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annotate src/share/vm/gc_interface/collectedHeap.cpp @ 3500:6111c168756f
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 08 Aug 2011 15:19:09 +0200 |
parents | 1d1603768966 |
children | 7f776886a215 baf763f388e6 |
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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 { | |
160 // ...and clear just the allocated object. | |
161 Copy::zero_to_words(obj, size); | |
162 } | |
163 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
164 return obj; | |
165 } | |
166 | |
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167 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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168 MemRegion deferred = thread->deferred_card_mark(); |
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169 if (!deferred.is_empty()) { |
1166 | 170 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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171 { |
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172 // Verify that the storage points to a parsable object in heap |
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173 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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174 assert(is_in(old_obj), "Not in allocated heap"); |
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175 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 176 "Else should have been filtered in new_store_pre_barrier()"); |
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177 assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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178 assert(old_obj->is_oop(true), "Not an oop"); |
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179 assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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180 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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181 "Mismatch: multiple objects?"); |
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182 } |
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183 BarrierSet* bs = barrier_set(); |
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184 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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185 bs->write_region(deferred); |
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186 // "Clear" the deferred_card_mark field |
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187 thread->set_deferred_card_mark(MemRegion()); |
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188 } |
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189 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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190 } |
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191 |
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192 // Helper for ReduceInitialCardMarks. For performance, |
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193 // compiled code may elide card-marks for initializing stores |
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194 // to a newly allocated object along the fast-path. We |
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195 // compensate for such elided card-marks as follows: |
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196 // (a) Generational, non-concurrent collectors, such as |
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197 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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198 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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199 // need the card-mark if and only if the region is |
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200 // in the old gen, and do not care if the card-mark |
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201 // succeeds or precedes the initializing stores themselves, |
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202 // so long as the card-mark is completed before the next |
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203 // scavenge. For all these cases, we can do a card mark |
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204 // at the point at which we do a slow path allocation |
1166 | 205 // in the old gen, i.e. in this call. |
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206 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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207 // in addition that the card-mark for an old gen allocated |
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208 // object strictly follow any associated initializing stores. |
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209 // In these cases, the memRegion remembered below is |
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210 // used to card-mark the entire region either just before the next |
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211 // slow-path allocation by this thread or just before the next scavenge or |
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212 // CMS-associated safepoint, whichever of these events happens first. |
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213 // (The implicit assumption is that the object has been fully |
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214 // initialized by this point, a fact that we assert when doing the |
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215 // card-mark.) |
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216 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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217 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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218 // is used to remember the pre-value of any store. Initializing |
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219 // stores will not need this barrier, so we need not worry about |
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220 // compensating for the missing pre-barrier here. Turning now |
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221 // to the post-barrier, we note that G1 needs a RS update barrier |
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222 // which simply enqueues a (sequence of) dirty cards which may |
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223 // optionally be refined by the concurrent update threads. Note |
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224 // that this barrier need only be applied to a non-young write, |
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225 // but, like in CMS, because of the presence of concurrent refinement |
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226 // (much like CMS' precleaning), must strictly follow the oop-store. |
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227 // Thus, using the same protocol for maintaining the intended |
1166 | 228 // invariants turns out, serendepitously, to be the same for both |
229 // G1 and CMS. | |
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230 // |
1166 | 231 // For any future collector, this code should be reexamined with |
232 // that specific collector in mind, and the documentation above suitably | |
233 // extended and updated. | |
234 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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235 // If a previous card-mark was deferred, flush it now. |
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236 flush_deferred_store_barrier(thread); |
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237 if (can_elide_initializing_store_barrier(new_obj)) { |
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238 // The deferred_card_mark region should be empty |
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239 // following the flush above. |
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240 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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241 } else { |
1166 | 242 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
243 assert(!mr.is_empty(), "Error"); | |
244 if (_defer_initial_card_mark) { | |
245 // Defer the card mark | |
246 thread->set_deferred_card_mark(mr); | |
247 } else { | |
248 // Do the card mark | |
249 BarrierSet* bs = barrier_set(); | |
250 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
251 bs->write_region(mr); | |
252 } | |
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253 } |
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254 return new_obj; |
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255 } |
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256 |
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257 size_t CollectedHeap::filler_array_hdr_size() { |
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258 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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259 } |
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260 |
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261 size_t CollectedHeap::filler_array_min_size() { |
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262 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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263 } |
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264 |
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265 size_t CollectedHeap::filler_array_max_size() { |
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266 return _filler_array_max_size; |
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267 } |
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268 |
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269 #ifdef ASSERT |
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270 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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271 { |
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272 assert(words >= min_fill_size(), "too small to fill"); |
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273 assert(words % MinObjAlignment == 0, "unaligned size"); |
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274 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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275 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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276 } |
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277 |
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278 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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279 { |
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280 if (ZapFillerObjects && zap) { |
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281 Copy::fill_to_words(start + filler_array_hdr_size(), |
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282 words - filler_array_hdr_size(), 0XDEAFBABE); |
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283 } |
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284 } |
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285 #endif // ASSERT |
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286 |
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287 void |
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288 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
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289 { |
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290 assert(words >= filler_array_min_size(), "too small for an array"); |
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291 assert(words <= filler_array_max_size(), "too big for a single object"); |
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292 |
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293 const size_t payload_size = words - filler_array_hdr_size(); |
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294 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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295 |
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296 // Set the length first for concurrent GC. |
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297 ((arrayOop)start)->set_length((int)len); |
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298 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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299 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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300 } |
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301 |
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302 void |
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303 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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304 { |
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305 assert(words <= filler_array_max_size(), "too big for a single object"); |
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306 |
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307 if (words >= filler_array_min_size()) { |
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308 fill_with_array(start, words, zap); |
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309 } else if (words > 0) { |
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310 assert(words == min_fill_size(), "unaligned size"); |
1142 | 311 post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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312 words); |
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313 } |
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314 } |
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315 |
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316 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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317 { |
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318 DEBUG_ONLY(fill_args_check(start, words);) |
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319 HandleMark hm; // Free handles before leaving. |
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320 fill_with_object_impl(start, words, zap); |
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321 } |
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322 |
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323 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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324 { |
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325 DEBUG_ONLY(fill_args_check(start, words);) |
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326 HandleMark hm; // Free handles before leaving. |
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327 |
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328 #ifdef _LP64 |
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329 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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330 // First fill with arrays, ensuring that any remaining space is big enough to |
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331 // fill. The remainder is filled with a single object. |
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332 const size_t min = min_fill_size(); |
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333 const size_t max = filler_array_max_size(); |
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334 while (words > max) { |
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335 const size_t cur = words - max >= min ? max : max - min; |
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336 fill_with_array(start, cur, zap); |
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337 start += cur; |
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338 words -= cur; |
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339 } |
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340 #endif |
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341 |
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342 fill_with_object_impl(start, words, zap); |
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343 } |
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344 |
0 | 345 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
346 guarantee(false, "thread-local allocation buffers not supported"); | |
347 return NULL; | |
348 } | |
349 | |
350 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
351 // The second disjunct in the assertion below makes a concession | |
352 // for the start-up verification done while the VM is being | |
353 // created. Callers be careful that you know that mutators | |
354 // aren't going to interfere -- for instance, this is permissible | |
355 // if we are still single-threaded and have either not yet | |
356 // started allocating (nothing much to verify) or we have | |
357 // started allocating but are now a full-fledged JavaThread | |
358 // (and have thus made our TLAB's) available for filling. | |
359 assert(SafepointSynchronize::is_at_safepoint() || | |
360 !is_init_completed(), | |
361 "Should only be called at a safepoint or at start-up" | |
362 " otherwise concurrent mutator activity may make heap " | |
363 " unparsable again"); | |
1166 | 364 const bool use_tlab = UseTLAB; |
365 const bool deferred = _defer_initial_card_mark; | |
366 // The main thread starts allocating via a TLAB even before it | |
367 // has added itself to the threads list at vm boot-up. | |
368 assert(!use_tlab || Threads::first() != NULL, | |
369 "Attempt to fill tlabs before main thread has been added" | |
370 " to threads list is doomed to failure!"); | |
371 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
372 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
373 #ifdef COMPILER2 | |
374 // The deferred store barriers must all have been flushed to the | |
375 // card-table (or other remembered set structure) before GC starts | |
376 // processing the card-table (or other remembered set). | |
377 if (deferred) flush_deferred_store_barrier(thread); | |
378 #else | |
379 assert(!deferred, "Should be false"); | |
380 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
381 #endif | |
0 | 382 } |
383 } | |
384 | |
385 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
386 if (UseTLAB) { | |
387 assert(SafepointSynchronize::is_at_safepoint() || | |
388 !is_init_completed(), | |
389 "should only accumulate statistics on tlabs at safepoint"); | |
390 | |
391 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
392 } | |
393 } | |
394 | |
395 void CollectedHeap::resize_all_tlabs() { | |
396 if (UseTLAB) { | |
397 assert(SafepointSynchronize::is_at_safepoint() || | |
398 !is_init_completed(), | |
399 "should only resize tlabs at safepoint"); | |
400 | |
401 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
402 } | |
403 } | |
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404 |
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405 void CollectedHeap::pre_full_gc_dump() { |
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406 if (HeapDumpBeforeFullGC) { |
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407 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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408 // We are doing a "major" collection and a heap dump before |
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409 // major collection has been requested. |
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410 HeapDumper::dump_heap(); |
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411 } |
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412 if (PrintClassHistogramBeforeFullGC) { |
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413 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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414 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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415 inspector.doit(); |
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416 } |
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417 } |
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418 |
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419 void CollectedHeap::post_full_gc_dump() { |
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420 if (HeapDumpAfterFullGC) { |
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421 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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422 HeapDumper::dump_heap(); |
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423 } |
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424 if (PrintClassHistogramAfterFullGC) { |
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425 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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426 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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427 inspector.doit(); |
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428 } |
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429 } |