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/*
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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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#include "precompiled.hpp"
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#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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enum JfrSampleType {
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NO_SAMPLE = 0,
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JAVA_SAMPLE = 1,
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NATIVE_SAMPLE = 2
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};
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static bool in_java_sample(JavaThread* thread) {
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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;
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}
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return false;
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}
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static bool in_native_sample(JavaThread* thread) {
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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;
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}
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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();
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int added() const { return _added_java; }
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JfrSampleType do_sample_thread(JavaThread* thread, JfrStackFrame* frames, u4 max_frames, bool java_sample, bool native_sample);
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int java_entries() { return _added_java; }
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int native_entries() { return _added_native; }
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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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int _added_java;
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int _added_native;
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};
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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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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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private:
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bool _success;
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JfrStackTrace _stacktrace;
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JfrThreadSampleClosure& _closure;
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JfrTicks _suspend_time;
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};
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class OSThreadSamplerCallback : public os::CrashProtectionCallback {
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public:
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OSThreadSamplerCallback(OSThreadSampler& sampler, const os::SuspendedThreadTaskContext &context) :
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_sampler(sampler), _context(context) {
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}
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virtual void call() {
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_sampler.protected_task(_context);
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}
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private:
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OSThreadSampler& _sampler;
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const os::SuspendedThreadTaskContext& _context;
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};
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void OSThreadSampler::do_task(const os::SuspendedThreadTaskContext& context) {
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#ifndef ASSERT
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guarantee(JfrOptionSet::sample_protection(), "Sample Protection should be on in product builds");
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#endif
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assert(_suspend_time.value() == 0, "already timestamped!");
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_suspend_time = JfrTicks::now();
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if (JfrOptionSet::sample_protection()) {
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OSThreadSamplerCallback cb(*this, context);
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os::ThreadCrashProtection crash_protection;
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if (!crash_protection.call(cb)) {
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log_error(jfr)("Thread method sampler crashed");
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}
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} else {
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protected_task(context);
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}
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}
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/*
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* From this method and down the call tree we attempt to protect against crashes
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* using a signal handler / __try block. Don't take locks, rely on destructors or
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* leave memory (in case of signal / exception) in an inconsistent state. */
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void OSThreadSampler::protected_task(const os::SuspendedThreadTaskContext& context) {
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JavaThread* jth = (JavaThread*)context.thread();
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// Skip sample if we signaled a thread that moved to other state
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if (!in_java_sample(jth)) {
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return;
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}
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JfrGetCallTrace trace(true, jth);
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frame topframe;
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if (trace.get_topframe(context.ucontext(), topframe)) {
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if (_stacktrace.record_thread(*jth, topframe)) {
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/* If we managed to get a topframe and a stacktrace, create an event
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* and put it into our array. We can't call Jfr::_stacktraces.add()
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* here since it would allocate memory using malloc. Doing so while
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* the stopped thread is inside malloc would deadlock. */
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_success = true;
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EventExecutionSample *ev = _closure.next_event();
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ev->set_starttime(_suspend_time);
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ev->set_endtime(_suspend_time); // fake to not take an end time
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ev->set_sampledThread(JFR_THREAD_ID(jth));
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ev->set_state(java_lang_Thread::get_thread_status(jth->threadObj()));
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}
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}
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}
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void OSThreadSampler::take_sample() {
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run();
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}
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class JfrNativeSamplerCallback : public os::CrashProtectionCallback {
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public:
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JfrNativeSamplerCallback(JfrThreadSampleClosure& closure, JavaThread* jt, JfrStackFrame* frames, u4 max_frames) :
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_closure(closure), _jt(jt), _stacktrace(frames, max_frames), _success(false) {
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}
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virtual void call();
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bool success() { return _success; }
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JfrStackTrace& stacktrace() { return _stacktrace; }
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private:
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JfrThreadSampleClosure& _closure;
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JavaThread* _jt;
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JfrStackTrace _stacktrace;
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bool _success;
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};
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static void write_native_event(JfrThreadSampleClosure& closure, JavaThread* jt) {
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EventNativeMethodSample *ev = closure.next_event_native();
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ev->set_starttime(JfrTicks::now());
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ev->set_sampledThread(JFR_THREAD_ID(jt));
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ev->set_state(java_lang_Thread::get_thread_status(jt->threadObj()));
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}
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void JfrNativeSamplerCallback::call() {
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// When a thread is only attach it will be native without a last java frame
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if (!_jt->has_last_Java_frame()) {
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return;
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}
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frame topframe = _jt->last_frame();
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frame first_java_frame;
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Method* method = NULL;
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JfrGetCallTrace gct(false, _jt);
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if (!gct.find_top_frame(topframe, &method, first_java_frame)) {
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return;
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}
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if (method == NULL) {
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return;
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}
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topframe = first_java_frame;
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_success = _stacktrace.record_thread(*_jt, topframe);
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if (_success) {
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write_native_event(_closure, _jt);
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}
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}
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bool JfrThreadSampleClosure::sample_thread_in_java(JavaThread* thread, JfrStackFrame* frames, u4 max_frames) {
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OSThreadSampler sampler(thread, *this, frames, max_frames);
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sampler.take_sample();
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/* We don't want to allocate any memory using malloc/etc while the thread
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* is stopped, so everything is stored in stack allocated memory until this
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* point where the thread has been resumed again, if the sampling was a success
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* we need to store the stacktrace in the stacktrace repository and update
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* the event with the id that was returned. */
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if (!sampler.success()) {
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return false;
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}
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EventExecutionSample *event = &_events[_added_java - 1];
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traceid id = JfrStackTraceRepository::add(sampler.stacktrace());
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assert(id != 0, "Stacktrace id should not be 0");
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event->set_stackTrace(id);
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return true;
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}
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bool JfrThreadSampleClosure::sample_thread_in_native(JavaThread* thread, JfrStackFrame* frames, u4 max_frames) {
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JfrNativeSamplerCallback cb(*this, thread, frames, max_frames);
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if (JfrOptionSet::sample_protection()) {
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os::ThreadCrashProtection crash_protection;
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if (!crash_protection.call(cb)) {
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log_error(jfr)("Thread method sampler crashed for native");
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}
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} else {
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cb.call();
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}
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if (!cb.success()) {
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return false;
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}
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EventNativeMethodSample *event = &_events_native[_added_native - 1];
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traceid id = JfrStackTraceRepository::add(cb.stacktrace());
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assert(id != 0, "Stacktrace id should not be 0");
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event->set_stackTrace(id);
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return true;
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}
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void JfrThreadSampleClosure::commit_events() {
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for (int i = 0; i < _added_java; ++i) {
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_events[i].commit();
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}
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for (int i = 0; i < _added_native; ++i) {
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_events_native[i].commit();
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}
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}
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JfrThreadSampleClosure::JfrThreadSampleClosure(EventExecutionSample* events, EventNativeMethodSample* events_native) :
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_events(events),
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_events_native(events_native),
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_self(Thread::current()),
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_added_java(0),
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_added_native(0) {
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}
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class JfrThreadSampler : public Thread {
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friend class JfrThreadSampling;
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private:
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Semaphore _sample;
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Thread* _sampler_thread;
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JfrStackFrame* const _frames;
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JavaThread* _last_thread_java;
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JavaThread* _last_thread_native;
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size_t _interval_java;
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size_t _interval_native;
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int _cur_index;
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const u4 _max_frames;
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volatile bool _disenrolled;
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static Monitor* _transition_block_lock;
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JavaThread* next_thread(ThreadsList* t_list, JavaThread* first_sampled, JavaThread* current);
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void task_stacktrace(JfrSampleType type, JavaThread** last_thread);
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JfrThreadSampler(size_t interval_java, size_t interval_native, u4 max_frames);
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~JfrThreadSampler();
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void start_thread();
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void enroll();
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void disenroll();
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void set_java_interval(size_t interval) { _interval_java = interval; };
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void set_native_interval(size_t interval) { _interval_native = interval; };
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size_t get_java_interval() { return _interval_java; };
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size_t get_native_interval() { return _interval_native; };
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public:
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void run();
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static Monitor* transition_block() { return _transition_block_lock; }
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static void on_javathread_suspend(JavaThread* thread);
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};
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Monitor* JfrThreadSampler::_transition_block_lock = new Monitor(Mutex::leaf, "Trace block", true, Monitor::_safepoint_check_never);
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static void clear_transition_block(JavaThread* jt) {
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jt->clear_trace_flag();
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JfrThreadLocal* const tl = jt->jfr_thread_local();
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if (tl->is_trace_block()) {
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MutexLockerEx ml(JfrThreadSampler::transition_block(), Mutex::_no_safepoint_check_flag);
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JfrThreadSampler::transition_block()->notify_all();
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}
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}
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JfrSampleType JfrThreadSampleClosure::do_sample_thread(JavaThread* thread, JfrStackFrame* frames, u4 max_frames, bool java_sample, bool native_sample) {
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assert(Threads_lock->owned_by_self(), "Holding the thread table lock.");
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if (thread->is_hidden_from_external_view()) {
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return NO_SAMPLE;
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}
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if (thread->in_deopt_handler()) {
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return NO_SAMPLE;
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}
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JfrSampleType ret = NO_SAMPLE;
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thread->set_trace_flag();
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if (!UseMembar) {
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os::serialize_thread_states();
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}
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if (in_java_sample(thread) && java_sample) {
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ret = sample_thread_in_java(thread, frames, max_frames) ? JAVA_SAMPLE : NO_SAMPLE;
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} else if (in_native_sample(thread) && native_sample) {
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ret = sample_thread_in_native(thread, frames, max_frames) ? NATIVE_SAMPLE : NO_SAMPLE;
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}
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clear_transition_block(thread);
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return ret;
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}
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JfrThreadSampler::JfrThreadSampler(size_t interval_java, size_t interval_native, u4 max_frames) :
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_sample(),
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_sampler_thread(NULL),
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_frames(JfrCHeapObj::new_array<JfrStackFrame>(max_frames)),
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_last_thread_java(NULL),
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_last_thread_native(NULL),
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_interval_java(interval_java),
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_interval_native(interval_native),
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_cur_index(-1),
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_max_frames(max_frames),
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_disenrolled(true) {
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}
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JfrThreadSampler::~JfrThreadSampler() {
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JfrCHeapObj::free(_frames, sizeof(JfrStackFrame) * _max_frames);
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}
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void JfrThreadSampler::on_javathread_suspend(JavaThread* thread) {
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JfrThreadLocal* const tl = thread->jfr_thread_local();
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|
388 |
tl->set_trace_block();
|
|
389 |
{
|
|
390 |
MutexLockerEx ml(transition_block(), Mutex::_no_safepoint_check_flag);
|
|
391 |
while (thread->is_trace_suspend()) {
|
|
392 |
transition_block()->wait(true);
|
|
393 |
}
|
|
394 |
tl->clear_trace_block();
|
|
395 |
}
|
|
396 |
}
|
|
397 |
|
|
398 |
JavaThread* JfrThreadSampler::next_thread(ThreadsList* t_list, JavaThread* first_sampled, JavaThread* current) {
|
|
399 |
assert(Threads_lock->owned_by_self(), "Holding the thread table lock.");
|
|
400 |
if (current == NULL) {
|
|
401 |
_cur_index = 0;
|
|
402 |
return t_list->thread_at(_cur_index);
|
|
403 |
}
|
|
404 |
|
|
405 |
if (_cur_index == -1 || t_list->thread_at(_cur_index) != current) {
|
|
406 |
// 'current' is not at '_cur_index' so find it:
|
|
407 |
_cur_index = t_list->find_index_of_JavaThread(current);
|
|
408 |
assert(_cur_index != -1, "current JavaThread should be findable.");
|
|
409 |
}
|
|
410 |
_cur_index++;
|
|
411 |
|
|
412 |
JavaThread* next = NULL;
|
|
413 |
// wrap
|
|
414 |
if ((uint)_cur_index >= t_list->length()) {
|
|
415 |
_cur_index = 0;
|
|
416 |
}
|
|
417 |
next = t_list->thread_at(_cur_index);
|
|
418 |
|
|
419 |
// sample wrap
|
|
420 |
if (next == first_sampled) {
|
|
421 |
return NULL;
|
|
422 |
}
|
|
423 |
return next;
|
|
424 |
}
|
|
425 |
|
|
426 |
void JfrThreadSampler::start_thread() {
|
|
427 |
if (os::create_thread(this, os::os_thread)) {
|
|
428 |
os::start_thread(this);
|
|
429 |
} else {
|
|
430 |
log_error(jfr)("Failed to create thread for thread sampling");
|
|
431 |
}
|
|
432 |
}
|
|
433 |
|
|
434 |
void JfrThreadSampler::enroll() {
|
|
435 |
if (_disenrolled) {
|
|
436 |
log_info(jfr)("Enrolling thread sampler");
|
|
437 |
_sample.signal();
|
|
438 |
_disenrolled = false;
|
|
439 |
}
|
|
440 |
}
|
|
441 |
|
|
442 |
void JfrThreadSampler::disenroll() {
|
|
443 |
if (!_disenrolled) {
|
|
444 |
_sample.wait();
|
|
445 |
_disenrolled = true;
|
|
446 |
log_info(jfr)("Disenrolling thread sampler");
|
|
447 |
}
|
|
448 |
}
|
|
449 |
|
|
450 |
static jlong get_monotonic_ms() {
|
|
451 |
return os::javaTimeNanos() / 1000000;
|
|
452 |
}
|
|
453 |
|
|
454 |
void JfrThreadSampler::run() {
|
|
455 |
assert(_sampler_thread == NULL, "invariant");
|
|
456 |
_sampler_thread = this;
|
|
457 |
|
|
458 |
jlong last_java_ms = get_monotonic_ms();
|
|
459 |
jlong last_native_ms = last_java_ms;
|
|
460 |
while (true) {
|
|
461 |
if (!_sample.trywait()) {
|
|
462 |
// disenrolled
|
|
463 |
_sample.wait();
|
|
464 |
last_java_ms = get_monotonic_ms();
|
|
465 |
last_native_ms = last_java_ms;
|
|
466 |
}
|
|
467 |
_sample.signal();
|
|
468 |
jlong java_interval = _interval_java == 0 ? max_jlong : MAX2<jlong>(_interval_java, 10);
|
|
469 |
jlong native_interval = _interval_native == 0 ? max_jlong : MAX2<jlong>(_interval_native, 10);
|
|
470 |
|
|
471 |
jlong now_ms = get_monotonic_ms();
|
|
472 |
|
|
473 |
jlong next_j = java_interval + last_java_ms - now_ms;
|
|
474 |
jlong next_n = native_interval + last_native_ms - now_ms;
|
|
475 |
|
|
476 |
jlong sleep_to_next = MIN2<jlong>(next_j, next_n);
|
|
477 |
|
|
478 |
if (sleep_to_next > 0) {
|
|
479 |
os::naked_short_sleep(sleep_to_next);
|
|
480 |
}
|
|
481 |
|
|
482 |
if ((next_j - sleep_to_next) <= 0) {
|
|
483 |
task_stacktrace(JAVA_SAMPLE, &_last_thread_java);
|
|
484 |
last_java_ms = get_monotonic_ms();
|
|
485 |
}
|
|
486 |
if ((next_n - sleep_to_next) <= 0) {
|
|
487 |
task_stacktrace(NATIVE_SAMPLE, &_last_thread_native);
|
|
488 |
last_native_ms = get_monotonic_ms();
|
|
489 |
}
|
|
490 |
}
|
|
491 |
delete this;
|
|
492 |
}
|
|
493 |
|
|
494 |
static const int MAX_NR_OF_SAMPLES = 5;
|
|
495 |
|
|
496 |
void JfrThreadSampler::task_stacktrace(JfrSampleType type, JavaThread** last_thread) {
|
|
497 |
ResourceMark rm;
|
|
498 |
EventExecutionSample samples[MAX_NR_OF_SAMPLES];
|
|
499 |
EventNativeMethodSample samples_native[MAX_NR_OF_SAMPLES];
|
|
500 |
JfrThreadSampleClosure sample_task(samples, samples_native);
|
|
501 |
|
|
502 |
int num_samples = 0;
|
|
503 |
{
|
|
504 |
elapsedTimer sample_time;
|
|
505 |
sample_time.start();
|
|
506 |
|
|
507 |
{
|
|
508 |
MonitorLockerEx tlock(Threads_lock, Mutex::_allow_vm_block_flag);
|
|
509 |
ThreadsListHandle tlh;
|
|
510 |
JavaThread* current = tlh.includes(*last_thread) ? *last_thread : NULL;
|
|
511 |
JavaThread* start = NULL;
|
|
512 |
|
|
513 |
while (num_samples < MAX_NR_OF_SAMPLES) {
|
|
514 |
current = next_thread(tlh.list(), start, current);
|
|
515 |
if (current == NULL) {
|
|
516 |
break;
|
|
517 |
}
|
|
518 |
if (start == NULL) {
|
|
519 |
start = current; // remember thread where we started sampling
|
|
520 |
}
|
|
521 |
if (current->is_Compiler_thread()) {
|
|
522 |
continue;
|
|
523 |
}
|
|
524 |
*last_thread = current; // remember thread we last sampled
|
|
525 |
JfrSampleType ret = sample_task.do_sample_thread(current, _frames, _max_frames, type == JAVA_SAMPLE, type == NATIVE_SAMPLE);
|
|
526 |
switch (type) {
|
|
527 |
case JAVA_SAMPLE:
|
|
528 |
case NATIVE_SAMPLE:
|
|
529 |
++num_samples;
|
|
530 |
break;
|
|
531 |
default:
|
|
532 |
break;
|
|
533 |
}
|
|
534 |
}
|
|
535 |
}
|
|
536 |
sample_time.stop();
|
|
537 |
log_trace(jfr)("JFR thread sampling done in %3.7f secs with %d java %d native samples",
|
|
538 |
sample_time.seconds(), sample_task.java_entries(), sample_task.native_entries());
|
|
539 |
}
|
|
540 |
if (num_samples > 0) {
|
|
541 |
sample_task.commit_events();
|
|
542 |
}
|
|
543 |
}
|
|
544 |
|
|
545 |
static JfrThreadSampling* _instance = NULL;
|
|
546 |
|
|
547 |
JfrThreadSampling& JfrThreadSampling::instance() {
|
|
548 |
return *_instance;
|
|
549 |
}
|
|
550 |
|
|
551 |
JfrThreadSampling* JfrThreadSampling::create() {
|
|
552 |
assert(_instance == NULL, "invariant");
|
|
553 |
_instance = new JfrThreadSampling();
|
|
554 |
return _instance;
|
|
555 |
}
|
|
556 |
|
|
557 |
void JfrThreadSampling::destroy() {
|
|
558 |
if (_instance != NULL) {
|
|
559 |
delete _instance;
|
|
560 |
_instance = NULL;
|
|
561 |
}
|
|
562 |
}
|
|
563 |
|
|
564 |
JfrThreadSampling::JfrThreadSampling() : _sampler(NULL) {}
|
|
565 |
|
|
566 |
JfrThreadSampling::~JfrThreadSampling() {
|
|
567 |
if (_sampler != NULL) {
|
|
568 |
_sampler->disenroll();
|
|
569 |
}
|
|
570 |
}
|
|
571 |
|
|
572 |
static void log(size_t interval_java, size_t interval_native) {
|
|
573 |
log_info(jfr)("Updated thread sampler for java: " SIZE_FORMAT" ms, native " SIZE_FORMAT " ms", interval_java, interval_native);
|
|
574 |
}
|
|
575 |
|
|
576 |
void JfrThreadSampling::start_sampler(size_t interval_java, size_t interval_native) {
|
|
577 |
assert(_sampler == NULL, "invariant");
|
|
578 |
log_info(jfr)("Enrolling thread sampler");
|
|
579 |
_sampler = new JfrThreadSampler(interval_java, interval_native, JfrOptionSet::stackdepth());
|
|
580 |
_sampler->start_thread();
|
|
581 |
_sampler->enroll();
|
|
582 |
}
|
|
583 |
|
|
584 |
void JfrThreadSampling::set_sampling_interval(bool java_interval, size_t period) {
|
|
585 |
size_t interval_java = 0;
|
|
586 |
size_t interval_native = 0;
|
|
587 |
if (_sampler != NULL) {
|
|
588 |
interval_java = _sampler->get_java_interval();
|
|
589 |
interval_native = _sampler->get_native_interval();
|
|
590 |
}
|
|
591 |
|
|
592 |
if (java_interval) {
|
|
593 |
interval_java = period;
|
|
594 |
} else {
|
|
595 |
interval_native = period;
|
|
596 |
}
|
|
597 |
|
|
598 |
if (interval_java > 0 || interval_native > 0) {
|
|
599 |
if (_sampler == NULL) {
|
|
600 |
log_info(jfr)("Creating thread sampler for java:%zu ms, native %zu ms", interval_java, interval_native);
|
|
601 |
start_sampler(interval_java, interval_native);
|
|
602 |
} else {
|
|
603 |
_sampler->set_java_interval(interval_java);
|
|
604 |
_sampler->set_native_interval(interval_native);
|
|
605 |
_sampler->enroll();
|
|
606 |
}
|
|
607 |
assert(_sampler != NULL, "invariant");
|
|
608 |
log(interval_java, interval_native);
|
|
609 |
} else if (_sampler != NULL) {
|
|
610 |
_sampler->disenroll();
|
|
611 |
}
|
|
612 |
}
|
|
613 |
|
|
614 |
void JfrThreadSampling::set_java_sample_interval(size_t period) {
|
|
615 |
if (_instance == NULL && 0 == period) {
|
|
616 |
return;
|
|
617 |
}
|
|
618 |
instance().set_sampling_interval(true, period);
|
|
619 |
}
|
|
620 |
|
|
621 |
void JfrThreadSampling::set_native_sample_interval(size_t period) {
|
|
622 |
if (_instance == NULL && 0 == period) {
|
|
623 |
return;
|
|
624 |
}
|
|
625 |
instance().set_sampling_interval(false, period);
|
|
626 |
}
|
|
627 |
|
|
628 |
void JfrThreadSampling::on_javathread_suspend(JavaThread* thread) {
|
|
629 |
JfrThreadSampler::on_javathread_suspend(thread);
|
|
630 |
}
|
|
631 |
|
|
632 |
Thread* JfrThreadSampling::sampler_thread() {
|
|
633 |
if (_instance == NULL) {
|
|
634 |
return NULL;
|
|
635 |
}
|
|
636 |
return _instance->_sampler != NULL ? _instance->_sampler->_sampler_thread : NULL;
|
|
637 |
}
|