417 return; | |
418 } | |
419 | |
420 size_t PSOldGen::available_for_expansion() { | |
421 ShouldNotReachHere(); | |
422 return 0; | |
423 } | |
424 | |
425 size_t PSOldGen::available_for_contraction() { | |
426 ShouldNotReachHere(); | |
427 return 0; | |
428 } | |
429 | |
430 void PSOldGen::print() const { print_on(tty);} | |
431 void PSOldGen::print_on(outputStream* st) const { | |
432 st->print(" %-15s", name()); | |
433 if (PrintGCDetails && Verbose) { | |
434 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
435 capacity_in_bytes(), used_in_bytes()); | |
436 } else { | |
437 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
438 capacity_in_bytes()/K, used_in_bytes()/K); | |
439 } | |
440 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
441 virtual_space()->low_boundary(), | |
442 virtual_space()->high(), | |
443 virtual_space()->high_boundary()); | |
444 | |
445 st->print(" object"); object_space()->print_on(st); | |
446 } | |
447 | |
448 void PSOldGen::print_used_change(size_t prev_used) const { | |
449 gclog_or_tty->print(" [%s:", name()); | |
450 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
451 "->" SIZE_FORMAT "K" | |
452 "(" SIZE_FORMAT "K)", | |
453 prev_used / K, used_in_bytes() / K, | |
454 capacity_in_bytes() / K); | |
455 gclog_or_tty->print("]"); | |
456 } | |
457 | |
458 void PSOldGen::update_counters() { | |
459 if (UsePerfData) { | |
460 _space_counters->update_all(); | |
461 _gen_counters->update_all(); | |
462 } | |
463 } | |
464 | |
465 #ifndef PRODUCT | |
466 | |
467 void PSOldGen::space_invariants() { | |
468 assert(object_space()->end() == (HeapWord*) virtual_space()->high(), | |
469 "Space invariant"); | |
470 assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), | |
471 "Space invariant"); | |
472 assert(virtual_space()->low_boundary() <= virtual_space()->low(), | |
473 "Space invariant"); | |
474 assert(virtual_space()->high_boundary() >= virtual_space()->high(), | |
475 "Space invariant"); | |
476 assert(virtual_space()->low_boundary() == (char*) _reserved.start(), | |
477 "Space invariant"); | |
478 assert(virtual_space()->high_boundary() == (char*) _reserved.end(), | |
479 "Space invariant"); | |
480 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
481 "Space invariant"); | |
482 } | |
483 #endif | |
484 | |
6008 | 485 void PSOldGen::verify() { |
486 object_space()->verify(); | |
0 | 487 } |
488 class VerifyObjectStartArrayClosure : public ObjectClosure { | |
489 PSOldGen* _gen; | |
490 ObjectStartArray* _start_array; | |
491 | |
492 public: | |
493 VerifyObjectStartArrayClosure(PSOldGen* gen, ObjectStartArray* start_array) : | |
494 _gen(gen), _start_array(start_array) { } | |
495 | |
496 virtual void do_object(oop obj) { | |
497 HeapWord* test_addr = (HeapWord*)obj + 1; | |
498 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); | |
499 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); | |
500 } | |
501 }; | |
502 | |
503 void PSOldGen::verify_object_start_array() { | |
504 VerifyObjectStartArrayClosure check( this, &_start_array ); | |
505 object_iterate(&check); | |
506 } | |
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507 |
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508 #ifndef PRODUCT |
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509 void PSOldGen::record_spaces_top() { |
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510 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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511 object_space()->set_top_for_allocations(); |
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512 } |
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513 #endif |