Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/psOldGen.cpp @ 5964:21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
Summary: Make two G1 cmd line flags available in product builds: G1HeapWastePercent (previously called: G1OldReclaimableThresholdPercent) and G1MixedGCCountTarget (previous called: G1MaxMixedGCNum). Also changed the default of the former from 1% to 5% and the default for G1OldCSetRegionLiveThresholdPercent to 90%.
Reviewed-by: azeemj, jwilhelm, johnc
author | tonyp |
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date | Fri, 23 Mar 2012 10:53:19 -0400 |
parents | c9ca3f51cf41 |
children | b632e80fc9dc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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); | |
60 // The old gen can grow to gen_size_limit(). _reserve reflects only | |
61 // the current maximum that can be committed. | |
62 assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); | |
63 } | |
64 | |
65 void PSOldGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { | |
66 | |
67 _virtual_space = new PSVirtualSpace(rs, alignment); | |
68 if (!_virtual_space->expand_by(_init_gen_size)) { | |
69 vm_exit_during_initialization("Could not reserve enough space for " | |
70 "object heap"); | |
71 } | |
72 } | |
73 | |
74 void PSOldGen::initialize_work(const char* perf_data_name, int level) { | |
75 // | |
76 // Basic memory initialization | |
77 // | |
78 | |
79 MemRegion limit_reserved((HeapWord*)virtual_space()->low_boundary(), | |
80 heap_word_size(_max_gen_size)); | |
81 assert(limit_reserved.byte_size() == _max_gen_size, | |
82 "word vs bytes confusion"); | |
83 // | |
84 // Object start stuff | |
85 // | |
86 | |
87 start_array()->initialize(limit_reserved); | |
88 | |
89 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
90 (HeapWord*)virtual_space()->high_boundary()); | |
91 | |
92 // | |
93 // Card table stuff | |
94 // | |
95 | |
96 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
97 (HeapWord*)virtual_space()->high()); | |
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98 if (ZapUnusedHeapArea) { |
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99 // Mangle newly committed space immediately rather than |
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100 // waiting for the initialization of the space even though |
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101 // mangling is related to spaces. Doing it here eliminates |
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102 // the need to carry along information that a complete mangling |
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103 // (bottom to end) needs to be done. |
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104 SpaceMangler::mangle_region(cmr); |
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105 } |
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106 |
0 | 107 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
108 | |
109 CardTableModRefBS* _ct = (CardTableModRefBS*)Universe::heap()->barrier_set(); | |
110 assert (_ct->kind() == BarrierSet::CardTableModRef, "Sanity"); | |
111 | |
112 // Verify that the start and end of this generation is the start of a card. | |
113 // If this wasn't true, a single card could span more than one generation, | |
114 // which would cause problems when we commit/uncommit memory, and when we | |
115 // clear and dirty cards. | |
116 guarantee(_ct->is_card_aligned(_reserved.start()), "generation must be card aligned"); | |
117 if (_reserved.end() != Universe::heap()->reserved_region().end()) { | |
118 // Don't check at the very end of the heap as we'll assert that we're probing off | |
119 // the end if we try. | |
120 guarantee(_ct->is_card_aligned(_reserved.end()), "generation must be card aligned"); | |
121 } | |
122 | |
123 // | |
124 // ObjectSpace stuff | |
125 // | |
126 | |
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127 _object_space = new MutableSpace(virtual_space()->alignment()); |
0 | 128 |
129 if (_object_space == NULL) | |
130 vm_exit_during_initialization("Could not allocate an old gen space"); | |
131 | |
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132 object_space()->initialize(cmr, |
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133 SpaceDecorator::Clear, |
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134 SpaceDecorator::Mangle); |
0 | 135 |
136 _object_mark_sweep = new PSMarkSweepDecorator(_object_space, start_array(), MarkSweepDeadRatio); | |
137 | |
138 if (_object_mark_sweep == NULL) | |
139 vm_exit_during_initialization("Could not complete allocation of old generation"); | |
140 | |
141 // Update the start_array | |
142 start_array()->set_covered_region(cmr); | |
143 | |
144 // Generation Counters, generation 'level', 1 subspace | |
145 _gen_counters = new PSGenerationCounters(perf_data_name, level, 1, | |
146 virtual_space()); | |
147 _space_counters = new SpaceCounters(perf_data_name, 0, | |
148 virtual_space()->reserved_size(), | |
149 _object_space, _gen_counters); | |
150 } | |
151 | |
152 // Assume that the generation has been allocated if its | |
153 // reserved size is not 0. | |
154 bool PSOldGen::is_allocated() { | |
155 return virtual_space()->reserved_size() != 0; | |
156 } | |
157 | |
158 void PSOldGen::precompact() { | |
159 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
160 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
161 | |
162 // Reset start array first. | |
163 start_array()->reset(); | |
164 | |
165 object_mark_sweep()->precompact(); | |
166 | |
167 // Now compact the young gen | |
168 heap->young_gen()->precompact(); | |
169 } | |
170 | |
171 void PSOldGen::adjust_pointers() { | |
172 object_mark_sweep()->adjust_pointers(); | |
173 } | |
174 | |
175 void PSOldGen::compact() { | |
176 object_mark_sweep()->compact(ZapUnusedHeapArea); | |
177 } | |
178 | |
179 size_t PSOldGen::contiguous_available() const { | |
180 return object_space()->free_in_bytes() + virtual_space()->uncommitted_size(); | |
181 } | |
182 | |
183 // Allocation. We report all successful allocations to the size policy | |
184 // Note that the perm gen does not use this method, and should not! | |
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185 HeapWord* PSOldGen::allocate(size_t word_size) { |
0 | 186 assert_locked_or_safepoint(Heap_lock); |
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187 HeapWord* res = allocate_noexpand(word_size); |
0 | 188 |
189 if (res == NULL) { | |
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190 res = expand_and_allocate(word_size); |
0 | 191 } |
192 | |
193 // Allocations in the old generation need to be reported | |
194 if (res != NULL) { | |
195 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
196 heap->size_policy()->tenured_allocation(word_size); | |
197 } | |
198 | |
199 return res; | |
200 } | |
201 | |
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202 HeapWord* PSOldGen::expand_and_allocate(size_t word_size) { |
0 | 203 expand(word_size*HeapWordSize); |
204 if (GCExpandToAllocateDelayMillis > 0) { | |
205 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
206 } | |
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207 return allocate_noexpand(word_size); |
0 | 208 } |
209 | |
210 HeapWord* PSOldGen::expand_and_cas_allocate(size_t word_size) { | |
211 expand(word_size*HeapWordSize); | |
212 if (GCExpandToAllocateDelayMillis > 0) { | |
213 os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false); | |
214 } | |
215 return cas_allocate_noexpand(word_size); | |
216 } | |
217 | |
218 void PSOldGen::expand(size_t bytes) { | |
271
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219 if (bytes == 0) { |
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220 return; |
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221 } |
0 | 222 MutexLocker x(ExpandHeap_lock); |
223 const size_t alignment = virtual_space()->alignment(); | |
224 size_t aligned_bytes = align_size_up(bytes, alignment); | |
225 size_t aligned_expand_bytes = align_size_up(MinHeapDeltaBytes, alignment); | |
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226 |
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227 if (UseNUMA) { |
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228 // With NUMA we use round-robin page allocation for the old gen. Expand by at least |
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229 // providing a page per lgroup. Alignment is larger or equal to the page size. |
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230 aligned_expand_bytes = MAX2(aligned_expand_bytes, alignment * os::numa_get_groups_num()); |
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231 } |
271
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232 if (aligned_bytes == 0){ |
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233 // The alignment caused the number of bytes to wrap. An expand_by(0) will |
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234 // return true with the implication that and expansion was done when it |
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235 // was not. A call to expand implies a best effort to expand by "bytes" |
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236 // but not a guarantee. Align down to give a best effort. This is likely |
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237 // the most that the generation can expand since it has some capacity to |
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238 // start with. |
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239 aligned_bytes = align_size_down(bytes, alignment); |
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240 } |
0 | 241 |
242 bool success = false; | |
243 if (aligned_expand_bytes > aligned_bytes) { | |
244 success = expand_by(aligned_expand_bytes); | |
245 } | |
246 if (!success) { | |
247 success = expand_by(aligned_bytes); | |
248 } | |
249 if (!success) { | |
250 success = expand_to_reserved(); | |
251 } | |
252 | |
271
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253 if (PrintGC && Verbose) { |
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254 if (success && GC_locker::is_active()) { |
0 | 255 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
256 } | |
257 } | |
258 } | |
259 | |
260 bool PSOldGen::expand_by(size_t bytes) { | |
261 assert_lock_strong(ExpandHeap_lock); | |
262 assert_locked_or_safepoint(Heap_lock); | |
271
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263 if (bytes == 0) { |
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264 return true; // That's what virtual_space()->expand_by(0) would return |
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265 } |
0 | 266 bool result = virtual_space()->expand_by(bytes); |
267 if (result) { | |
263
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268 if (ZapUnusedHeapArea) { |
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269 // We need to mangle the newly expanded area. The memregion spans |
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270 // end -> new_end, we assume that top -> end is already mangled. |
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271 // Do the mangling before post_resize() is called because |
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272 // the space is available for allocation after post_resize(); |
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273 HeapWord* const virtual_space_high = (HeapWord*) virtual_space()->high(); |
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274 assert(object_space()->end() < virtual_space_high, |
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275 "Should be true before post_resize()"); |
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276 MemRegion mangle_region(object_space()->end(), virtual_space_high); |
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277 // Note that the object space has not yet been updated to |
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278 // coincede with the new underlying virtual space. |
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279 SpaceMangler::mangle_region(mangle_region); |
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280 } |
0 | 281 post_resize(); |
282 if (UsePerfData) { | |
283 _space_counters->update_capacity(); | |
284 _gen_counters->update_all(); | |
285 } | |
286 } | |
287 | |
288 if (result && Verbose && PrintGC) { | |
289 size_t new_mem_size = virtual_space()->committed_size(); | |
290 size_t old_mem_size = new_mem_size - bytes; | |
291 gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " | |
292 SIZE_FORMAT "K to " | |
293 SIZE_FORMAT "K", | |
294 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
295 } | |
296 | |
297 return result; | |
298 } | |
299 | |
300 bool PSOldGen::expand_to_reserved() { | |
301 assert_lock_strong(ExpandHeap_lock); | |
302 assert_locked_or_safepoint(Heap_lock); | |
303 | |
304 bool result = true; | |
305 const size_t remaining_bytes = virtual_space()->uncommitted_size(); | |
306 if (remaining_bytes > 0) { | |
307 result = expand_by(remaining_bytes); | |
308 DEBUG_ONLY(if (!result) warning("grow to reserve failed")); | |
309 } | |
310 return result; | |
311 } | |
312 | |
313 void PSOldGen::shrink(size_t bytes) { | |
314 assert_lock_strong(ExpandHeap_lock); | |
315 assert_locked_or_safepoint(Heap_lock); | |
316 | |
317 size_t size = align_size_down(bytes, virtual_space()->alignment()); | |
318 if (size > 0) { | |
319 assert_lock_strong(ExpandHeap_lock); | |
320 virtual_space()->shrink_by(bytes); | |
321 post_resize(); | |
322 | |
323 if (Verbose && PrintGC) { | |
324 size_t new_mem_size = virtual_space()->committed_size(); | |
325 size_t old_mem_size = new_mem_size + bytes; | |
326 gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K by " | |
327 SIZE_FORMAT "K to " | |
328 SIZE_FORMAT "K", | |
329 name(), old_mem_size/K, bytes/K, new_mem_size/K); | |
330 } | |
331 } | |
332 } | |
333 | |
334 void PSOldGen::resize(size_t desired_free_space) { | |
335 const size_t alignment = virtual_space()->alignment(); | |
336 const size_t size_before = virtual_space()->committed_size(); | |
337 size_t new_size = used_in_bytes() + desired_free_space; | |
338 if (new_size < used_in_bytes()) { | |
339 // Overflowed the addition. | |
340 new_size = gen_size_limit(); | |
341 } | |
342 // Adjust according to our min and max | |
343 new_size = MAX2(MIN2(new_size, gen_size_limit()), min_gen_size()); | |
344 | |
345 assert(gen_size_limit() >= reserved().byte_size(), "max new size problem?"); | |
346 new_size = align_size_up(new_size, alignment); | |
347 | |
348 const size_t current_size = capacity_in_bytes(); | |
349 | |
350 if (PrintAdaptiveSizePolicy && Verbose) { | |
351 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
352 "desired free: " SIZE_FORMAT " used: " SIZE_FORMAT | |
353 " new size: " SIZE_FORMAT " current size " SIZE_FORMAT | |
354 " gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, | |
355 desired_free_space, used_in_bytes(), new_size, current_size, | |
356 gen_size_limit(), min_gen_size()); | |
357 } | |
358 | |
359 if (new_size == current_size) { | |
360 // No change requested | |
361 return; | |
362 } | |
363 if (new_size > current_size) { | |
364 size_t change_bytes = new_size - current_size; | |
365 expand(change_bytes); | |
366 } else { | |
367 size_t change_bytes = current_size - new_size; | |
368 // shrink doesn't grab this lock, expand does. Is that right? | |
369 MutexLocker x(ExpandHeap_lock); | |
370 shrink(change_bytes); | |
371 } | |
372 | |
373 if (PrintAdaptiveSizePolicy) { | |
374 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
375 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
376 gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: " | |
377 "collection: %d " | |
378 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
379 heap->total_collections(), | |
380 size_before, virtual_space()->committed_size()); | |
381 } | |
382 } | |
383 | |
384 // NOTE! We need to be careful about resizing. During a GC, multiple | |
385 // allocators may be active during heap expansion. If we allow the | |
386 // heap resizing to become visible before we have correctly resized | |
387 // all heap related data structures, we may cause program failures. | |
388 void PSOldGen::post_resize() { | |
389 // First construct a memregion representing the new size | |
390 MemRegion new_memregion((HeapWord*)virtual_space()->low(), | |
391 (HeapWord*)virtual_space()->high()); | |
392 size_t new_word_size = new_memregion.word_size(); | |
393 | |
394 start_array()->set_covered_region(new_memregion); | |
395 Universe::heap()->barrier_set()->resize_covered_region(new_memregion); | |
396 | |
397 // ALWAYS do this last!! | |
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398 object_space()->initialize(new_memregion, |
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399 SpaceDecorator::DontClear, |
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400 SpaceDecorator::DontMangle); |
0 | 401 |
402 assert(new_word_size == heap_word_size(object_space()->capacity_in_bytes()), | |
403 "Sanity"); | |
404 } | |
405 | |
406 size_t PSOldGen::gen_size_limit() { | |
407 return _max_gen_size; | |
408 } | |
409 | |
410 void PSOldGen::reset_after_change() { | |
411 ShouldNotReachHere(); | |
412 return; | |
413 } | |
414 | |
415 size_t PSOldGen::available_for_expansion() { | |
416 ShouldNotReachHere(); | |
417 return 0; | |
418 } | |
419 | |
420 size_t PSOldGen::available_for_contraction() { | |
421 ShouldNotReachHere(); | |
422 return 0; | |
423 } | |
424 | |
425 void PSOldGen::print() const { print_on(tty);} | |
426 void PSOldGen::print_on(outputStream* st) const { | |
427 st->print(" %-15s", name()); | |
428 if (PrintGCDetails && Verbose) { | |
429 st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, | |
430 capacity_in_bytes(), used_in_bytes()); | |
431 } else { | |
432 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", | |
433 capacity_in_bytes()/K, used_in_bytes()/K); | |
434 } | |
435 st->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
436 virtual_space()->low_boundary(), | |
437 virtual_space()->high(), | |
438 virtual_space()->high_boundary()); | |
439 | |
440 st->print(" object"); object_space()->print_on(st); | |
441 } | |
442 | |
443 void PSOldGen::print_used_change(size_t prev_used) const { | |
444 gclog_or_tty->print(" [%s:", name()); | |
445 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
446 "->" SIZE_FORMAT "K" | |
447 "(" SIZE_FORMAT "K)", | |
448 prev_used / K, used_in_bytes() / K, | |
449 capacity_in_bytes() / K); | |
450 gclog_or_tty->print("]"); | |
451 } | |
452 | |
453 void PSOldGen::update_counters() { | |
454 if (UsePerfData) { | |
455 _space_counters->update_all(); | |
456 _gen_counters->update_all(); | |
457 } | |
458 } | |
459 | |
460 #ifndef PRODUCT | |
461 | |
462 void PSOldGen::space_invariants() { | |
463 assert(object_space()->end() == (HeapWord*) virtual_space()->high(), | |
464 "Space invariant"); | |
465 assert(object_space()->bottom() == (HeapWord*) virtual_space()->low(), | |
466 "Space invariant"); | |
467 assert(virtual_space()->low_boundary() <= virtual_space()->low(), | |
468 "Space invariant"); | |
469 assert(virtual_space()->high_boundary() >= virtual_space()->high(), | |
470 "Space invariant"); | |
471 assert(virtual_space()->low_boundary() == (char*) _reserved.start(), | |
472 "Space invariant"); | |
473 assert(virtual_space()->high_boundary() == (char*) _reserved.end(), | |
474 "Space invariant"); | |
475 assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), | |
476 "Space invariant"); | |
477 } | |
478 #endif | |
479 | |
480 void PSOldGen::verify(bool allow_dirty) { | |
481 object_space()->verify(allow_dirty); | |
482 } | |
483 class VerifyObjectStartArrayClosure : public ObjectClosure { | |
484 PSOldGen* _gen; | |
485 ObjectStartArray* _start_array; | |
486 | |
487 public: | |
488 VerifyObjectStartArrayClosure(PSOldGen* gen, ObjectStartArray* start_array) : | |
489 _gen(gen), _start_array(start_array) { } | |
490 | |
491 virtual void do_object(oop obj) { | |
492 HeapWord* test_addr = (HeapWord*)obj + 1; | |
493 guarantee(_start_array->object_start(test_addr) == (HeapWord*)obj, "ObjectStartArray cannot find start of object"); | |
494 guarantee(_start_array->is_block_allocated((HeapWord*)obj), "ObjectStartArray missing block allocation"); | |
495 } | |
496 }; | |
497 | |
498 void PSOldGen::verify_object_start_array() { | |
499 VerifyObjectStartArrayClosure check( this, &_start_array ); | |
500 object_iterate(&check); | |
501 } | |
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502 |
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503 #ifndef PRODUCT |
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504 void PSOldGen::record_spaces_top() { |
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505 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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506 object_space()->set_top_for_allocations(); |
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507 } |
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508 #endif |