Mercurial > hg > graal-compiler
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 948:89e0543e1737
6884624: Update copyright year
Summary: Update copyright for files that have been modified in 2009 through Septermber
Reviewed-by: tbell, ohair
author | xdono |
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date | Tue, 22 Sep 2009 14:06:10 -0700 |
parents | 7bb995fbd3c0 |
children | 39b01ab7035a |
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 | |
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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 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 size_t CollectedHeap::filler_array_hdr_size() { |
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141 return size_t(arrayOopDesc::header_size(T_INT)); |
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142 } |
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143 |
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144 size_t CollectedHeap::filler_array_min_size() { |
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145 return align_object_size(filler_array_hdr_size()); |
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146 } |
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147 |
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148 size_t CollectedHeap::filler_array_max_size() { |
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149 return _filler_array_max_size; |
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150 } |
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151 |
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152 #ifdef ASSERT |
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153 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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154 { |
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155 assert(words >= min_fill_size(), "too small to fill"); |
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156 assert(words % MinObjAlignment == 0, "unaligned size"); |
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157 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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158 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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159 } |
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160 |
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161 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words) |
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162 { |
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163 if (ZapFillerObjects) { |
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164 Copy::fill_to_words(start + filler_array_hdr_size(), |
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165 words - filler_array_hdr_size(), 0XDEAFBABE); |
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166 } |
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167 } |
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168 #endif // ASSERT |
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169 |
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170 void |
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171 CollectedHeap::fill_with_array(HeapWord* start, size_t words) |
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172 { |
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173 assert(words >= filler_array_min_size(), "too small for an array"); |
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174 assert(words <= filler_array_max_size(), "too big for a single object"); |
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175 |
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176 const size_t payload_size = words - filler_array_hdr_size(); |
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177 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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178 |
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179 // Set the length first for concurrent GC. |
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180 ((arrayOop)start)->set_length((int)len); |
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181 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
481
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182 DEBUG_ONLY(zap_filler_array(start, words);) |
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183 } |
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184 |
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185 void |
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186 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words) |
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187 { |
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188 assert(words <= filler_array_max_size(), "too big for a single object"); |
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189 |
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190 if (words >= filler_array_min_size()) { |
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191 fill_with_array(start, words); |
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192 } else if (words > 0) { |
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193 assert(words == min_fill_size(), "unaligned size"); |
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194 post_allocation_setup_common(SystemDictionary::object_klass(), start, |
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195 words); |
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196 } |
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197 } |
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198 |
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199 void CollectedHeap::fill_with_object(HeapWord* start, size_t words) |
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200 { |
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201 DEBUG_ONLY(fill_args_check(start, words);) |
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202 HandleMark hm; // Free handles before leaving. |
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203 fill_with_object_impl(start, words); |
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204 } |
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205 |
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206 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words) |
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207 { |
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208 DEBUG_ONLY(fill_args_check(start, words);) |
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209 HandleMark hm; // Free handles before leaving. |
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210 |
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211 #ifdef LP64 |
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212 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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213 // First fill with arrays, ensuring that any remaining space is big enough to |
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214 // fill. The remainder is filled with a single object. |
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215 const size_t min = min_fill_size(); |
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216 const size_t max = filler_array_max_size(); |
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217 while (words > max) { |
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218 const size_t cur = words - max >= min ? max : max - min; |
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219 fill_with_array(start, cur); |
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220 start += cur; |
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221 words -= cur; |
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222 } |
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223 #endif |
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224 |
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225 fill_with_object_impl(start, words); |
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226 } |
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227 |
0 | 228 oop CollectedHeap::new_store_barrier(oop new_obj) { |
229 // %%% This needs refactoring. (It was imported from the server compiler.) | |
230 guarantee(can_elide_tlab_store_barriers(), "store barrier elision not supported"); | |
231 BarrierSet* bs = this->barrier_set(); | |
232 assert(bs->has_write_region_opt(), "Barrier set does not have write_region"); | |
233 int new_size = new_obj->size(); | |
234 bs->write_region(MemRegion((HeapWord*)new_obj, new_size)); | |
235 return new_obj; | |
236 } | |
237 | |
238 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { | |
239 guarantee(false, "thread-local allocation buffers not supported"); | |
240 return NULL; | |
241 } | |
242 | |
243 void CollectedHeap::fill_all_tlabs(bool retire) { | |
244 assert(UseTLAB, "should not reach here"); | |
245 // See note in ensure_parsability() below. | |
246 assert(SafepointSynchronize::is_at_safepoint() || | |
247 !is_init_completed(), | |
248 "should only fill tlabs at safepoint"); | |
249 // The main thread starts allocating via a TLAB even before it | |
250 // has added itself to the threads list at vm boot-up. | |
251 assert(Threads::first() != NULL, | |
252 "Attempt to fill tlabs before main thread has been added" | |
253 " to threads list is doomed to failure!"); | |
254 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
255 thread->tlab().make_parsable(retire); | |
256 } | |
257 } | |
258 | |
259 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
260 // The second disjunct in the assertion below makes a concession | |
261 // for the start-up verification done while the VM is being | |
262 // created. Callers be careful that you know that mutators | |
263 // aren't going to interfere -- for instance, this is permissible | |
264 // if we are still single-threaded and have either not yet | |
265 // started allocating (nothing much to verify) or we have | |
266 // started allocating but are now a full-fledged JavaThread | |
267 // (and have thus made our TLAB's) available for filling. | |
268 assert(SafepointSynchronize::is_at_safepoint() || | |
269 !is_init_completed(), | |
270 "Should only be called at a safepoint or at start-up" | |
271 " otherwise concurrent mutator activity may make heap " | |
272 " unparsable again"); | |
273 if (UseTLAB) { | |
274 fill_all_tlabs(retire_tlabs); | |
275 } | |
276 } | |
277 | |
278 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
279 if (UseTLAB) { | |
280 assert(SafepointSynchronize::is_at_safepoint() || | |
281 !is_init_completed(), | |
282 "should only accumulate statistics on tlabs at safepoint"); | |
283 | |
284 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
285 } | |
286 } | |
287 | |
288 void CollectedHeap::resize_all_tlabs() { | |
289 if (UseTLAB) { | |
290 assert(SafepointSynchronize::is_at_safepoint() || | |
291 !is_init_completed(), | |
292 "should only resize tlabs at safepoint"); | |
293 | |
294 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
295 } | |
296 } | |
615
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297 |
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298 void CollectedHeap::pre_full_gc_dump() { |
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299 if (HeapDumpBeforeFullGC) { |
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300 TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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301 // We are doing a "major" collection and a heap dump before |
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302 // major collection has been requested. |
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303 HeapDumper::dump_heap(); |
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304 } |
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305 if (PrintClassHistogramBeforeFullGC) { |
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306 TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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307 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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308 inspector.doit(); |
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309 } |
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310 } |
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311 |
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312 void CollectedHeap::post_full_gc_dump() { |
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313 if (HeapDumpAfterFullGC) { |
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314 TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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315 HeapDumper::dump_heap(); |
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316 } |
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317 if (PrintClassHistogramAfterFullGC) { |
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318 TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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319 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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320 inspector.doit(); |
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321 } |
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322 } |