Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 1838:8f6f7587d292
6988678: fatal error deadlock handling was unintentionally disabled
Reviewed-by: ysr
author | jcoomes |
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date | Thu, 30 Sep 2010 12:15:13 -0700 |
parents | 8b10f48633dc |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_collectedHeap.cpp.incl" | |
27 | |
28 | |
29 #ifdef ASSERT | |
30 int CollectedHeap::_fire_out_of_memory_count = 0; | |
31 #endif | |
32 | |
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33 size_t CollectedHeap::_filler_array_max_size = 0; |
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34 |
0 | 35 // Memory state functions. |
36 | |
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37 |
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38 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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39 |
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40 { |
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41 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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42 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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43 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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44 max_len * elements_per_word); |
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45 |
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46 _barrier_set = NULL; |
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47 _is_gc_active = false; |
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48 _total_collections = _total_full_collections = 0; |
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49 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 50 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
51 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
52 | |
53 if (UsePerfData) { | |
54 EXCEPTION_MARK; | |
55 | |
56 // create the gc cause jvmstat counters | |
57 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
58 80, GCCause::to_string(_gc_cause), CHECK); | |
59 | |
60 _perf_gc_lastcause = | |
61 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
62 80, GCCause::to_string(_gc_lastcause), CHECK); | |
63 } | |
1166 | 64 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
0 | 65 } |
66 | |
1166 | 67 void CollectedHeap::pre_initialize() { |
68 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
69 // otherwise remains unused. | |
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70 #ifdef COMPILER2 |
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71 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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72 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 73 #else |
74 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
75 #endif | |
76 } | |
0 | 77 |
78 #ifndef PRODUCT | |
79 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
80 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
81 for (size_t slot = 0; slot < size; slot += 1) { | |
82 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
83 "Found badHeapWordValue in post-allocation check"); | |
84 } | |
85 } | |
86 } | |
87 | |
88 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
89 { | |
90 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
91 for (size_t slot = 0; slot < size; slot += 1) { | |
92 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
93 "Found non badHeapWordValue in pre-allocation check"); | |
94 } | |
95 } | |
96 } | |
97 #endif // PRODUCT | |
98 | |
99 #ifdef ASSERT | |
100 void CollectedHeap::check_for_valid_allocation_state() { | |
101 Thread *thread = Thread::current(); | |
102 // How to choose between a pending exception and a potential | |
103 // OutOfMemoryError? Don't allow pending exceptions. | |
104 // This is a VM policy failure, so how do we exhaustively test it? | |
105 assert(!thread->has_pending_exception(), | |
106 "shouldn't be allocating with pending exception"); | |
107 if (StrictSafepointChecks) { | |
108 assert(thread->allow_allocation(), | |
109 "Allocation done by thread for which allocation is blocked " | |
110 "by No_Allocation_Verifier!"); | |
111 // Allocation of an oop can always invoke a safepoint, | |
112 // hence, the true argument | |
113 thread->check_for_valid_safepoint_state(true); | |
114 } | |
115 } | |
116 #endif | |
117 | |
118 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
119 | |
120 // Retain tlab and allocate object in shared space if | |
121 // the amount free in the tlab is too large to discard. | |
122 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
123 thread->tlab().record_slow_allocation(size); | |
124 return NULL; | |
125 } | |
126 | |
127 // Discard tlab and allocate a new one. | |
128 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
129 size_t new_tlab_size = thread->tlab().compute_size(size); | |
130 | |
131 thread->tlab().clear_before_allocation(); | |
132 | |
133 if (new_tlab_size == 0) { | |
134 return NULL; | |
135 } | |
136 | |
137 // Allocate a new TLAB... | |
138 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
139 if (obj == NULL) { | |
140 return NULL; | |
141 } | |
142 if (ZeroTLAB) { | |
143 // ..and clear it. | |
144 Copy::zero_to_words(obj, new_tlab_size); | |
145 } else { | |
146 // ...and clear just the allocated object. | |
147 Copy::zero_to_words(obj, size); | |
148 } | |
149 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
150 return obj; | |
151 } | |
152 | |
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153 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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154 MemRegion deferred = thread->deferred_card_mark(); |
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155 if (!deferred.is_empty()) { |
1166 | 156 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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157 { |
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158 // Verify that the storage points to a parsable object in heap |
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159 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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160 assert(is_in(old_obj), "Not in allocated heap"); |
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161 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 162 "Else should have been filtered in new_store_pre_barrier()"); |
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163 assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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164 assert(old_obj->is_oop(true), "Not an oop"); |
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165 assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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166 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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167 "Mismatch: multiple objects?"); |
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168 } |
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169 BarrierSet* bs = barrier_set(); |
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170 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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171 bs->write_region(deferred); |
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172 // "Clear" the deferred_card_mark field |
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173 thread->set_deferred_card_mark(MemRegion()); |
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174 } |
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175 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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176 } |
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177 |
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178 // Helper for ReduceInitialCardMarks. For performance, |
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179 // compiled code may elide card-marks for initializing stores |
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180 // to a newly allocated object along the fast-path. We |
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181 // compensate for such elided card-marks as follows: |
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182 // (a) Generational, non-concurrent collectors, such as |
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183 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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184 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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185 // need the card-mark if and only if the region is |
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186 // in the old gen, and do not care if the card-mark |
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187 // succeeds or precedes the initializing stores themselves, |
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188 // so long as the card-mark is completed before the next |
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189 // scavenge. For all these cases, we can do a card mark |
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190 // at the point at which we do a slow path allocation |
1166 | 191 // in the old gen, i.e. in this call. |
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192 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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193 // in addition that the card-mark for an old gen allocated |
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194 // object strictly follow any associated initializing stores. |
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195 // In these cases, the memRegion remembered below is |
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196 // used to card-mark the entire region either just before the next |
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197 // slow-path allocation by this thread or just before the next scavenge or |
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198 // CMS-associated safepoint, whichever of these events happens first. |
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199 // (The implicit assumption is that the object has been fully |
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200 // initialized by this point, a fact that we assert when doing the |
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201 // card-mark.) |
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202 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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203 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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204 // is used to remember the pre-value of any store. Initializing |
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205 // stores will not need this barrier, so we need not worry about |
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206 // compensating for the missing pre-barrier here. Turning now |
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207 // to the post-barrier, we note that G1 needs a RS update barrier |
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208 // which simply enqueues a (sequence of) dirty cards which may |
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209 // optionally be refined by the concurrent update threads. Note |
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210 // that this barrier need only be applied to a non-young write, |
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211 // but, like in CMS, because of the presence of concurrent refinement |
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212 // (much like CMS' precleaning), must strictly follow the oop-store. |
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213 // Thus, using the same protocol for maintaining the intended |
1166 | 214 // invariants turns out, serendepitously, to be the same for both |
215 // G1 and CMS. | |
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216 // |
1166 | 217 // For any future collector, this code should be reexamined with |
218 // that specific collector in mind, and the documentation above suitably | |
219 // extended and updated. | |
220 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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221 // If a previous card-mark was deferred, flush it now. |
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222 flush_deferred_store_barrier(thread); |
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223 if (can_elide_initializing_store_barrier(new_obj)) { |
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224 // The deferred_card_mark region should be empty |
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225 // following the flush above. |
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226 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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227 } else { |
1166 | 228 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
229 assert(!mr.is_empty(), "Error"); | |
230 if (_defer_initial_card_mark) { | |
231 // Defer the card mark | |
232 thread->set_deferred_card_mark(mr); | |
233 } else { | |
234 // Do the card mark | |
235 BarrierSet* bs = barrier_set(); | |
236 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
237 bs->write_region(mr); | |
238 } | |
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239 } |
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240 return new_obj; |
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241 } |
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242 |
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243 size_t CollectedHeap::filler_array_hdr_size() { |
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244 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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245 } |
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246 |
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247 size_t CollectedHeap::filler_array_min_size() { |
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248 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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249 } |
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250 |
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251 size_t CollectedHeap::filler_array_max_size() { |
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252 return _filler_array_max_size; |
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253 } |
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254 |
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255 #ifdef ASSERT |
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256 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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257 { |
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258 assert(words >= min_fill_size(), "too small to fill"); |
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259 assert(words % MinObjAlignment == 0, "unaligned size"); |
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260 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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261 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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262 } |
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263 |
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264 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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265 { |
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266 if (ZapFillerObjects && zap) { |
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267 Copy::fill_to_words(start + filler_array_hdr_size(), |
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268 words - filler_array_hdr_size(), 0XDEAFBABE); |
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269 } |
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270 } |
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271 #endif // ASSERT |
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272 |
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273 void |
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274 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
481
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275 { |
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276 assert(words >= filler_array_min_size(), "too small for an array"); |
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277 assert(words <= filler_array_max_size(), "too big for a single object"); |
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278 |
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279 const size_t payload_size = words - filler_array_hdr_size(); |
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280 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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281 |
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282 // Set the length first for concurrent GC. |
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283 ((arrayOop)start)->set_length((int)len); |
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284 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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285 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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286 } |
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287 |
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288 void |
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289 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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290 { |
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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 if (words >= filler_array_min_size()) { |
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294 fill_with_array(start, words, zap); |
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295 } else if (words > 0) { |
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296 assert(words == min_fill_size(), "unaligned size"); |
1142 | 297 post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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298 words); |
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299 } |
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300 } |
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301 |
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302 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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303 { |
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304 DEBUG_ONLY(fill_args_check(start, words);) |
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305 HandleMark hm; // Free handles before leaving. |
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306 fill_with_object_impl(start, words, zap); |
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307 } |
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308 |
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309 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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310 { |
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311 DEBUG_ONLY(fill_args_check(start, words);) |
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312 HandleMark hm; // Free handles before leaving. |
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313 |
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314 #ifdef _LP64 |
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315 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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316 // First fill with arrays, ensuring that any remaining space is big enough to |
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317 // fill. The remainder is filled with a single object. |
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318 const size_t min = min_fill_size(); |
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319 const size_t max = filler_array_max_size(); |
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320 while (words > max) { |
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321 const size_t cur = words - max >= min ? max : max - min; |
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322 fill_with_array(start, cur, zap); |
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323 start += cur; |
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324 words -= cur; |
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325 } |
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326 #endif |
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327 |
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328 fill_with_object_impl(start, words, zap); |
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329 } |
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330 |
0 | 331 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
332 guarantee(false, "thread-local allocation buffers not supported"); | |
333 return NULL; | |
334 } | |
335 | |
336 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
337 // The second disjunct in the assertion below makes a concession | |
338 // for the start-up verification done while the VM is being | |
339 // created. Callers be careful that you know that mutators | |
340 // aren't going to interfere -- for instance, this is permissible | |
341 // if we are still single-threaded and have either not yet | |
342 // started allocating (nothing much to verify) or we have | |
343 // started allocating but are now a full-fledged JavaThread | |
344 // (and have thus made our TLAB's) available for filling. | |
345 assert(SafepointSynchronize::is_at_safepoint() || | |
346 !is_init_completed(), | |
347 "Should only be called at a safepoint or at start-up" | |
348 " otherwise concurrent mutator activity may make heap " | |
349 " unparsable again"); | |
1166 | 350 const bool use_tlab = UseTLAB; |
351 const bool deferred = _defer_initial_card_mark; | |
352 // The main thread starts allocating via a TLAB even before it | |
353 // has added itself to the threads list at vm boot-up. | |
354 assert(!use_tlab || Threads::first() != NULL, | |
355 "Attempt to fill tlabs before main thread has been added" | |
356 " to threads list is doomed to failure!"); | |
357 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
358 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
359 #ifdef COMPILER2 | |
360 // The deferred store barriers must all have been flushed to the | |
361 // card-table (or other remembered set structure) before GC starts | |
362 // processing the card-table (or other remembered set). | |
363 if (deferred) flush_deferred_store_barrier(thread); | |
364 #else | |
365 assert(!deferred, "Should be false"); | |
366 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
367 #endif | |
0 | 368 } |
369 } | |
370 | |
371 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
372 if (UseTLAB) { | |
373 assert(SafepointSynchronize::is_at_safepoint() || | |
374 !is_init_completed(), | |
375 "should only accumulate statistics on tlabs at safepoint"); | |
376 | |
377 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
378 } | |
379 } | |
380 | |
381 void CollectedHeap::resize_all_tlabs() { | |
382 if (UseTLAB) { | |
383 assert(SafepointSynchronize::is_at_safepoint() || | |
384 !is_init_completed(), | |
385 "should only resize tlabs at safepoint"); | |
386 | |
387 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
388 } | |
389 } | |
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390 |
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391 void CollectedHeap::pre_full_gc_dump() { |
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392 if (HeapDumpBeforeFullGC) { |
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393 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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394 // We are doing a "major" collection and a heap dump before |
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395 // major collection has been requested. |
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396 HeapDumper::dump_heap(); |
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397 } |
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398 if (PrintClassHistogramBeforeFullGC) { |
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399 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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400 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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401 inspector.doit(); |
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402 } |
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403 } |
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404 |
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405 void CollectedHeap::post_full_gc_dump() { |
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406 if (HeapDumpAfterFullGC) { |
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407 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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408 HeapDumper::dump_heap(); |
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409 } |
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410 if (PrintClassHistogramAfterFullGC) { |
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411 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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412 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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413 inspector.doit(); |
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414 } |
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415 } |