1 /* 2 * Copyright (c) 2010, 2015, 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 "compiler/compileBroker.hpp" 27 #include "memory/resourceArea.hpp" 28 #include "runtime/arguments.hpp" 29 #include "runtime/simpleThresholdPolicy.hpp" 30 #include "runtime/simpleThresholdPolicy.inline.hpp" 31 #include "code/scopeDesc.hpp" 32 33 34 void SimpleThresholdPolicy::print_counters(const char* prefix, methodHandle mh) { 35 int invocation_count = mh->invocation_count(); 36 int backedge_count = mh->backedge_count(); 37 MethodData* mdh = mh->method_data(); 38 int mdo_invocations = 0, mdo_backedges = 0; 39 int mdo_invocations_start = 0, mdo_backedges_start = 0; 40 if (mdh != NULL) { 41 mdo_invocations = mdh->invocation_count(); 42 mdo_backedges = mdh->backedge_count(); 43 mdo_invocations_start = mdh->invocation_count_start(); 44 mdo_backedges_start = mdh->backedge_count_start(); 45 } 46 tty->print(" %stotal=%d,%d %smdo=%d(%d),%d(%d)", prefix, 47 invocation_count, backedge_count, prefix, 48 mdo_invocations, mdo_invocations_start, 49 mdo_backedges, mdo_backedges_start); 50 tty->print(" %smax levels=%d,%d", prefix, 51 mh->highest_comp_level(), mh->highest_osr_comp_level()); 52 } 53 54 // Print an event. 55 void SimpleThresholdPolicy::print_event(EventType type, methodHandle mh, methodHandle imh, 56 int bci, CompLevel level) { 57 bool inlinee_event = mh() != imh(); 58 59 ttyLocker tty_lock; 60 tty->print("%lf: [", os::elapsedTime()); 61 62 switch(type) { 63 case CALL: 64 tty->print("call"); 65 break; 66 case LOOP: 67 tty->print("loop"); 68 break; 69 case COMPILE: 70 tty->print("compile"); 71 break; 72 case REMOVE_FROM_QUEUE: 73 tty->print("remove-from-queue"); 74 break; 75 case UPDATE_IN_QUEUE: 76 tty->print("update-in-queue"); 77 break; 78 case REPROFILE: 79 tty->print("reprofile"); 80 break; 81 case MAKE_NOT_ENTRANT: 82 tty->print("make-not-entrant"); 83 break; 84 default: 85 tty->print("unknown"); 86 } 87 88 tty->print(" level=%d ", level); 89 90 ResourceMark rm; 91 char *method_name = mh->name_and_sig_as_C_string(); 92 tty->print("[%s", method_name); 93 if (inlinee_event) { 94 char *inlinee_name = imh->name_and_sig_as_C_string(); 95 tty->print(" [%s]] ", inlinee_name); 96 } 97 else tty->print("] "); 98 tty->print("@%d queues=%d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile), 99 CompileBroker::queue_size(CompLevel_full_optimization)); 100 101 print_specific(type, mh, imh, bci, level); 102 103 if (type != COMPILE) { 104 print_counters("", mh); 105 if (inlinee_event) { 106 print_counters("inlinee ", imh); 107 } 108 tty->print(" compilable="); 109 bool need_comma = false; 110 if (!mh->is_not_compilable(CompLevel_full_profile)) { 111 tty->print("c1"); 112 need_comma = true; 113 } 114 if (!mh->is_not_osr_compilable(CompLevel_full_profile)) { 115 if (need_comma) tty->print(","); 116 tty->print("c1-osr"); 117 need_comma = true; 118 } 119 if (!mh->is_not_compilable(CompLevel_full_optimization)) { 120 if (need_comma) tty->print(","); 121 tty->print("c2"); 122 need_comma = true; 123 } 124 if (!mh->is_not_osr_compilable(CompLevel_full_optimization)) { 125 if (need_comma) tty->print(","); 126 tty->print("c2-osr"); 127 } 128 tty->print(" status="); 129 if (mh->queued_for_compilation()) { 130 tty->print("in-queue"); 131 } else tty->print("idle"); 132 } 133 tty->print_cr("]"); 134 } 135 136 void SimpleThresholdPolicy::initialize() { 137 if (FLAG_IS_DEFAULT(CICompilerCount)) { 138 FLAG_SET_DEFAULT(CICompilerCount, 3); 139 } 140 int count = CICompilerCount; 141 #ifdef _LP64 142 // On 64-bit systems, scale the number of compiler threads with 143 // the number of cores available on the system. Scaling is not 144 // performed on 32-bit systems because it can lead to exhaustion 145 // of the virtual memory address space available to the JVM. 146 if (CICompilerCountPerCPU) { 147 count = MAX2(log2_intptr(os::active_processor_count()), 1) * 3 / 2; 148 } 149 #endif 150 set_c1_count(MAX2(count / 3, 1)); 151 set_c2_count(MAX2(count - c1_count(), 1)); 152 FLAG_SET_ERGO(intx, CICompilerCount, c1_count() + c2_count()); 153 } 154 155 void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) { 156 if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) { 157 counter->set_carry_flag(); 158 } 159 } 160 161 // Set carry flags on the counters if necessary 162 void SimpleThresholdPolicy::handle_counter_overflow(Method* method) { 163 MethodCounters *mcs = method->method_counters(); 164 if (mcs != NULL) { 165 set_carry_if_necessary(mcs->invocation_counter()); 166 set_carry_if_necessary(mcs->backedge_counter()); 167 } 168 MethodData* mdo = method->method_data(); 169 if (mdo != NULL) { 170 set_carry_if_necessary(mdo->invocation_counter()); 171 set_carry_if_necessary(mdo->backedge_counter()); 172 } 173 } 174 175 // Called with the queue locked and with at least one element 176 CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) { 177 return select_task_helper(compile_queue); 178 } 179 180 void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { 181 for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) { 182 if (PrintTieredEvents) { 183 methodHandle mh(sd->method()); 184 print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none); 185 } 186 MethodData* mdo = sd->method()->method_data(); 187 if (mdo != NULL) { 188 mdo->reset_start_counters(); 189 } 190 if (sd->is_top()) break; 191 } 192 } 193 194 nmethod* SimpleThresholdPolicy::event(const methodHandle& method, const methodHandle& inlinee, 195 int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) { 196 if (comp_level == CompLevel_none && 197 JvmtiExport::can_post_interpreter_events() && 198 thread->is_interp_only_mode()) { 199 return NULL; 200 } 201 if (CompileTheWorld || ReplayCompiles) { 202 // Don't trigger other compiles in testing mode 203 return NULL; 204 } 205 206 handle_counter_overflow(method()); 207 if (method() != inlinee()) { 208 handle_counter_overflow(inlinee()); 209 } 210 211 if (PrintTieredEvents) { 212 print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level); 213 } 214 215 if (bci == InvocationEntryBci) { 216 method_invocation_event(method, inlinee, comp_level, nm, thread); 217 } else { 218 // method == inlinee if the event originated in the main method 219 method_back_branch_event(method, inlinee, bci, comp_level, nm, thread); 220 // Check if event led to a higher level OSR compilation 221 nmethod* osr_nm = inlinee->lookup_osr_nmethod_for(bci, comp_level, false); 222 if (osr_nm != NULL && osr_nm->comp_level() > comp_level) { 223 // Perform OSR with new nmethod 224 return osr_nm; 225 } 226 } 227 return NULL; 228 } 229 230 // Check if the method can be compiled, change level if necessary 231 void SimpleThresholdPolicy::compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread) { 232 assert(level <= TieredStopAtLevel, "Invalid compilation level"); 233 if (level == CompLevel_none) { 234 return; 235 } 236 237 #if INCLUDE_JVMCI 238 // We can't compile with a JVMCI compiler until the module system is initialized. 239 if (level == CompLevel_full_optimization && UseJVMCICompiler && !Universe::is_module_initialized()) { 240 return; 241 } 242 #endif 243 244 // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling 245 // in the interpreter and then compile with C2 (the transition function will request that, 246 // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with 247 // pure C1. 248 if (!can_be_compiled(mh, level)) { 249 if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) { 250 compile(mh, bci, CompLevel_simple, thread); 251 } 252 return; 253 } 254 if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) { 255 return; 256 } 257 if (!CompileBroker::compilation_is_in_queue(mh)) { 258 if (PrintTieredEvents) { 259 print_event(COMPILE, mh, mh, bci, level); 260 } 261 submit_compile(mh, bci, level, thread); 262 } 263 } 264 265 // Tell the broker to compile the method 266 void SimpleThresholdPolicy::submit_compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread) { 267 int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count(); 268 CompileBroker::compile_method(mh, bci, level, mh, hot_count, "tiered", thread); 269 } 270 271 // Call and loop predicates determine whether a transition to a higher 272 // compilation level should be performed (pointers to predicate functions 273 // are passed to common() transition function). 274 bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level, Method* method) { 275 switch(cur_level) { 276 case CompLevel_none: 277 case CompLevel_limited_profile: { 278 return loop_predicate_helper<CompLevel_none>(i, b, 1.0, method); 279 } 280 case CompLevel_full_profile: { 281 return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0, method); 282 } 283 default: 284 return true; 285 } 286 } 287 288 bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level, Method* method) { 289 switch(cur_level) { 290 case CompLevel_none: 291 case CompLevel_limited_profile: { 292 return call_predicate_helper<CompLevel_none>(i, b, 1.0, method); 293 } 294 case CompLevel_full_profile: { 295 return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0, method); 296 } 297 default: 298 return true; 299 } 300 } 301 302 // Determine is a method is mature. 303 bool SimpleThresholdPolicy::is_mature(Method* method) { 304 if (is_trivial(method)) return true; 305 MethodData* mdo = method->method_data(); 306 if (mdo != NULL) { 307 int i = mdo->invocation_count(); 308 int b = mdo->backedge_count(); 309 double k = ProfileMaturityPercentage / 100.0; 310 return call_predicate_helper<CompLevel_full_profile>(i, b, k, method) || 311 loop_predicate_helper<CompLevel_full_profile>(i, b, k, method); 312 } 313 return false; 314 } 315 316 // Common transition function. Given a predicate determines if a method should transition to another level. 317 CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) { 318 CompLevel next_level = cur_level; 319 int i = method->invocation_count(); 320 int b = method->backedge_count(); 321 322 if (is_trivial(method)) { 323 next_level = CompLevel_simple; 324 } else { 325 switch(cur_level) { 326 case CompLevel_none: 327 // If we were at full profile level, would we switch to full opt? 328 if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) { 329 next_level = CompLevel_full_optimization; 330 } else if ((this->*p)(i, b, cur_level, method)) { 331 next_level = CompLevel_full_profile; 332 } 333 break; 334 case CompLevel_limited_profile: 335 case CompLevel_full_profile: 336 { 337 MethodData* mdo = method->method_data(); 338 if (mdo != NULL) { 339 if (mdo->would_profile()) { 340 int mdo_i = mdo->invocation_count_delta(); 341 int mdo_b = mdo->backedge_count_delta(); 342 if ((this->*p)(mdo_i, mdo_b, cur_level, method)) { 343 next_level = CompLevel_full_optimization; 344 } 345 } else { 346 next_level = CompLevel_full_optimization; 347 } 348 } 349 } 350 break; 351 } 352 } 353 return MIN2(next_level, (CompLevel)TieredStopAtLevel); 354 } 355 356 // Determine if a method should be compiled with a normal entry point at a different level. 357 CompLevel SimpleThresholdPolicy::call_event(Method* method, CompLevel cur_level) { 358 CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(), 359 common(&SimpleThresholdPolicy::loop_predicate, method, cur_level)); 360 CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level); 361 362 // If OSR method level is greater than the regular method level, the levels should be 363 // equalized by raising the regular method level in order to avoid OSRs during each 364 // invocation of the method. 365 if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) { 366 MethodData* mdo = method->method_data(); 367 guarantee(mdo != NULL, "MDO should not be NULL"); 368 if (mdo->invocation_count() >= 1) { 369 next_level = CompLevel_full_optimization; 370 } 371 } else { 372 next_level = MAX2(osr_level, next_level); 373 } 374 375 return next_level; 376 } 377 378 // Determine if we should do an OSR compilation of a given method. 379 CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level) { 380 CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level); 381 if (cur_level == CompLevel_none) { 382 // If there is a live OSR method that means that we deopted to the interpreter 383 // for the transition. 384 CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level); 385 if (osr_level > CompLevel_none) { 386 return osr_level; 387 } 388 } 389 return next_level; 390 } 391 392 393 // Handle the invocation event. 394 void SimpleThresholdPolicy::method_invocation_event(const methodHandle& mh, const methodHandle& imh, 395 CompLevel level, nmethod* nm, JavaThread* thread) { 396 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) { 397 CompLevel next_level = call_event(mh(), level); 398 if (next_level != level) { 399 compile(mh, InvocationEntryBci, next_level, thread); 400 } 401 } 402 } 403 404 // Handle the back branch event. Notice that we can compile the method 405 // with a regular entry from here. 406 void SimpleThresholdPolicy::method_back_branch_event(const methodHandle& mh, const methodHandle& imh, 407 int bci, CompLevel level, nmethod* nm, JavaThread* thread) { 408 // If the method is already compiling, quickly bail out. 409 if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) { 410 // Use loop event as an opportunity to also check there's been 411 // enough calls. 412 CompLevel cur_level = comp_level(mh()); 413 CompLevel next_level = call_event(mh(), cur_level); 414 CompLevel next_osr_level = loop_event(mh(), level); 415 416 next_level = MAX2(next_level, 417 next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level); 418 bool is_compiling = false; 419 if (next_level != cur_level) { 420 compile(mh, InvocationEntryBci, next_level, thread); 421 is_compiling = true; 422 } 423 424 // Do the OSR version 425 if (!is_compiling && next_osr_level != level) { 426 compile(mh, bci, next_osr_level, thread); 427 } 428 } 429 }