1 /* 2 * Copyright (c) 2013, 2018, 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/compilerDefinitions.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "interpreter/invocationCounter.hpp" 32 #include "runtime/arguments.hpp" 33 #include "utilities/align.hpp" 34 35 class MethodCounters : public Metadata { 36 friend class VMStructs; 37 friend class JVMCIVMStructs; 38 private: 39 // If you add a new field that points to any metaspace object, you 40 // must add this field to MethodCounters::metaspace_pointers_do(). 41 #if INCLUDE_AOT 42 Method* _method; // Back link to Method 43 #endif 44 #if COMPILER2_OR_JVMCI 45 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) 46 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting 47 #endif 48 #if INCLUDE_JVMTI 49 u2 _number_of_breakpoints; // fullspeed debugging support 50 #endif 51 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations 52 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations 53 // NMethod age is a counter for warm methods detection in the code cache sweeper. 54 // The counter is reset by the sweeper and is decremented by some of the compiled 55 // code. The counter values are interpreted as follows: 56 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted 57 // 2. [1..HotMethodDetectionLimit) - the method is warm, the counter is used 58 // to figure out which methods can be flushed. 59 // 3. (INT_MIN..0] - method is hot and will deopt and get 60 // recompiled without the counters 61 int _nmethod_age; 62 int _interpreter_invocation_limit; // per-method InterpreterInvocationLimit 63 int _interpreter_backward_branch_limit; // per-method InterpreterBackwardBranchLimit 64 int _interpreter_profile_limit; // per-method InterpreterProfileLimit 65 int _invoke_mask; // per-method Tier0InvokeNotifyFreqLog 66 int _backedge_mask; // per-method Tier0BackedgeNotifyFreqLog 67 #ifdef TIERED 68 float _rate; // Events (invocation and backedge counter increments) per millisecond 69 jlong _prev_time; // Previous time the rate was acquired 70 u1 _highest_comp_level; // Highest compile level this method has ever seen. 71 u1 _highest_osr_comp_level; // Same for OSR level 72 #endif 73 MethodCounters(const methodHandle & mh)74 MethodCounters(const methodHandle& mh) : 75 #if INCLUDE_AOT 76 _method(mh()), 77 #endif 78 _nmethod_age(INT_MAX) 79 #ifdef TIERED 80 , _rate(0), 81 _prev_time(0), 82 _highest_comp_level(0), 83 _highest_osr_comp_level(0) 84 #endif 85 { 86 set_interpreter_invocation_count(0); 87 set_interpreter_throwout_count(0); 88 JVMTI_ONLY(clear_number_of_breakpoints()); 89 invocation_counter()->init(); 90 backedge_counter()->init(); 91 92 if (StressCodeAging) { 93 set_nmethod_age(HotMethodDetectionLimit); 94 } 95 96 // Set per-method thresholds. 97 double scale = 1.0; 98 CompilerOracle::has_option_value(mh, "CompileThresholdScaling", scale); 99 100 int compile_threshold = CompilerConfig::scaled_compile_threshold(CompileThreshold, scale); 101 _interpreter_invocation_limit = compile_threshold << InvocationCounter::count_shift; 102 if (ProfileInterpreter) { 103 // If interpreter profiling is enabled, the backward branch limit 104 // is compared against the method data counter rather than an invocation 105 // counter, therefore no shifting of bits is required. 106 _interpreter_backward_branch_limit = (int)((int64_t)compile_threshold * (OnStackReplacePercentage - InterpreterProfilePercentage) / 100); 107 } else { 108 _interpreter_backward_branch_limit = (int)(((int64_t)compile_threshold * OnStackReplacePercentage / 100) << InvocationCounter::count_shift); 109 } 110 _interpreter_profile_limit = ((compile_threshold * InterpreterProfilePercentage) / 100) << InvocationCounter::count_shift; 111 _invoke_mask = right_n_bits(CompilerConfig::scaled_freq_log(Tier0InvokeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 112 _backedge_mask = right_n_bits(CompilerConfig::scaled_freq_log(Tier0BackedgeNotifyFreqLog, scale)) << InvocationCounter::count_shift; 113 } 114 115 public: is_methodCounters() const116 virtual bool is_methodCounters() const volatile { return true; } 117 118 static MethodCounters* allocate(const methodHandle& mh, TRAPS); 119 deallocate_contents(ClassLoaderData * loader_data)120 void deallocate_contents(ClassLoaderData* loader_data) {} 121 AOT_ONLY(Method * method ()const{ return _method; })122 AOT_ONLY(Method* method() const { return _method; }) 123 124 static int method_counters_size() { 125 return align_up((int)sizeof(MethodCounters), wordSize) / wordSize; 126 } size() const127 virtual int size() const { 128 return method_counters_size(); 129 } 130 void metaspace_pointers_do(MetaspaceClosure* it); type() const131 MetaspaceObj::Type type() const { return MethodCountersType; } 132 void clear_counters(); 133 134 #if COMPILER2_OR_JVMCI 135 interpreter_invocation_count()136 int interpreter_invocation_count() { 137 return _interpreter_invocation_count; 138 } set_interpreter_invocation_count(int count)139 void set_interpreter_invocation_count(int count) { 140 _interpreter_invocation_count = count; 141 } increment_interpreter_invocation_count()142 int increment_interpreter_invocation_count() { 143 return ++_interpreter_invocation_count; 144 } 145 interpreter_throwout_increment()146 void interpreter_throwout_increment() { 147 if (_interpreter_throwout_count < 65534) { 148 _interpreter_throwout_count++; 149 } 150 } interpreter_throwout_count() const151 int interpreter_throwout_count() const { 152 return _interpreter_throwout_count; 153 } set_interpreter_throwout_count(int count)154 void set_interpreter_throwout_count(int count) { 155 _interpreter_throwout_count = count; 156 } 157 158 #else // COMPILER2_OR_JVMCI 159 interpreter_invocation_count()160 int interpreter_invocation_count() { 161 return 0; 162 } set_interpreter_invocation_count(int count)163 void set_interpreter_invocation_count(int count) { 164 assert(count == 0, "count must be 0"); 165 } 166 interpreter_throwout_count() const167 int interpreter_throwout_count() const { 168 return 0; 169 } set_interpreter_throwout_count(int count)170 void set_interpreter_throwout_count(int count) { 171 assert(count == 0, "count must be 0"); 172 } 173 174 #endif // COMPILER2_OR_JVMCI 175 176 #if INCLUDE_JVMTI number_of_breakpoints() const177 u2 number_of_breakpoints() const { return _number_of_breakpoints; } incr_number_of_breakpoints()178 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } decr_number_of_breakpoints()179 void decr_number_of_breakpoints() { --_number_of_breakpoints; } clear_number_of_breakpoints()180 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } 181 #endif 182 183 #ifdef TIERED prev_time() const184 jlong prev_time() const { return _prev_time; } set_prev_time(jlong time)185 void set_prev_time(jlong time) { _prev_time = time; } rate() const186 float rate() const { return _rate; } set_rate(float rate)187 void set_rate(float rate) { _rate = rate; } 188 #endif 189 190 int highest_comp_level() const; 191 void set_highest_comp_level(int level); 192 int highest_osr_comp_level() const; 193 void set_highest_osr_comp_level(int level); 194 195 // invocation counter invocation_counter()196 InvocationCounter* invocation_counter() { return &_invocation_counter; } backedge_counter()197 InvocationCounter* backedge_counter() { return &_backedge_counter; } 198 nmethod_age()199 int nmethod_age() { 200 return _nmethod_age; 201 } set_nmethod_age(int age)202 void set_nmethod_age(int age) { 203 _nmethod_age = age; 204 } reset_nmethod_age()205 void reset_nmethod_age() { 206 set_nmethod_age(HotMethodDetectionLimit); 207 } 208 is_nmethod_hot(int age)209 static bool is_nmethod_hot(int age) { return age <= 0; } is_nmethod_warm(int age)210 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; } is_nmethod_age_unset(int age)211 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; } 212 nmethod_age_offset()213 static ByteSize nmethod_age_offset() { 214 return byte_offset_of(MethodCounters, _nmethod_age); 215 } 216 217 #if COMPILER2_OR_JVMCI 218 interpreter_invocation_counter_offset()219 static ByteSize interpreter_invocation_counter_offset() { 220 return byte_offset_of(MethodCounters, _interpreter_invocation_count); 221 } 222 interpreter_invocation_counter_offset_in_bytes()223 static int interpreter_invocation_counter_offset_in_bytes() { 224 return offset_of(MethodCounters, _interpreter_invocation_count); 225 } 226 227 #else // COMPILER2_OR_JVMCI 228 interpreter_invocation_counter_offset()229 static ByteSize interpreter_invocation_counter_offset() { 230 ShouldNotReachHere(); 231 return in_ByteSize(0); 232 } 233 234 #endif // COMPILER2_OR_JVMCI 235 invocation_counter_offset()236 static ByteSize invocation_counter_offset() { 237 return byte_offset_of(MethodCounters, _invocation_counter); 238 } 239 backedge_counter_offset()240 static ByteSize backedge_counter_offset() { 241 return byte_offset_of(MethodCounters, _backedge_counter); 242 } 243 interpreter_invocation_limit_offset()244 static ByteSize interpreter_invocation_limit_offset() { 245 return byte_offset_of(MethodCounters, _interpreter_invocation_limit); 246 } 247 interpreter_backward_branch_limit_offset()248 static ByteSize interpreter_backward_branch_limit_offset() { 249 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit); 250 } 251 interpreter_profile_limit_offset()252 static ByteSize interpreter_profile_limit_offset() { 253 return byte_offset_of(MethodCounters, _interpreter_profile_limit); 254 } 255 invoke_mask_offset()256 static ByteSize invoke_mask_offset() { 257 return byte_offset_of(MethodCounters, _invoke_mask); 258 } 259 backedge_mask_offset()260 static ByteSize backedge_mask_offset() { 261 return byte_offset_of(MethodCounters, _backedge_mask); 262 } 263 internal_name() const264 virtual const char* internal_name() const { return "{method counters}"; } 265 virtual void print_value_on(outputStream* st) const; 266 267 }; 268 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP 269