Mercurial > hg > graal-compiler
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 3892:baf763f388e6
7059037: Use BIS for zeroing on T4
Summary: Use BIS for zeroing new allocated big (2Kb and more) objects and arrays.
Reviewed-by: never, twisti, ysr
author | kvn |
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date | Fri, 26 Aug 2011 08:52:22 -0700 |
parents | 1d1603768966 |
children | d968f546734e |
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 "classfile/systemDictionary.hpp" | |
27 #include "gc_implementation/shared/vmGCOperations.hpp" | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "oops/oop.inline.hpp" | |
31 #include "runtime/init.hpp" | |
32 #include "services/heapDumper.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "thread_linux.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_solaris | |
37 # include "thread_solaris.inline.hpp" | |
38 #endif | |
39 #ifdef TARGET_OS_FAMILY_windows | |
40 # include "thread_windows.inline.hpp" | |
41 #endif | |
0 | 42 |
43 | |
44 #ifdef ASSERT | |
45 int CollectedHeap::_fire_out_of_memory_count = 0; | |
46 #endif | |
47 | |
481
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48 size_t CollectedHeap::_filler_array_max_size = 0; |
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49 |
0 | 50 // Memory state functions. |
51 | |
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52 |
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53 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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54 |
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55 { |
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56 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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57 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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58 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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59 max_len * elements_per_word); |
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60 |
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61 _barrier_set = NULL; |
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62 _is_gc_active = false; |
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63 _total_collections = _total_full_collections = 0; |
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64 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 65 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
66 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
67 | |
68 if (UsePerfData) { | |
69 EXCEPTION_MARK; | |
70 | |
71 // create the gc cause jvmstat counters | |
72 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
73 80, GCCause::to_string(_gc_cause), CHECK); | |
74 | |
75 _perf_gc_lastcause = | |
76 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
77 80, GCCause::to_string(_gc_lastcause), CHECK); | |
78 } | |
1166 | 79 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
0 | 80 } |
81 | |
1166 | 82 void CollectedHeap::pre_initialize() { |
83 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
84 // otherwise remains unused. | |
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85 #ifdef COMPILER2 |
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86 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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87 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 88 #else |
89 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
90 #endif | |
91 } | |
0 | 92 |
93 #ifndef PRODUCT | |
94 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
95 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
96 for (size_t slot = 0; slot < size; slot += 1) { | |
97 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
98 "Found badHeapWordValue in post-allocation check"); | |
99 } | |
100 } | |
101 } | |
102 | |
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103 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 104 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
105 for (size_t slot = 0; slot < size; slot += 1) { | |
106 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
107 "Found non badHeapWordValue in pre-allocation check"); | |
108 } | |
109 } | |
110 } | |
111 #endif // PRODUCT | |
112 | |
113 #ifdef ASSERT | |
114 void CollectedHeap::check_for_valid_allocation_state() { | |
115 Thread *thread = Thread::current(); | |
116 // How to choose between a pending exception and a potential | |
117 // OutOfMemoryError? Don't allow pending exceptions. | |
118 // This is a VM policy failure, so how do we exhaustively test it? | |
119 assert(!thread->has_pending_exception(), | |
120 "shouldn't be allocating with pending exception"); | |
121 if (StrictSafepointChecks) { | |
122 assert(thread->allow_allocation(), | |
123 "Allocation done by thread for which allocation is blocked " | |
124 "by No_Allocation_Verifier!"); | |
125 // Allocation of an oop can always invoke a safepoint, | |
126 // hence, the true argument | |
127 thread->check_for_valid_safepoint_state(true); | |
128 } | |
129 } | |
130 #endif | |
131 | |
132 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
133 | |
134 // Retain tlab and allocate object in shared space if | |
135 // the amount free in the tlab is too large to discard. | |
136 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
137 thread->tlab().record_slow_allocation(size); | |
138 return NULL; | |
139 } | |
140 | |
141 // Discard tlab and allocate a new one. | |
142 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
143 size_t new_tlab_size = thread->tlab().compute_size(size); | |
144 | |
145 thread->tlab().clear_before_allocation(); | |
146 | |
147 if (new_tlab_size == 0) { | |
148 return NULL; | |
149 } | |
150 | |
151 // Allocate a new TLAB... | |
152 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
153 if (obj == NULL) { | |
154 return NULL; | |
155 } | |
156 if (ZeroTLAB) { | |
157 // ..and clear it. | |
158 Copy::zero_to_words(obj, new_tlab_size); | |
159 } else { | |
3892 | 160 // ...and zap just allocated object. |
161 #ifdef ASSERT | |
162 // Skip mangling the space corresponding to the object header to | |
163 // ensure that the returned space is not considered parsable by | |
164 // any concurrent GC thread. | |
165 size_t hdr_size = oopDesc::header_size(); | |
166 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
167 #endif // ASSERT | |
0 | 168 } |
169 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
170 return obj; | |
171 } | |
172 | |
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173 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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174 MemRegion deferred = thread->deferred_card_mark(); |
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175 if (!deferred.is_empty()) { |
1166 | 176 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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177 { |
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178 // Verify that the storage points to a parsable object in heap |
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179 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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180 assert(is_in(old_obj), "Not in allocated heap"); |
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181 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 182 "Else should have been filtered in new_store_pre_barrier()"); |
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183 assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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184 assert(old_obj->is_oop(true), "Not an oop"); |
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185 assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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186 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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187 "Mismatch: multiple objects?"); |
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188 } |
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189 BarrierSet* bs = barrier_set(); |
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190 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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191 bs->write_region(deferred); |
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192 // "Clear" the deferred_card_mark field |
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193 thread->set_deferred_card_mark(MemRegion()); |
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194 } |
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195 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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196 } |
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197 |
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198 // Helper for ReduceInitialCardMarks. For performance, |
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199 // compiled code may elide card-marks for initializing stores |
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200 // to a newly allocated object along the fast-path. We |
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201 // compensate for such elided card-marks as follows: |
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202 // (a) Generational, non-concurrent collectors, such as |
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203 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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204 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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205 // need the card-mark if and only if the region is |
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206 // in the old gen, and do not care if the card-mark |
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207 // succeeds or precedes the initializing stores themselves, |
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208 // so long as the card-mark is completed before the next |
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209 // scavenge. For all these cases, we can do a card mark |
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210 // at the point at which we do a slow path allocation |
1166 | 211 // in the old gen, i.e. in this call. |
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212 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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213 // in addition that the card-mark for an old gen allocated |
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214 // object strictly follow any associated initializing stores. |
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215 // In these cases, the memRegion remembered below is |
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216 // used to card-mark the entire region either just before the next |
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217 // slow-path allocation by this thread or just before the next scavenge or |
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218 // CMS-associated safepoint, whichever of these events happens first. |
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219 // (The implicit assumption is that the object has been fully |
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220 // initialized by this point, a fact that we assert when doing the |
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221 // card-mark.) |
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222 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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223 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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224 // is used to remember the pre-value of any store. Initializing |
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225 // stores will not need this barrier, so we need not worry about |
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226 // compensating for the missing pre-barrier here. Turning now |
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227 // to the post-barrier, we note that G1 needs a RS update barrier |
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228 // which simply enqueues a (sequence of) dirty cards which may |
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229 // optionally be refined by the concurrent update threads. Note |
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230 // that this barrier need only be applied to a non-young write, |
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231 // but, like in CMS, because of the presence of concurrent refinement |
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232 // (much like CMS' precleaning), must strictly follow the oop-store. |
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233 // Thus, using the same protocol for maintaining the intended |
1166 | 234 // invariants turns out, serendepitously, to be the same for both |
235 // G1 and CMS. | |
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236 // |
1166 | 237 // For any future collector, this code should be reexamined with |
238 // that specific collector in mind, and the documentation above suitably | |
239 // extended and updated. | |
240 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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241 // If a previous card-mark was deferred, flush it now. |
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242 flush_deferred_store_barrier(thread); |
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243 if (can_elide_initializing_store_barrier(new_obj)) { |
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244 // The deferred_card_mark region should be empty |
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245 // following the flush above. |
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246 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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247 } else { |
1166 | 248 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
249 assert(!mr.is_empty(), "Error"); | |
250 if (_defer_initial_card_mark) { | |
251 // Defer the card mark | |
252 thread->set_deferred_card_mark(mr); | |
253 } else { | |
254 // Do the card mark | |
255 BarrierSet* bs = barrier_set(); | |
256 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
257 bs->write_region(mr); | |
258 } | |
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259 } |
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260 return new_obj; |
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261 } |
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262 |
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263 size_t CollectedHeap::filler_array_hdr_size() { |
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264 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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265 } |
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266 |
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267 size_t CollectedHeap::filler_array_min_size() { |
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268 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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269 } |
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270 |
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271 size_t CollectedHeap::filler_array_max_size() { |
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272 return _filler_array_max_size; |
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273 } |
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274 |
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275 #ifdef ASSERT |
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276 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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277 { |
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278 assert(words >= min_fill_size(), "too small to fill"); |
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279 assert(words % MinObjAlignment == 0, "unaligned size"); |
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280 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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281 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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282 } |
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283 |
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284 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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285 { |
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286 if (ZapFillerObjects && zap) { |
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287 Copy::fill_to_words(start + filler_array_hdr_size(), |
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288 words - filler_array_hdr_size(), 0XDEAFBABE); |
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289 } |
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290 } |
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291 #endif // ASSERT |
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292 |
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293 void |
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294 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
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295 { |
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296 assert(words >= filler_array_min_size(), "too small for an array"); |
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297 assert(words <= filler_array_max_size(), "too big for a single object"); |
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298 |
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299 const size_t payload_size = words - filler_array_hdr_size(); |
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300 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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301 |
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302 // Set the length first for concurrent GC. |
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303 ((arrayOop)start)->set_length((int)len); |
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304 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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305 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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306 } |
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307 |
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308 void |
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309 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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310 { |
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311 assert(words <= filler_array_max_size(), "too big for a single object"); |
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312 |
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313 if (words >= filler_array_min_size()) { |
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314 fill_with_array(start, words, zap); |
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315 } else if (words > 0) { |
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316 assert(words == min_fill_size(), "unaligned size"); |
1142 | 317 post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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318 words); |
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319 } |
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320 } |
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321 |
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322 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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323 { |
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324 DEBUG_ONLY(fill_args_check(start, words);) |
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325 HandleMark hm; // Free handles before leaving. |
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326 fill_with_object_impl(start, words, zap); |
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327 } |
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328 |
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329 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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330 { |
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331 DEBUG_ONLY(fill_args_check(start, words);) |
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332 HandleMark hm; // Free handles before leaving. |
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333 |
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334 #ifdef _LP64 |
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335 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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336 // First fill with arrays, ensuring that any remaining space is big enough to |
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337 // fill. The remainder is filled with a single object. |
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338 const size_t min = min_fill_size(); |
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339 const size_t max = filler_array_max_size(); |
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340 while (words > max) { |
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341 const size_t cur = words - max >= min ? max : max - min; |
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342 fill_with_array(start, cur, zap); |
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343 start += cur; |
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344 words -= cur; |
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345 } |
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346 #endif |
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347 |
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348 fill_with_object_impl(start, words, zap); |
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349 } |
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350 |
0 | 351 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
352 guarantee(false, "thread-local allocation buffers not supported"); | |
353 return NULL; | |
354 } | |
355 | |
356 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
357 // The second disjunct in the assertion below makes a concession | |
358 // for the start-up verification done while the VM is being | |
359 // created. Callers be careful that you know that mutators | |
360 // aren't going to interfere -- for instance, this is permissible | |
361 // if we are still single-threaded and have either not yet | |
362 // started allocating (nothing much to verify) or we have | |
363 // started allocating but are now a full-fledged JavaThread | |
364 // (and have thus made our TLAB's) available for filling. | |
365 assert(SafepointSynchronize::is_at_safepoint() || | |
366 !is_init_completed(), | |
367 "Should only be called at a safepoint or at start-up" | |
368 " otherwise concurrent mutator activity may make heap " | |
369 " unparsable again"); | |
1166 | 370 const bool use_tlab = UseTLAB; |
371 const bool deferred = _defer_initial_card_mark; | |
372 // The main thread starts allocating via a TLAB even before it | |
373 // has added itself to the threads list at vm boot-up. | |
374 assert(!use_tlab || Threads::first() != NULL, | |
375 "Attempt to fill tlabs before main thread has been added" | |
376 " to threads list is doomed to failure!"); | |
377 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
378 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
379 #ifdef COMPILER2 | |
380 // The deferred store barriers must all have been flushed to the | |
381 // card-table (or other remembered set structure) before GC starts | |
382 // processing the card-table (or other remembered set). | |
383 if (deferred) flush_deferred_store_barrier(thread); | |
384 #else | |
385 assert(!deferred, "Should be false"); | |
386 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
387 #endif | |
0 | 388 } |
389 } | |
390 | |
391 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
392 if (UseTLAB) { | |
393 assert(SafepointSynchronize::is_at_safepoint() || | |
394 !is_init_completed(), | |
395 "should only accumulate statistics on tlabs at safepoint"); | |
396 | |
397 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
398 } | |
399 } | |
400 | |
401 void CollectedHeap::resize_all_tlabs() { | |
402 if (UseTLAB) { | |
403 assert(SafepointSynchronize::is_at_safepoint() || | |
404 !is_init_completed(), | |
405 "should only resize tlabs at safepoint"); | |
406 | |
407 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
408 } | |
409 } | |
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410 |
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411 void CollectedHeap::pre_full_gc_dump() { |
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412 if (HeapDumpBeforeFullGC) { |
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413 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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414 // We are doing a "major" collection and a heap dump before |
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415 // major collection has been requested. |
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416 HeapDumper::dump_heap(); |
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417 } |
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418 if (PrintClassHistogramBeforeFullGC) { |
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419 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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420 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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421 inspector.doit(); |
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422 } |
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423 } |
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424 |
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425 void CollectedHeap::post_full_gc_dump() { |
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426 if (HeapDumpAfterFullGC) { |
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427 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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428 HeapDumper::dump_heap(); |
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429 } |
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430 if (PrintClassHistogramAfterFullGC) { |
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431 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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432 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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433 inspector.doit(); |
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434 } |
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435 } |