1 /* 2 * Copyright (c) 2013, 2016 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 #if defined(COMPILER2) || INCLUDE_JVMCI 38 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 39 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 40 #endif 41 u2 _number_of_breakpoints; // fullspeed debugging support 42 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 43 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 44 // NMethod age is a counter for warm methods detection in the code cache sweeper. 45 // The counter is reset by the sweeper and is decremented by some of the compiled 46 // code. The counter values are interpreted as follows: 47 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 48 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 49 // to figure out which methods can be flushed. 50 // 3. (INT_MIN..0] - method is hot and will deopt and get 51 // recompiled without the counters 52 int _nmethod_age; 53 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 54 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 55 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 56 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 57 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 58 #ifdef TIERED 59 float _rate; // Events (invocation and backedge counter increments) per millisecond 60 jlong _prev_time; // Previous time the rate was acquired 61 u1 _highest_comp_level; // Highest compile level this method has ever seen. 62 u1 _highest_osr_comp_level; // Same for OSR level 63 #endif 64 65 MethodCounters(methodHandle mh) : _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 set_interpreter_invocation_count(0); 75 set_interpreter_throwout_count(0); 76 invocation_counter()->init(); 77 backedge_counter()->init(); 78 79 if (StressCodeAging) { 80 set_nmethod_age(HotMethodDetectionLimit); 81 } 82 83 // Set per-method thresholds. 84 double scale = 1.0; 85 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 86 87 int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); 88 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 89 if (ProfileInterpreter) { 90 // If interpreter profiling is enabled, the backward branch limit 91 // is compared against the method data counter rather than an invocation 92 // counter, therefore no shifting of bits is required. 93 _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 94 } else { 95 _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; 96 } 97 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 98 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 99 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 100 } 101 102 public: 103 static MethodCounters* allocate(methodHandle mh, TRAPS); 104 105 void deallocate_contents(ClassLoaderData* loader_data) {} 106 DEBUG_ONLY(bool on_stack() { return false; }) // for template 107 108 static int size() { return sizeof(MethodCounters) / wordSize; } 109 110 bool is_klass() const { return false; } 111 112 void clear_counters(); 113 114 #if defined(COMPILER2) || INCLUDE_JVMCI 115 116 int interpreter_invocation_count() { 117 return _interpreter_invocation_count; 118 } 119 void set_interpreter_invocation_count(int count) { 120 _interpreter_invocation_count = count; 121 } 122 int increment_interpreter_invocation_count() { 123 return ++_interpreter_invocation_count; 124 } 125 126 void interpreter_throwout_increment() { 127 if (_interpreter_throwout_count < 65534) { 128 _interpreter_throwout_count++; 129 } 130 } 131 int interpreter_throwout_count() const { 132 return _interpreter_throwout_count; 133 } 134 void set_interpreter_throwout_count(int count) { 135 _interpreter_throwout_count = count; 136 } 137 138 #else // defined(COMPILER2) || INCLUDE_JVMCI 139 140 int interpreter_invocation_count() { 141 return 0; 142 } 143 void set_interpreter_invocation_count(int count) { 144 assert(count == 0, "count must be 0"); 145 } 146 147 int interpreter_throwout_count() const { 148 return 0; 149 } 150 void set_interpreter_throwout_count(int count) { 151 assert(count == 0, "count must be 0"); 152 } 153 154 #endif // defined(COMPILER2) || INCLUDE_JVMCI 155 156 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 157 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 158 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 159 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 160 161 #ifdef TIERED 162 jlong prev_time() const { return _prev_time; } 163 void set_prev_time(jlong time) { _prev_time = time; } 164 float rate() const { return _rate; } 165 void set_rate(float rate) { _rate = rate; } 166 #endif 167 168 int highest_comp_level() const; 169 void set_highest_comp_level(int level); 170 int highest_osr_comp_level() const; 171 void set_highest_osr_comp_level(int level); 172 173 // invocation counter 174 InvocationCounter* invocation_counter() { return &_invocation_counter; } 175 InvocationCounter* backedge_counter() { return &_backedge_counter; } 176 177 int nmethod_age() { 178 return _nmethod_age; 179 } 180 void set_nmethod_age(int age) { 181 _nmethod_age = age; 182 } 183 void reset_nmethod_age() { 184 set_nmethod_age(HotMethodDetectionLimit); 185 } 186 187 static bool is_nmethod_hot(int age) { return age <= 0; } 188 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } 189 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 190 191 static ByteSize nmethod_age_offset() { 192 return byte_offset_of(MethodCounters, _nmethod_age); 193 } 194 195 #if defined(COMPILER2) || INCLUDE_JVMCI 196 197 static ByteSize interpreter_invocation_counter_offset() { 198 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 199 } 200 201 static int interpreter_invocation_counter_offset_in_bytes() { 202 return offset_of(MethodCounters, _interpreter_invocation_count); 203 } 204 205 #else // defined(COMPILER2) || INCLUDE_JVMCI 206 207 static ByteSize interpreter_invocation_counter_offset() { 208 ShouldNotReachHere(); 209 return in_ByteSize(0); 210 } 211 212 #endif // defined(COMPILER2) || INCLUDE_JVMCI 213 214 static ByteSize invocation_counter_offset() { 215 return byte_offset_of(MethodCounters, _invocation_counter); 216 } 217 218 static ByteSize backedge_counter_offset() { 219 return byte_offset_of(MethodCounters, _backedge_counter); 220 } 221 222 static ByteSize interpreter_invocation_limit_offset() { 223 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 224 } 225 226 static ByteSize interpreter_backward_branch_limit_offset() { 227 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 228 } 229 230 static ByteSize interpreter_profile_limit_offset() { 231 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 232 } 233 234 static ByteSize invoke_mask_offset() { 235 return byte_offset_of(MethodCounters, _invoke_mask); 236 } 237 238 static ByteSize backedge_mask_offset() { 239 return byte_offset_of(MethodCounters, _backedge_mask); 240 } 241 }; 242 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP