Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 1165:2dd52dea6d28
6902115: G1:assert(ignore_max_completed||thread->is_Java_thread()||SafepointSynchronize::is_at_safepoint())
Summary: Remove invalid assert and mangle filler objects in TLABs that are being retired.
Reviewed-by: ysr, jmasa
author | johnc |
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date | Tue, 12 Jan 2010 14:56:46 -0800 |
parents | 4ce7240d622c |
children | 7b0e9cba0307 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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 | |
481
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33 size_t CollectedHeap::_filler_array_max_size = 0; |
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34 |
0 | 35 // Memory state functions. |
36 | |
481
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37 CollectedHeap::CollectedHeap() |
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38 { |
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39 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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40 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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41 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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42 max_len * elements_per_word); |
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43 |
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44 _barrier_set = NULL; |
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45 _is_gc_active = false; |
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46 _total_collections = _total_full_collections = 0; |
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47 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 48 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
49 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
50 | |
51 if (UsePerfData) { | |
52 EXCEPTION_MARK; | |
53 | |
54 // create the gc cause jvmstat counters | |
55 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
56 80, GCCause::to_string(_gc_cause), CHECK); | |
57 | |
58 _perf_gc_lastcause = | |
59 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
60 80, GCCause::to_string(_gc_lastcause), CHECK); | |
61 } | |
62 } | |
63 | |
64 | |
65 #ifndef PRODUCT | |
66 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
67 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
68 for (size_t slot = 0; slot < size; slot += 1) { | |
69 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
70 "Found badHeapWordValue in post-allocation check"); | |
71 } | |
72 } | |
73 } | |
74 | |
75 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) | |
76 { | |
77 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
78 for (size_t slot = 0; slot < size; slot += 1) { | |
79 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
80 "Found non badHeapWordValue in pre-allocation check"); | |
81 } | |
82 } | |
83 } | |
84 #endif // PRODUCT | |
85 | |
86 #ifdef ASSERT | |
87 void CollectedHeap::check_for_valid_allocation_state() { | |
88 Thread *thread = Thread::current(); | |
89 // How to choose between a pending exception and a potential | |
90 // OutOfMemoryError? Don't allow pending exceptions. | |
91 // This is a VM policy failure, so how do we exhaustively test it? | |
92 assert(!thread->has_pending_exception(), | |
93 "shouldn't be allocating with pending exception"); | |
94 if (StrictSafepointChecks) { | |
95 assert(thread->allow_allocation(), | |
96 "Allocation done by thread for which allocation is blocked " | |
97 "by No_Allocation_Verifier!"); | |
98 // Allocation of an oop can always invoke a safepoint, | |
99 // hence, the true argument | |
100 thread->check_for_valid_safepoint_state(true); | |
101 } | |
102 } | |
103 #endif | |
104 | |
105 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
106 | |
107 // Retain tlab and allocate object in shared space if | |
108 // the amount free in the tlab is too large to discard. | |
109 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
110 thread->tlab().record_slow_allocation(size); | |
111 return NULL; | |
112 } | |
113 | |
114 // Discard tlab and allocate a new one. | |
115 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
116 size_t new_tlab_size = thread->tlab().compute_size(size); | |
117 | |
118 thread->tlab().clear_before_allocation(); | |
119 | |
120 if (new_tlab_size == 0) { | |
121 return NULL; | |
122 } | |
123 | |
124 // Allocate a new TLAB... | |
125 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
126 if (obj == NULL) { | |
127 return NULL; | |
128 } | |
129 if (ZeroTLAB) { | |
130 // ..and clear it. | |
131 Copy::zero_to_words(obj, new_tlab_size); | |
132 } else { | |
133 // ...and clear just the allocated object. | |
134 Copy::zero_to_words(obj, size); | |
135 } | |
136 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
137 return obj; | |
138 } | |
139 | |
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140 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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141 MemRegion deferred = thread->deferred_card_mark(); |
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142 if (!deferred.is_empty()) { |
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143 { |
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144 // Verify that the storage points to a parsable object in heap |
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145 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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146 assert(is_in(old_obj), "Not in allocated heap"); |
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147 assert(!can_elide_initializing_store_barrier(old_obj), |
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148 "Else should have been filtered in defer_store_barrier()"); |
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149 assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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150 assert(old_obj->is_oop(true), "Not an oop"); |
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151 assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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152 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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153 "Mismatch: multiple objects?"); |
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154 } |
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155 BarrierSet* bs = barrier_set(); |
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156 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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157 bs->write_region(deferred); |
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158 // "Clear" the deferred_card_mark field |
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159 thread->set_deferred_card_mark(MemRegion()); |
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160 } |
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161 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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162 } |
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163 |
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164 // Helper for ReduceInitialCardMarks. For performance, |
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165 // compiled code may elide card-marks for initializing stores |
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166 // to a newly allocated object along the fast-path. We |
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167 // compensate for such elided card-marks as follows: |
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168 // (a) Generational, non-concurrent collectors, such as |
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169 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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170 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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171 // need the card-mark if and only if the region is |
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172 // in the old gen, and do not care if the card-mark |
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173 // succeeds or precedes the initializing stores themselves, |
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174 // so long as the card-mark is completed before the next |
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175 // scavenge. For all these cases, we can do a card mark |
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176 // at the point at which we do a slow path allocation |
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177 // in the old gen. For uniformity, however, we end |
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178 // up using the same scheme (see below) for all three |
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179 // cases (deferring the card-mark appropriately). |
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180 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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181 // in addition that the card-mark for an old gen allocated |
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182 // object strictly follow any associated initializing stores. |
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183 // In these cases, the memRegion remembered below is |
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184 // used to card-mark the entire region either just before the next |
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185 // slow-path allocation by this thread or just before the next scavenge or |
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186 // CMS-associated safepoint, whichever of these events happens first. |
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187 // (The implicit assumption is that the object has been fully |
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188 // initialized by this point, a fact that we assert when doing the |
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189 // card-mark.) |
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190 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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191 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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192 // is used to remember the pre-value of any store. Initializing |
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193 // stores will not need this barrier, so we need not worry about |
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194 // compensating for the missing pre-barrier here. Turning now |
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195 // to the post-barrier, we note that G1 needs a RS update barrier |
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196 // which simply enqueues a (sequence of) dirty cards which may |
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197 // optionally be refined by the concurrent update threads. Note |
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198 // that this barrier need only be applied to a non-young write, |
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199 // but, like in CMS, because of the presence of concurrent refinement |
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200 // (much like CMS' precleaning), must strictly follow the oop-store. |
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201 // Thus, using the same protocol for maintaining the intended |
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202 // invariants turns out, serendepitously, to be the same for all |
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203 // three collectors/heap types above. |
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204 // |
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205 // For each future collector, this should be reexamined with |
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206 // that specific collector in mind. |
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207 oop CollectedHeap::defer_store_barrier(JavaThread* thread, oop new_obj) { |
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208 // If a previous card-mark was deferred, flush it now. |
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209 flush_deferred_store_barrier(thread); |
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210 if (can_elide_initializing_store_barrier(new_obj)) { |
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211 // The deferred_card_mark region should be empty |
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212 // following the flush above. |
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213 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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214 } else { |
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215 // Remember info for the newly deferred store barrier |
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216 MemRegion deferred = MemRegion((HeapWord*)new_obj, new_obj->size()); |
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217 assert(!deferred.is_empty(), "Error"); |
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218 thread->set_deferred_card_mark(deferred); |
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219 } |
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220 return new_obj; |
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221 } |
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222 |
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223 size_t CollectedHeap::filler_array_hdr_size() { |
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224 return size_t(arrayOopDesc::header_size(T_INT)); |
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225 } |
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226 |
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227 size_t CollectedHeap::filler_array_min_size() { |
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228 return align_object_size(filler_array_hdr_size()); |
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229 } |
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230 |
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231 size_t CollectedHeap::filler_array_max_size() { |
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232 return _filler_array_max_size; |
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233 } |
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234 |
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235 #ifdef ASSERT |
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236 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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237 { |
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238 assert(words >= min_fill_size(), "too small to fill"); |
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239 assert(words % MinObjAlignment == 0, "unaligned size"); |
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240 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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241 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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242 } |
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243 |
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244 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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245 { |
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246 if (ZapFillerObjects && zap) { |
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247 Copy::fill_to_words(start + filler_array_hdr_size(), |
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248 words - filler_array_hdr_size(), 0XDEAFBABE); |
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249 } |
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250 } |
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251 #endif // ASSERT |
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252 |
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253 void |
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254 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
481
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255 { |
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256 assert(words >= filler_array_min_size(), "too small for an array"); |
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257 assert(words <= filler_array_max_size(), "too big for a single object"); |
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258 |
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259 const size_t payload_size = words - filler_array_hdr_size(); |
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260 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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261 |
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262 // Set the length first for concurrent GC. |
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263 ((arrayOop)start)->set_length((int)len); |
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264 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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265 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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266 } |
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267 |
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268 void |
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269 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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270 { |
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271 assert(words <= filler_array_max_size(), "too big for a single object"); |
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272 |
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273 if (words >= filler_array_min_size()) { |
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274 fill_with_array(start, words, zap); |
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275 } else if (words > 0) { |
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276 assert(words == min_fill_size(), "unaligned size"); |
1142 | 277 post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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278 words); |
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279 } |
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280 } |
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281 |
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282 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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283 { |
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284 DEBUG_ONLY(fill_args_check(start, words);) |
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285 HandleMark hm; // Free handles before leaving. |
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286 fill_with_object_impl(start, words, zap); |
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287 } |
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288 |
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289 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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290 { |
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291 DEBUG_ONLY(fill_args_check(start, words);) |
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292 HandleMark hm; // Free handles before leaving. |
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293 |
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294 #ifdef LP64 |
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295 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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296 // First fill with arrays, ensuring that any remaining space is big enough to |
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297 // fill. The remainder is filled with a single object. |
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298 const size_t min = min_fill_size(); |
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299 const size_t max = filler_array_max_size(); |
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300 while (words > max) { |
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301 const size_t cur = words - max >= min ? max : max - min; |
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302 fill_with_array(start, cur, zap); |
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303 start += cur; |
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304 words -= cur; |
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305 } |
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306 #endif |
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307 |
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308 fill_with_object_impl(start, words, zap); |
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309 } |
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310 |
0 | 311 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
312 guarantee(false, "thread-local allocation buffers not supported"); | |
313 return NULL; | |
314 } | |
315 | |
316 void CollectedHeap::fill_all_tlabs(bool retire) { | |
317 assert(UseTLAB, "should not reach here"); | |
318 // See note in ensure_parsability() below. | |
319 assert(SafepointSynchronize::is_at_safepoint() || | |
320 !is_init_completed(), | |
321 "should only fill tlabs at safepoint"); | |
322 // The main thread starts allocating via a TLAB even before it | |
323 // has added itself to the threads list at vm boot-up. | |
324 assert(Threads::first() != NULL, | |
325 "Attempt to fill tlabs before main thread has been added" | |
326 " to threads list is doomed to failure!"); | |
327 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
328 thread->tlab().make_parsable(retire); | |
329 } | |
330 } | |
331 | |
332 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
333 // The second disjunct in the assertion below makes a concession | |
334 // for the start-up verification done while the VM is being | |
335 // created. Callers be careful that you know that mutators | |
336 // aren't going to interfere -- for instance, this is permissible | |
337 // if we are still single-threaded and have either not yet | |
338 // started allocating (nothing much to verify) or we have | |
339 // started allocating but are now a full-fledged JavaThread | |
340 // (and have thus made our TLAB's) available for filling. | |
341 assert(SafepointSynchronize::is_at_safepoint() || | |
342 !is_init_completed(), | |
343 "Should only be called at a safepoint or at start-up" | |
344 " otherwise concurrent mutator activity may make heap " | |
345 " unparsable again"); | |
346 if (UseTLAB) { | |
347 fill_all_tlabs(retire_tlabs); | |
348 } | |
349 } | |
350 | |
351 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
352 if (UseTLAB) { | |
353 assert(SafepointSynchronize::is_at_safepoint() || | |
354 !is_init_completed(), | |
355 "should only accumulate statistics on tlabs at safepoint"); | |
356 | |
357 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
358 } | |
359 } | |
360 | |
361 void CollectedHeap::resize_all_tlabs() { | |
362 if (UseTLAB) { | |
363 assert(SafepointSynchronize::is_at_safepoint() || | |
364 !is_init_completed(), | |
365 "should only resize tlabs at safepoint"); | |
366 | |
367 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
368 } | |
369 } | |
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370 |
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371 void CollectedHeap::pre_full_gc_dump() { |
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372 if (HeapDumpBeforeFullGC) { |
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373 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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374 // We are doing a "major" collection and a heap dump before |
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375 // major collection has been requested. |
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376 HeapDumper::dump_heap(); |
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377 } |
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378 if (PrintClassHistogramBeforeFullGC) { |
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379 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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380 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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381 inspector.doit(); |
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382 } |
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383 } |
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384 |
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385 void CollectedHeap::post_full_gc_dump() { |
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386 if (HeapDumpAfterFullGC) { |
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387 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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388 HeapDumper::dump_heap(); |
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389 } |
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390 if (PrintClassHistogramAfterFullGC) { |
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391 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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392 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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393 inspector.doit(); |
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394 } |
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395 } |