Mercurial > hg > truffle
annotate src/share/vm/runtime/perfData.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 2001-2006 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 /* jvmstat global and subsystem counter name space - enumeration value | |
| 26 * serve as an index into the PerfDataManager::_name_space[] array | |
| 27 * containing the corresponding name space string. Only the top level | |
| 28 * subsystem name spaces are represented here. | |
| 29 */ | |
| 30 enum CounterNS { | |
| 31 // top level name spaces | |
| 32 JAVA_NS, | |
| 33 COM_NS, | |
| 34 SUN_NS, | |
| 35 // subsystem name spaces | |
| 36 JAVA_GC, // Garbage Collection name spaces | |
| 37 COM_GC, | |
| 38 SUN_GC, | |
| 39 JAVA_CI, // Compiler name spaces | |
| 40 COM_CI, | |
| 41 SUN_CI, | |
| 42 JAVA_CLS, // Class Loader name spaces | |
| 43 COM_CLS, | |
| 44 SUN_CLS, | |
| 45 JAVA_RT, // Runtime name spaces | |
| 46 COM_RT, | |
| 47 SUN_RT, | |
| 48 JAVA_OS, // Operating System name spaces | |
| 49 COM_OS, | |
| 50 SUN_OS, | |
| 51 JAVA_THREADS, // Threads System name spaces | |
| 52 COM_THREADS, | |
| 53 SUN_THREADS, | |
| 54 JAVA_PROPERTY, // Java Property name spaces | |
| 55 COM_PROPERTY, | |
| 56 SUN_PROPERTY, | |
| 57 NULL_NS, | |
| 58 COUNTERNS_LAST = NULL_NS | |
| 59 }; | |
| 60 | |
| 61 /* | |
| 62 * Classes to support access to production performance data | |
| 63 * | |
| 64 * The PerfData class structure is provided for creation, access, and update | |
| 65 * of performance data (a.k.a. instrumentation) in a specific memory region | |
| 66 * which is possibly accessible as shared memory. Although not explicitly | |
| 67 * prevented from doing so, developers should not use the values returned | |
| 68 * by accessor methods to make algorithmic decisions as they are potentially | |
| 69 * extracted from a shared memory region. Although any shared memory region | |
| 70 * created is with appropriate access restrictions, allowing read-write access | |
| 71 * only to the principal that created the JVM, it is believed that a the | |
| 72 * shared memory region facilitates an easier attack path than attacks | |
| 73 * launched through mechanisms such as /proc. For this reason, it is | |
| 74 * recommended that data returned by PerfData accessor methods be used | |
| 75 * cautiously. | |
| 76 * | |
| 77 * There are three variability classifications of performance data | |
| 78 * Constants - value is written to the PerfData memory once, on creation | |
| 79 * Variables - value is modifiable, with no particular restrictions | |
| 80 * Counters - value is monotonically changing (increasing or decreasing) | |
| 81 * | |
| 82 * The performance data items can also have various types. The class | |
| 83 * hierarchy and the structure of the memory region are designed to | |
| 84 * accommodate new types as they are needed. Types are specified in | |
| 85 * terms of Java basic types, which accommodates client applications | |
| 86 * written in the Java programming language. The class hierarchy is: | |
| 87 * | |
| 88 * - PerfData (Abstract) | |
| 89 * - PerfLong (Abstract) | |
| 90 * - PerfLongConstant (alias: PerfConstant) | |
| 91 * - PerfLongVariant (Abstract) | |
| 92 * - PerfLongVariable (alias: PerfVariable) | |
| 93 * - PerfLongCounter (alias: PerfCounter) | |
| 94 * | |
| 95 * - PerfByteArray (Abstract) | |
| 96 * - PerfString (Abstract) | |
| 97 * - PerfStringVariable | |
| 98 * - PerfStringConstant | |
| 99 * | |
| 100 * | |
| 101 * As seen in the class hierarchy, the initially supported types are: | |
| 102 * | |
| 103 * Long - performance data holds a Java long type | |
| 104 * ByteArray - performance data holds an array of Java bytes | |
| 105 * used for holding C++ char arrays. | |
| 106 * | |
| 107 * The String type is derived from the ByteArray type. | |
| 108 * | |
| 109 * A PerfData subtype is not required to provide an implementation for | |
| 110 * each variability classification. For example, the String type provides | |
| 111 * Variable and Constant variablility classifications in the PerfStringVariable | |
| 112 * and PerfStringConstant classes, but does not provide a counter type. | |
| 113 * | |
| 114 * Performance data are also described by a unit of measure. Units allow | |
| 115 * client applications to make reasonable decisions on how to treat | |
| 116 * performance data generically, preventing the need to hard-code the | |
| 117 * specifics of a particular data item in client applications. The current | |
| 118 * set of units are: | |
| 119 * | |
| 120 * None - the data has no units of measure | |
| 121 * Bytes - data is measured in bytes | |
| 122 * Ticks - data is measured in clock ticks | |
| 123 * Events - data is measured in events. For example, | |
| 124 * the number of garbage collection events or the | |
| 125 * number of methods compiled. | |
| 126 * String - data is not numerical. For example, | |
| 127 * the java command line options | |
| 128 * Hertz - data is a frequency | |
| 129 * | |
| 130 * The performance counters also provide a support attribute, indicating | |
| 131 * the stability of the counter as a programmatic interface. The support | |
| 132 * level is also implied by the name space in which the counter is created. | |
| 133 * The counter name space support conventions follow the Java package, class, | |
| 134 * and property support conventions: | |
| 135 * | |
| 136 * java.* - stable, supported interface | |
| 137 * com.sun.* - unstable, supported interface | |
| 138 * sun.* - unstable, unsupported interface | |
| 139 * | |
| 140 * In the above context, unstable is a measure of the interface support | |
| 141 * level, not the implementation stability level. | |
| 142 * | |
| 143 * Currently, instances of PerfData subtypes are considered to have | |
| 144 * a life time equal to that of the VM and are managed by the | |
| 145 * PerfDataManager class. All constructors for the PerfData class and | |
| 146 * its subtypes have protected constructors. Creation of PerfData | |
| 147 * instances is performed by invoking various create methods on the | |
| 148 * PerfDataManager class. Users should not attempt to delete these | |
| 149 * instances as the PerfDataManager class expects to perform deletion | |
| 150 * operations on exit of the VM. | |
| 151 * | |
| 152 * Examples: | |
| 153 * | |
| 154 * Creating performance counter that holds a monotonically increasing | |
| 155 * long data value with units specified in U_Bytes in the "java.gc.*" | |
| 156 * name space. | |
| 157 * | |
| 158 * PerfLongCounter* foo_counter; | |
| 159 * | |
| 160 * foo_counter = PerfDataManager::create_long_counter(JAVA_GC, "foo", | |
| 161 * PerfData::U_Bytes, | |
| 162 * optionalInitialValue, | |
| 163 * CHECK); | |
| 164 * foo_counter->inc(); | |
| 165 * | |
| 166 * Creating a performance counter that holds a variably change long | |
| 167 * data value with untis specified in U_Bytes in the "com.sun.ci | |
| 168 * name space. | |
| 169 * | |
| 170 * PerfLongVariable* bar_varible; | |
| 171 * bar_variable = PerfDataManager::create_long_variable(COM_CI, "bar", | |
| 172 .* PerfData::U_Bytes, | |
| 173 * optionalInitialValue, | |
| 174 * CHECK); | |
| 175 * | |
| 176 * bar_variable->inc(); | |
| 177 * bar_variable->set_value(0); | |
| 178 * | |
| 179 * Creating a performance counter that holds a constant string value in | |
| 180 * the "sun.cls.*" name space. | |
| 181 * | |
| 182 * PerfDataManager::create_string_constant(SUN_CLS, "foo", string, CHECK); | |
| 183 * | |
| 184 * Although the create_string_constant() factory method returns a pointer | |
| 185 * to the PerfStringConstant object, it can safely be ignored. Developers | |
| 186 * are not encouraged to access the string constant's value via this | |
| 187 * pointer at this time due to security concerns. | |
| 188 * | |
| 189 * Creating a performance counter in an arbitrary name space that holds a | |
| 190 * value that is sampled by the StatSampler periodic task. | |
| 191 * | |
| 192 * PerfDataManager::create_counter("foo.sampled", PerfData::U_Events, | |
| 193 * &my_jlong, CHECK); | |
| 194 * | |
| 195 * In this example, the PerfData pointer can be ignored as the caller | |
| 196 * is relying on the StatSampler PeriodicTask to sample the given | |
| 197 * address at a regular interval. The interval is defined by the | |
| 198 * PerfDataSamplingInterval global variable, and is applyied on | |
| 199 * a system wide basis, not on an per-counter basis. | |
| 200 * | |
| 201 * Creating a performance counter in an arbitrary name space that utilizes | |
| 202 * a helper object to return a value to the StatSampler via the take_sample() | |
| 203 * method. | |
| 204 * | |
| 205 * class MyTimeSampler : public PerfLongSampleHelper { | |
| 206 * public: | |
| 207 * jlong take_sample() { return os::elapsed_counter(); } | |
| 208 * }; | |
| 209 * | |
| 210 * PerfDataManager::create_counter(SUN_RT, "helped", | |
| 211 * PerfData::U_Ticks, | |
| 212 * new MyTimeSampler(), CHECK); | |
| 213 * | |
| 214 * In this example, a subtype of PerfLongSampleHelper is instantiated | |
| 215 * and its take_sample() method is overridden to perform whatever | |
| 216 * operation is necessary to generate the data sample. This method | |
| 217 * will be called by the StatSampler at a regular interval, defined | |
| 218 * by the PerfDataSamplingInterval global variable. | |
| 219 * | |
| 220 * As before, PerfSampleHelper is an alias for PerfLongSampleHelper. | |
| 221 * | |
| 222 * For additional uses of PerfData subtypes, see the utility classes | |
| 223 * PerfTraceTime and PerfTraceTimedEvent below. | |
| 224 * | |
| 225 * Always-on non-sampled counters can be created independent of | |
| 226 * the UsePerfData flag. Counters will be created on the c-heap | |
| 227 * if UsePerfData is false. | |
| 228 * | |
| 229 * Until further noice, all PerfData objects should be created and | |
| 230 * manipulated within a guarded block. The guard variable is | |
| 231 * UsePerfData, a product flag set to true by default. This flag may | |
| 232 * be removed from the product in the future. | |
| 233 * | |
| 234 */ | |
| 235 class PerfData : public CHeapObj { | |
| 236 | |
| 237 friend class StatSampler; // for access to protected void sample() | |
| 238 friend class PerfDataManager; // for access to protected destructor | |
| 239 | |
| 240 public: | |
| 241 | |
| 242 // the Variability enum must be kept in synchronization with the | |
| 243 // the com.sun.hotspot.perfdata.Variability class | |
| 244 enum Variability { | |
| 245 V_Constant = 1, | |
| 246 V_Monotonic = 2, | |
| 247 V_Variable = 3, | |
| 248 V_last = V_Variable | |
| 249 }; | |
| 250 | |
| 251 // the Units enum must be kept in synchronization with the | |
| 252 // the com.sun.hotspot.perfdata.Units class | |
| 253 enum Units { | |
| 254 U_None = 1, | |
| 255 U_Bytes = 2, | |
| 256 U_Ticks = 3, | |
| 257 U_Events = 4, | |
| 258 U_String = 5, | |
| 259 U_Hertz = 6, | |
| 260 U_Last = U_Hertz | |
| 261 }; | |
| 262 | |
| 263 // Miscellaneous flags | |
| 264 enum Flags { | |
| 265 F_None = 0x0, | |
| 266 F_Supported = 0x1 // interface is supported - java.* and com.sun.* | |
| 267 }; | |
| 268 | |
| 269 private: | |
| 270 char* _name; | |
| 271 Variability _v; | |
| 272 Units _u; | |
| 273 bool _on_c_heap; | |
| 274 Flags _flags; | |
| 275 | |
| 276 PerfDataEntry* _pdep; | |
| 277 | |
| 278 protected: | |
| 279 | |
| 280 void *_valuep; | |
| 281 | |
| 282 PerfData(CounterNS ns, const char* name, Units u, Variability v); | |
| 283 ~PerfData(); | |
| 284 | |
| 285 // create the entry for the PerfData item in the PerfData memory region. | |
| 286 // this region is maintained separately from the PerfData objects to | |
| 287 // facilitate its use by external processes. | |
| 288 void create_entry(BasicType dtype, size_t dsize, size_t dlen = 0); | |
| 289 | |
| 290 // sample the data item given at creation time and write its value | |
| 291 // into the its corresponding PerfMemory location. | |
| 292 virtual void sample() = 0; | |
| 293 | |
| 294 public: | |
| 295 | |
| 296 // returns a boolean indicating the validity of this object. | |
| 297 // the object is valid if and only if memory in PerfMemory | |
| 298 // region was successfully allocated. | |
| 299 inline bool is_valid() { return _valuep != NULL; } | |
| 300 | |
| 301 // returns a boolean indicating whether the underlying object | |
| 302 // was allocated in the PerfMemory region or on the C heap. | |
| 303 inline bool is_on_c_heap() { return _on_c_heap; } | |
| 304 | |
| 305 // returns a pointer to a char* containing the name of the item. | |
| 306 // The pointer returned is the pointer to a copy of the name | |
| 307 // passed to the constructor, not the pointer to the name in the | |
| 308 // PerfData memory region. This redundancy is maintained for | |
| 309 // security reasons as the PerfMemory region may be in shared | |
| 310 // memory. | |
| 311 const char* name() { return _name; } | |
| 312 | |
| 313 // returns the variability classification associated with this item | |
| 314 Variability variability() { return _v; } | |
| 315 | |
| 316 // returns the units associated with this item. | |
| 317 Units units() { return _u; } | |
| 318 | |
| 319 // returns the flags associated with this item. | |
| 320 Flags flags() { return _flags; } | |
| 321 | |
| 322 // returns the address of the data portion of the item in the | |
| 323 // PerfData memory region. | |
| 324 inline void* get_address() { return _valuep; } | |
| 325 | |
| 326 // returns the value of the data portion of the item in the | |
| 327 // PerfData memory region formatted as a string. | |
| 328 virtual int format(char* cp, int length) = 0; | |
| 329 }; | |
| 330 | |
| 331 /* | |
| 332 * PerfLongSampleHelper, and its alias PerfSamplerHelper, is a base class | |
| 333 * for helper classes that rely upon the StatSampler periodic task to | |
| 334 * invoke the take_sample() method and write the value returned to its | |
| 335 * appropriate location in the PerfData memory region. | |
| 336 */ | |
| 337 class PerfLongSampleHelper : public CHeapObj { | |
| 338 public: | |
| 339 virtual jlong take_sample() = 0; | |
| 340 }; | |
| 341 | |
| 342 typedef PerfLongSampleHelper PerfSampleHelper; | |
| 343 | |
| 344 | |
| 345 /* | |
| 346 * PerfLong is the base class for the various Long PerfData subtypes. | |
| 347 * it contains implementation details that are common among its derived | |
| 348 * types. | |
| 349 */ | |
| 350 class PerfLong : public PerfData { | |
| 351 | |
| 352 protected: | |
| 353 | |
| 354 PerfLong(CounterNS ns, const char* namep, Units u, Variability v); | |
| 355 | |
| 356 public: | |
| 357 int format(char* buffer, int length); | |
| 358 | |
| 359 // returns the value of the data portion of the item in the | |
| 360 // PerfData memory region. | |
| 361 inline jlong get_value() { return *(jlong*)_valuep; } | |
| 362 }; | |
| 363 | |
| 364 /* | |
| 365 * The PerfLongConstant class, and its alias PerfConstant, implement | |
| 366 * a PerfData subtype that holds a jlong data value that is set upon | |
| 367 * creation of an instance of this class. This class provides no | |
| 368 * methods for changing the data value stored in PerfData memory region. | |
| 369 */ | |
| 370 class PerfLongConstant : public PerfLong { | |
| 371 | |
| 372 friend class PerfDataManager; // for access to protected constructor | |
| 373 | |
| 374 private: | |
| 375 // hide sample() - no need to sample constants | |
| 376 void sample() { } | |
| 377 | |
| 378 protected: | |
| 379 | |
| 380 PerfLongConstant(CounterNS ns, const char* namep, Units u, | |
| 381 jlong initial_value=0) | |
| 382 : PerfLong(ns, namep, u, V_Constant) { | |
| 383 | |
| 384 if (is_valid()) *(jlong*)_valuep = initial_value; | |
| 385 } | |
| 386 }; | |
| 387 | |
| 388 typedef PerfLongConstant PerfConstant; | |
| 389 | |
| 390 /* | |
| 391 * The PerfLongVariant class, and its alias PerfVariant, implement | |
| 392 * a PerfData subtype that holds a jlong data value that can be modified | |
| 393 * in an unrestricted manner. This class provides the implementation details | |
| 394 * for common functionality among its derived types. | |
| 395 */ | |
| 396 class PerfLongVariant : public PerfLong { | |
| 397 | |
| 398 protected: | |
| 399 jlong* _sampled; | |
| 400 PerfLongSampleHelper* _sample_helper; | |
| 401 | |
| 402 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
| 403 jlong initial_value=0) | |
| 404 : PerfLong(ns, namep, u, v) { | |
| 405 if (is_valid()) *(jlong*)_valuep = initial_value; | |
| 406 } | |
| 407 | |
| 408 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
| 409 jlong* sampled); | |
| 410 | |
| 411 PerfLongVariant(CounterNS ns, const char* namep, Units u, Variability v, | |
| 412 PerfLongSampleHelper* sample_helper); | |
| 413 | |
| 414 void sample(); | |
| 415 | |
| 416 public: | |
| 417 inline void inc() { (*(jlong*)_valuep)++; } | |
| 418 inline void inc(jlong val) { (*(jlong*)_valuep) += val; } | |
| 419 inline void add(jlong val) { (*(jlong*)_valuep) += val; } | |
| 420 }; | |
| 421 | |
| 422 /* | |
| 423 * The PerfLongCounter class, and its alias PerfCounter, implement | |
| 424 * a PerfData subtype that holds a jlong data value that can (should) | |
| 425 * be modified in a monotonic manner. The inc(jlong) and add(jlong) | |
| 426 * methods can be passed negative values to implement a monotonically | |
| 427 * decreasing value. However, we rely upon the programmer to honor | |
| 428 * the notion that this counter always moves in the same direction - | |
| 429 * either increasing or decreasing. | |
| 430 */ | |
| 431 class PerfLongCounter : public PerfLongVariant { | |
| 432 | |
| 433 friend class PerfDataManager; // for access to protected constructor | |
| 434 | |
| 435 protected: | |
| 436 | |
| 437 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
| 438 jlong initial_value=0) | |
| 439 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
| 440 initial_value) { } | |
| 441 | |
| 442 PerfLongCounter(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
| 443 : PerfLongVariant(ns, namep, u, V_Monotonic, sampled) { } | |
| 444 | |
| 445 PerfLongCounter(CounterNS ns, const char* namep, Units u, | |
| 446 PerfLongSampleHelper* sample_helper) | |
| 447 : PerfLongVariant(ns, namep, u, V_Monotonic, | |
| 448 sample_helper) { } | |
| 449 }; | |
| 450 | |
| 451 typedef PerfLongCounter PerfCounter; | |
| 452 | |
| 453 /* | |
| 454 * The PerfLongVariable class, and its alias PerfVariable, implement | |
| 455 * a PerfData subtype that holds a jlong data value that can | |
| 456 * be modified in an unrestricted manner. | |
| 457 */ | |
| 458 class PerfLongVariable : public PerfLongVariant { | |
| 459 | |
| 460 friend class PerfDataManager; // for access to protected constructor | |
| 461 | |
| 462 protected: | |
| 463 | |
| 464 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
| 465 jlong initial_value=0) | |
| 466 : PerfLongVariant(ns, namep, u, V_Variable, | |
| 467 initial_value) { } | |
| 468 | |
| 469 PerfLongVariable(CounterNS ns, const char* namep, Units u, jlong* sampled) | |
| 470 : PerfLongVariant(ns, namep, u, V_Variable, sampled) { } | |
| 471 | |
| 472 PerfLongVariable(CounterNS ns, const char* namep, Units u, | |
| 473 PerfLongSampleHelper* sample_helper) | |
| 474 : PerfLongVariant(ns, namep, u, V_Variable, | |
| 475 sample_helper) { } | |
| 476 | |
| 477 public: | |
| 478 inline void set_value(jlong val) { (*(jlong*)_valuep) = val; } | |
| 479 }; | |
| 480 | |
| 481 typedef PerfLongVariable PerfVariable; | |
| 482 | |
| 483 /* | |
| 484 * The PerfByteArray provides a PerfData subtype that allows the creation | |
| 485 * of a contiguous region of the PerfData memory region for storing a vector | |
| 486 * of bytes. This class is currently intended to be a base class for | |
| 487 * the PerfString class, and cannot be instantiated directly. | |
| 488 */ | |
| 489 class PerfByteArray : public PerfData { | |
| 490 | |
| 491 protected: | |
| 492 jint _length; | |
| 493 | |
| 494 PerfByteArray(CounterNS ns, const char* namep, Units u, Variability v, | |
| 495 jint length); | |
| 496 }; | |
| 497 | |
| 498 class PerfString : public PerfByteArray { | |
| 499 | |
| 500 protected: | |
| 501 | |
| 502 void set_string(const char* s2); | |
| 503 | |
| 504 PerfString(CounterNS ns, const char* namep, Variability v, jint length, | |
| 505 const char* initial_value) | |
| 506 : PerfByteArray(ns, namep, U_String, v, length) { | |
| 507 if (is_valid()) set_string(initial_value); | |
| 508 } | |
| 509 | |
| 510 public: | |
| 511 | |
| 512 int format(char* buffer, int length); | |
| 513 }; | |
| 514 | |
| 515 /* | |
| 516 * The PerfStringConstant class provides a PerfData sub class that | |
| 517 * allows a null terminated string of single byte characters to be | |
| 518 * stored in the PerfData memory region. | |
| 519 */ | |
| 520 class PerfStringConstant : public PerfString { | |
| 521 | |
| 522 friend class PerfDataManager; // for access to protected constructor | |
| 523 | |
| 524 private: | |
| 525 | |
| 526 // hide sample() - no need to sample constants | |
| 527 void sample() { } | |
| 528 | |
| 529 protected: | |
| 530 | |
| 531 // Restrict string constant lengths to be <= PerfMaxStringConstLength. | |
| 532 // This prevents long string constants, as can occur with very | |
| 533 // long classpaths or java command lines, from consuming too much | |
| 534 // PerfData memory. | |
| 535 PerfStringConstant(CounterNS ns, const char* namep, | |
| 536 const char* initial_value); | |
| 537 }; | |
| 538 | |
| 539 /* | |
| 540 * The PerfStringVariable class provides a PerfData sub class that | |
| 541 * allows a null terminated string of single byte character data | |
| 542 * to be stored in PerfData memory region. The string value can be reset | |
| 543 * after initialization. If the string value is >= max_length, then | |
| 544 * it will be truncated to max_length characters. The copied string | |
| 545 * is always null terminated. | |
| 546 */ | |
| 547 class PerfStringVariable : public PerfString { | |
| 548 | |
| 549 friend class PerfDataManager; // for access to protected constructor | |
| 550 | |
| 551 protected: | |
| 552 | |
| 553 // sampling of string variables are not yet supported | |
| 554 void sample() { } | |
| 555 | |
| 556 PerfStringVariable(CounterNS ns, const char* namep, jint max_length, | |
| 557 const char* initial_value) | |
| 558 : PerfString(ns, namep, V_Variable, max_length+1, | |
| 559 initial_value) { } | |
| 560 | |
| 561 public: | |
| 562 inline void set_value(const char* val) { set_string(val); } | |
| 563 }; | |
| 564 | |
| 565 | |
| 566 /* | |
| 567 * The PerfDataList class is a container class for managing lists | |
| 568 * of PerfData items. The intention of this class is to allow for | |
| 569 * alternative implementations for management of list of PerfData | |
| 570 * items without impacting the code that uses the lists. | |
| 571 * | |
| 572 * The initial implementation is based upon GrowableArray. Searches | |
| 573 * on GrowableArray types is linear in nature and this may become | |
| 574 * a performance issue for creation of PerfData items, particularly | |
| 575 * from Java code where a test for existence is implemented as a | |
| 576 * search over all existing PerfData items. | |
| 577 * | |
| 578 * The abstraction is not complete. A more general container class | |
| 579 * would provide an Iterator abstraction that could be used to | |
| 580 * traverse the lists. This implementation still relys upon integer | |
| 581 * iterators and the at(int index) method. However, the GrowableArray | |
| 582 * is not directly visible outside this class and can be replaced by | |
| 583 * some other implementation, as long as that implementation provides | |
| 584 * a mechanism to iterate over the container by index. | |
| 585 */ | |
| 586 class PerfDataList : public CHeapObj { | |
| 587 | |
| 588 private: | |
| 589 | |
| 590 // GrowableArray implementation | |
| 591 typedef GrowableArray<PerfData*> PerfDataArray; | |
| 592 | |
| 593 PerfDataArray* _set; | |
| 594 | |
| 595 // method to search for a instrumentation object by name | |
| 596 static bool by_name(void* name, PerfData* pd); | |
| 597 | |
| 598 protected: | |
| 599 // we expose the implementation here to facilitate the clone | |
| 600 // method. | |
| 601 PerfDataArray* get_impl() { return _set; } | |
| 602 | |
| 603 public: | |
| 604 | |
| 605 // create a PerfDataList with the given initial length | |
| 606 PerfDataList(int length); | |
| 607 | |
| 608 // create a PerfDataList as a shallow copy of the given PerfDataList | |
| 609 PerfDataList(PerfDataList* p); | |
| 610 | |
| 611 ~PerfDataList(); | |
| 612 | |
| 613 // return the PerfData item indicated by name, | |
| 614 // or NULL if it doesn't exist. | |
| 615 PerfData* find_by_name(const char* name); | |
| 616 | |
| 617 // return true if a PerfData item with the name specified in the | |
| 618 // argument exists, otherwise return false. | |
| 619 bool contains(const char* name) { return find_by_name(name) != NULL; } | |
| 620 | |
| 621 // return the number of PerfData items in this list | |
| 622 int length() { return _set->length(); } | |
| 623 | |
| 624 // add a PerfData item to this list | |
| 625 void append(PerfData *p) { _set->append(p); } | |
| 626 | |
| 627 // remove the given PerfData item from this list. When called | |
| 628 // while iterating over the list, this method will result in a | |
| 629 // change in the length of the container. The at(int index) | |
| 630 // method is also impacted by this method as elements with an | |
| 631 // index greater than the index of the element removed by this | |
| 632 // method will be shifted down by one. | |
| 633 void remove(PerfData *p) { _set->remove(p); } | |
| 634 | |
| 635 // create a new PerfDataList from this list. The new list is | |
| 636 // a shallow copy of the original list and care should be taken | |
| 637 // with respect to delete operations on the elements of the list | |
| 638 // as the are likely in use by another copy of the list. | |
| 639 PerfDataList* clone(); | |
| 640 | |
| 641 // for backward compatibility with GrowableArray - need to implement | |
| 642 // some form of iterator to provide a cleaner abstraction for | |
| 643 // iteration over the container. | |
| 644 PerfData* at(int index) { return _set->at(index); } | |
| 645 }; | |
| 646 | |
| 647 | |
| 648 /* | |
| 649 * The PerfDataManager class is responsible for creating PerfData | |
| 650 * subtypes via a set a factory methods and for managing lists | |
| 651 * of the various PerfData types. | |
| 652 */ | |
| 653 class PerfDataManager : AllStatic { | |
| 654 | |
| 655 friend class StatSampler; // for access to protected PerfDataList methods | |
| 656 | |
| 657 private: | |
| 658 static PerfDataList* _all; | |
| 659 static PerfDataList* _sampled; | |
| 660 static PerfDataList* _constants; | |
| 661 static const char* _name_spaces[]; | |
| 662 | |
| 663 // add a PerfData item to the list(s) of know PerfData objects | |
| 664 static void add_item(PerfData* p, bool sampled); | |
| 665 | |
| 666 protected: | |
| 667 // return the list of all known PerfData items | |
| 668 static PerfDataList* all(); | |
| 669 static int count() { return _all->length(); } | |
| 670 | |
| 671 // return the list of all known PerfData items that are to be | |
| 672 // sampled by the StatSampler. | |
| 673 static PerfDataList* sampled(); | |
| 674 static int sampled_count() { return _sampled->length(); } | |
| 675 | |
| 676 // return the list of all known PerfData items that have a | |
| 677 // variability classification of type Constant | |
| 678 static PerfDataList* constants(); | |
| 679 static int constants_count() { return _constants->length(); } | |
| 680 | |
| 681 public: | |
| 682 | |
| 683 // method to check for the existence of a PerfData item with | |
| 684 // the given name. | |
| 685 static bool exists(const char* name) { return _all->contains(name); } | |
| 686 | |
| 687 // method to map a CounterNS enumeration to a namespace string | |
| 688 static const char* ns_to_string(CounterNS ns) { | |
| 689 return _name_spaces[ns]; | |
| 690 } | |
| 691 | |
| 692 // methods to test the interface stability of a given counter namespace | |
| 693 // | |
| 694 static bool is_stable_supported(CounterNS ns) { | |
| 695 return (ns != NULL_NS) && ((ns % 3) == JAVA_NS); | |
| 696 } | |
| 697 static bool is_unstable_supported(CounterNS ns) { | |
| 698 return (ns != NULL_NS) && ((ns % 3) == COM_NS); | |
| 699 } | |
| 700 static bool is_unstable_unsupported(CounterNS ns) { | |
| 701 return (ns == NULL_NS) || ((ns % 3) == SUN_NS); | |
| 702 } | |
| 703 | |
| 704 // methods to test the interface stability of a given counter name | |
| 705 // | |
| 706 static bool is_stable_supported(const char* name) { | |
| 707 const char* javadot = "java."; | |
| 708 return strncmp(name, javadot, strlen(javadot)) == 0; | |
| 709 } | |
| 710 static bool is_unstable_supported(const char* name) { | |
| 711 const char* comdot = "com.sun."; | |
| 712 return strncmp(name, comdot, strlen(comdot)) == 0; | |
| 713 } | |
| 714 static bool is_unstable_unsupported(const char* name) { | |
| 715 return !(is_stable_supported(name) && is_unstable_supported(name)); | |
| 716 } | |
| 717 | |
| 718 // method to construct counter name strings in a given name space. | |
| 719 // The string object is allocated from the Resource Area and calls | |
| 720 // to this method must be made within a ResourceMark. | |
| 721 // | |
| 722 static char* counter_name(const char* name_space, const char* name); | |
| 723 | |
| 724 // method to construct name space strings in a given name space. | |
| 725 // The string object is allocated from the Resource Area and calls | |
| 726 // to this method must be made within a ResourceMark. | |
| 727 // | |
| 728 static char* name_space(const char* name_space, const char* sub_space) { | |
| 729 return counter_name(name_space, sub_space); | |
| 730 } | |
| 731 | |
| 732 // same as above, but appends the instance number to the name space | |
| 733 // | |
| 734 static char* name_space(const char* name_space, const char* sub_space, | |
| 735 int instance); | |
| 736 static char* name_space(const char* name_space, int instance); | |
| 737 | |
| 738 | |
| 739 // these methods provide the general interface for creating | |
| 740 // performance data resources. The types of performance data | |
| 741 // resources can be extended by adding additional create<type> | |
| 742 // methods. | |
| 743 | |
| 744 // Constant Types | |
| 745 static PerfStringConstant* create_string_constant(CounterNS ns, | |
| 746 const char* name, | |
| 747 const char *s, TRAPS); | |
| 748 | |
| 749 static PerfLongConstant* create_long_constant(CounterNS ns, | |
| 750 const char* name, | |
| 751 PerfData::Units u, | |
| 752 jlong val, TRAPS); | |
| 753 | |
| 754 | |
| 755 // Variable Types | |
| 756 static PerfStringVariable* create_string_variable(CounterNS ns, | |
| 757 const char* name, | |
| 758 int max_length, | |
| 759 const char *s, TRAPS); | |
| 760 | |
| 761 static PerfStringVariable* create_string_variable(CounterNS ns, | |
| 762 const char* name, | |
| 763 const char *s, TRAPS) { | |
| 764 return create_string_variable(ns, name, 0, s, CHECK_NULL); | |
| 765 }; | |
| 766 | |
| 767 static PerfLongVariable* create_long_variable(CounterNS ns, | |
| 768 const char* name, | |
| 769 PerfData::Units u, | |
| 770 jlong ival, TRAPS); | |
| 771 | |
| 772 static PerfLongVariable* create_long_variable(CounterNS ns, | |
| 773 const char* name, | |
| 774 PerfData::Units u, TRAPS) { | |
| 775 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
| 776 }; | |
| 777 | |
| 778 static PerfLongVariable* create_long_variable(CounterNS, const char* name, | |
| 779 PerfData::Units u, | |
| 780 jlong* sp, TRAPS); | |
| 781 | |
| 782 static PerfLongVariable* create_long_variable(CounterNS ns, | |
| 783 const char* name, | |
| 784 PerfData::Units u, | |
| 785 PerfLongSampleHelper* sh, | |
| 786 TRAPS); | |
| 787 | |
| 788 | |
| 789 // Counter Types | |
| 790 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
| 791 PerfData::Units u, | |
| 792 jlong ival, TRAPS); | |
| 793 | |
| 794 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
| 795 PerfData::Units u, TRAPS) { | |
| 796 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
| 797 }; | |
| 798 | |
| 799 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
| 800 PerfData::Units u, jlong* sp, | |
| 801 TRAPS); | |
| 802 | |
| 803 static PerfLongCounter* create_long_counter(CounterNS ns, const char* name, | |
| 804 PerfData::Units u, | |
| 805 PerfLongSampleHelper* sh, | |
| 806 TRAPS); | |
| 807 | |
| 808 | |
| 809 // these creation methods are provided for ease of use. These allow | |
| 810 // Long performance data types to be created with a shorthand syntax. | |
| 811 | |
| 812 static PerfConstant* create_constant(CounterNS ns, const char* name, | |
| 813 PerfData::Units u, jlong val, TRAPS) { | |
| 814 return create_long_constant(ns, name, u, val, CHECK_NULL); | |
| 815 } | |
| 816 | |
| 817 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
| 818 PerfData::Units u, jlong ival, TRAPS) { | |
| 819 return create_long_variable(ns, name, u, ival, CHECK_NULL); | |
| 820 } | |
| 821 | |
| 822 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
| 823 PerfData::Units u, TRAPS) { | |
| 824 return create_long_variable(ns, name, u, (jlong)0, CHECK_NULL); | |
| 825 } | |
| 826 | |
| 827 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
| 828 PerfData::Units u, jlong* sp, TRAPS) { | |
| 829 return create_long_variable(ns, name, u, sp, CHECK_NULL); | |
| 830 } | |
| 831 | |
| 832 static PerfVariable* create_variable(CounterNS ns, const char* name, | |
| 833 PerfData::Units u, | |
| 834 PerfSampleHelper* sh, TRAPS) { | |
| 835 return create_long_variable(ns, name, u, sh, CHECK_NULL); | |
| 836 } | |
| 837 | |
| 838 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
| 839 PerfData::Units u, jlong ival, TRAPS) { | |
| 840 return create_long_counter(ns, name, u, ival, CHECK_NULL); | |
| 841 } | |
| 842 | |
| 843 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
| 844 PerfData::Units u, TRAPS) { | |
| 845 return create_long_counter(ns, name, u, (jlong)0, CHECK_NULL); | |
| 846 } | |
| 847 | |
| 848 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
| 849 PerfData::Units u, jlong* sp, TRAPS) { | |
| 850 return create_long_counter(ns, name, u, sp, CHECK_NULL); | |
| 851 } | |
| 852 | |
| 853 static PerfCounter* create_counter(CounterNS ns, const char* name, | |
| 854 PerfData::Units u, | |
| 855 PerfSampleHelper* sh, TRAPS) { | |
| 856 return create_long_counter(ns, name, u, sh, CHECK_NULL); | |
| 857 } | |
| 858 | |
| 859 static void destroy(); | |
| 860 }; | |
| 861 | |
| 862 // Useful macros to create the performance counters | |
| 863 #define NEWPERFTICKCOUNTER(counter, counter_ns, counter_name) \ | |
| 864 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
| 865 PerfData::U_Ticks,CHECK);} | |
| 866 | |
| 867 #define NEWPERFEVENTCOUNTER(counter, counter_ns, counter_name) \ | |
| 868 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ | |
| 869 PerfData::U_Events,CHECK);} | |
| 870 | |
|
875
6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
mchung
parents:
0
diff
changeset
|
871 #define NEWPERFBYTECOUNTER(counter, counter_ns, counter_name) \ |
|
6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
mchung
parents:
0
diff
changeset
|
872 {counter = PerfDataManager::create_counter(counter_ns, counter_name, \ |
|
6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
mchung
parents:
0
diff
changeset
|
873 PerfData::U_Bytes,CHECK);} |
|
6a93908f268f
6857194: Add hotspot perf counters to aid class loading performance measurement
mchung
parents:
0
diff
changeset
|
874 |
| 0 | 875 // Utility Classes |
| 876 | |
| 877 /* | |
| 878 * this class will administer a PerfCounter used as a time accumulator | |
| 879 * for a basic block much like the TraceTime class. | |
| 880 * | |
| 881 * Example: | |
| 882 * | |
| 883 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, 0LL, CHECK); | |
| 884 * | |
| 885 * { | |
| 886 * PerfTraceTime ptt(my_time_counter); | |
| 887 * // perform the operation you want to measure | |
| 888 * } | |
| 889 * | |
| 890 * Note: use of this class does not need to occur within a guarded | |
| 891 * block. The UsePerfData guard is used with the implementation | |
| 892 * of this class. | |
| 893 */ | |
| 894 class PerfTraceTime : public StackObj { | |
| 895 | |
| 896 protected: | |
| 897 elapsedTimer _t; | |
| 898 PerfLongCounter* _timerp; | |
| 899 // pointer to thread-local or global recursion counter variable | |
| 900 int* _recursion_counter; | |
| 901 | |
| 902 public: | |
| 903 inline PerfTraceTime(PerfLongCounter* timerp) : _timerp(timerp), _recursion_counter(NULL) { | |
| 904 if (!UsePerfData) return; | |
| 905 _t.start(); | |
| 906 } | |
| 907 | |
| 908 inline PerfTraceTime(PerfLongCounter* timerp, int* recursion_counter) : _timerp(timerp), _recursion_counter(recursion_counter) { | |
| 909 if (!UsePerfData || (_recursion_counter != NULL && | |
| 910 (*_recursion_counter)++ > 0)) return; | |
| 911 _t.start(); | |
| 912 } | |
| 913 | |
| 914 inline void suspend() { if (!UsePerfData) return; _t.stop(); } | |
| 915 inline void resume() { if (!UsePerfData) return; _t.start(); } | |
| 916 | |
| 917 inline ~PerfTraceTime() { | |
| 918 if (!UsePerfData || (_recursion_counter != NULL && | |
| 919 --(*_recursion_counter) > 0)) return; | |
| 920 _t.stop(); | |
| 921 _timerp->inc(_t.ticks()); | |
| 922 } | |
| 923 }; | |
| 924 | |
| 925 /* The PerfTraceTimedEvent class is responsible for counting the | |
| 926 * occurrence of some event and measuring the the elapsed time of | |
| 927 * the event in two separate PerfCounter instances. | |
| 928 * | |
| 929 * Example: | |
| 930 * | |
| 931 * static PerfCounter* my_time_counter = PerfDataManager::create_counter("my.time.counter", PerfData::U_Ticks, CHECK); | |
| 932 * static PerfCounter* my_event_counter = PerfDataManager::create_counter("my.event.counter", PerfData::U_Events, CHECK); | |
| 933 * | |
| 934 * { | |
| 935 * PerfTraceTimedEvent ptte(my_time_counter, my_event_counter); | |
| 936 * // perform the operation you want to count and measure | |
| 937 * } | |
| 938 * | |
| 939 * Note: use of this class does not need to occur within a guarded | |
| 940 * block. The UsePerfData guard is used with the implementation | |
| 941 * of this class. | |
| 942 * | |
| 943 */ | |
| 944 class PerfTraceTimedEvent : public PerfTraceTime { | |
| 945 | |
| 946 protected: | |
| 947 PerfLongCounter* _eventp; | |
| 948 | |
| 949 public: | |
| 950 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp): PerfTraceTime(timerp), _eventp(eventp) { | |
| 951 if (!UsePerfData) return; | |
| 952 _eventp->inc(); | |
| 953 } | |
| 954 | |
| 955 inline PerfTraceTimedEvent(PerfLongCounter* timerp, PerfLongCounter* eventp, int* recursion_counter): PerfTraceTime(timerp, recursion_counter), _eventp(eventp) { | |
| 956 if (!UsePerfData) return; | |
| 957 _eventp->inc(); | |
| 958 } | |
| 959 }; |