perf.cpp revision 5776:de6a9e811145
1/* 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/vmSymbols.hpp" 27#include "memory/allocation.inline.hpp" 28#include "memory/resourceArea.hpp" 29#include "oops/oop.inline.hpp" 30#include "prims/jni.h" 31#include "prims/jvm.h" 32#include "runtime/interfaceSupport.hpp" 33#include "runtime/perfData.hpp" 34#include "runtime/perfMemory.hpp" 35 36/* 37 * Implementation of class sun.misc.Perf 38 */ 39 40 41#define PERF_ENTRY(result_type, header) \ 42 JVM_ENTRY(result_type, header) 43 44#define PERF_END JVM_END 45 46#define PerfWrapper(arg) /* Unimplemented at this time */ 47 48static char* jstr_to_utf(JNIEnv *env, jstring str, TRAPS) { 49 50 char* utfstr = NULL; 51 52 if (str == NULL) { 53 THROW_0(vmSymbols::java_lang_NullPointerException()); 54 //throw_new(env,"NullPointerException"); 55 } 56 57 int len = env->GetStringUTFLength(str); 58 int unicode_len = env->GetStringLength(str); 59 60 utfstr = NEW_RESOURCE_ARRAY(char, len + 1); 61 62 env->GetStringUTFRegion(str, 0, unicode_len, utfstr); 63 64 return utfstr; 65} 66 67PERF_ENTRY(jobject, Perf_Attach(JNIEnv *env, jobject unused, jstring user, int vmid, int mode)) 68 69 PerfWrapper("Perf_Attach"); 70 71 char* address = 0; 72 size_t capacity = 0; 73 const char* user_utf = NULL; 74 75 ResourceMark rm; 76 77 { 78 ThreadToNativeFromVM ttnfv(thread); 79 80 user_utf = user == NULL ? NULL : jstr_to_utf(env, user, CHECK_NULL); 81 } 82 83 if (mode != PerfMemory::PERF_MODE_RO && 84 mode != PerfMemory::PERF_MODE_RW) { 85 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 86 } 87 88 // attach to the PerfData memory region for the specified VM 89 PerfMemory::attach(user_utf, vmid, (PerfMemory::PerfMemoryMode) mode, 90 &address, &capacity, CHECK_NULL); 91 92 { 93 ThreadToNativeFromVM ttnfv(thread); 94 return env->NewDirectByteBuffer(address, (jlong)capacity); 95 } 96 97PERF_END 98 99PERF_ENTRY(void, Perf_Detach(JNIEnv *env, jobject unused, jobject buffer)) 100 101 PerfWrapper("Perf_Detach"); 102 103 void* address = 0; 104 jlong capacity = 0; 105 106 // get buffer address and capacity 107 { 108 ThreadToNativeFromVM ttnfv(thread); 109 address = env->GetDirectBufferAddress(buffer); 110 capacity = env->GetDirectBufferCapacity(buffer); 111 } 112 113 PerfMemory::detach((char*)address, capacity, CHECK); 114 115PERF_END 116 117PERF_ENTRY(jobject, Perf_CreateLong(JNIEnv *env, jobject perf, jstring name, 118 int variability, int units, jlong value)) 119 120 PerfWrapper("Perf_CreateLong"); 121 122 char* name_utf = NULL; 123 124 if (units <= 0 || units > PerfData::U_Last) { 125 debug_only(warning("unexpected units argument, units = %d", units)); 126 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 127 } 128 129 ResourceMark rm; 130 131 { 132 ThreadToNativeFromVM ttnfv(thread); 133 134 name_utf = jstr_to_utf(env, name, CHECK_NULL); 135 } 136 137 PerfLong* pl = NULL; 138 139 // check that the PerfData name doesn't already exist 140 if (PerfDataManager::exists(name_utf)) { 141 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "PerfLong name already exists"); 142 } 143 144 switch(variability) { 145 case PerfData::V_Constant: 146 pl = PerfDataManager::create_long_constant(NULL_NS, (char *)name_utf, 147 (PerfData::Units)units, value, 148 CHECK_NULL); 149 break; 150 151 case PerfData::V_Monotonic: 152 pl = PerfDataManager::create_long_counter(NULL_NS, (char *)name_utf, 153 (PerfData::Units)units, value, 154 CHECK_NULL); 155 break; 156 157 case PerfData::V_Variable: 158 pl = PerfDataManager::create_long_variable(NULL_NS, (char *)name_utf, 159 (PerfData::Units)units, value, 160 CHECK_NULL); 161 break; 162 163 default: /* Illegal Argument */ 164 debug_only(warning("unexpected variability value: %d", variability)); 165 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 166 break; 167 } 168 169 long* lp = (long*)pl->get_address(); 170 171 { 172 ThreadToNativeFromVM ttnfv(thread); 173 return env->NewDirectByteBuffer(lp, sizeof(jlong)); 174 } 175 176PERF_END 177 178PERF_ENTRY(jobject, Perf_CreateByteArray(JNIEnv *env, jobject perf, 179 jstring name, jint variability, 180 jint units, jbyteArray value, 181 jint maxlength)) 182 183 PerfWrapper("Perf_CreateByteArray"); 184 185 // check for valid byte array objects 186 if (name == NULL || value == NULL) { 187 THROW_0(vmSymbols::java_lang_NullPointerException()); 188 } 189 190 // check for valid variability classification 191 if (variability != PerfData::V_Constant && 192 variability != PerfData::V_Variable) { 193 debug_only(warning("unexpected variability value: %d", variability)); 194 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 195 } 196 197 // check for valid units 198 if (units != PerfData::U_String) { 199 // only String based ByteArray objects are currently supported 200 debug_only(warning("unexpected units value: %d", variability)); 201 THROW_0(vmSymbols::java_lang_IllegalArgumentException()); 202 } 203 204 int value_length; 205 char* name_utf = NULL; 206 jbyte* value_local = NULL; 207 208 ResourceMark rm; 209 210 { 211 ThreadToNativeFromVM ttnfv(thread); 212 213 name_utf = jstr_to_utf(env, name, CHECK_NULL); 214 215 value_length = env->GetArrayLength(value); 216 217 value_local = NEW_RESOURCE_ARRAY(jbyte, value_length + 1); 218 219 env->GetByteArrayRegion(value, 0, value_length, value_local); 220 } 221 222 // check that the counter name doesn't already exist 223 if (PerfDataManager::exists((char*)name_utf)) { 224 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "PerfByteArray name already exists"); 225 } 226 227 PerfByteArray* pbv = NULL; 228 229 if (units == PerfData::U_String) { 230 231 if (variability == PerfData::V_Constant) { 232 // create the string constant 233 pbv = PerfDataManager::create_string_constant(NULL_NS, (char*)name_utf, 234 (char*)value_local, 235 CHECK_NULL); 236 237 assert(maxlength == value_length, "string constant length should be == maxlength"); 238 maxlength = value_length; 239 } 240 else { 241 242 // create the string variable 243 pbv = PerfDataManager::create_string_variable(NULL_NS, (char*)name_utf, 244 maxlength, 245 (char*)value_local, 246 CHECK_NULL); 247 248 assert(maxlength >= value_length,"string variable length should be <= maxlength"); 249 } 250 } 251 252 char* cp = (char*)pbv->get_address(); 253 254 { 255 ThreadToNativeFromVM ttnfv(thread); 256 return env->NewDirectByteBuffer(cp, maxlength+1); 257 } 258 259PERF_END 260 261PERF_ENTRY(jlong, Perf_HighResCounter(JNIEnv *env, jobject perf)) 262 263 PerfWrapper("Perf_HighResCounter"); 264 265 // this should be a method in java.lang.System. This value could 266 // be acquired through access to a PerfData performance counter, but 267 // doing so would require that the PerfData monitoring overhead be 268 // incurred by all Java applications, which is unacceptable. 269 270 return os::elapsed_counter(); 271 272PERF_END 273 274PERF_ENTRY(jlong, Perf_HighResFrequency(JNIEnv *env, jobject perf)) 275 276 PerfWrapper("Perf_HighResFrequency"); 277 278 // this should be a method in java.lang.System. This value could 279 // be acquired through access to a PerfData performance counter, but 280 // doing so would require that the PerfData monitoring overhead be 281 // incurred by all Java applications, which is unacceptable. 282 283 return os::elapsed_frequency(); 284 285PERF_END 286 287/// JVM_RegisterPerfMethods 288 289#define CC (char*) /*cast a literal from (const char*)*/ 290#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 291#define BB "Ljava/nio/ByteBuffer;" 292#define JLS "Ljava/lang/String;" 293#define CL_ARGS CC"("JLS"IIJ)"BB 294#define CBA_ARGS CC"("JLS"II[BI)"BB 295 296static JNINativeMethod perfmethods[] = { 297 298 {CC"attach", CC"("JLS"II)"BB, FN_PTR(Perf_Attach)}, 299 {CC"detach", CC"("BB")V", FN_PTR(Perf_Detach)}, 300 {CC"createLong", CL_ARGS, FN_PTR(Perf_CreateLong)}, 301 {CC"createByteArray", CBA_ARGS, FN_PTR(Perf_CreateByteArray)}, 302 {CC"highResCounter", CC"()J", FN_PTR(Perf_HighResCounter)}, 303 {CC"highResFrequency", CC"()J", FN_PTR(Perf_HighResFrequency)} 304}; 305 306#undef CBA_ARGS 307#undef CL_ARGS 308#undef JLS 309#undef BB 310#undef FN_PTR 311#undef CC 312 313// This one function is exported, used by NativeLookup. 314JVM_ENTRY(void, JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass)) 315 PerfWrapper("JVM_RegisterPerfMethods"); 316 { 317 ThreadToNativeFromVM ttnfv(thread); 318 int ok = env->RegisterNatives(perfclass, perfmethods, sizeof(perfmethods)/sizeof(JNINativeMethod)); 319 guarantee(ok == 0, "register perf natives"); 320 } 321JVM_END 322