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 "interpreter/invocationCounter.hpp"
30
31 class MethodCounters: public MetaspaceObj {
32 friend class VMStructs;
33 private:
34 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
35 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
36 u2 _number_of_breakpoints; // fullspeed debugging support
37 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
38 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
39
40 #ifdef TIERED
41 float _rate; // Events (invocation and backedge counter increments) per millisecond
42 jlong _prev_time; // Previous time the rate was acquired
43 #endif
44
45 MethodCounters() : _interpreter_invocation_count(0),
46 _interpreter_throwout_count(0),
47 _number_of_breakpoints(0)
48 #ifdef TIERED
49 , _rate(0),
50 _prev_time(0)
51 #endif
52 {
53 invocation_counter()->init();
54 backedge_counter()->init();
55 }
56
57 public:
58 static MethodCounters* allocate(ClassLoaderData* loader_data, TRAPS);
59
60 void deallocate_contents(ClassLoaderData* loader_data) {}
61 DEBUG_ONLY(bool on_stack() { return false; }) // for template
62
63 static int size() { return sizeof(MethodCounters) / wordSize; }
64
65 bool is_klass() const { return false; }
66
67 void clear_counters();
68
69 int interpreter_invocation_count() {
70 return _interpreter_invocation_count;
71 }
72 void set_interpreter_invocation_count(int count) {
73 _interpreter_invocation_count = count;
74 }
87 void set_interpreter_throwout_count(int count) {
88 _interpreter_throwout_count = count;
89 }
90
91 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
92 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
93 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
94 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
95
96 #ifdef TIERED
97 jlong prev_time() const { return _prev_time; }
98 void set_prev_time(jlong time) { _prev_time = time; }
99 float rate() const { return _rate; }
100 void set_rate(float rate) { _rate = rate; }
101 #endif
102
103 // invocation counter
104 InvocationCounter* invocation_counter() { return &_invocation_counter; }
105 InvocationCounter* backedge_counter() { return &_backedge_counter; }
106
107 static ByteSize interpreter_invocation_counter_offset() {
108 return byte_offset_of(MethodCounters, _interpreter_invocation_count);
109 }
110
111 static ByteSize invocation_counter_offset() {
112 return byte_offset_of(MethodCounters, _invocation_counter);
113 }
114
115 static ByteSize backedge_counter_offset() {
116 return byte_offset_of(MethodCounters, _backedge_counter);
117 }
118
119 static int interpreter_invocation_counter_offset_in_bytes() {
120 return offset_of(MethodCounters, _interpreter_invocation_count);
121 }
122
123 };
124 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP
|
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 "interpreter/invocationCounter.hpp"
30
31 class MethodCounters: public MetaspaceObj {
32 friend class VMStructs;
33 private:
34 // NMethod age is a counter for warm methods detection in the code cache sweeper.
35 // The counter is reset by the sweeper and is decremented by some of the compiled
36 // code. The counter values are interpreted as follows:
37 // 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted
38 // 2. (1..HotMethodDetectionLimit) - the method is warm, the counter is used
39 // to figure out which methods can be flushed.
40 // 3. (INT_MIN..0] - method is hot and will deopt and get
41 // recompiled without the counters
42 int _nmethod_age;
43 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
44 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
45 u2 _number_of_breakpoints; // fullspeed debugging support
46 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
47 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
48
49 #ifdef TIERED
50 float _rate; // Events (invocation and backedge counter increments) per millisecond
51 jlong _prev_time; // Previous time the rate was acquired
52 #endif
53
54 MethodCounters() : _nmethod_age(INT_MAX),
55 _interpreter_invocation_count(0),
56 _interpreter_throwout_count(0),
57 _number_of_breakpoints(0)
58 #ifdef TIERED
59 , _rate(0),
60 _prev_time(0)
61 #endif
62 {
63 invocation_counter()->init();
64 backedge_counter()->init();
65
66 if (StressCodeAging) {
67 set_nmethod_age(HotMethodDetectionLimit);
68 }
69 }
70
71 public:
72 static MethodCounters* allocate(ClassLoaderData* loader_data, TRAPS);
73
74 void deallocate_contents(ClassLoaderData* loader_data) {}
75 DEBUG_ONLY(bool on_stack() { return false; }) // for template
76
77 static int size() { return sizeof(MethodCounters) / wordSize; }
78
79 bool is_klass() const { return false; }
80
81 void clear_counters();
82
83 int interpreter_invocation_count() {
84 return _interpreter_invocation_count;
85 }
86 void set_interpreter_invocation_count(int count) {
87 _interpreter_invocation_count = count;
88 }
101 void set_interpreter_throwout_count(int count) {
102 _interpreter_throwout_count = count;
103 }
104
105 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
106 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
107 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
108 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
109
110 #ifdef TIERED
111 jlong prev_time() const { return _prev_time; }
112 void set_prev_time(jlong time) { _prev_time = time; }
113 float rate() const { return _rate; }
114 void set_rate(float rate) { _rate = rate; }
115 #endif
116
117 // invocation counter
118 InvocationCounter* invocation_counter() { return &_invocation_counter; }
119 InvocationCounter* backedge_counter() { return &_backedge_counter; }
120
121 int nmethod_age() {
122 return _nmethod_age;
123 }
124 void set_nmethod_age(int age) {
125 _nmethod_age = age;
126 }
127 void reset_nmethod_age() {
128 set_nmethod_age(HotMethodDetectionLimit);
129 }
130
131 static bool is_nmethod_hot(int age) { return age <= 0; }
132 static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; }
133 static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; }
134 static bool should_nmethod_age(int age);
135 static ByteSize nmethod_age_offset() {
136 return byte_offset_of(MethodCounters, _nmethod_age);
137 }
138
139 static ByteSize interpreter_invocation_counter_offset() {
140 return byte_offset_of(MethodCounters, _interpreter_invocation_count);
141 }
142
143 static ByteSize invocation_counter_offset() {
144 return byte_offset_of(MethodCounters, _invocation_counter);
145 }
146
147 static ByteSize backedge_counter_offset() {
148 return byte_offset_of(MethodCounters, _backedge_counter);
149 }
150
151 static int interpreter_invocation_counter_offset_in_bytes() {
152 return offset_of(MethodCounters, _interpreter_invocation_count);
153 }
154
155 };
156 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP
|