21 * questions. |
21 * questions. |
22 * |
22 * |
23 */ |
23 */ |
24 |
24 |
25 #include "precompiled.hpp" |
25 #include "precompiled.hpp" |
26 #include "jfr/leakprofiler/emitEventOperation.hpp" |
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27 #include "jfr/leakprofiler/leakProfiler.hpp" |
26 #include "jfr/leakprofiler/leakProfiler.hpp" |
28 #include "jfr/leakprofiler/startOperation.hpp" |
27 #include "jfr/leakprofiler/startOperation.hpp" |
29 #include "jfr/leakprofiler/stopOperation.hpp" |
28 #include "jfr/leakprofiler/stopOperation.hpp" |
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29 #include "jfr/leakprofiler/checkpoint/eventEmitter.hpp" |
30 #include "jfr/leakprofiler/sampling/objectSampler.hpp" |
30 #include "jfr/leakprofiler/sampling/objectSampler.hpp" |
31 #include "jfr/recorder/service/jfrOptionSet.hpp" |
31 #include "jfr/recorder/service/jfrOptionSet.hpp" |
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32 #include "logging/log.hpp" |
32 #include "memory/iterator.hpp" |
33 #include "memory/iterator.hpp" |
33 #include "oops/oop.hpp" |
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34 #include "runtime/atomic.hpp" |
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35 #include "runtime/orderAccess.hpp" |
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36 #include "runtime/thread.inline.hpp" |
34 #include "runtime/thread.inline.hpp" |
37 #include "runtime/vmThread.hpp" |
35 #include "runtime/vmThread.hpp" |
38 #include "utilities/ostream.hpp" |
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39 |
36 |
40 // Only to be updated during safepoint |
37 bool LeakProfiler::is_running() { |
41 ObjectSampler* LeakProfiler::_object_sampler = NULL; |
38 return ObjectSampler::is_created(); |
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39 } |
42 |
40 |
43 static volatile jbyte suspended = 0; |
41 bool LeakProfiler::start(int sample_count) { |
44 bool LeakProfiler::start(jint sample_count) { |
42 if (is_running()) { |
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43 return true; |
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44 } |
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45 |
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46 // Allows user to disable leak profiler on command line by setting queue size to zero. |
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47 if (sample_count == 0) { |
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48 return false; |
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49 } |
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50 |
45 if (UseZGC) { |
51 if (UseZGC) { |
46 log_warning(jfr)("LeakProfiler is currently not supported in combination with ZGC"); |
52 log_warning(jfr)("LeakProfiler is currently not supported in combination with ZGC"); |
47 return false; |
53 return false; |
48 } |
54 } |
49 |
55 |
50 if (UseShenandoahGC) { |
56 if (UseShenandoahGC) { |
51 log_warning(jfr)("LeakProfiler is currently not supported in combination with Shenandoah GC"); |
57 log_warning(jfr)("LeakProfiler is currently not supported in combination with Shenandoah GC"); |
52 return false; |
58 return false; |
53 } |
59 } |
54 |
60 |
55 if (_object_sampler != NULL) { |
61 assert(!is_running(), "invariant"); |
56 // already started |
62 assert(sample_count > 0, "invariant"); |
57 return true; |
63 |
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64 // schedule the safepoint operation for installing the object sampler |
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65 StartOperation op(sample_count); |
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66 VMThread::execute(&op); |
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67 |
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68 if (!is_running()) { |
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69 log_trace(jfr, system)("Object sampling could not be started because the sampler could not be allocated"); |
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70 return false; |
58 } |
71 } |
59 // Allows user to disable leak profiler on command line by setting queue size to zero. |
72 assert(is_running(), "invariant"); |
60 if (sample_count > 0) { |
73 log_trace(jfr, system)("Object sampling started"); |
61 StartOperation op(sample_count); |
74 return true; |
62 VMThread::execute(&op); |
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63 return _object_sampler != NULL; |
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64 } |
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65 return false; |
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66 } |
75 } |
67 |
76 |
68 bool LeakProfiler::stop() { |
77 bool LeakProfiler::stop() { |
69 if (_object_sampler == NULL) { |
78 if (!is_running()) { |
70 // already stopped/not started |
79 return false; |
71 return true; |
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72 } |
80 } |
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81 |
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82 // schedule the safepoint operation for uninstalling and destroying the object sampler |
73 StopOperation op; |
83 StopOperation op; |
74 VMThread::execute(&op); |
84 VMThread::execute(&op); |
75 return _object_sampler == NULL; |
85 |
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86 assert(!is_running(), "invariant"); |
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87 log_trace(jfr, system)("Object sampling stopped"); |
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88 return true; |
76 } |
89 } |
77 |
90 |
78 void LeakProfiler::emit_events(jlong cutoff_ticks, bool emit_all) { |
91 void LeakProfiler::emit_events(int64_t cutoff_ticks, bool emit_all) { |
79 if (!is_running()) { |
92 if (!is_running()) { |
80 return; |
93 return; |
81 } |
94 } |
82 EmitEventOperation op(cutoff_ticks, emit_all); |
95 // exclusive access to object sampler instance |
83 VMThread::execute(&op); |
96 ObjectSampler* const sampler = ObjectSampler::acquire(); |
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97 assert(sampler != NULL, "invariant"); |
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98 EventEmitter::emit(sampler, cutoff_ticks, emit_all); |
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99 ObjectSampler::release(); |
84 } |
100 } |
85 |
101 |
86 void LeakProfiler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
102 void LeakProfiler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
87 assert(SafepointSynchronize::is_at_safepoint(), |
103 assert(SafepointSynchronize::is_at_safepoint(), |
88 "Leak Profiler::oops_do(...) may only be called during safepoint"); |
104 "Leak Profiler::oops_do(...) may only be called during safepoint"); |
89 |
105 if (is_running()) { |
90 if (_object_sampler != NULL) { |
106 ObjectSampler::oops_do(is_alive, f); |
91 _object_sampler->oops_do(is_alive, f); |
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92 } |
107 } |
93 } |
108 } |
94 |
109 |
95 void LeakProfiler::sample(HeapWord* object, |
110 void LeakProfiler::sample(HeapWord* object, size_t size, JavaThread* thread) { |
96 size_t size, |
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97 JavaThread* thread) { |
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98 assert(is_running(), "invariant"); |
111 assert(is_running(), "invariant"); |
99 assert(thread != NULL, "invariant"); |
112 assert(thread != NULL, "invariant"); |
100 assert(thread->thread_state() == _thread_in_vm, "invariant"); |
113 assert(thread->thread_state() == _thread_in_vm, "invariant"); |
101 |
114 |
102 // exclude compiler threads and code sweeper thread |
115 // exclude compiler threads and code sweeper thread |
103 if (thread->is_hidden_from_external_view()) { |
116 if (thread->is_hidden_from_external_view()) { |
104 return; |
117 return; |
105 } |
118 } |
106 |
119 |
107 _object_sampler->add(object, size, thread); |
120 ObjectSampler::sample(object, size, thread); |
108 } |
121 } |
109 |
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110 ObjectSampler* LeakProfiler::object_sampler() { |
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111 assert(is_suspended() || SafepointSynchronize::is_at_safepoint(), |
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112 "Leak Profiler::object_sampler() may only be called during safepoint"); |
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113 return _object_sampler; |
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114 } |
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115 |
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116 void LeakProfiler::set_object_sampler(ObjectSampler* object_sampler) { |
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117 assert(SafepointSynchronize::is_at_safepoint(), |
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118 "Leak Profiler::set_object_sampler() may only be called during safepoint"); |
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119 _object_sampler = object_sampler; |
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120 } |
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121 |
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122 bool LeakProfiler::is_running() { |
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123 return _object_sampler != NULL && !suspended; |
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124 } |
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125 |
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126 bool LeakProfiler::is_suspended() { |
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127 return _object_sampler != NULL && suspended; |
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128 } |
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129 |
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130 void LeakProfiler::resume() { |
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131 assert(is_suspended(), "invariant"); |
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132 OrderAccess::storestore(); |
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133 Atomic::store((jbyte)0, &suspended); |
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134 assert(is_running(), "invariant"); |
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135 } |
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136 |
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137 void LeakProfiler::suspend() { |
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138 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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139 assert(_object_sampler != NULL, "invariant"); |
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140 assert(!is_suspended(), "invariant"); |
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141 suspended = (jbyte)1; // safepoint visible |
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142 } |
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