| /* |
| * Copyright (c) 2010, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/simpleThresholdPolicy.hpp" |
| #include "runtime/simpleThresholdPolicy.inline.hpp" |
| #include "code/scopeDesc.hpp" |
| #if INCLUDE_JVMCI |
| #include "jvmci/jvmciRuntime.hpp" |
| #endif |
| |
| #ifdef TIERED |
| |
| void SimpleThresholdPolicy::print_counters(const char* prefix, const methodHandle& mh) { |
| int invocation_count = mh->invocation_count(); |
| int backedge_count = mh->backedge_count(); |
| MethodData* mdh = mh->method_data(); |
| int mdo_invocations = 0, mdo_backedges = 0; |
| int mdo_invocations_start = 0, mdo_backedges_start = 0; |
| if (mdh != NULL) { |
| mdo_invocations = mdh->invocation_count(); |
| mdo_backedges = mdh->backedge_count(); |
| mdo_invocations_start = mdh->invocation_count_start(); |
| mdo_backedges_start = mdh->backedge_count_start(); |
| } |
| tty->print(" %stotal=%d,%d %smdo=%d(%d),%d(%d)", prefix, |
| invocation_count, backedge_count, prefix, |
| mdo_invocations, mdo_invocations_start, |
| mdo_backedges, mdo_backedges_start); |
| tty->print(" %smax levels=%d,%d", prefix, |
| mh->highest_comp_level(), mh->highest_osr_comp_level()); |
| } |
| |
| // Print an event. |
| void SimpleThresholdPolicy::print_event(EventType type, const methodHandle& mh, const methodHandle& imh, |
| int bci, CompLevel level) { |
| bool inlinee_event = mh() != imh(); |
| |
| ttyLocker tty_lock; |
| tty->print("%lf: [", os::elapsedTime()); |
| |
| switch(type) { |
| case CALL: |
| tty->print("call"); |
| break; |
| case LOOP: |
| tty->print("loop"); |
| break; |
| case COMPILE: |
| tty->print("compile"); |
| break; |
| case REMOVE_FROM_QUEUE: |
| tty->print("remove-from-queue"); |
| break; |
| case UPDATE_IN_QUEUE: |
| tty->print("update-in-queue"); |
| break; |
| case REPROFILE: |
| tty->print("reprofile"); |
| break; |
| case MAKE_NOT_ENTRANT: |
| tty->print("make-not-entrant"); |
| break; |
| default: |
| tty->print("unknown"); |
| } |
| |
| tty->print(" level=%d ", level); |
| |
| ResourceMark rm; |
| char *method_name = mh->name_and_sig_as_C_string(); |
| tty->print("[%s", method_name); |
| if (inlinee_event) { |
| char *inlinee_name = imh->name_and_sig_as_C_string(); |
| tty->print(" [%s]] ", inlinee_name); |
| } |
| else tty->print("] "); |
| tty->print("@%d queues=%d,%d", bci, CompileBroker::queue_size(CompLevel_full_profile), |
| CompileBroker::queue_size(CompLevel_full_optimization)); |
| |
| print_specific(type, mh, imh, bci, level); |
| |
| if (type != COMPILE) { |
| print_counters("", mh); |
| if (inlinee_event) { |
| print_counters("inlinee ", imh); |
| } |
| tty->print(" compilable="); |
| bool need_comma = false; |
| if (!mh->is_not_compilable(CompLevel_full_profile)) { |
| tty->print("c1"); |
| need_comma = true; |
| } |
| if (!mh->is_not_osr_compilable(CompLevel_full_profile)) { |
| if (need_comma) tty->print(","); |
| tty->print("c1-osr"); |
| need_comma = true; |
| } |
| if (!mh->is_not_compilable(CompLevel_full_optimization)) { |
| if (need_comma) tty->print(","); |
| tty->print("c2"); |
| need_comma = true; |
| } |
| if (!mh->is_not_osr_compilable(CompLevel_full_optimization)) { |
| if (need_comma) tty->print(","); |
| tty->print("c2-osr"); |
| } |
| tty->print(" status="); |
| if (mh->queued_for_compilation()) { |
| tty->print("in-queue"); |
| } else tty->print("idle"); |
| } |
| tty->print_cr("]"); |
| } |
| |
| void SimpleThresholdPolicy::initialize() { |
| if (FLAG_IS_DEFAULT(CICompilerCount)) { |
| FLAG_SET_DEFAULT(CICompilerCount, 3); |
| } |
| int count = CICompilerCount; |
| #ifdef _LP64 |
| // On 64-bit systems, scale the number of compiler threads with |
| // the number of cores available on the system. Scaling is not |
| // performed on 32-bit systems because it can lead to exhaustion |
| // of the virtual memory address space available to the JVM. |
| if (CICompilerCountPerCPU) { |
| count = MAX2(log2_intptr(os::active_processor_count()) * 3 / 2, 2); |
| FLAG_SET_ERGO(intx, CICompilerCount, count); |
| } |
| #endif |
| if (TieredStopAtLevel < CompLevel_full_optimization) { |
| // No C2 compiler thread required |
| set_c1_count(count); |
| } else { |
| set_c1_count(MAX2(count / 3, 1)); |
| set_c2_count(MAX2(count - c1_count(), 1)); |
| } |
| assert(count == c1_count() + c2_count(), "inconsistent compiler thread count"); |
| } |
| |
| void SimpleThresholdPolicy::set_carry_if_necessary(InvocationCounter *counter) { |
| if (!counter->carry() && counter->count() > InvocationCounter::count_limit / 2) { |
| counter->set_carry_flag(); |
| } |
| } |
| |
| // Set carry flags on the counters if necessary |
| void SimpleThresholdPolicy::handle_counter_overflow(Method* method) { |
| MethodCounters *mcs = method->method_counters(); |
| if (mcs != NULL) { |
| set_carry_if_necessary(mcs->invocation_counter()); |
| set_carry_if_necessary(mcs->backedge_counter()); |
| } |
| MethodData* mdo = method->method_data(); |
| if (mdo != NULL) { |
| set_carry_if_necessary(mdo->invocation_counter()); |
| set_carry_if_necessary(mdo->backedge_counter()); |
| } |
| } |
| |
| // Called with the queue locked and with at least one element |
| CompileTask* SimpleThresholdPolicy::select_task(CompileQueue* compile_queue) { |
| return select_task_helper(compile_queue); |
| } |
| |
| void SimpleThresholdPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) { |
| for (ScopeDesc* sd = trap_scope;; sd = sd->sender()) { |
| if (PrintTieredEvents) { |
| methodHandle mh(sd->method()); |
| print_event(REPROFILE, mh, mh, InvocationEntryBci, CompLevel_none); |
| } |
| MethodData* mdo = sd->method()->method_data(); |
| if (mdo != NULL) { |
| mdo->reset_start_counters(); |
| } |
| if (sd->is_top()) break; |
| } |
| } |
| |
| nmethod* SimpleThresholdPolicy::event(const methodHandle& method, const methodHandle& inlinee, |
| int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread) { |
| if (comp_level == CompLevel_none && |
| JvmtiExport::can_post_interpreter_events() && |
| thread->is_interp_only_mode()) { |
| return NULL; |
| } |
| if (CompileTheWorld || ReplayCompiles) { |
| // Don't trigger other compiles in testing mode |
| return NULL; |
| } |
| |
| handle_counter_overflow(method()); |
| if (method() != inlinee()) { |
| handle_counter_overflow(inlinee()); |
| } |
| |
| if (PrintTieredEvents) { |
| print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level); |
| } |
| |
| if (bci == InvocationEntryBci) { |
| method_invocation_event(method, inlinee, comp_level, nm, thread); |
| } else { |
| // method == inlinee if the event originated in the main method |
| method_back_branch_event(method, inlinee, bci, comp_level, nm, thread); |
| // Check if event led to a higher level OSR compilation |
| nmethod* osr_nm = inlinee->lookup_osr_nmethod_for(bci, comp_level, false); |
| if (osr_nm != NULL && osr_nm->comp_level() > comp_level) { |
| // Perform OSR with new nmethod |
| return osr_nm; |
| } |
| } |
| return NULL; |
| } |
| |
| // Check if the method can be compiled, change level if necessary |
| void SimpleThresholdPolicy::compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread) { |
| assert(level <= TieredStopAtLevel, "Invalid compilation level"); |
| if (level == CompLevel_none) { |
| return; |
| } |
| if (level == CompLevel_aot) { |
| if (mh->has_aot_code()) { |
| if (PrintTieredEvents) { |
| print_event(COMPILE, mh, mh, bci, level); |
| } |
| MutexLocker ml(Compile_lock); |
| NoSafepointVerifier nsv; |
| if (mh->has_aot_code() && mh->code() != mh->aot_code()) { |
| mh->aot_code()->make_entrant(); |
| if (mh->has_compiled_code()) { |
| mh->code()->make_not_entrant(); |
| } |
| Method::set_code(mh, mh->aot_code()); |
| } |
| } |
| return; |
| } |
| |
| // Check if the method can be compiled. If it cannot be compiled with C1, continue profiling |
| // in the interpreter and then compile with C2 (the transition function will request that, |
| // see common() ). If the method cannot be compiled with C2 but still can with C1, compile it with |
| // pure C1. |
| if (!can_be_compiled(mh, level)) { |
| if (level == CompLevel_full_optimization && can_be_compiled(mh, CompLevel_simple)) { |
| compile(mh, bci, CompLevel_simple, thread); |
| } |
| return; |
| } |
| if (bci != InvocationEntryBci && mh->is_not_osr_compilable(level)) { |
| return; |
| } |
| if (!CompileBroker::compilation_is_in_queue(mh)) { |
| if (PrintTieredEvents) { |
| print_event(COMPILE, mh, mh, bci, level); |
| } |
| submit_compile(mh, bci, level, thread); |
| } |
| } |
| |
| // Tell the broker to compile the method |
| void SimpleThresholdPolicy::submit_compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread) { |
| int hot_count = (bci == InvocationEntryBci) ? mh->invocation_count() : mh->backedge_count(); |
| CompileBroker::compile_method(mh, bci, level, mh, hot_count, CompileTask::Reason_Tiered, thread); |
| } |
| |
| // Call and loop predicates determine whether a transition to a higher |
| // compilation level should be performed (pointers to predicate functions |
| // are passed to common() transition function). |
| bool SimpleThresholdPolicy::loop_predicate(int i, int b, CompLevel cur_level, Method* method) { |
| switch(cur_level) { |
| case CompLevel_aot: { |
| return loop_predicate_helper<CompLevel_aot>(i, b, 1.0, method); |
| } |
| case CompLevel_none: |
| case CompLevel_limited_profile: { |
| return loop_predicate_helper<CompLevel_none>(i, b, 1.0, method); |
| } |
| case CompLevel_full_profile: { |
| return loop_predicate_helper<CompLevel_full_profile>(i, b, 1.0, method); |
| } |
| default: |
| return true; |
| } |
| } |
| |
| bool SimpleThresholdPolicy::call_predicate(int i, int b, CompLevel cur_level, Method* method) { |
| switch(cur_level) { |
| case CompLevel_aot: { |
| return call_predicate_helper<CompLevel_aot>(i, b, 1.0, method); |
| } |
| case CompLevel_none: |
| case CompLevel_limited_profile: { |
| return call_predicate_helper<CompLevel_none>(i, b, 1.0, method); |
| } |
| case CompLevel_full_profile: { |
| return call_predicate_helper<CompLevel_full_profile>(i, b, 1.0, method); |
| } |
| default: |
| return true; |
| } |
| } |
| |
| // Determine is a method is mature. |
| bool SimpleThresholdPolicy::is_mature(Method* method) { |
| if (is_trivial(method)) return true; |
| MethodData* mdo = method->method_data(); |
| if (mdo != NULL) { |
| int i = mdo->invocation_count(); |
| int b = mdo->backedge_count(); |
| double k = ProfileMaturityPercentage / 100.0; |
| return call_predicate_helper<CompLevel_full_profile>(i, b, k, method) || |
| loop_predicate_helper<CompLevel_full_profile>(i, b, k, method); |
| } |
| return false; |
| } |
| |
| // Common transition function. Given a predicate determines if a method should transition to another level. |
| CompLevel SimpleThresholdPolicy::common(Predicate p, Method* method, CompLevel cur_level) { |
| CompLevel next_level = cur_level; |
| int i = method->invocation_count(); |
| int b = method->backedge_count(); |
| |
| if (is_trivial(method) && cur_level != CompLevel_aot) { |
| next_level = CompLevel_simple; |
| } else { |
| switch(cur_level) { |
| case CompLevel_aot: { |
| if ((this->*p)(i, b, cur_level, method)) { |
| next_level = CompLevel_full_profile; |
| } |
| } |
| break; |
| case CompLevel_none: |
| // If we were at full profile level, would we switch to full opt? |
| if (common(p, method, CompLevel_full_profile) == CompLevel_full_optimization) { |
| next_level = CompLevel_full_optimization; |
| } else if ((this->*p)(i, b, cur_level, method)) { |
| next_level = CompLevel_full_profile; |
| } |
| break; |
| case CompLevel_limited_profile: |
| case CompLevel_full_profile: |
| { |
| MethodData* mdo = method->method_data(); |
| if (mdo != NULL) { |
| if (mdo->would_profile()) { |
| int mdo_i = mdo->invocation_count_delta(); |
| int mdo_b = mdo->backedge_count_delta(); |
| if ((this->*p)(mdo_i, mdo_b, cur_level, method)) { |
| next_level = CompLevel_full_optimization; |
| } |
| } else { |
| next_level = CompLevel_full_optimization; |
| } |
| } |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| return MIN2(next_level, (CompLevel)TieredStopAtLevel); |
| } |
| |
| // Determine if a method should be compiled with a normal entry point at a different level. |
| CompLevel SimpleThresholdPolicy::call_event(Method* method, CompLevel cur_level, JavaThread* thread) { |
| CompLevel osr_level = MIN2((CompLevel) method->highest_osr_comp_level(), |
| common(&SimpleThresholdPolicy::loop_predicate, method, cur_level)); |
| CompLevel next_level = common(&SimpleThresholdPolicy::call_predicate, method, cur_level); |
| |
| // If OSR method level is greater than the regular method level, the levels should be |
| // equalized by raising the regular method level in order to avoid OSRs during each |
| // invocation of the method. |
| if (osr_level == CompLevel_full_optimization && cur_level == CompLevel_full_profile) { |
| MethodData* mdo = method->method_data(); |
| guarantee(mdo != NULL, "MDO should not be NULL"); |
| if (mdo->invocation_count() >= 1) { |
| next_level = CompLevel_full_optimization; |
| } |
| } else { |
| next_level = MAX2(osr_level, next_level); |
| } |
| #if INCLUDE_JVMCI |
| if (UseJVMCICompiler) { |
| next_level = JVMCIRuntime::adjust_comp_level(method, false, next_level, thread); |
| } |
| #endif |
| return next_level; |
| } |
| |
| // Determine if we should do an OSR compilation of a given method. |
| CompLevel SimpleThresholdPolicy::loop_event(Method* method, CompLevel cur_level, JavaThread* thread) { |
| CompLevel next_level = common(&SimpleThresholdPolicy::loop_predicate, method, cur_level); |
| if (cur_level == CompLevel_none) { |
| // If there is a live OSR method that means that we deopted to the interpreter |
| // for the transition. |
| CompLevel osr_level = MIN2((CompLevel)method->highest_osr_comp_level(), next_level); |
| if (osr_level > CompLevel_none) { |
| return osr_level; |
| } |
| } |
| #if INCLUDE_JVMCI |
| if (UseJVMCICompiler) { |
| next_level = JVMCIRuntime::adjust_comp_level(method, true, next_level, thread); |
| } |
| #endif |
| return next_level; |
| } |
| |
| |
| // Handle the invocation event. |
| void SimpleThresholdPolicy::method_invocation_event(const methodHandle& mh, const methodHandle& imh, |
| CompLevel level, CompiledMethod* nm, JavaThread* thread) { |
| if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) { |
| CompLevel next_level = call_event(mh(), level, thread); |
| if (next_level != level) { |
| compile(mh, InvocationEntryBci, next_level, thread); |
| } |
| } |
| } |
| |
| // Handle the back branch event. Notice that we can compile the method |
| // with a regular entry from here. |
| void SimpleThresholdPolicy::method_back_branch_event(const methodHandle& mh, const methodHandle& imh, |
| int bci, CompLevel level, CompiledMethod* nm, JavaThread* thread) { |
| // If the method is already compiling, quickly bail out. |
| if (is_compilation_enabled() && !CompileBroker::compilation_is_in_queue(mh)) { |
| // Use loop event as an opportunity to also check there's been |
| // enough calls. |
| CompLevel cur_level = comp_level(mh()); |
| CompLevel next_level = call_event(mh(), cur_level, thread); |
| CompLevel next_osr_level = loop_event(mh(), level, thread); |
| |
| next_level = MAX2(next_level, |
| next_osr_level < CompLevel_full_optimization ? next_osr_level : cur_level); |
| bool is_compiling = false; |
| if (next_level != cur_level) { |
| compile(mh, InvocationEntryBci, next_level, thread); |
| is_compiling = true; |
| } |
| |
| // Do the OSR version |
| if (!is_compiling && next_osr_level != level) { |
| compile(mh, bci, next_osr_level, thread); |
| } |
| } |
| } |
| |
| #endif |