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