1 /* 2 * Copyright (c) 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 #ifndef SHARE_VM_OOPS_METHODCOUNTERS_HPP 26 #define SHARE_VM_OOPS_METHODCOUNTERS_HPP 27 28 #include "oops/metadata.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "interpreter/invocationCounter.hpp" 31 #include "runtime/arguments.hpp" 32 33 class MethodCounters: public MetaspaceObj { 34 friend class VMStructs; 35 friend class JVMCIVMStructs; 36 private: 37 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 38 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 39 u2 _number_of_breakpoints; // fullspeed debugging support 40 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 41 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 42 // NMethod age is a counter for warm methods detection in the code cache sweeper. 43 // The counter is reset by the sweeper and is decremented by some of the compiled 44 // code. The counter values are interpreted as follows: 45 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 46 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 47 // to figure out which methods can be flushed. 48 // 3. (INT_MIN..0] - method is hot and will deopt and get 49 // recompiled without the counters 50 int _nmethod_age; 51 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 52 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 53 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 54 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 55 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 56 #ifdef TIERED 57 float _rate; // Events (invocation and backedge counter increments) per millisecond 58 jlong _prev_time; // Previous time the rate was acquired 59 u1 _highest_comp_level; // Highest compile level this method has ever seen. 60 u1 _highest_osr_comp_level; // Same for OSR level 61 #endif 62 63 MethodCounters(methodHandle mh) : _interpreter_invocation_count(0), 64 _interpreter_throwout_count(0), 65 _number_of_breakpoints(0), 66 _nmethod_age(INT_MAX) 67 #ifdef TIERED 68 , _rate(0), 69 _prev_time(0), 70 _highest_comp_level(0), 71 _highest_osr_comp_level(0) 72 #endif 73 { 74 invocation_counter()->init(); 75 backedge_counter()->init(); 76 77 if (StressCodeAging) { 78 set_nmethod_age(HotMethodDetectionLimit); 79 } 80 81 // Set per-method thresholds. 82 double scale = 1.0; 83 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 84 85 int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); 86 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 87 if (ProfileInterpreter) { 88 // If interpreter profiling is enabled, the backward branch limit 89 // is compared against the method data counter rather than an invocation 90 // counter, therefore no shifting of bits is required. 91 _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 92 } else { 93 _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; 94 } 95 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 96 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 97 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 98 } 99 100 public: 101 static MethodCounters* allocate(methodHandle mh, TRAPS); 102 103 void deallocate_contents(ClassLoaderData* loader_data) {} 104 DEBUG_ONLY(bool on_stack() { return false; }) // for template 105 106 static int size() { return sizeof(MethodCounters) / wordSize; } 107 108 bool is_klass() const { return false; } 109 110 void clear_counters(); 111 112 int interpreter_invocation_count() { 113 return _interpreter_invocation_count; 114 } 115 void set_interpreter_invocation_count(int count) { 116 _interpreter_invocation_count = count; 117 } 118 int increment_interpreter_invocation_count() { 119 return ++_interpreter_invocation_count; 120 } 121 122 void interpreter_throwout_increment() { 123 if (_interpreter_throwout_count < 65534) { 124 _interpreter_throwout_count++; 125 } 126 } 127 int interpreter_throwout_count() const { 128 return _interpreter_throwout_count; 129 } 130 void set_interpreter_throwout_count(int count) { 131 _interpreter_throwout_count = count; 132 } 133 134 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 135 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 136 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 137 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 138 139 #ifdef TIERED 140 jlong prev_time() const { return _prev_time; } 141 void set_prev_time(jlong time) { _prev_time = time; } 142 float rate() const { return _rate; } 143 void set_rate(float rate) { _rate = rate; } 144 #endif 145 146 int highest_comp_level() const; 147 void set_highest_comp_level(int level); 148 int highest_osr_comp_level() const; 149 void set_highest_osr_comp_level(int level); 150 151 // invocation counter 152 InvocationCounter* invocation_counter() { return &_invocation_counter; } 153 InvocationCounter* backedge_counter() { return &_backedge_counter; } 154 155 int nmethod_age() { 156 return _nmethod_age; 157 } 158 void set_nmethod_age(int age) { 159 _nmethod_age = age; 160 } 161 void reset_nmethod_age() { 162 set_nmethod_age(HotMethodDetectionLimit); 163 } 164 165 static bool is_nmethod_hot(int age) { return age <= 0; } 166 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } 167 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 168 169 static ByteSize nmethod_age_offset() { 170 return byte_offset_of(MethodCounters, _nmethod_age); 171 } 172 173 static ByteSize interpreter_invocation_counter_offset() { 174 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 175 } 176 177 static ByteSize invocation_counter_offset() { 178 return byte_offset_of(MethodCounters, _invocation_counter); 179 } 180 181 static ByteSize backedge_counter_offset() { 182 return byte_offset_of(MethodCounters, _backedge_counter); 183 } 184 185 static int interpreter_invocation_counter_offset_in_bytes() { 186 return offset_of(MethodCounters, _interpreter_invocation_count); 187 } 188 189 static ByteSize interpreter_invocation_limit_offset() { 190 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 191 } 192 193 static ByteSize interpreter_backward_branch_limit_offset() { 194 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 195 } 196 197 static ByteSize interpreter_profile_limit_offset() { 198 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 199 } 200 201 static ByteSize invoke_mask_offset() { 202 return byte_offset_of(MethodCounters, _invoke_mask); 203 } 204 205 static ByteSize backedge_mask_offset() { 206 return byte_offset_of(MethodCounters, _backedge_mask); 207 } 208 }; 209 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP