Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoader.hpp @ 875:6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
Summary: Add new jvmstat counters to measure detailed class loading time
Reviewed-by: acorn, kamg
| author | mchung |
|---|---|
| date | Fri, 10 Jul 2009 11:10:00 -0700 |
| parents | a61af66fc99e |
| children | 89e0543e1737 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 // The VM class loader. | |
| 26 #include <sys/stat.h> | |
| 27 | |
| 28 | |
| 29 // Meta-index (optional, to be able to skip opening boot classpath jar files) | |
| 30 class MetaIndex: public CHeapObj { | |
| 31 private: | |
| 32 char** _meta_package_names; | |
| 33 int _num_meta_package_names; | |
| 34 public: | |
| 35 MetaIndex(char** meta_package_names, int num_meta_package_names); | |
| 36 ~MetaIndex(); | |
| 37 bool may_contain(const char* class_name); | |
| 38 }; | |
| 39 | |
| 40 | |
| 41 // Class path entry (directory or zip file) | |
| 42 | |
| 43 class ClassPathEntry: public CHeapObj { | |
| 44 private: | |
| 45 ClassPathEntry* _next; | |
| 46 public: | |
| 47 // Next entry in class path | |
| 48 ClassPathEntry* next() { return _next; } | |
| 49 void set_next(ClassPathEntry* next) { | |
| 50 // may have unlocked readers, so write atomically. | |
| 51 OrderAccess::release_store_ptr(&_next, next); | |
| 52 } | |
| 53 virtual bool is_jar_file() = 0; | |
| 54 virtual const char* name() = 0; | |
| 55 virtual bool is_lazy(); | |
| 56 // Constructor | |
| 57 ClassPathEntry(); | |
| 58 // Attempt to locate file_name through this class path entry. | |
| 59 // Returns a class file parsing stream if successfull. | |
| 60 virtual ClassFileStream* open_stream(const char* name) = 0; | |
| 61 // Debugging | |
| 62 NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;) | |
| 63 NOT_PRODUCT(virtual bool is_rt_jar() = 0;) | |
| 64 }; | |
| 65 | |
| 66 | |
| 67 class ClassPathDirEntry: public ClassPathEntry { | |
| 68 private: | |
| 69 char* _dir; // Name of directory | |
| 70 public: | |
| 71 bool is_jar_file() { return false; } | |
| 72 const char* name() { return _dir; } | |
| 73 ClassPathDirEntry(char* dir); | |
| 74 ClassFileStream* open_stream(const char* name); | |
| 75 // Debugging | |
| 76 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 77 NOT_PRODUCT(bool is_rt_jar();) | |
| 78 }; | |
| 79 | |
| 80 | |
| 81 // Type definitions for zip file and zip file entry | |
| 82 typedef void* jzfile; | |
| 83 typedef struct { | |
| 84 char *name; /* entry name */ | |
| 85 jlong time; /* modification time */ | |
| 86 jlong size; /* size of uncompressed data */ | |
| 87 jlong csize; /* size of compressed data (zero if uncompressed) */ | |
| 88 jint crc; /* crc of uncompressed data */ | |
| 89 char *comment; /* optional zip file comment */ | |
| 90 jbyte *extra; /* optional extra data */ | |
| 91 jlong pos; /* position of LOC header (if negative) or data */ | |
| 92 } jzentry; | |
| 93 | |
| 94 | |
| 95 class ClassPathZipEntry: public ClassPathEntry { | |
| 96 private: | |
| 97 jzfile* _zip; // The zip archive | |
| 98 char* _zip_name; // Name of zip archive | |
| 99 public: | |
| 100 bool is_jar_file() { return true; } | |
| 101 const char* name() { return _zip_name; } | |
| 102 ClassPathZipEntry(jzfile* zip, const char* zip_name); | |
| 103 ~ClassPathZipEntry(); | |
| 104 ClassFileStream* open_stream(const char* name); | |
| 105 void contents_do(void f(const char* name, void* context), void* context); | |
| 106 // Debugging | |
| 107 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 108 NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version | |
| 109 NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version | |
| 110 NOT_PRODUCT(bool is_rt_jar();) | |
| 111 NOT_PRODUCT(bool is_rt_jar12();) | |
| 112 NOT_PRODUCT(bool is_rt_jar13();) | |
| 113 }; | |
| 114 | |
| 115 | |
| 116 // For lazier loading of boot class path entries | |
| 117 class LazyClassPathEntry: public ClassPathEntry { | |
| 118 private: | |
| 119 char* _path; // dir or file | |
| 120 struct stat _st; | |
| 121 MetaIndex* _meta_index; | |
| 122 volatile ClassPathEntry* _resolved_entry; | |
| 123 ClassPathEntry* resolve_entry(); | |
| 124 public: | |
| 125 bool is_jar_file(); | |
| 126 const char* name() { return _path; } | |
| 127 LazyClassPathEntry(char* path, struct stat st); | |
| 128 ClassFileStream* open_stream(const char* name); | |
| 129 void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; } | |
| 130 virtual bool is_lazy(); | |
| 131 // Debugging | |
| 132 NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);) | |
| 133 NOT_PRODUCT(bool is_rt_jar();) | |
| 134 }; | |
| 135 | |
| 136 class PackageHashtable; | |
| 137 class PackageInfo; | |
| 138 class HashtableBucket; | |
| 139 | |
| 140 class ClassLoader: AllStatic { | |
| 141 public: | |
| 142 enum SomeConstants { | |
| 143 package_hash_table_size = 31 // Number of buckets | |
| 144 }; | |
| 145 private: | |
| 146 friend class LazyClassPathEntry; | |
| 147 | |
| 148 // Performance counters | |
| 149 static PerfCounter* _perf_accumulated_time; | |
| 150 static PerfCounter* _perf_classes_inited; | |
| 151 static PerfCounter* _perf_class_init_time; | |
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152 static PerfCounter* _perf_class_init_selftime; |
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153 static PerfCounter* _perf_classes_verified; |
| 0 | 154 static PerfCounter* _perf_class_verify_time; |
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155 static PerfCounter* _perf_class_verify_selftime; |
| 0 | 156 static PerfCounter* _perf_classes_linked; |
| 157 static PerfCounter* _perf_class_link_time; | |
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158 static PerfCounter* _perf_class_link_selftime; |
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159 static PerfCounter* _perf_class_parse_time; |
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160 static PerfCounter* _perf_class_parse_selftime; |
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161 static PerfCounter* _perf_sys_class_lookup_time; |
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162 static PerfCounter* _perf_shared_classload_time; |
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163 static PerfCounter* _perf_sys_classload_time; |
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164 static PerfCounter* _perf_app_classload_time; |
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165 static PerfCounter* _perf_app_classload_selftime; |
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166 static PerfCounter* _perf_app_classload_count; |
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167 static PerfCounter* _perf_define_appclasses; |
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168 static PerfCounter* _perf_define_appclass_time; |
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169 static PerfCounter* _perf_define_appclass_selftime; |
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170 static PerfCounter* _perf_app_classfile_bytes_read; |
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171 static PerfCounter* _perf_sys_classfile_bytes_read; |
| 0 | 172 |
| 173 static PerfCounter* _sync_systemLoaderLockContentionRate; | |
| 174 static PerfCounter* _sync_nonSystemLoaderLockContentionRate; | |
| 175 static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter; | |
| 176 static PerfCounter* _sync_JVMDefineClassLockFreeCounter; | |
| 177 static PerfCounter* _sync_JNIDefineClassLockFreeCounter; | |
| 178 | |
| 179 static PerfCounter* _unsafe_defineClassCallCounter; | |
| 180 static PerfCounter* _isUnsyncloadClass; | |
| 181 static PerfCounter* _load_instance_class_failCounter; | |
| 182 | |
| 183 // First entry in linked list of ClassPathEntry instances | |
| 184 static ClassPathEntry* _first_entry; | |
| 185 // Last entry in linked list of ClassPathEntry instances | |
| 186 static ClassPathEntry* _last_entry; | |
| 187 // Hash table used to keep track of loaded packages | |
| 188 static PackageHashtable* _package_hash_table; | |
| 189 static const char* _shared_archive; | |
| 190 | |
| 191 // Hash function | |
| 192 static unsigned int hash(const char *s, int n); | |
| 193 // Returns the package file name corresponding to the specified package | |
| 194 // or class name, or null if not found. | |
| 195 static PackageInfo* lookup_package(const char *pkgname); | |
| 196 // Adds a new package entry for the specified class or package name and | |
| 197 // corresponding directory or jar file name. | |
| 198 static bool add_package(const char *pkgname, int classpath_index, TRAPS); | |
| 199 | |
| 200 // Initialization | |
| 201 static void setup_meta_index(); | |
| 202 static void setup_bootstrap_search_path(); | |
| 203 static void load_zip_library(); | |
| 204 static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy); | |
| 205 | |
| 206 // Canonicalizes path names, so strcmp will work properly. This is mainly | |
| 207 // to avoid confusing the zip library | |
| 208 static bool get_canonical_path(char* orig, char* out, int len); | |
| 209 public: | |
| 210 // Used by the kernel jvm. | |
| 211 static void update_class_path_entry_list(const char *path, | |
| 212 bool check_for_duplicates); | |
| 213 static void print_bootclasspath(); | |
| 214 | |
| 215 // Timing | |
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216 static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; } |
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217 static PerfCounter* perf_classes_inited() { return _perf_classes_inited; } |
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218 static PerfCounter* perf_class_init_time() { return _perf_class_init_time; } |
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219 static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; } |
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220 static PerfCounter* perf_classes_verified() { return _perf_classes_verified; } |
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221 static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; } |
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222 static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; } |
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223 static PerfCounter* perf_classes_linked() { return _perf_classes_linked; } |
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224 static PerfCounter* perf_class_link_time() { return _perf_class_link_time; } |
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225 static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; } |
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226 static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; } |
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227 static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; } |
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228 static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; } |
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229 static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; } |
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230 static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; } |
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231 static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; } |
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232 static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; } |
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233 static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; } |
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234 static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; } |
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235 static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; } |
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236 static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; } |
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237 static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; } |
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238 static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; } |
| 0 | 239 |
| 240 // Record how often system loader lock object is contended | |
| 241 static PerfCounter* sync_systemLoaderLockContentionRate() { | |
| 242 return _sync_systemLoaderLockContentionRate; | |
| 243 } | |
| 244 | |
| 245 // Record how often non system loader lock object is contended | |
| 246 static PerfCounter* sync_nonSystemLoaderLockContentionRate() { | |
| 247 return _sync_nonSystemLoaderLockContentionRate; | |
| 248 } | |
| 249 | |
| 250 // Record how many calls to JVM_FindLoadedClass w/o holding a lock | |
| 251 static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() { | |
| 252 return _sync_JVMFindLoadedClassLockFreeCounter; | |
| 253 } | |
| 254 | |
| 255 // Record how many calls to JVM_DefineClass w/o holding a lock | |
| 256 static PerfCounter* sync_JVMDefineClassLockFreeCounter() { | |
| 257 return _sync_JVMDefineClassLockFreeCounter; | |
| 258 } | |
| 259 | |
| 260 // Record how many calls to jni_DefineClass w/o holding a lock | |
| 261 static PerfCounter* sync_JNIDefineClassLockFreeCounter() { | |
| 262 return _sync_JNIDefineClassLockFreeCounter; | |
| 263 } | |
| 264 | |
| 265 // Record how many calls to Unsafe_DefineClass | |
| 266 static PerfCounter* unsafe_defineClassCallCounter() { | |
| 267 return _unsafe_defineClassCallCounter; | |
| 268 } | |
| 269 | |
| 270 // Record how many times SystemDictionary::load_instance_class call | |
| 271 // fails with linkageError when Unsyncloadclass flag is set. | |
| 272 static PerfCounter* load_instance_class_failCounter() { | |
| 273 return _load_instance_class_failCounter; | |
| 274 } | |
| 275 | |
| 276 // Load individual .class file | |
| 277 static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS); | |
| 278 | |
| 279 // If the specified package has been loaded by the system, then returns | |
| 280 // the name of the directory or ZIP file that the package was loaded from. | |
| 281 // Returns null if the package was not loaded. | |
| 282 // Note: The specified name can either be the name of a class or package. | |
| 283 // If a package name is specified, then it must be "/"-separator and also | |
| 284 // end with a trailing "/". | |
| 285 static oop get_system_package(const char* name, TRAPS); | |
| 286 | |
| 287 // Returns an array of Java strings representing all of the currently | |
| 288 // loaded system packages. | |
| 289 // Note: The package names returned are "/"-separated and end with a | |
| 290 // trailing "/". | |
| 291 static objArrayOop get_system_packages(TRAPS); | |
| 292 | |
| 293 // Initialization | |
| 294 static void initialize(); | |
| 295 static void create_package_info_table(); | |
| 296 static void create_package_info_table(HashtableBucket *t, int length, | |
| 297 int number_of_entries); | |
| 298 static int compute_Object_vtable(); | |
| 299 | |
| 300 static ClassPathEntry* classpath_entry(int n) { | |
| 301 ClassPathEntry* e = ClassLoader::_first_entry; | |
| 302 while (--n >= 0) { | |
| 303 assert(e != NULL, "Not that many classpath entries."); | |
| 304 e = e->next(); | |
| 305 } | |
| 306 return e; | |
| 307 } | |
| 308 | |
| 309 // Sharing dump and restore | |
| 310 static void copy_package_info_buckets(char** top, char* end); | |
| 311 static void copy_package_info_table(char** top, char* end); | |
| 312 | |
| 313 // VM monitoring and management support | |
| 314 static jlong classloader_time_ms(); | |
| 315 static jlong class_method_total_size(); | |
| 316 static jlong class_init_count(); | |
| 317 static jlong class_init_time_ms(); | |
| 318 static jlong class_verify_time_ms(); | |
| 319 static jlong class_link_count(); | |
| 320 static jlong class_link_time_ms(); | |
| 321 | |
| 322 // indicates if class path already contains a entry (exact match by name) | |
| 323 static bool contains_entry(ClassPathEntry* entry); | |
| 324 | |
| 325 // adds a class path list | |
| 326 static void add_to_list(ClassPathEntry* new_entry); | |
| 327 | |
| 328 // creates a class path zip entry (returns NULL if JAR file cannot be opened) | |
| 329 static ClassPathZipEntry* create_class_path_zip_entry(const char *apath); | |
| 330 | |
| 331 // Debugging | |
| 332 static void verify() PRODUCT_RETURN; | |
| 333 | |
| 334 // Force compilation of all methods in all classes in bootstrap class path (stress test) | |
| 335 #ifndef PRODUCT | |
| 336 private: | |
| 337 static int _compile_the_world_counter; | |
| 338 public: | |
| 339 static void compile_the_world(); | |
| 340 static void compile_the_world_in(char* name, Handle loader, TRAPS); | |
| 341 static int compile_the_world_counter() { return _compile_the_world_counter; } | |
| 342 #endif //PRODUCT | |
| 343 }; | |
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344 |
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345 // PerfClassTraceTime is used to measure time for class loading related events. |
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346 // This class tracks cumulative time and exclusive time for specific event types. |
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347 // During the execution of one event, other event types (e.g. class loading and |
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348 // resolution) as well as recursive calls of the same event type could happen. |
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349 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive) |
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350 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime |
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351 // instances have been created as multiple events are happening. |
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352 class PerfClassTraceTime { |
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353 public: |
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354 enum { |
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355 CLASS_LOAD = 0, |
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356 PARSE_CLASS = 1, |
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357 CLASS_LINK = 2, |
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358 CLASS_VERIFY = 3, |
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359 CLASS_CLINIT = 4, |
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360 DEFINE_CLASS = 5, |
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361 EVENT_TYPE_COUNT = 6 |
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362 }; |
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363 protected: |
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364 // _t tracks time from initialization to destruction of this timer instance |
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365 // including time for all other event types, and recursive calls of this type. |
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366 // When a timer is called recursively, the elapsedTimer _t would not be used. |
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367 elapsedTimer _t; |
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368 PerfLongCounter* _timep; |
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369 PerfLongCounter* _selftimep; |
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370 PerfLongCounter* _eventp; |
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371 // pointer to thread-local recursion counter and timer array |
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372 // The thread_local timers track cumulative time for specific event types |
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373 // exclusive of time for other event types, but including recursive calls |
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374 // of the same type. |
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375 int* _recursion_counters; |
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376 elapsedTimer* _timers; |
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377 int _event_type; |
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378 int _prev_active_event; |
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379 |
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380 public: |
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381 |
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382 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ |
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383 PerfLongCounter* selftimep, /* counter incremented with exclusive time */ |
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384 PerfLongCounter* eventp, /* event counter */ |
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385 int* recursion_counters, /* thread-local recursion counter array */ |
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386 elapsedTimer* timers, /* thread-local timer array */ |
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387 int type /* event type */ ) : |
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388 _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) { |
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389 initialize(); |
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390 } |
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391 |
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392 inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ |
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393 elapsedTimer* timers, /* thread-local timer array */ |
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394 int type /* event type */ ) : |
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395 _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) { |
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396 initialize(); |
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397 } |
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398 |
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399 void initialize() { |
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400 if (!UsePerfData) return; |
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401 |
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402 if (_eventp != NULL) { |
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403 // increment the event counter |
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404 _eventp->inc(); |
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405 } |
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406 |
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407 // stop the current active thread-local timer to measure inclusive time |
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408 _prev_active_event = -1; |
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409 for (int i=0; i < EVENT_TYPE_COUNT; i++) { |
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410 if (_timers[i].is_active()) { |
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411 assert(_prev_active_event == -1, "should have only one active timer"); |
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412 _prev_active_event = i; |
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413 _timers[i].stop(); |
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414 } |
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415 } |
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416 |
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417 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { |
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418 // start the inclusive timer if not recursively called |
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419 _t.start(); |
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420 } |
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421 |
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422 // start thread-local timer of the given event type |
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423 if (!_timers[_event_type].is_active()) { |
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424 _timers[_event_type].start(); |
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425 } |
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426 } |
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427 |
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428 inline void suspend() { _t.stop(); _timers[_event_type].stop(); } |
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429 inline void resume() { _t.start(); _timers[_event_type].start(); } |
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430 |
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431 ~PerfClassTraceTime() { |
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432 if (!UsePerfData) return; |
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433 |
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434 // stop the thread-local timer as the event completes |
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435 // and resume the thread-local timer of the event next on the stack |
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436 _timers[_event_type].stop(); |
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437 jlong selftime = _timers[_event_type].ticks(); |
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438 |
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439 if (_prev_active_event >= 0) { |
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440 _timers[_prev_active_event].start(); |
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441 } |
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442 |
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443 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; |
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444 |
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445 // increment the counters only on the leaf call |
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446 _t.stop(); |
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447 _timep->inc(_t.ticks()); |
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448 if (_selftimep != NULL) { |
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449 _selftimep->inc(selftime); |
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450 } |
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451 // add all class loading related event selftime to the accumulated time counter |
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452 ClassLoader::perf_accumulated_time()->inc(selftime); |
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453 |
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454 // reset the timer |
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455 _timers[_event_type].reset(); |
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456 } |
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457 }; |
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458 |