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