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/*
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* Copyright (c) 2017, 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 "logging/log.hpp"
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#include "jfr/jfrEvents.hpp"
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#include "jfr/periodic/jfrThreadCPULoadEvent.hpp"
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#include "jfr/support/jfrThreadId.hpp"
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#include "jfr/support/jfrThreadLocal.hpp"
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#include "jfr/utilities/jfrTime.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "runtime/os.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/threadSMR.inline.hpp"
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jlong JfrThreadCPULoadEvent::get_wallclock_time() {
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return os::javaTimeNanos();
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}
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int JfrThreadCPULoadEvent::_last_active_processor_count = 0;
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int JfrThreadCPULoadEvent::get_processor_count() {
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int cur_processor_count = os::active_processor_count();
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int last_processor_count = _last_active_processor_count;
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_last_active_processor_count = cur_processor_count;
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// If the number of processors decreases, we don't know at what point during
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// the sample interval this happened, so use the largest number to try
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// to avoid percentages above 100%
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return MAX2(cur_processor_count, last_processor_count);
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}
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// Returns false if the thread has not been scheduled since the last call to updateEvent
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// (i.e. the delta for both system and user time is 0 milliseconds)
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bool JfrThreadCPULoadEvent::update_event(EventThreadCPULoad& event, JavaThread* thread, jlong cur_wallclock_time, int processor_count) {
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JfrThreadLocal* const tl = thread->jfr_thread_local();
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jlong cur_cpu_time = os::thread_cpu_time(thread, true);
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jlong prev_cpu_time = tl->get_cpu_time();
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jlong prev_wallclock_time = tl->get_wallclock_time();
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tl->set_wallclock_time(cur_wallclock_time);
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// Threshold of 1 ms
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if (cur_cpu_time - prev_cpu_time < 1 * NANOSECS_PER_MILLISEC) {
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return false;
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}
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jlong cur_user_time = os::thread_cpu_time(thread, false);
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jlong prev_user_time = tl->get_user_time();
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jlong cur_system_time = cur_cpu_time - cur_user_time;
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jlong prev_system_time = prev_cpu_time - prev_user_time;
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// The user and total cpu usage clocks can have different resolutions, which can
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// make us see decreasing system time. Ensure time doesn't go backwards.
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if (prev_system_time > cur_system_time) {
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cur_cpu_time += prev_system_time - cur_system_time;
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cur_system_time = prev_system_time;
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}
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jlong user_time = cur_user_time - prev_user_time;
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jlong system_time = cur_system_time - prev_system_time;
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jlong wallclock_time = cur_wallclock_time - prev_wallclock_time;
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jlong total_available_time = wallclock_time * processor_count;
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// Avoid reporting percentages above the theoretical max
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if (user_time + system_time > wallclock_time) {
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jlong excess = user_time + system_time - wallclock_time;
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if (user_time > excess) {
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user_time -= excess;
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cur_user_time -= excess;
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cur_cpu_time -= excess;
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} else {
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cur_cpu_time -= excess;
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excess -= user_time;
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user_time = 0;
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cur_user_time = 0;
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system_time -= excess;
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}
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}
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event.set_user(total_available_time > 0 ? (double)user_time / total_available_time : 0);
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event.set_system(total_available_time > 0 ? (double)system_time / total_available_time : 0);
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tl->set_user_time(cur_user_time);
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tl->set_cpu_time(cur_cpu_time);
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return true;
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}
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void JfrThreadCPULoadEvent::send_events() {
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Thread* periodic_thread = Thread::current();
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JfrThreadLocal* const periodic_thread_tl = periodic_thread->jfr_thread_local();
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traceid periodic_thread_id = periodic_thread_tl->thread_id();
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const int processor_count = JfrThreadCPULoadEvent::get_processor_count();
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JfrTicks event_time = JfrTicks::now();
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jlong cur_wallclock_time = JfrThreadCPULoadEvent::get_wallclock_time();
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JavaThreadIteratorWithHandle jtiwh;
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while (JavaThread* jt = jtiwh.next()) {
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EventThreadCPULoad event(UNTIMED);
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if (JfrThreadCPULoadEvent::update_event(event, jt, cur_wallclock_time, processor_count)) {
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event.set_starttime(event_time);
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if (jt != periodic_thread) {
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// Commit reads the thread id from this thread's trace data, so put it there temporarily
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periodic_thread_tl->set_thread_id(JFR_THREAD_ID(jt));
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} else {
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periodic_thread_tl->set_thread_id(periodic_thread_id);
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}
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event.commit();
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}
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}
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log_trace(jfr)("Measured CPU usage for %d threads in %.3f milliseconds", jtiwh.length(),
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(double)(JfrTicks::now() - event_time).milliseconds());
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// Restore this thread's thread id
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periodic_thread_tl->set_thread_id(periodic_thread_id);
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}
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void JfrThreadCPULoadEvent::send_event_for_thread(JavaThread* jt) {
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EventThreadCPULoad event;
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if (event.should_commit()) {
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if (update_event(event, jt, get_wallclock_time(), get_processor_count())) {
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event.commit();
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}
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}
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}
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