Mercurial > hg > graal-compiler
annotate src/share/vm/code/codeCache.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author | stefank |
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date | Mon, 07 Jul 2014 10:12:40 +0200 |
parents | 882004b9e7e1 |
children | aff6ccb506cb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 "code/codeBlob.hpp" | |
27 #include "code/codeCache.hpp" | |
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28 #include "code/compiledIC.hpp" |
1972 | 29 #include "code/dependencies.hpp" |
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30 #include "code/icBuffer.hpp" |
1972 | 31 #include "code/nmethod.hpp" |
32 #include "code/pcDesc.hpp" | |
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33 #include "compiler/compileBroker.hpp" |
1972 | 34 #include "gc_implementation/shared/markSweep.hpp" |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/gcLocker.hpp" | |
37 #include "memory/iterator.hpp" | |
38 #include "memory/resourceArea.hpp" | |
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39 #include "oops/method.hpp" |
1972 | 40 #include "oops/objArrayOop.hpp" |
41 #include "oops/oop.inline.hpp" | |
42 #include "runtime/handles.inline.hpp" | |
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43 #include "runtime/arguments.hpp" |
1972 | 44 #include "runtime/icache.hpp" |
45 #include "runtime/java.hpp" | |
46 #include "runtime/mutexLocker.hpp" | |
47 #include "services/memoryService.hpp" | |
10405 | 48 #include "trace/tracing.hpp" |
1972 | 49 #include "utilities/xmlstream.hpp" |
0 | 50 |
51 // Helper class for printing in CodeCache | |
52 | |
53 class CodeBlob_sizes { | |
54 private: | |
55 int count; | |
56 int total_size; | |
57 int header_size; | |
58 int code_size; | |
59 int stub_size; | |
60 int relocation_size; | |
61 int scopes_oop_size; | |
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62 int scopes_metadata_size; |
0 | 63 int scopes_data_size; |
64 int scopes_pcs_size; | |
65 | |
66 public: | |
67 CodeBlob_sizes() { | |
68 count = 0; | |
69 total_size = 0; | |
70 header_size = 0; | |
71 code_size = 0; | |
72 stub_size = 0; | |
73 relocation_size = 0; | |
74 scopes_oop_size = 0; | |
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75 scopes_metadata_size = 0; |
0 | 76 scopes_data_size = 0; |
77 scopes_pcs_size = 0; | |
78 } | |
79 | |
80 int total() { return total_size; } | |
81 bool is_empty() { return count == 0; } | |
82 | |
83 void print(const char* title) { | |
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84 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])", |
0 | 85 count, |
86 title, | |
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87 (int)(total() / K), |
0 | 88 header_size * 100 / total_size, |
89 relocation_size * 100 / total_size, | |
90 code_size * 100 / total_size, | |
91 stub_size * 100 / total_size, | |
92 scopes_oop_size * 100 / total_size, | |
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93 scopes_metadata_size * 100 / total_size, |
0 | 94 scopes_data_size * 100 / total_size, |
95 scopes_pcs_size * 100 / total_size); | |
96 } | |
97 | |
98 void add(CodeBlob* cb) { | |
99 count++; | |
100 total_size += cb->size(); | |
101 header_size += cb->header_size(); | |
102 relocation_size += cb->relocation_size(); | |
103 if (cb->is_nmethod()) { | |
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104 nmethod* nm = cb->as_nmethod_or_null(); |
1748 | 105 code_size += nm->insts_size(); |
0 | 106 stub_size += nm->stub_size(); |
107 | |
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108 scopes_oop_size += nm->oops_size(); |
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109 scopes_metadata_size += nm->metadata_size(); |
0 | 110 scopes_data_size += nm->scopes_data_size(); |
111 scopes_pcs_size += nm->scopes_pcs_size(); | |
112 } else { | |
1748 | 113 code_size += cb->code_size(); |
0 | 114 } |
115 } | |
116 }; | |
117 | |
118 // CodeCache implementation | |
119 | |
120 CodeHeap * CodeCache::_heap = new CodeHeap(); | |
121 int CodeCache::_number_of_blobs = 0; | |
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122 int CodeCache::_number_of_adapters = 0; |
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123 int CodeCache::_number_of_nmethods = 0; |
0 | 124 int CodeCache::_number_of_nmethods_with_dependencies = 0; |
125 bool CodeCache::_needs_cache_clean = false; | |
989 | 126 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
0 | 127 |
10405 | 128 int CodeCache::_codemem_full_count = 0; |
0 | 129 |
130 CodeBlob* CodeCache::first() { | |
131 assert_locked_or_safepoint(CodeCache_lock); | |
132 return (CodeBlob*)_heap->first(); | |
133 } | |
134 | |
135 | |
136 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
137 assert_locked_or_safepoint(CodeCache_lock); | |
138 return (CodeBlob*)_heap->next(cb); | |
139 } | |
140 | |
141 | |
142 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
143 assert_locked_or_safepoint(CodeCache_lock); | |
144 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
145 return cb; | |
146 } | |
147 | |
148 | |
149 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
150 assert_locked_or_safepoint(CodeCache_lock); | |
151 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
152 return (nmethod*)cb; | |
153 } | |
154 | |
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155 nmethod* CodeCache::first_nmethod() { |
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156 assert_locked_or_safepoint(CodeCache_lock); |
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157 CodeBlob* cb = first(); |
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158 while (cb != NULL && !cb->is_nmethod()) { |
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159 cb = next(cb); |
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160 } |
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161 return (nmethod*)cb; |
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162 } |
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163 |
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164 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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165 assert_locked_or_safepoint(CodeCache_lock); |
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166 cb = next(cb); |
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167 while (cb != NULL && !cb->is_nmethod()) { |
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168 cb = next(cb); |
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169 } |
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170 return (nmethod*)cb; |
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171 } |
0 | 172 |
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173 static size_t maxCodeCacheUsed = 0; |
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174 |
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175 CodeBlob* CodeCache::allocate(int size, bool is_critical) { |
0 | 176 // Do not seize the CodeCache lock here--if the caller has not |
177 // already done so, we are going to lose bigtime, since the code | |
178 // cache will contain a garbage CodeBlob until the caller can | |
179 // run the constructor for the CodeBlob subclass he is busy | |
180 // instantiating. | |
181 guarantee(size >= 0, "allocation request must be reasonable"); | |
182 assert_locked_or_safepoint(CodeCache_lock); | |
183 CodeBlob* cb = NULL; | |
184 _number_of_blobs++; | |
185 while (true) { | |
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186 cb = (CodeBlob*)_heap->allocate(size, is_critical); |
0 | 187 if (cb != NULL) break; |
188 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
189 // Expansion failed | |
190 return NULL; | |
191 } | |
192 if (PrintCodeCacheExtension) { | |
193 ResourceMark rm; | |
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194 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)", |
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195 (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(), |
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196 (address)_heap->high() - (address)_heap->low_boundary()); |
0 | 197 } |
198 } | |
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199 maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() - |
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200 (address)_heap->low_boundary()) - unallocated_capacity()); |
0 | 201 verify_if_often(); |
989 | 202 print_trace("allocation", cb, size); |
0 | 203 return cb; |
204 } | |
205 | |
206 void CodeCache::free(CodeBlob* cb) { | |
207 assert_locked_or_safepoint(CodeCache_lock); | |
208 verify_if_often(); | |
209 | |
989 | 210 print_trace("free", cb); |
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211 if (cb->is_nmethod()) { |
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212 _number_of_nmethods--; |
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213 if (((nmethod *)cb)->has_dependencies()) { |
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214 _number_of_nmethods_with_dependencies--; |
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215 } |
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216 } |
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217 if (cb->is_adapter_blob()) { |
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218 _number_of_adapters--; |
0 | 219 } |
220 _number_of_blobs--; | |
221 | |
222 _heap->deallocate(cb); | |
223 | |
224 verify_if_often(); | |
225 assert(_number_of_blobs >= 0, "sanity check"); | |
226 } | |
227 | |
228 | |
229 void CodeCache::commit(CodeBlob* cb) { | |
230 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
231 assert_locked_or_safepoint(CodeCache_lock); | |
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232 if (cb->is_nmethod()) { |
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233 _number_of_nmethods++; |
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234 if (((nmethod *)cb)->has_dependencies()) { |
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235 _number_of_nmethods_with_dependencies++; |
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236 } |
0 | 237 } |
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238 if (cb->is_adapter_blob()) { |
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239 _number_of_adapters++; |
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240 } |
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241 |
0 | 242 // flush the hardware I-cache |
1748 | 243 ICache::invalidate_range(cb->content_begin(), cb->content_size()); |
0 | 244 } |
245 | |
246 | |
247 void CodeCache::flush() { | |
248 assert_locked_or_safepoint(CodeCache_lock); | |
249 Unimplemented(); | |
250 } | |
251 | |
252 | |
253 // Iteration over CodeBlobs | |
254 | |
255 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
256 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
257 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
258 | |
259 | |
260 bool CodeCache::contains(void *p) { | |
261 // It should be ok to call contains without holding a lock | |
262 return _heap->contains(p); | |
263 } | |
264 | |
265 | |
266 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
267 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
268 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
269 CodeBlob* CodeCache::find_blob(void* start) { | |
270 CodeBlob* result = find_blob_unsafe(start); | |
271 if (result == NULL) return NULL; | |
272 // We could potientially look up non_entrant methods | |
273 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
274 return result; | |
275 } | |
276 | |
277 nmethod* CodeCache::find_nmethod(void* start) { | |
278 CodeBlob *cb = find_blob(start); | |
279 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
280 return (nmethod*)cb; | |
281 } | |
282 | |
283 | |
284 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
285 assert_locked_or_safepoint(CodeCache_lock); | |
286 FOR_ALL_BLOBS(p) { | |
287 f(p); | |
288 } | |
289 } | |
290 | |
291 | |
292 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
293 assert_locked_or_safepoint(CodeCache_lock); | |
294 FOR_ALL_BLOBS(nm) { | |
295 if (nm->is_nmethod()) f((nmethod*)nm); | |
296 } | |
297 } | |
298 | |
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299 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) { |
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300 assert_locked_or_safepoint(CodeCache_lock); |
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301 FOR_ALL_ALIVE_NMETHODS(nm) { |
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302 f(nm); |
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303 } |
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304 } |
0 | 305 |
306 int CodeCache::alignment_unit() { | |
307 return (int)_heap->alignment_unit(); | |
308 } | |
309 | |
310 | |
311 int CodeCache::alignment_offset() { | |
312 return (int)_heap->alignment_offset(); | |
313 } | |
314 | |
315 | |
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316 // Mark nmethods for unloading if they contain otherwise unreachable |
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317 // oops. |
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318 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { |
0 | 319 assert_locked_or_safepoint(CodeCache_lock); |
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320 FOR_ALL_ALIVE_NMETHODS(nm) { |
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321 nm->do_unloading(is_alive, unloading_occurred); |
0 | 322 } |
323 } | |
324 | |
989 | 325 void CodeCache::blobs_do(CodeBlobClosure* f) { |
0 | 326 assert_locked_or_safepoint(CodeCache_lock); |
327 FOR_ALL_ALIVE_BLOBS(cb) { | |
989 | 328 f->do_code_blob(cb); |
329 | |
330 #ifdef ASSERT | |
331 if (cb->is_nmethod()) | |
332 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
333 #endif //ASSERT | |
0 | 334 } |
335 } | |
336 | |
989 | 337 // Walk the list of methods which might contain non-perm oops. |
338 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
339 assert_locked_or_safepoint(CodeCache_lock); | |
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340 |
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341 if (UseG1GC) { |
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342 return; |
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343 } |
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344 |
989 | 345 debug_only(mark_scavenge_root_nmethods()); |
346 | |
347 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
348 debug_only(cur->clear_scavenge_root_marked()); | |
349 assert(cur->scavenge_root_not_marked(), ""); | |
350 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
351 | |
352 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
353 #ifndef PRODUCT | |
354 if (TraceScavenge) { | |
355 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
356 } | |
357 #endif //PRODUCT | |
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358 if (is_live) { |
989 | 359 // Perform cur->oops_do(f), maybe just once per nmethod. |
360 f->do_code_blob(cur); | |
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361 } |
989 | 362 } |
363 | |
364 // Check for stray marks. | |
365 debug_only(verify_perm_nmethods(NULL)); | |
366 } | |
367 | |
368 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
369 assert_locked_or_safepoint(CodeCache_lock); | |
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370 |
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371 if (UseG1GC) { |
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372 return; |
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373 } |
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374 |
989 | 375 nm->set_on_scavenge_root_list(); |
376 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
377 set_scavenge_root_nmethods(nm); | |
378 print_trace("add_scavenge_root", nm); | |
379 } | |
380 | |
381 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
382 assert_locked_or_safepoint(CodeCache_lock); | |
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383 |
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384 if (UseG1GC) { |
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385 return; |
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386 } |
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387 |
989 | 388 print_trace("drop_scavenge_root", nm); |
389 nmethod* last = NULL; | |
390 nmethod* cur = scavenge_root_nmethods(); | |
391 while (cur != NULL) { | |
392 nmethod* next = cur->scavenge_root_link(); | |
393 if (cur == nm) { | |
394 if (last != NULL) | |
395 last->set_scavenge_root_link(next); | |
396 else set_scavenge_root_nmethods(next); | |
397 nm->set_scavenge_root_link(NULL); | |
398 nm->clear_on_scavenge_root_list(); | |
399 return; | |
400 } | |
401 last = cur; | |
402 cur = next; | |
403 } | |
404 assert(false, "should have been on list"); | |
405 } | |
406 | |
407 void CodeCache::prune_scavenge_root_nmethods() { | |
408 assert_locked_or_safepoint(CodeCache_lock); | |
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409 |
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410 if (UseG1GC) { |
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411 return; |
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412 } |
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413 |
989 | 414 debug_only(mark_scavenge_root_nmethods()); |
415 | |
416 nmethod* last = NULL; | |
417 nmethod* cur = scavenge_root_nmethods(); | |
418 while (cur != NULL) { | |
419 nmethod* next = cur->scavenge_root_link(); | |
420 debug_only(cur->clear_scavenge_root_marked()); | |
421 assert(cur->scavenge_root_not_marked(), ""); | |
422 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
423 | |
424 if (!cur->is_zombie() && !cur->is_unloaded() | |
425 && cur->detect_scavenge_root_oops()) { | |
426 // Keep it. Advance 'last' to prevent deletion. | |
427 last = cur; | |
428 } else { | |
429 // Prune it from the list, so we don't have to look at it any more. | |
430 print_trace("prune_scavenge_root", cur); | |
431 cur->set_scavenge_root_link(NULL); | |
432 cur->clear_on_scavenge_root_list(); | |
433 if (last != NULL) | |
434 last->set_scavenge_root_link(next); | |
435 else set_scavenge_root_nmethods(next); | |
436 } | |
437 cur = next; | |
438 } | |
439 | |
440 // Check for stray marks. | |
441 debug_only(verify_perm_nmethods(NULL)); | |
442 } | |
443 | |
444 #ifndef PRODUCT | |
445 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
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446 if (UseG1GC) { |
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447 return; |
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448 } |
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449 |
989 | 450 // While we are here, verify the integrity of the list. |
451 mark_scavenge_root_nmethods(); | |
452 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
453 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
454 cur->clear_scavenge_root_marked(); | |
455 } | |
456 verify_perm_nmethods(f); | |
457 } | |
458 | |
459 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
460 void CodeCache::mark_scavenge_root_nmethods() { | |
461 FOR_ALL_ALIVE_BLOBS(cb) { | |
462 if (cb->is_nmethod()) { | |
463 nmethod *nm = (nmethod*)cb; | |
464 assert(nm->scavenge_root_not_marked(), "clean state"); | |
465 if (nm->on_scavenge_root_list()) | |
466 nm->set_scavenge_root_marked(); | |
467 } | |
468 } | |
469 } | |
470 | |
471 // If the closure is given, run it on the unlisted nmethods. | |
472 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
473 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
474 FOR_ALL_ALIVE_BLOBS(cb) { | |
475 bool call_f = (f_or_null != NULL); | |
476 if (cb->is_nmethod()) { | |
477 nmethod *nm = (nmethod*)cb; | |
478 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
479 if (nm->on_scavenge_root_list()) | |
480 call_f = false; // don't show this one to the client | |
481 nm->verify_scavenge_root_oops(); | |
482 } else { | |
483 call_f = false; // not an nmethod | |
484 } | |
485 if (call_f) f_or_null->do_code_blob(cb); | |
486 } | |
487 } | |
488 #endif //PRODUCT | |
489 | |
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490 void CodeCache::verify_clean_inline_caches() { |
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491 #ifdef ASSERT |
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492 FOR_ALL_ALIVE_BLOBS(cb) { |
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493 if (cb->is_nmethod()) { |
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494 nmethod* nm = (nmethod*)cb; |
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495 assert(!nm->is_unloaded(), "Tautology"); |
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496 nm->verify_clean_inline_caches(); |
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497 nm->verify(); |
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498 } |
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499 } |
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500 #endif |
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501 } |
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502 |
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503 void CodeCache::verify_icholder_relocations() { |
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504 #ifdef ASSERT |
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505 // make sure that we aren't leaking icholders |
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506 int count = 0; |
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507 FOR_ALL_BLOBS(cb) { |
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508 if (cb->is_nmethod()) { |
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509 nmethod* nm = (nmethod*)cb; |
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510 count += nm->verify_icholder_relocations(); |
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511 } |
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512 } |
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513 |
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514 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() == |
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515 CompiledICHolder::live_count(), "must agree"); |
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516 #endif |
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517 } |
1202 | 518 |
0 | 519 void CodeCache::gc_prologue() { |
520 } | |
521 | |
522 void CodeCache::gc_epilogue() { | |
523 assert_locked_or_safepoint(CodeCache_lock); | |
524 FOR_ALL_ALIVE_BLOBS(cb) { | |
525 if (cb->is_nmethod()) { | |
526 nmethod *nm = (nmethod*)cb; | |
527 assert(!nm->is_unloaded(), "Tautology"); | |
528 if (needs_cache_clean()) { | |
529 nm->cleanup_inline_caches(); | |
530 } | |
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531 DEBUG_ONLY(nm->verify()); |
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532 DEBUG_ONLY(nm->verify_oop_relocations()); |
0 | 533 } |
534 } | |
535 set_needs_cache_clean(false); | |
989 | 536 prune_scavenge_root_nmethods(); |
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537 |
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538 verify_icholder_relocations(); |
0 | 539 } |
540 | |
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541 void CodeCache::verify_oops() { |
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542 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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543 VerifyOopClosure voc; |
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544 FOR_ALL_ALIVE_BLOBS(cb) { |
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545 if (cb->is_nmethod()) { |
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546 nmethod *nm = (nmethod*)cb; |
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547 nm->oops_do(&voc); |
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548 nm->verify_oop_relocations(); |
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549 } |
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550 } |
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551 } |
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552 |
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553 |
0 | 554 address CodeCache::first_address() { |
555 assert_locked_or_safepoint(CodeCache_lock); | |
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556 return (address)_heap->low_boundary(); |
0 | 557 } |
558 | |
559 | |
560 address CodeCache::last_address() { | |
561 assert_locked_or_safepoint(CodeCache_lock); | |
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562 return (address)_heap->high(); |
0 | 563 } |
564 | |
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565 /** |
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566 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache |
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567 * is free, reverse_free_ratio() returns 4. |
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568 */ |
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569 double CodeCache::reverse_free_ratio() { |
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570 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace); |
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571 double max_capacity = (double)CodeCache::max_capacity(); |
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572 return max_capacity / unallocated_capacity; |
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573 } |
0 | 574 |
575 void icache_init(); | |
576 | |
577 void CodeCache::initialize() { | |
578 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
579 #ifdef COMPILER2 | |
580 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
581 #endif | |
582 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
583 // This was originally just a check of the alignment, causing failure, instead, round | |
584 // the code cache to the page size. In particular, Solaris is moving to a larger | |
585 // default page size. | |
586 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
587 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
588 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
589 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
590 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
591 } | |
592 | |
593 MemoryService::add_code_heap_memory_pool(_heap); | |
594 | |
595 // Initialize ICache flush mechanism | |
596 // This service is needed for os::register_code_area | |
597 icache_init(); | |
598 | |
599 // Give OS a chance to register generated code area. | |
600 // This is used on Windows 64 bit platforms to register | |
601 // Structured Exception Handlers for our generated code. | |
602 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
603 } | |
604 | |
605 | |
606 void codeCache_init() { | |
607 CodeCache::initialize(); | |
608 } | |
609 | |
610 //------------------------------------------------------------------------------------------------ | |
611 | |
612 int CodeCache::number_of_nmethods_with_dependencies() { | |
613 return _number_of_nmethods_with_dependencies; | |
614 } | |
615 | |
616 void CodeCache::clear_inline_caches() { | |
617 assert_locked_or_safepoint(CodeCache_lock); | |
618 FOR_ALL_ALIVE_NMETHODS(nm) { | |
619 nm->clear_inline_caches(); | |
620 } | |
621 } | |
622 | |
623 #ifndef PRODUCT | |
624 // used to keep track of how much time is spent in mark_for_deoptimization | |
625 static elapsedTimer dependentCheckTime; | |
626 static int dependentCheckCount = 0; | |
627 #endif // PRODUCT | |
628 | |
629 | |
630 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
631 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
632 | |
633 #ifndef PRODUCT | |
634 dependentCheckTime.start(); | |
635 dependentCheckCount++; | |
636 #endif // PRODUCT | |
637 | |
638 int number_of_marked_CodeBlobs = 0; | |
639 | |
640 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
641 | |
642 // then search the interfaces this class implements looking for nmethods | |
643 // which might be dependent of the fact that an interface only had one | |
644 // implementor. | |
645 | |
646 { No_Safepoint_Verifier nsv; | |
647 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
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648 Klass* d = str.klass(); |
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649 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes); |
0 | 650 } |
651 } | |
652 | |
653 if (VerifyDependencies) { | |
654 // Turn off dependency tracing while actually testing deps. | |
655 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
656 FOR_ALL_ALIVE_NMETHODS(nm) { | |
657 if (!nm->is_marked_for_deoptimization() && | |
658 nm->check_all_dependencies()) { | |
659 ResourceMark rm; | |
660 tty->print_cr("Should have been marked for deoptimization:"); | |
661 changes.print(); | |
662 nm->print(); | |
663 nm->print_dependencies(); | |
664 } | |
665 } | |
666 } | |
667 | |
668 #ifndef PRODUCT | |
669 dependentCheckTime.stop(); | |
670 #endif // PRODUCT | |
671 | |
672 return number_of_marked_CodeBlobs; | |
673 } | |
674 | |
675 | |
676 #ifdef HOTSWAP | |
677 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
678 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
679 int number_of_marked_CodeBlobs = 0; | |
680 | |
681 // Deoptimize all methods of the evolving class itself | |
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682 Array<Method*>* old_methods = dependee->methods(); |
0 | 683 for (int i = 0; i < old_methods->length(); i++) { |
684 ResourceMark rm; | |
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685 Method* old_method = old_methods->at(i); |
0 | 686 nmethod *nm = old_method->code(); |
687 if (nm != NULL) { | |
688 nm->mark_for_deoptimization(); | |
689 number_of_marked_CodeBlobs++; | |
690 } | |
691 } | |
692 | |
693 FOR_ALL_ALIVE_NMETHODS(nm) { | |
694 if (nm->is_marked_for_deoptimization()) { | |
695 // ...Already marked in the previous pass; don't count it again. | |
696 } else if (nm->is_evol_dependent_on(dependee())) { | |
697 ResourceMark rm; | |
698 nm->mark_for_deoptimization(); | |
699 number_of_marked_CodeBlobs++; | |
700 } else { | |
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701 // flush caches in case they refer to a redefined Method* |
0 | 702 nm->clear_inline_caches(); |
703 } | |
704 } | |
705 | |
706 return number_of_marked_CodeBlobs; | |
707 } | |
708 #endif // HOTSWAP | |
709 | |
710 | |
711 // Deoptimize all methods | |
712 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
713 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
714 FOR_ALL_ALIVE_NMETHODS(nm) { | |
715 nm->mark_for_deoptimization(); | |
716 } | |
717 } | |
718 | |
719 | |
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720 int CodeCache::mark_for_deoptimization(Method* dependee) { |
0 | 721 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
722 int number_of_marked_CodeBlobs = 0; | |
723 | |
724 FOR_ALL_ALIVE_NMETHODS(nm) { | |
725 if (nm->is_dependent_on_method(dependee)) { | |
726 ResourceMark rm; | |
727 nm->mark_for_deoptimization(); | |
728 number_of_marked_CodeBlobs++; | |
729 } | |
730 } | |
731 | |
732 return number_of_marked_CodeBlobs; | |
733 } | |
734 | |
735 void CodeCache::make_marked_nmethods_zombies() { | |
736 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
737 FOR_ALL_ALIVE_NMETHODS(nm) { | |
738 if (nm->is_marked_for_deoptimization()) { | |
739 | |
740 // If the nmethod has already been made non-entrant and it can be converted | |
741 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
742 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
743 // might be "entrant" and not on the stack and so could be zombied immediately | |
744 // but we can't tell because we don't track it on stack until it becomes | |
745 // non-entrant. | |
746 | |
747 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
748 nm->make_zombie(); | |
749 } else { | |
750 nm->make_not_entrant(); | |
751 } | |
752 } | |
753 } | |
754 } | |
755 | |
756 void CodeCache::make_marked_nmethods_not_entrant() { | |
757 assert_locked_or_safepoint(CodeCache_lock); | |
758 FOR_ALL_ALIVE_NMETHODS(nm) { | |
759 if (nm->is_marked_for_deoptimization()) { | |
760 nm->make_not_entrant(); | |
761 } | |
762 } | |
763 } | |
764 | |
765 void CodeCache::verify() { | |
766 _heap->verify(); | |
767 FOR_ALL_ALIVE_BLOBS(p) { | |
768 p->verify(); | |
769 } | |
770 } | |
771 | |
10405 | 772 void CodeCache::report_codemem_full() { |
773 _codemem_full_count++; | |
774 EventCodeCacheFull event; | |
775 if (event.should_commit()) { | |
776 event.set_startAddress((u8)low_bound()); | |
777 event.set_commitedTopAddress((u8)high()); | |
778 event.set_reservedTopAddress((u8)high_bound()); | |
779 event.set_entryCount(nof_blobs()); | |
780 event.set_methodCount(nof_nmethods()); | |
781 event.set_adaptorCount(nof_adapters()); | |
782 event.set_unallocatedCapacity(unallocated_capacity()/K); | |
783 event.set_fullCount(_codemem_full_count); | |
784 event.commit(); | |
785 } | |
786 } | |
787 | |
0 | 788 //------------------------------------------------------------------------------------------------ |
789 // Non-product version | |
790 | |
791 #ifndef PRODUCT | |
792 | |
793 void CodeCache::verify_if_often() { | |
794 if (VerifyCodeCacheOften) { | |
795 _heap->verify(); | |
796 } | |
797 } | |
798 | |
989 | 799 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
800 if (PrintCodeCache2) { // Need to add a new flag | |
801 ResourceMark rm; | |
802 if (size == 0) size = cb->size(); | |
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803 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size); |
989 | 804 } |
805 } | |
806 | |
0 | 807 void CodeCache::print_internals() { |
808 int nmethodCount = 0; | |
809 int runtimeStubCount = 0; | |
810 int adapterCount = 0; | |
811 int deoptimizationStubCount = 0; | |
812 int uncommonTrapStubCount = 0; | |
813 int bufferBlobCount = 0; | |
814 int total = 0; | |
815 int nmethodAlive = 0; | |
816 int nmethodNotEntrant = 0; | |
817 int nmethodZombie = 0; | |
818 int nmethodUnloaded = 0; | |
819 int nmethodJava = 0; | |
820 int nmethodNative = 0; | |
821 int maxCodeSize = 0; | |
822 ResourceMark rm; | |
823 | |
824 CodeBlob *cb; | |
825 for (cb = first(); cb != NULL; cb = next(cb)) { | |
826 total++; | |
827 if (cb->is_nmethod()) { | |
828 nmethod* nm = (nmethod*)cb; | |
829 | |
830 if (Verbose && nm->method() != NULL) { | |
831 ResourceMark rm; | |
832 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
833 tty->print("%s", method_name); | |
834 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
835 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
836 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
837 } | |
838 | |
839 nmethodCount++; | |
840 | |
841 if(nm->is_alive()) { nmethodAlive++; } | |
842 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
843 if(nm->is_zombie()) { nmethodZombie++; } | |
844 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
845 if(nm->is_native_method()) { nmethodNative++; } | |
846 | |
847 if(nm->method() != NULL && nm->is_java_method()) { | |
848 nmethodJava++; | |
1748 | 849 if (nm->insts_size() > maxCodeSize) { |
850 maxCodeSize = nm->insts_size(); | |
0 | 851 } |
852 } | |
853 } else if (cb->is_runtime_stub()) { | |
854 runtimeStubCount++; | |
855 } else if (cb->is_deoptimization_stub()) { | |
856 deoptimizationStubCount++; | |
857 } else if (cb->is_uncommon_trap_stub()) { | |
858 uncommonTrapStubCount++; | |
859 } else if (cb->is_adapter_blob()) { | |
860 adapterCount++; | |
861 } else if (cb->is_buffer_blob()) { | |
862 bufferBlobCount++; | |
863 } | |
864 } | |
865 | |
866 int bucketSize = 512; | |
867 int bucketLimit = maxCodeSize / bucketSize + 1; | |
6197 | 868 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode); |
0 | 869 memset(buckets,0,sizeof(int) * bucketLimit); |
870 | |
871 for (cb = first(); cb != NULL; cb = next(cb)) { | |
872 if (cb->is_nmethod()) { | |
873 nmethod* nm = (nmethod*)cb; | |
874 if(nm->is_java_method()) { | |
1748 | 875 buckets[nm->insts_size() / bucketSize]++; |
0 | 876 } |
877 } | |
878 } | |
879 tty->print_cr("Code Cache Entries (total of %d)",total); | |
880 tty->print_cr("-------------------------------------------------"); | |
881 tty->print_cr("nmethods: %d",nmethodCount); | |
882 tty->print_cr("\talive: %d",nmethodAlive); | |
883 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
884 tty->print_cr("\tzombie: %d",nmethodZombie); | |
885 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
886 tty->print_cr("\tjava: %d",nmethodJava); | |
887 tty->print_cr("\tnative: %d",nmethodNative); | |
888 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
889 tty->print_cr("adapters: %d",adapterCount); | |
890 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
891 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
892 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
893 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
894 tty->print_cr("-------------------------------------------------"); | |
895 | |
896 for(int i=0; i<bucketLimit; i++) { | |
897 if(buckets[i] != 0) { | |
898 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
899 tty->fill_to(40); | |
900 tty->print_cr("%d",buckets[i]); | |
901 } | |
902 } | |
903 | |
6197 | 904 FREE_C_HEAP_ARRAY(int, buckets, mtCode); |
0 | 905 } |
906 | |
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907 #endif // !PRODUCT |
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908 |
0 | 909 void CodeCache::print() { |
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910 print_summary(tty); |
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911 |
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912 #ifndef PRODUCT |
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913 if (!Verbose) return; |
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914 |
0 | 915 CodeBlob_sizes live; |
916 CodeBlob_sizes dead; | |
917 | |
918 FOR_ALL_BLOBS(p) { | |
919 if (!p->is_alive()) { | |
920 dead.add(p); | |
921 } else { | |
922 live.add(p); | |
923 } | |
924 } | |
925 | |
926 tty->print_cr("CodeCache:"); | |
927 | |
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928 tty->print_cr("nmethod dependency checking time %f, per dependent %f", dependentCheckTime.seconds(), |
0 | 929 dependentCheckTime.seconds() / dependentCheckCount); |
930 | |
931 if (!live.is_empty()) { | |
932 live.print("live"); | |
933 } | |
934 if (!dead.is_empty()) { | |
935 dead.print("dead"); | |
936 } | |
937 | |
938 | |
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939 if (WizardMode) { |
0 | 940 // print the oop_map usage |
941 int code_size = 0; | |
942 int number_of_blobs = 0; | |
943 int number_of_oop_maps = 0; | |
944 int map_size = 0; | |
945 FOR_ALL_BLOBS(p) { | |
946 if (p->is_alive()) { | |
947 number_of_blobs++; | |
1748 | 948 code_size += p->code_size(); |
0 | 949 OopMapSet* set = p->oop_maps(); |
950 if (set != NULL) { | |
951 number_of_oop_maps += set->size(); | |
1748 | 952 map_size += set->heap_size(); |
0 | 953 } |
954 } | |
955 } | |
956 tty->print_cr("OopMaps"); | |
957 tty->print_cr(" #blobs = %d", number_of_blobs); | |
958 tty->print_cr(" code size = %d", code_size); | |
959 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
960 tty->print_cr(" map size = %d", map_size); | |
961 } | |
962 | |
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963 #endif // !PRODUCT |
0 | 964 } |
965 | |
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966 void CodeCache::print_summary(outputStream* st, bool detailed) { |
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967 size_t total = (_heap->high_boundary() - _heap->low_boundary()); |
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968 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT |
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969 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb", |
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970 total/K, (total - unallocated_capacity())/K, |
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971 maxCodeCacheUsed/K, unallocated_capacity()/K); |
1907 | 972 |
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973 if (detailed) { |
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974 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]", |
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975 p2i(_heap->low_boundary()), |
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976 p2i(_heap->high()), |
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977 p2i(_heap->high_boundary())); |
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978 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT |
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979 " adapters=" UINT32_FORMAT, |
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980 nof_blobs(), nof_nmethods(), nof_adapters()); |
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981 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ? |
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982 "enabled" : Arguments::mode() == Arguments::_int ? |
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983 "disabled (interpreter mode)" : |
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984 "disabled (not enough contiguous free space left)"); |
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985 } |
1907 | 986 } |
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987 |
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988 void CodeCache::log_state(outputStream* st) { |
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989 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'" |
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990 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'", |
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991 nof_blobs(), nof_nmethods(), nof_adapters(), |
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992 unallocated_capacity()); |
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993 } |
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994 |