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comparison src/share/vm/oops/methodCounters.hpp @ 10105:aeaca88565e6

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8010862: The Method counter fields used for profiling can be allocated lazily. Summary: Allocate the method's profiling related metadata until they are needed. Reviewed-by: coleenp, roland
author jiangli
date Tue, 09 Apr 2013 17:17:41 -0400
parents
children 836a62f43af9 631667807de7
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9055:dcdeb150988c 10105:aeaca88565e6
1 /*
2 * Copyright (c) 2013, 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 "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 }
75 int increment_interpreter_invocation_count() {
76 return ++_interpreter_invocation_count;
77 }
78
79 void interpreter_throwout_increment() {
80 if (_interpreter_throwout_count < 65534) {
81 _interpreter_throwout_count++;
82 }
83 }
84 int interpreter_throwout_count() const {
85 return _interpreter_throwout_count;
86 }
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