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 #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 size() {
122 return align_up((int)sizeof(MethodCounters), wordSize) / wordSize;
123 }
124
125 void clear_counters();
126
127 #if defined(COMPILER2) || INCLUDE_JVMCI
128
129 int interpreter_invocation_count() {
130 return _interpreter_invocation_count;
131 }
132 void set_interpreter_invocation_count(int count) {
133 _interpreter_invocation_count = count;
134 }
135 int increment_interpreter_invocation_count() {
136 return ++_interpreter_invocation_count;
137 }
138
139 void interpreter_throwout_increment() {
140 if (_interpreter_throwout_count < 65534) {
141 _interpreter_throwout_count++;
142 }
143 }
144 int interpreter_throwout_count() const {
145 return _interpreter_throwout_count;
146 }
147 void set_interpreter_throwout_count(int count) {
148 _interpreter_throwout_count = count;
149 }
150
151 #else // defined(COMPILER2) || INCLUDE_JVMCI
152
153 int interpreter_invocation_count() {
154 return 0;
155 }
156 void set_interpreter_invocation_count(int count) {
157 assert(count == 0, "count must be 0");
158 }
159
160 int interpreter_throwout_count() const {
161 return 0;
162 }
163 void set_interpreter_throwout_count(int count) {
164 assert(count == 0, "count must be 0");
165 }
166
167 #endif // defined(COMPILER2) || INCLUDE_JVMCI
168
169 #if INCLUDE_JVMTI
170 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
171 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
172 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
173 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
174 #endif
175
176 #ifdef TIERED
177 jlong prev_time() const { return _prev_time; }
178 void set_prev_time(jlong time) { _prev_time = time; }
179 float rate() const { return _rate; }
180 void set_rate(float rate) { _rate = rate; }
181 #endif
182
183 int highest_comp_level() const;
184 void set_highest_comp_level(int level);
185 int highest_osr_comp_level() const;
186 void set_highest_osr_comp_level(int level);
187
188 // invocation counter
189 InvocationCounter* invocation_counter() { return &_invocation_counter; }
190 InvocationCounter* backedge_counter() { return &_backedge_counter; }
191
192 int nmethod_age() {
193 return _nmethod_age;
194 }
195 void set_nmethod_age(int age) {
196 _nmethod_age = age;
197 }
198 void reset_nmethod_age() {
199 set_nmethod_age(HotMethodDetectionLimit);
200 }
201
202 static bool is_nmethod_hot(int age) { return age <= 0; }
203 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; }
204 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; }
205
206 static ByteSize nmethod_age_offset() {
207 return byte_offset_of(MethodCounters, _nmethod_age);
208 }
209
210 #if defined(COMPILER2) || INCLUDE_JVMCI
211
212 static ByteSize interpreter_invocation_counter_offset() {
213 return byte_offset_of(MethodCounters, _interpreter_invocation_count);
214 }
215
216 static int interpreter_invocation_counter_offset_in_bytes() {
217 return offset_of(MethodCounters, _interpreter_invocation_count);
218 }
219
220 #else // defined(COMPILER2) || INCLUDE_JVMCI
221
222 static ByteSize interpreter_invocation_counter_offset() {
223 ShouldNotReachHere();
224 return in_ByteSize(0);
225 }
226
227 #endif // defined(COMPILER2) || INCLUDE_JVMCI
228
229 static ByteSize invocation_counter_offset() {
230 return byte_offset_of(MethodCounters, _invocation_counter);
231 }
232
233 static ByteSize backedge_counter_offset() {
234 return byte_offset_of(MethodCounters, _backedge_counter);
235 }
236
237 static ByteSize interpreter_invocation_limit_offset() {
238 return byte_offset_of(MethodCounters, _interpreter_invocation_limit);
239 }
240
241 static ByteSize interpreter_backward_branch_limit_offset() {
242 return byte_offset_of(MethodCounters, _interpreter_backward_branch_limit);
243 }
244
245 static ByteSize interpreter_profile_limit_offset() {
246 return byte_offset_of(MethodCounters, _interpreter_profile_limit);
247 }
248
249 static ByteSize invoke_mask_offset() {
250 return byte_offset_of(MethodCounters, _invoke_mask);
251 }
252
253 static ByteSize backedge_mask_offset() {
254 return byte_offset_of(MethodCounters, _backedge_mask);
255 }
256
257 virtual const char* internal_name() const { return "{method counters}"; }
258 virtual void print_value_on(outputStream* st) const;
259
260 };
261 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP