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 you add a new field that points to any metaspace object, you 39 // must add this field to MethodCounters::metaspace_pointers_do(). 40 #if INCLUDE_AOT 41 Method* _method; // Back link to Method 42 #endif 43 #if COMPILER2_OR_JVMCI 44 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 45 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 46 #endif 47 #if INCLUDE_JVMTI 48 u2 _number_of_breakpoints; // fullspeed debugging support 49 #endif 50 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 51 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 52 // NMethod age is a counter for warm methods detection in the code cache sweeper. 53 // The counter is reset by the sweeper and is decremented by some of the compiled 54 // code. The counter values are interpreted as follows: 55 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 56 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 57 // to figure out which methods can be flushed. 58 // 3. (INT_MIN..0] - method is hot and will deopt and get 59 // recompiled without the counters 60 int _nmethod_age; 61 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 62 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 63 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 64 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 65 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 66 #ifdef TIERED 67 float _rate; // Events (invocation and backedge counter increments) per millisecond 68 jlong _prev_time; // Previous time the rate was acquired 69 u1 _highest_comp_level; // Highest compile level this method has ever seen. 70 u1 _highest_osr_comp_level; // Same for OSR level 71 #endif 72 73 MethodCounters(const methodHandle& mh) : 74 #if INCLUDE_AOT 75 _method(mh()), 76 #endif 77 _nmethod_age(INT_MAX) 78 #ifdef TIERED 79 , _rate(0), 80 _prev_time(0), 81 _highest_comp_level(0), 82 _highest_osr_comp_level(0) 83 #endif 84 { 85 set_interpreter_invocation_count(0); 86 set_interpreter_throwout_count(0); 87 JVMTI_ONLY(clear_number_of_breakpoints()); 88 invocation_counter()->init(); 89 backedge_counter()->init(); 90 91 if (StressCodeAging) { 92 set_nmethod_age(HotMethodDetectionLimit); 93 } 94 95 // Set per-method thresholds. 96 double scale = 1.0; 97 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 98 99 int compile_threshold = Arguments::scaled_compile_threshold(CompileThreshold, scale); 100 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 101 if (ProfileInterpreter) { 102 // If interpreter profiling is enabled, the backward branch limit 103 // is compared against the method data counter rather than an invocation 104 // counter, therefore no shifting of bits is required. 105 _interpreter_backward_branch_limit = (compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100; 106 } else { 107 _interpreter_backward_branch_limit = ((compile_threshold * OnStackReplacePercentage) / 100) << InvocationCounter::count_shift; 108 } 109 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 110 _invoke_mask = right_n_bits(Arguments::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 111 _backedge_mask = right_n_bits(Arguments::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 112 } 113 114 public: 115 virtual bool is_methodCounters() const volatile { return true; } 116 117 static MethodCounters* allocate(const methodHandle& mh, TRAPS); 118 119 void deallocate_contents(ClassLoaderData* loader_data) {} 120 121 AOT_ONLY(Method* method() const { return _method; }) 122 123 static int method_counters_size() { 124 return align_up((int)sizeof(MethodCounters), wordSize) / wordSize; 125 } 126 virtual int size() const { 127 return method_counters_size(); 128 } 129 void metaspace_pointers_do(MetaspaceClosure* it); 130 MetaspaceObj::Type type() const { return MethodCountersType; } 131 void clear_counters(); 132 133 #if COMPILER2_OR_JVMCI 134 135 int interpreter_invocation_count() { 136 return _interpreter_invocation_count; 137 } 138 void set_interpreter_invocation_count(int count) { 139 _interpreter_invocation_count = count; 140 } 141 int increment_interpreter_invocation_count() { 142 return ++_interpreter_invocation_count; 143 } 144 145 void interpreter_throwout_increment() { 146 if (_interpreter_throwout_count < 65534) { 147 _interpreter_throwout_count++; 148 } 149 } 150 int interpreter_throwout_count() const { 151 return _interpreter_throwout_count; 152 } 153 void set_interpreter_throwout_count(int count) { 154 _interpreter_throwout_count = count; 155 } 156 157 #else // COMPILER2_OR_JVMCI 158 159 int interpreter_invocation_count() { 160 return 0; 161 } 162 void set_interpreter_invocation_count(int count) { 163 assert(count == 0, "count must be 0"); 164 } 165 166 int interpreter_throwout_count() const { 167 return 0; 168 } 169 void set_interpreter_throwout_count(int count) { 170 assert(count == 0, "count must be 0"); 171 } 172 173 #endif // COMPILER2_OR_JVMCI 174 175 #if INCLUDE_JVMTI 176 u2 number_of_breakpoints() const { return _number_of_breakpoints; } 177 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } 178 void decr_number_of_breakpoints() { --_number_of_breakpoints; } 179 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 180 #endif 181 182 #ifdef TIERED 183 jlong prev_time() const { return _prev_time; } 184 void set_prev_time(jlong time) { _prev_time = time; } 185 float rate() const { return _rate; } 186 void set_rate(float rate) { _rate = rate; } 187 #endif 188 189 int highest_comp_level() const; 190 void set_highest_comp_level(int level); 191 int highest_osr_comp_level() const; 192 void set_highest_osr_comp_level(int level); 193 194 // invocation counter 195 InvocationCounter* invocation_counter() { return &_invocation_counter; } 196 InvocationCounter* backedge_counter() { return &_backedge_counter; } 197 198 int nmethod_age() { 199 return _nmethod_age; 200 } 201 void set_nmethod_age(int age) { 202 _nmethod_age = age; 203 } 204 void reset_nmethod_age() { 205 set_nmethod_age(HotMethodDetectionLimit); 206 } 207 208 static bool is_nmethod_hot(int age) { return age <= 0; } 209 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } 210 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 211 212 static ByteSize nmethod_age_offset() { 213 return byte_offset_of(MethodCounters, _nmethod_age); 214 } 215 216 #if COMPILER2_OR_JVMCI 217 218 static ByteSize interpreter_invocation_counter_offset() { 219 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 220 } 221 222 static int interpreter_invocation_counter_offset_in_bytes() { 223 return offset_of(MethodCounters, _interpreter_invocation_count); 224 } 225 226 #else // COMPILER2_OR_JVMCI 227 228 static ByteSize interpreter_invocation_counter_offset() { 229 ShouldNotReachHere(); 230 return in_ByteSize(0); 231 } 232 233 #endif // COMPILER2_OR_JVMCI 234 235 static ByteSize invocation_counter_offset() { 236 return byte_offset_of(MethodCounters, _invocation_counter); 237 } 238 239 static ByteSize backedge_counter_offset() { 240 return byte_offset_of(MethodCounters, _backedge_counter); 241 } 242 243 static ByteSize interpreter_invocation_limit_offset() { 244 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 245 } 246 247 static ByteSize interpreter_backward_branch_limit_offset() { 248 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 249 } 250 251 static ByteSize interpreter_profile_limit_offset() { 252 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 253 } 254 255 static ByteSize invoke_mask_offset() { 256 return byte_offset_of(MethodCounters, _invoke_mask); 257 } 258 259 static ByteSize backedge_mask_offset() { 260 return byte_offset_of(MethodCounters, _backedge_mask); 261 } 262 263 virtual const char* internal_name() const { return "{method counters}"; } 264 virtual void print_value_on(outputStream* st) const; 265 266 }; 267 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP