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/*
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* Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_coTracker.cpp.incl"
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COTracker* COTracker::_head = NULL;
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double COTracker::_cpu_number = -1.0;
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void
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COTracker::resetPeriod(double now_sec, double vnow_sec) {
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guarantee( _enabled, "invariant" );
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_period_start_time_sec = now_sec;
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_period_start_vtime_sec = vnow_sec;
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}
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void
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COTracker::setConcOverhead(double time_stamp_sec,
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double conc_overhead) {
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guarantee( _enabled, "invariant" );
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_conc_overhead = conc_overhead;
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_time_stamp_sec = time_stamp_sec;
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if (conc_overhead > 0.001)
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_conc_overhead_seq.add(conc_overhead);
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}
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void
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COTracker::reset(double starting_conc_overhead) {
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guarantee( _enabled, "invariant" );
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double now_sec = os::elapsedTime();
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setConcOverhead(now_sec, starting_conc_overhead);
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}
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void
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COTracker::start() {
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guarantee( _enabled, "invariant" );
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resetPeriod(os::elapsedTime(), os::elapsedVTime());
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}
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void
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COTracker::update(bool force_end) {
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assert( _enabled, "invariant" );
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double end_time_sec = os::elapsedTime();
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double elapsed_time_sec = end_time_sec - _period_start_time_sec;
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if (force_end || elapsed_time_sec > _update_period_sec) {
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// reached the end of the period
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double end_vtime_sec = os::elapsedVTime();
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double elapsed_vtime_sec = end_vtime_sec - _period_start_vtime_sec;
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double conc_overhead = elapsed_vtime_sec / elapsed_time_sec;
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setConcOverhead(end_time_sec, conc_overhead);
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resetPeriod(end_time_sec, end_vtime_sec);
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}
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}
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void
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COTracker::updateForSTW(double start_sec, double end_sec) {
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if (!_enabled)
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return;
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// During a STW pause, no concurrent GC thread has done any
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// work. So, we can safely adjust the start of the current period by
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// adding the duration of the STW pause to it, so that the STW pause
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// doesn't affect the reading of the concurrent overhead (it's
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// basically like excluding the time of the STW pause from the
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// concurrent overhead calculation).
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double stw_duration_sec = end_sec - start_sec;
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guarantee( stw_duration_sec > 0.0, "invariant" );
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if (outOfDate(start_sec))
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_conc_overhead = 0.0;
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else
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_time_stamp_sec = end_sec;
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_period_start_time_sec += stw_duration_sec;
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_conc_overhead_seq = NumberSeq();
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guarantee( os::elapsedTime() > _period_start_time_sec, "invariant" );
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}
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double
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COTracker::predConcOverhead() {
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if (_enabled) {
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// tty->print(" %1.2lf", _conc_overhead_seq.maximum());
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return _conc_overhead_seq.maximum();
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} else {
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// tty->print(" DD");
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return 0.0;
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}
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}
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void
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COTracker::resetPred() {
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_conc_overhead_seq = NumberSeq();
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}
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COTracker::COTracker(int group)
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: _enabled(false),
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_group(group),
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_period_start_time_sec(-1.0),
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_period_start_vtime_sec(-1.0),
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_conc_overhead(-1.0),
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_time_stamp_sec(-1.0),
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_next(NULL) {
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// GCOverheadReportingPeriodMS indicates how frequently the
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// concurrent overhead will be recorded by the GC Overhead
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// Reporter. We want to take readings less often than that. If we
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// took readings more often than some of them might be lost.
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_update_period_sec = ((double) GCOverheadReportingPeriodMS) / 1000.0 * 1.25;
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_next = _head;
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_head = this;
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if (_cpu_number < 0.0)
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_cpu_number = (double) os::processor_count();
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}
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// statics
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void
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COTracker::updateAllForSTW(double start_sec, double end_sec) {
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for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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curr->updateForSTW(start_sec, end_sec);
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}
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}
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double
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COTracker::totalConcOverhead(double now_sec) {
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double total_conc_overhead = 0.0;
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for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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double conc_overhead = curr->concOverhead(now_sec);
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total_conc_overhead += conc_overhead;
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}
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return total_conc_overhead;
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}
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double
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COTracker::totalConcOverhead(double now_sec,
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size_t group_num,
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double* co_per_group) {
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double total_conc_overhead = 0.0;
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for (size_t i = 0; i < group_num; ++i)
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co_per_group[i] = 0.0;
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for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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size_t group = curr->_group;
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assert( 0 <= group && group < group_num, "invariant" );
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double conc_overhead = curr->concOverhead(now_sec);
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co_per_group[group] += conc_overhead;
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total_conc_overhead += conc_overhead;
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}
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return total_conc_overhead;
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}
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double
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COTracker::totalPredConcOverhead() {
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double total_pred_conc_overhead = 0.0;
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for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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total_pred_conc_overhead += curr->predConcOverhead();
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curr->resetPred();
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}
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return total_pred_conc_overhead / _cpu_number;
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}
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