123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
/*
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* Copyright (c) 2015, 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 "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1CollectorPolicy.hpp"
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#include "gc/g1/g1YoungRemSetSamplingThread.hpp"
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#include "gc/g1/suspendibleThreadSet.hpp"
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#include "runtime/mutexLocker.hpp"
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void G1YoungRemSetSamplingThread::run() {
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initialize_in_thread();
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wait_for_universe_init();
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run_service();
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terminate();
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}
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void G1YoungRemSetSamplingThread::stop() {
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// it is ok to take late safepoints here, if needed
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{
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MutexLockerEx mu(Terminator_lock);
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_should_terminate = true;
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}
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stop_service();
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{
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MutexLockerEx mu(Terminator_lock);
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while (!_has_terminated) {
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Terminator_lock->wait();
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}
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}
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}
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G1YoungRemSetSamplingThread::G1YoungRemSetSamplingThread() : ConcurrentGCThread() {
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_monitor = new Monitor(Mutex::nonleaf,
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"G1YoungRemSetSamplingThread monitor",
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true,
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Monitor::_safepoint_check_never);
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create_and_start();
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set_name("G1 Young RemSet Sampling");
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}
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void G1YoungRemSetSamplingThread::sleep_before_next_cycle() {
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MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
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if (!_should_terminate) {
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intx waitms = G1ConcRefinementServiceIntervalMillis; // 300, really should be?
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_monitor->wait(Mutex::_no_safepoint_check_flag, waitms);
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}
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}
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void G1YoungRemSetSamplingThread::run_service() {
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double vtime_start = os::elapsedVTime();
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while (!_should_terminate) {
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sample_young_list_rs_lengths();
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if (os::supports_vtime()) {
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_vtime_accum = (os::elapsedVTime() - vtime_start);
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} else {
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_vtime_accum = 0.0;
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}
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sleep_before_next_cycle();
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}
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}
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void G1YoungRemSetSamplingThread::stop_service() {
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MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
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_monitor->notify();
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}
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void G1YoungRemSetSamplingThread::sample_young_list_rs_lengths() {
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SuspendibleThreadSetJoiner sts;
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G1CollectedHeap* g1h = G1CollectedHeap::heap();
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G1CollectorPolicy* g1p = g1h->g1_policy();
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if (g1p->adaptive_young_list_length()) {
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int regions_visited = 0;
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g1h->young_list()->rs_length_sampling_init();
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while (g1h->young_list()->rs_length_sampling_more()) {
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g1h->young_list()->rs_length_sampling_next();
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++regions_visited;
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// we try to yield every time we visit 10 regions
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if (regions_visited == 10) {
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if (sts.should_yield()) {
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sts.yield();
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// we just abandon the iteration
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break;
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}
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regions_visited = 0;
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}
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}
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g1p->revise_young_list_target_length_if_necessary();
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}
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}
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