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