author | stuefe |
Fri, 19 Oct 2018 09:39:29 +0200 | |
changeset 52302 | 912b79d983d9 |
parent 51548 | 35a6956f4243 |
child 52448 | bc5c7f63dbae |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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26 |
#include "jfr/jfrEvents.hpp" |
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#include "jfr/recorder/jfrRecorder.hpp" |
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#include "jfr/periodic/sampling/jfrCallTrace.hpp" |
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#include "jfr/periodic/sampling/jfrThreadSampler.hpp" |
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#include "jfr/recorder/service/jfrOptionSet.hpp" |
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#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp" |
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#include "jfr/support/jfrThreadId.hpp" |
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#include "jfr/utilities/jfrTime.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/frame.inline.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/semaphore.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "runtime/threadSMR.hpp" |
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40 |
||
41 |
enum JfrSampleType { |
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42 |
NO_SAMPLE = 0, |
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JAVA_SAMPLE = 1, |
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44 |
NATIVE_SAMPLE = 2 |
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45 |
}; |
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static bool thread_state_in_java(JavaThread* thread) { |
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assert(thread != NULL, "invariant"); |
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switch(thread->thread_state()) { |
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case _thread_new: |
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case _thread_uninitialized: |
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case _thread_new_trans: |
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case _thread_in_vm_trans: |
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case _thread_blocked_trans: |
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case _thread_in_native_trans: |
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case _thread_blocked: |
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case _thread_in_vm: |
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case _thread_in_native: |
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case _thread_in_Java_trans: |
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break; |
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case _thread_in_Java: |
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return true; |
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default: |
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ShouldNotReachHere(); |
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break; |
50113 | 66 |
} |
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return false; |
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} |
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||
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static bool thread_state_in_native(JavaThread* thread) { |
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assert(thread != NULL, "invariant"); |
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switch(thread->thread_state()) { |
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case _thread_new: |
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case _thread_uninitialized: |
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case _thread_new_trans: |
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case _thread_blocked_trans: |
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case _thread_blocked: |
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case _thread_in_vm: |
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case _thread_in_vm_trans: |
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case _thread_in_Java_trans: |
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case _thread_in_Java: |
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case _thread_in_native_trans: |
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break; |
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case _thread_in_native: |
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return true; |
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default: |
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ShouldNotReachHere(); |
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break; |
50113 | 89 |
} |
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return false; |
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} |
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class JfrThreadSampleClosure { |
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public: |
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JfrThreadSampleClosure(EventExecutionSample* events, EventNativeMethodSample* events_native); |
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~JfrThreadSampleClosure() {} |
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EventExecutionSample* next_event() { return &_events[_added_java++]; } |
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EventNativeMethodSample* next_event_native() { return &_events_native[_added_native++]; } |
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void commit_events(JfrSampleType type); |
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bool do_sample_thread(JavaThread* thread, JfrStackFrame* frames, u4 max_frames, JfrSampleType type); |
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uint java_entries() { return _added_java; } |
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uint native_entries() { return _added_native; } |
50113 | 103 |
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private: |
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bool sample_thread_in_java(JavaThread* thread, JfrStackFrame* frames, u4 max_frames); |
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bool sample_thread_in_native(JavaThread* thread, JfrStackFrame* frames, u4 max_frames); |
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EventExecutionSample* _events; |
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EventNativeMethodSample* _events_native; |
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Thread* _self; |
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uint _added_java; |
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uint _added_native; |
50113 | 112 |
}; |
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114 |
class OSThreadSampler : public os::SuspendedThreadTask { |
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public: |
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OSThreadSampler(JavaThread* thread, |
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JfrThreadSampleClosure& closure, |
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JfrStackFrame *frames, |
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u4 max_frames) : os::SuspendedThreadTask((Thread*)thread), |
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_success(false), |
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_stacktrace(frames, max_frames), |
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_closure(closure), |
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_suspend_time() {} |
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125 |
void take_sample(); |
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void do_task(const os::SuspendedThreadTaskContext& context); |
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void protected_task(const os::SuspendedThreadTaskContext& context); |
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bool success() const { return _success; } |
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const JfrStackTrace& stacktrace() const { return _stacktrace; } |
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131 |
private: |
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132 |
bool _success; |
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133 |
JfrStackTrace _stacktrace; |
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JfrThreadSampleClosure& _closure; |
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135 |
JfrTicks _suspend_time; |
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136 |
}; |
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137 |
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138 |
class OSThreadSamplerCallback : public os::CrashProtectionCallback { |
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139 |
public: |
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140 |
OSThreadSamplerCallback(OSThreadSampler& sampler, const os::SuspendedThreadTaskContext &context) : |
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141 |
_sampler(sampler), _context(context) { |
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142 |
} |
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143 |
virtual void call() { |
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144 |
_sampler.protected_task(_context); |
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145 |
} |
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146 |
private: |
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147 |
OSThreadSampler& _sampler; |
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148 |
const os::SuspendedThreadTaskContext& _context; |
|
149 |
}; |
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150 |
||
151 |
void OSThreadSampler::do_task(const os::SuspendedThreadTaskContext& context) { |
|
152 |
#ifndef ASSERT |
|
153 |
guarantee(JfrOptionSet::sample_protection(), "Sample Protection should be on in product builds"); |
|
154 |
#endif |
|
155 |
assert(_suspend_time.value() == 0, "already timestamped!"); |
|
156 |
_suspend_time = JfrTicks::now(); |
|
157 |
||
158 |
if (JfrOptionSet::sample_protection()) { |
|
159 |
OSThreadSamplerCallback cb(*this, context); |
|
160 |
os::ThreadCrashProtection crash_protection; |
|
161 |
if (!crash_protection.call(cb)) { |
|
162 |
log_error(jfr)("Thread method sampler crashed"); |
|
163 |
} |
|
164 |
} else { |
|
165 |
protected_task(context); |
|
166 |
} |
|
167 |
} |
|
168 |
||
169 |
/* |
|
170 |
* From this method and down the call tree we attempt to protect against crashes |
|
171 |
* using a signal handler / __try block. Don't take locks, rely on destructors or |
|
172 |
* leave memory (in case of signal / exception) in an inconsistent state. */ |
|
173 |
void OSThreadSampler::protected_task(const os::SuspendedThreadTaskContext& context) { |
|
174 |
JavaThread* jth = (JavaThread*)context.thread(); |
|
175 |
// Skip sample if we signaled a thread that moved to other state |
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if (!thread_state_in_java(jth)) { |
50113 | 177 |
return; |
178 |
} |
|
179 |
JfrGetCallTrace trace(true, jth); |
|
180 |
frame topframe; |
|
181 |
if (trace.get_topframe(context.ucontext(), topframe)) { |
|
182 |
if (_stacktrace.record_thread(*jth, topframe)) { |
|
183 |
/* If we managed to get a topframe and a stacktrace, create an event |
|
184 |
* and put it into our array. We can't call Jfr::_stacktraces.add() |
|
185 |
* here since it would allocate memory using malloc. Doing so while |
|
186 |
* the stopped thread is inside malloc would deadlock. */ |
|
187 |
_success = true; |
|
188 |
EventExecutionSample *ev = _closure.next_event(); |
|
189 |
ev->set_starttime(_suspend_time); |
|
190 |
ev->set_endtime(_suspend_time); // fake to not take an end time |
|
191 |
ev->set_sampledThread(JFR_THREAD_ID(jth)); |
|
192 |
ev->set_state(java_lang_Thread::get_thread_status(jth->threadObj())); |
|
193 |
} |
|
194 |
} |
|
195 |
} |
|
196 |
||
197 |
void OSThreadSampler::take_sample() { |
|
198 |
run(); |
|
199 |
} |
|
200 |
||
201 |
class JfrNativeSamplerCallback : public os::CrashProtectionCallback { |
|
202 |
public: |
|
203 |
JfrNativeSamplerCallback(JfrThreadSampleClosure& closure, JavaThread* jt, JfrStackFrame* frames, u4 max_frames) : |
|
204 |
_closure(closure), _jt(jt), _stacktrace(frames, max_frames), _success(false) { |
|
205 |
} |
|
206 |
virtual void call(); |
|
207 |
bool success() { return _success; } |
|
208 |
JfrStackTrace& stacktrace() { return _stacktrace; } |
|
209 |
||
210 |
private: |
|
211 |
JfrThreadSampleClosure& _closure; |
|
212 |
JavaThread* _jt; |
|
213 |
JfrStackTrace _stacktrace; |
|
214 |
bool _success; |
|
215 |
}; |
|
216 |
||
217 |
static void write_native_event(JfrThreadSampleClosure& closure, JavaThread* jt) { |
|
218 |
EventNativeMethodSample *ev = closure.next_event_native(); |
|
219 |
ev->set_starttime(JfrTicks::now()); |
|
220 |
ev->set_sampledThread(JFR_THREAD_ID(jt)); |
|
221 |
ev->set_state(java_lang_Thread::get_thread_status(jt->threadObj())); |
|
222 |
} |
|
223 |
||
224 |
void JfrNativeSamplerCallback::call() { |
|
225 |
// When a thread is only attach it will be native without a last java frame |
|
226 |
if (!_jt->has_last_Java_frame()) { |
|
227 |
return; |
|
228 |
} |
|
229 |
||
230 |
frame topframe = _jt->last_frame(); |
|
231 |
frame first_java_frame; |
|
232 |
Method* method = NULL; |
|
233 |
JfrGetCallTrace gct(false, _jt); |
|
234 |
if (!gct.find_top_frame(topframe, &method, first_java_frame)) { |
|
235 |
return; |
|
236 |
} |
|
237 |
if (method == NULL) { |
|
238 |
return; |
|
239 |
} |
|
240 |
topframe = first_java_frame; |
|
241 |
_success = _stacktrace.record_thread(*_jt, topframe); |
|
242 |
if (_success) { |
|
243 |
write_native_event(_closure, _jt); |
|
244 |
} |
|
245 |
} |
|
246 |
||
247 |
bool JfrThreadSampleClosure::sample_thread_in_java(JavaThread* thread, JfrStackFrame* frames, u4 max_frames) { |
|
248 |
OSThreadSampler sampler(thread, *this, frames, max_frames); |
|
249 |
sampler.take_sample(); |
|
250 |
/* We don't want to allocate any memory using malloc/etc while the thread |
|
251 |
* is stopped, so everything is stored in stack allocated memory until this |
|
252 |
* point where the thread has been resumed again, if the sampling was a success |
|
253 |
* we need to store the stacktrace in the stacktrace repository and update |
|
254 |
* the event with the id that was returned. */ |
|
255 |
if (!sampler.success()) { |
|
256 |
return false; |
|
257 |
} |
|
258 |
EventExecutionSample *event = &_events[_added_java - 1]; |
|
259 |
traceid id = JfrStackTraceRepository::add(sampler.stacktrace()); |
|
260 |
assert(id != 0, "Stacktrace id should not be 0"); |
|
261 |
event->set_stackTrace(id); |
|
262 |
return true; |
|
263 |
} |
|
264 |
||
265 |
bool JfrThreadSampleClosure::sample_thread_in_native(JavaThread* thread, JfrStackFrame* frames, u4 max_frames) { |
|
266 |
JfrNativeSamplerCallback cb(*this, thread, frames, max_frames); |
|
267 |
if (JfrOptionSet::sample_protection()) { |
|
268 |
os::ThreadCrashProtection crash_protection; |
|
269 |
if (!crash_protection.call(cb)) { |
|
270 |
log_error(jfr)("Thread method sampler crashed for native"); |
|
271 |
} |
|
272 |
} else { |
|
273 |
cb.call(); |
|
274 |
} |
|
275 |
if (!cb.success()) { |
|
276 |
return false; |
|
277 |
} |
|
278 |
EventNativeMethodSample *event = &_events_native[_added_native - 1]; |
|
279 |
traceid id = JfrStackTraceRepository::add(cb.stacktrace()); |
|
280 |
assert(id != 0, "Stacktrace id should not be 0"); |
|
281 |
event->set_stackTrace(id); |
|
282 |
return true; |
|
283 |
} |
|
284 |
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static const uint MAX_NR_OF_JAVA_SAMPLES = 5; |
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static const uint MAX_NR_OF_NATIVE_SAMPLES = 1; |
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|
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void JfrThreadSampleClosure::commit_events(JfrSampleType type) { |
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289 |
if (JAVA_SAMPLE == type) { |
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assert(_added_java <= MAX_NR_OF_JAVA_SAMPLES, "invariant"); |
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for (uint i = 0; i < _added_java; ++i) { |
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_events[i].commit(); |
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} |
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} else { |
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assert(NATIVE_SAMPLE == type, "invariant"); |
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assert(_added_native <= MAX_NR_OF_NATIVE_SAMPLES, "invariant"); |
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for (uint i = 0; i < _added_native; ++i) { |
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_events_native[i].commit(); |
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299 |
} |
50113 | 300 |
} |
301 |
} |
|
302 |
||
303 |
JfrThreadSampleClosure::JfrThreadSampleClosure(EventExecutionSample* events, EventNativeMethodSample* events_native) : |
|
304 |
_events(events), |
|
305 |
_events_native(events_native), |
|
306 |
_self(Thread::current()), |
|
307 |
_added_java(0), |
|
308 |
_added_native(0) { |
|
309 |
} |
|
310 |
||
51548 | 311 |
class JfrThreadSampler : public NonJavaThread { |
50113 | 312 |
friend class JfrThreadSampling; |
313 |
private: |
|
314 |
Semaphore _sample; |
|
315 |
Thread* _sampler_thread; |
|
316 |
JfrStackFrame* const _frames; |
|
317 |
JavaThread* _last_thread_java; |
|
318 |
JavaThread* _last_thread_native; |
|
319 |
size_t _interval_java; |
|
320 |
size_t _interval_native; |
|
321 |
int _cur_index; |
|
322 |
const u4 _max_frames; |
|
323 |
volatile bool _disenrolled; |
|
324 |
static Monitor* _transition_block_lock; |
|
325 |
||
326 |
JavaThread* next_thread(ThreadsList* t_list, JavaThread* first_sampled, JavaThread* current); |
|
327 |
void task_stacktrace(JfrSampleType type, JavaThread** last_thread); |
|
328 |
JfrThreadSampler(size_t interval_java, size_t interval_native, u4 max_frames); |
|
329 |
~JfrThreadSampler(); |
|
330 |
||
331 |
void start_thread(); |
|
332 |
||
333 |
void enroll(); |
|
334 |
void disenroll(); |
|
335 |
void set_java_interval(size_t interval) { _interval_java = interval; }; |
|
336 |
void set_native_interval(size_t interval) { _interval_native = interval; }; |
|
337 |
size_t get_java_interval() { return _interval_java; }; |
|
338 |
size_t get_native_interval() { return _interval_native; }; |
|
339 |
||
340 |
public: |
|
341 |
void run(); |
|
342 |
static Monitor* transition_block() { return _transition_block_lock; } |
|
343 |
static void on_javathread_suspend(JavaThread* thread); |
|
344 |
}; |
|
345 |
||
346 |
Monitor* JfrThreadSampler::_transition_block_lock = new Monitor(Mutex::leaf, "Trace block", true, Monitor::_safepoint_check_never); |
|
347 |
||
348 |
static void clear_transition_block(JavaThread* jt) { |
|
349 |
jt->clear_trace_flag(); |
|
350 |
JfrThreadLocal* const tl = jt->jfr_thread_local(); |
|
351 |
if (tl->is_trace_block()) { |
|
352 |
MutexLockerEx ml(JfrThreadSampler::transition_block(), Mutex::_no_safepoint_check_flag); |
|
353 |
JfrThreadSampler::transition_block()->notify_all(); |
|
354 |
} |
|
355 |
} |
|
356 |
||
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bool JfrThreadSampleClosure::do_sample_thread(JavaThread* thread, JfrStackFrame* frames, u4 max_frames, JfrSampleType type) { |
50113 | 358 |
assert(Threads_lock->owned_by_self(), "Holding the thread table lock."); |
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359 |
if (thread->is_hidden_from_external_view() || thread->in_deopt_handler()) { |
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360 |
return false; |
50113 | 361 |
} |
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362 |
|
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363 |
bool ret = false; |
50113 | 364 |
thread->set_trace_flag(); |
365 |
if (!UseMembar) { |
|
366 |
os::serialize_thread_states(); |
|
367 |
} |
|
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368 |
if (JAVA_SAMPLE == type) { |
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369 |
if (thread_state_in_java(thread)) { |
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370 |
ret = sample_thread_in_java(thread, frames, max_frames); |
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371 |
} |
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372 |
} else { |
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373 |
assert(NATIVE_SAMPLE == type, "invariant"); |
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374 |
if (thread_state_in_native(thread)) { |
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375 |
ret = sample_thread_in_native(thread, frames, max_frames); |
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376 |
} |
50113 | 377 |
} |
378 |
clear_transition_block(thread); |
|
379 |
return ret; |
|
380 |
} |
|
381 |
||
382 |
JfrThreadSampler::JfrThreadSampler(size_t interval_java, size_t interval_native, u4 max_frames) : |
|
383 |
_sample(), |
|
384 |
_sampler_thread(NULL), |
|
385 |
_frames(JfrCHeapObj::new_array<JfrStackFrame>(max_frames)), |
|
386 |
_last_thread_java(NULL), |
|
387 |
_last_thread_native(NULL), |
|
388 |
_interval_java(interval_java), |
|
389 |
_interval_native(interval_native), |
|
390 |
_cur_index(-1), |
|
391 |
_max_frames(max_frames), |
|
392 |
_disenrolled(true) { |
|
393 |
} |
|
394 |
||
395 |
JfrThreadSampler::~JfrThreadSampler() { |
|
396 |
JfrCHeapObj::free(_frames, sizeof(JfrStackFrame) * _max_frames); |
|
397 |
} |
|
398 |
||
399 |
void JfrThreadSampler::on_javathread_suspend(JavaThread* thread) { |
|
400 |
JfrThreadLocal* const tl = thread->jfr_thread_local(); |
|
401 |
tl->set_trace_block(); |
|
402 |
{ |
|
403 |
MutexLockerEx ml(transition_block(), Mutex::_no_safepoint_check_flag); |
|
404 |
while (thread->is_trace_suspend()) { |
|
405 |
transition_block()->wait(true); |
|
406 |
} |
|
407 |
tl->clear_trace_block(); |
|
408 |
} |
|
409 |
} |
|
410 |
||
411 |
JavaThread* JfrThreadSampler::next_thread(ThreadsList* t_list, JavaThread* first_sampled, JavaThread* current) { |
|
50373
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412 |
assert(t_list != NULL, "invariant"); |
50113 | 413 |
assert(Threads_lock->owned_by_self(), "Holding the thread table lock."); |
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414 |
assert(_cur_index >= -1 && (uint)_cur_index + 1 <= t_list->length(), "invariant"); |
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|
415 |
assert((current == NULL && -1 == _cur_index) || (t_list->find_index_of_JavaThread(current) == _cur_index), "invariant"); |
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|
416 |
if ((uint)_cur_index + 1 == t_list->length()) { |
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|
417 |
// wrap |
50113 | 418 |
_cur_index = 0; |
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419 |
} else { |
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420 |
_cur_index++; |
50113 | 421 |
} |
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422 |
assert(_cur_index >= 0 && (uint)_cur_index < t_list->length(), "invariant"); |
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|
423 |
JavaThread* const next = t_list->thread_at(_cur_index); |
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|
424 |
return next != first_sampled ? next : NULL; |
50113 | 425 |
} |
426 |
||
427 |
void JfrThreadSampler::start_thread() { |
|
428 |
if (os::create_thread(this, os::os_thread)) { |
|
429 |
os::start_thread(this); |
|
430 |
} else { |
|
431 |
log_error(jfr)("Failed to create thread for thread sampling"); |
|
432 |
} |
|
433 |
} |
|
434 |
||
435 |
void JfrThreadSampler::enroll() { |
|
436 |
if (_disenrolled) { |
|
437 |
log_info(jfr)("Enrolling thread sampler"); |
|
438 |
_sample.signal(); |
|
439 |
_disenrolled = false; |
|
440 |
} |
|
441 |
} |
|
442 |
||
443 |
void JfrThreadSampler::disenroll() { |
|
444 |
if (!_disenrolled) { |
|
445 |
_sample.wait(); |
|
446 |
_disenrolled = true; |
|
447 |
log_info(jfr)("Disenrolling thread sampler"); |
|
448 |
} |
|
449 |
} |
|
450 |
||
451 |
static jlong get_monotonic_ms() { |
|
452 |
return os::javaTimeNanos() / 1000000; |
|
453 |
} |
|
454 |
||
455 |
void JfrThreadSampler::run() { |
|
456 |
assert(_sampler_thread == NULL, "invariant"); |
|
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|
457 |
|
50113 | 458 |
_sampler_thread = this; |
459 |
||
460 |
jlong last_java_ms = get_monotonic_ms(); |
|
461 |
jlong last_native_ms = last_java_ms; |
|
462 |
while (true) { |
|
463 |
if (!_sample.trywait()) { |
|
464 |
// disenrolled |
|
465 |
_sample.wait(); |
|
466 |
last_java_ms = get_monotonic_ms(); |
|
467 |
last_native_ms = last_java_ms; |
|
468 |
} |
|
469 |
_sample.signal(); |
|
470 |
jlong java_interval = _interval_java == 0 ? max_jlong : MAX2<jlong>(_interval_java, 10); |
|
471 |
jlong native_interval = _interval_native == 0 ? max_jlong : MAX2<jlong>(_interval_native, 10); |
|
472 |
||
473 |
jlong now_ms = get_monotonic_ms(); |
|
474 |
||
475 |
jlong next_j = java_interval + last_java_ms - now_ms; |
|
476 |
jlong next_n = native_interval + last_native_ms - now_ms; |
|
477 |
||
478 |
jlong sleep_to_next = MIN2<jlong>(next_j, next_n); |
|
479 |
||
480 |
if (sleep_to_next > 0) { |
|
481 |
os::naked_short_sleep(sleep_to_next); |
|
482 |
} |
|
483 |
||
484 |
if ((next_j - sleep_to_next) <= 0) { |
|
485 |
task_stacktrace(JAVA_SAMPLE, &_last_thread_java); |
|
486 |
last_java_ms = get_monotonic_ms(); |
|
487 |
} |
|
488 |
if ((next_n - sleep_to_next) <= 0) { |
|
489 |
task_stacktrace(NATIVE_SAMPLE, &_last_thread_native); |
|
490 |
last_native_ms = get_monotonic_ms(); |
|
491 |
} |
|
492 |
} |
|
493 |
delete this; |
|
494 |
} |
|
495 |
||
496 |
||
497 |
void JfrThreadSampler::task_stacktrace(JfrSampleType type, JavaThread** last_thread) { |
|
498 |
ResourceMark rm; |
|
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|
499 |
EventExecutionSample samples[MAX_NR_OF_JAVA_SAMPLES]; |
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|
500 |
EventNativeMethodSample samples_native[MAX_NR_OF_NATIVE_SAMPLES]; |
50113 | 501 |
JfrThreadSampleClosure sample_task(samples, samples_native); |
502 |
||
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|
503 |
const uint sample_limit = JAVA_SAMPLE == type ? MAX_NR_OF_JAVA_SAMPLES : MAX_NR_OF_NATIVE_SAMPLES; |
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|
504 |
uint num_sample_attempts = 0; |
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|
505 |
JavaThread* start = NULL; |
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|
506 |
|
50113 | 507 |
{ |
508 |
elapsedTimer sample_time; |
|
509 |
sample_time.start(); |
|
510 |
{ |
|
511 |
MonitorLockerEx tlock(Threads_lock, Mutex::_allow_vm_block_flag); |
|
512 |
ThreadsListHandle tlh; |
|
50373
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|
513 |
// Resolve a sample session relative start position index into the thread list array. |
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514 |
// In cases where the last sampled thread is NULL or not-NULL but stale, find_index() returns -1. |
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515 |
_cur_index = tlh.list()->find_index_of_JavaThread(*last_thread); |
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|
516 |
JavaThread* current = _cur_index != -1 ? *last_thread : NULL; |
50113 | 517 |
|
50373
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|
518 |
while (num_sample_attempts < sample_limit) { |
50113 | 519 |
current = next_thread(tlh.list(), start, current); |
520 |
if (current == NULL) { |
|
521 |
break; |
|
522 |
} |
|
523 |
if (start == NULL) { |
|
50373
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|
524 |
start = current; // remember the thread where we started to attempt sampling |
50113 | 525 |
} |
526 |
if (current->is_Compiler_thread()) { |
|
527 |
continue; |
|
528 |
} |
|
50373
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|
529 |
sample_task.do_sample_thread(current, _frames, _max_frames, type); |
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|
530 |
num_sample_attempts++; |
50113 | 531 |
} |
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|
532 |
*last_thread = current; // remember the thread we last attempted to sample |
50113 | 533 |
} |
534 |
sample_time.stop(); |
|
535 |
log_trace(jfr)("JFR thread sampling done in %3.7f secs with %d java %d native samples", |
|
50373
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|
536 |
sample_time.seconds(), sample_task.java_entries(), sample_task.native_entries()); |
50113 | 537 |
} |
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|
538 |
if (num_sample_attempts > 0) { |
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|
539 |
sample_task.commit_events(type); |
50113 | 540 |
} |
541 |
} |
|
542 |
||
543 |
static JfrThreadSampling* _instance = NULL; |
|
544 |
||
545 |
JfrThreadSampling& JfrThreadSampling::instance() { |
|
546 |
return *_instance; |
|
547 |
} |
|
548 |
||
549 |
JfrThreadSampling* JfrThreadSampling::create() { |
|
550 |
assert(_instance == NULL, "invariant"); |
|
551 |
_instance = new JfrThreadSampling(); |
|
552 |
return _instance; |
|
553 |
} |
|
554 |
||
555 |
void JfrThreadSampling::destroy() { |
|
556 |
if (_instance != NULL) { |
|
557 |
delete _instance; |
|
558 |
_instance = NULL; |
|
559 |
} |
|
560 |
} |
|
561 |
||
562 |
JfrThreadSampling::JfrThreadSampling() : _sampler(NULL) {} |
|
563 |
||
564 |
JfrThreadSampling::~JfrThreadSampling() { |
|
565 |
if (_sampler != NULL) { |
|
566 |
_sampler->disenroll(); |
|
567 |
} |
|
568 |
} |
|
569 |
||
570 |
static void log(size_t interval_java, size_t interval_native) { |
|
50373
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|
571 |
log_info(jfr)("Updated thread sampler for java: " SIZE_FORMAT " ms, native " SIZE_FORMAT " ms", interval_java, interval_native); |
50113 | 572 |
} |
573 |
||
574 |
void JfrThreadSampling::start_sampler(size_t interval_java, size_t interval_native) { |
|
575 |
assert(_sampler == NULL, "invariant"); |
|
576 |
log_info(jfr)("Enrolling thread sampler"); |
|
577 |
_sampler = new JfrThreadSampler(interval_java, interval_native, JfrOptionSet::stackdepth()); |
|
578 |
_sampler->start_thread(); |
|
579 |
_sampler->enroll(); |
|
580 |
} |
|
581 |
||
582 |
void JfrThreadSampling::set_sampling_interval(bool java_interval, size_t period) { |
|
583 |
size_t interval_java = 0; |
|
584 |
size_t interval_native = 0; |
|
585 |
if (_sampler != NULL) { |
|
586 |
interval_java = _sampler->get_java_interval(); |
|
587 |
interval_native = _sampler->get_native_interval(); |
|
588 |
} |
|
589 |
if (java_interval) { |
|
590 |
interval_java = period; |
|
591 |
} else { |
|
592 |
interval_native = period; |
|
593 |
} |
|
594 |
if (interval_java > 0 || interval_native > 0) { |
|
595 |
if (_sampler == NULL) { |
|
596 |
log_info(jfr)("Creating thread sampler for java:%zu ms, native %zu ms", interval_java, interval_native); |
|
597 |
start_sampler(interval_java, interval_native); |
|
598 |
} else { |
|
599 |
_sampler->set_java_interval(interval_java); |
|
600 |
_sampler->set_native_interval(interval_native); |
|
601 |
_sampler->enroll(); |
|
602 |
} |
|
603 |
assert(_sampler != NULL, "invariant"); |
|
604 |
log(interval_java, interval_native); |
|
605 |
} else if (_sampler != NULL) { |
|
606 |
_sampler->disenroll(); |
|
607 |
} |
|
608 |
} |
|
609 |
||
610 |
void JfrThreadSampling::set_java_sample_interval(size_t period) { |
|
611 |
if (_instance == NULL && 0 == period) { |
|
612 |
return; |
|
613 |
} |
|
614 |
instance().set_sampling_interval(true, period); |
|
615 |
} |
|
616 |
||
617 |
void JfrThreadSampling::set_native_sample_interval(size_t period) { |
|
618 |
if (_instance == NULL && 0 == period) { |
|
619 |
return; |
|
620 |
} |
|
621 |
instance().set_sampling_interval(false, period); |
|
622 |
} |
|
623 |
||
624 |
void JfrThreadSampling::on_javathread_suspend(JavaThread* thread) { |
|
625 |
JfrThreadSampler::on_javathread_suspend(thread); |
|
626 |
} |
|
627 |
||
628 |
Thread* JfrThreadSampling::sampler_thread() { |
|
629 |
if (_instance == NULL) { |
|
630 |
return NULL; |
|
631 |
} |
|
632 |
return _instance->_sampler != NULL ? _instance->_sampler->_sampler_thread : NULL; |
|
633 |
} |