1 /* 2 * Copyright (c) 2013, 2017, 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 #include "utilities/align.hpp" 33 34 class MethodCounters : public Metadata { 35 friend class VMStructs; 36 friend class JVMCIVMStructs; 37 private: 38 #if INCLUDE_AOT 39 Method* _method; // Back link to Method 40 #endif 41 #if defined(COMPILER2) || INCLUDE_JVMCI 42 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 43 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 44 #endif 45 #if INCLUDE_JVMTI 46 u2 _number_of_breakpoints; // fullspeed debugging support 47 #endif 48 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 49 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 50 // NMethod age is a counter for warm methods detection in the code cache sweeper. 51 // The counter is reset by the sweeper and is decremented by some of the compiled 52 // code. The counter values are interpreted as follows: 53 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 54 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 55 // to figure out which methods can be flushed. 56 // 3. (INT_MIN..0] - method is hot and will deopt and get 57 // recompiled without the counters 58 int _nmethod_age; 59 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 60 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 61 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 62 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 63 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 64 #ifdef TIERED 65 float _rate; // Events (invocation and backedge counter increments) per millisecond 66 jlong _prev_time; // Previous time the rate was acquired 67 u1 _highest_comp_level; // Highest compile level this method has ever seen. 68 u1 _highest_osr_comp_level; // Same for OSR level 69 #endif 70 71 MethodCounters(methodHandle mh) : 72 #if INCLUDE_AOT 73 _method(mh()), 74 #endif 75 _nmethod_age(INT_MAX) 76 #ifdef TIERED 77 , _rate(0), 78 _prev_time(0), 79 _highest_comp_level(0), 80 _highest_osr_comp_level(0) 81 #endif 82 { 83 set_interpreter_invocation_count(0); 84 set_interpreter_throwout_count(0); 85 JVMTI_ONLY(clear_number_of_breakpoints()); 86 invocation_counter()->init(); 87 backedge_counter()->init(); 88 89 if (StressCodeAging) { 90 set_nmethod_age(HotMethodDetectionLimit); 91 } 92 93 // Set per-method thresholds. 94 double scale = 1.0; 95 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 96 97 int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); 98 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 99 if (ProfileInterpreter) { 100 // If interpreter profiling is enabled, the backward branch limit 101 // is compared against the method data counter rather than an invocation 102 // counter, therefore no shifting of bits is required. 103 _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 104 } else { 105 _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; 106 } 107 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 108 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 109 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 110 } 111 112 public: 113 virtual bool is_methodCounters() const volatile { return true; } 114 115 static MethodCounters* allocate(methodHandle mh, TRAPS); 116 117 void deallocate_contents(ClassLoaderData* loader_data) {} 118 119 AOT_ONLY(Method* method() const { return _method; }) 120 121 static int method_counters_size() { 122 return align_up((int)sizeof(MethodCounters), wordSize) / wordSize; 123 } 124 virtual int size() const { 125 return method_counters_size(); 126 } 127 void metaspace_pointers_do(MetaspaceClosure* it); 128 MetaspaceObj::Type type() const { return MethodCountersType; } 129 void clear_counters(); 130 131 #if defined(COMPILER2) || INCLUDE_JVMCI 132 133 int interpreter_invocation_count() { 134 return _interpreter_invocation_count; 135 } 136 void set_interpreter_invocation_count(int count) { 137 _interpreter_invocation_count = count; 138 } 139 int increment_interpreter_invocation_count() { 140 return ++_interpreter_invocation_count; 141 } 142 143 void interpreter_throwout_increment() { 144 if (_interpreter_throwout_count < 65534) { 145 _interpreter_throwout_count++; 146 } 147 } 148 int interpreter_throwout_count() const { 149 return _interpreter_throwout_count; 150 } 151 void set_interpreter_throwout_count(int count) { 152 _interpreter_throwout_count = count; 153 } 154 155 #else // defined(COMPILER2) || INCLUDE_JVMCI 156 157 int interpreter_invocation_count() { 158 return 0; 159 } 160 void set_interpreter_invocation_count(int count) { 161 assert(count == 0, "count must be 0"); 162 } 163 164 int interpreter_throwout_count() const { 165 return 0; 166 } 167 void set_interpreter_throwout_count(int count) { 168 assert(count == 0, "count must be 0"); 169 } 170 171 #endif // defined(COMPILER2) || INCLUDE_JVMCI 172 173 #if INCLUDE_JVMTI 174 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 175 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 176 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 177 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 178 #endif 179 180 #ifdef TIERED 181 jlong prev_time() const { return _prev_time; } 182 void set_prev_time(jlong time) { _prev_time = time; } 183 float rate() const { return _rate; } 184 void set_rate(float rate) { _rate = rate; } 185 #endif 186 187 int highest_comp_level() const; 188 void set_highest_comp_level(int level); 189 int highest_osr_comp_level() const; 190 void set_highest_osr_comp_level(int level); 191 192 // invocation counter 193 InvocationCounter* invocation_counter() { return &_invocation_counter; } 194 InvocationCounter* backedge_counter() { return &_backedge_counter; } 195 196 int nmethod_age() { 197 return _nmethod_age; 198 } 199 void set_nmethod_age(int age) { 200 _nmethod_age = age; 201 } 202 void reset_nmethod_age() { 203 set_nmethod_age(HotMethodDetectionLimit); 204 } 205 206 static bool is_nmethod_hot(int age) { return age <= 0; } 207 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } 208 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 209 210 static ByteSize nmethod_age_offset() { 211 return byte_offset_of(MethodCounters, _nmethod_age); 212 } 213 214 #if defined(COMPILER2) || INCLUDE_JVMCI 215 216 static ByteSize interpreter_invocation_counter_offset() { 217 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 218 } 219 220 static int interpreter_invocation_counter_offset_in_bytes() { 221 return offset_of(MethodCounters, _interpreter_invocation_count); 222 } 223 224 #else // defined(COMPILER2) || INCLUDE_JVMCI 225 226 static ByteSize interpreter_invocation_counter_offset() { 227 ShouldNotReachHere(); 228 return in_ByteSize(0); 229 } 230 231 #endif // defined(COMPILER2) || INCLUDE_JVMCI 232 233 static ByteSize invocation_counter_offset() { 234 return byte_offset_of(MethodCounters, _invocation_counter); 235 } 236 237 static ByteSize backedge_counter_offset() { 238 return byte_offset_of(MethodCounters, _backedge_counter); 239 } 240 241 static ByteSize interpreter_invocation_limit_offset() { 242 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 243 } 244 245 static ByteSize interpreter_backward_branch_limit_offset() { 246 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 247 } 248 249 static ByteSize interpreter_profile_limit_offset() { 250 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 251 } 252 253 static ByteSize invoke_mask_offset() { 254 return byte_offset_of(MethodCounters, _invoke_mask); 255 } 256 257 static ByteSize backedge_mask_offset() { 258 return byte_offset_of(MethodCounters, _backedge_mask); 259 } 260 261 virtual const char* internal_name() const { return "{method counters}"; } 262 virtual void print_value_on(outputStream* st) const; 263 264 }; 265 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP