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 #if INCLUDE_JVMTI 42 u2 _number_of_breakpoints; // fullspeed debugging support 43 #endif 44 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 45 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 46 // NMethod age is a counter for warm methods detection in the code cache sweeper. 47 // The counter is reset by the sweeper and is decremented by some of the compiled 48 // code. The counter values are interpreted as follows: 49 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 50 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 51 // to figure out which methods can be flushed. 52 // 3. (INT_MIN..0] - method is hot and will deopt and get 53 // recompiled without the counters 54 int _nmethod_age; 55 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 56 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 57 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 58 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 59 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 60 #ifdef TIERED 61 float _rate; // Events (invocation and backedge counter increments) per millisecond 62 jlong _prev_time; // Previous time the rate was acquired 63 u1 _highest_comp_level; // Highest compile level this method has ever seen. 64 u1 _highest_osr_comp_level; // Same for OSR level 65 #endif 66 67 MethodCounters(methodHandle mh) : _nmethod_age(INT_MAX) 68 #ifdef TIERED 69 , _rate(0), 70 _prev_time(0), 71 _highest_comp_level(0), 72 _highest_osr_comp_level(0) 73 #endif 74 { 75 set_interpreter_invocation_count(0); 76 set_interpreter_throwout_count(0); 77 JVMTI_ONLY(clear_number_of_breakpoints()); 78 invocation_counter()->init(); 79 backedge_counter()->init(); 80 81 if (StressCodeAging) { 82 set_nmethod_age(HotMethodDetectionLimit); 83 } 84 85 // Set per-method thresholds. 86 double scale = 1.0; 87 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 88 89 int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); 90 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 91 if (ProfileInterpreter) { 92 // If interpreter profiling is enabled, the backward branch limit 93 // is compared against the method data counter rather than an invocation 94 // counter, therefore no shifting of bits is required. 95 _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 96 } else { 97 _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; 98 } 99 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 100 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 101 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 102 } 103 104 public: 105 static MethodCounters* allocate(methodHandle mh, TRAPS); 106 107 void deallocate_contents(ClassLoaderData* loader_data) {} 108 DEBUG_ONLY(bool on_stack() { return false; }) // for template 109 110 static int size() { return sizeof(MethodCounters) / wordSize; } 111 112 bool is_klass() const { return false; } 113 114 void clear_counters(); 115 116 #if defined(COMPILER2) || INCLUDE_JVMCI 117 118 int interpreter_invocation_count() { 119 return _interpreter_invocation_count; 120 } 121 void set_interpreter_invocation_count(int count) { 122 _interpreter_invocation_count = count; 123 } 124 int increment_interpreter_invocation_count() { 125 return ++_interpreter_invocation_count; 126 } 127 128 void interpreter_throwout_increment() { 129 if (_interpreter_throwout_count < 65534) { 130 _interpreter_throwout_count++; 131 } 132 } 133 int interpreter_throwout_count() const { 134 return _interpreter_throwout_count; 135 } 136 void set_interpreter_throwout_count(int count) { 137 _interpreter_throwout_count = count; 138 } 139 140 #else // defined(COMPILER2) || INCLUDE_JVMCI 141 142 int interpreter_invocation_count() { 143 return 0; 144 } 145 void set_interpreter_invocation_count(int count) { 146 assert(count == 0, "count must be 0"); 147 } 148 149 int interpreter_throwout_count() const { 150 return 0; 151 } 152 void set_interpreter_throwout_count(int count) { 153 assert(count == 0, "count must be 0"); 154 } 155 156 #endif // defined(COMPILER2) || INCLUDE_JVMCI 157 158 #if INCLUDE_JVMTI 159 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 160 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 161 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 162 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 163 #endif 164 165 #ifdef TIERED 166 jlong prev_time() const { return _prev_time; } 167 void set_prev_time(jlong time) { _prev_time = time; } 168 float rate() const { return _rate; } 169 void set_rate(float rate) { _rate = rate; } 170 #endif 171 172 int highest_comp_level() const; 173 void set_highest_comp_level(int level); 174 int highest_osr_comp_level() const; 175 void set_highest_osr_comp_level(int level); 176 177 // invocation counter 178 InvocationCounter* invocation_counter() { return &_invocation_counter; } 179 InvocationCounter* backedge_counter() { return &_backedge_counter; } 180 181 int nmethod_age() { 182 return _nmethod_age; 183 } 184 void set_nmethod_age(int age) { 185 _nmethod_age = age; 186 } 187 void reset_nmethod_age() { 188 set_nmethod_age(HotMethodDetectionLimit); 189 } 190 191 static bool is_nmethod_hot(int age) { return age <= 0; } 192 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } 193 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 194 195 static ByteSize nmethod_age_offset() { 196 return byte_offset_of(MethodCounters, _nmethod_age); 197 } 198 199 #if defined(COMPILER2) || INCLUDE_JVMCI 200 201 static ByteSize interpreter_invocation_counter_offset() { 202 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 203 } 204 205 static int interpreter_invocation_counter_offset_in_bytes() { 206 return offset_of(MethodCounters, _interpreter_invocation_count); 207 } 208 209 #else // defined(COMPILER2) || INCLUDE_JVMCI 210 211 static ByteSize interpreter_invocation_counter_offset() { 212 ShouldNotReachHere(); 213 return in_ByteSize(0); 214 } 215 216 #endif // defined(COMPILER2) || INCLUDE_JVMCI 217 218 static ByteSize invocation_counter_offset() { 219 return byte_offset_of(MethodCounters, _invocation_counter); 220 } 221 222 static ByteSize backedge_counter_offset() { 223 return byte_offset_of(MethodCounters, _backedge_counter); 224 } 225 226 static ByteSize interpreter_invocation_limit_offset() { 227 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 228 } 229 230 static ByteSize interpreter_backward_branch_limit_offset() { 231 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 232 } 233 234 static ByteSize interpreter_profile_limit_offset() { 235 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 236 } 237 238 static ByteSize invoke_mask_offset() { 239 return byte_offset_of(MethodCounters, _invoke_mask); 240 } 241 242 static ByteSize backedge_mask_offset() { 243 return byte_offset_of(MethodCounters, _backedge_mask); 244 } 245 }; 246 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP