75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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* Copyright (c) 2019, 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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#include "precompiled.hpp"
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#include "gc/z/zHeap.inline.hpp"
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#include "gc/z/zUncommitter.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.hpp"
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ZUncommitter::ZUncommitter() :
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_monitor(Monitor::leaf, "ZUncommitter", false, Monitor::_safepoint_check_never),
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_stop(false) {
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set_name("ZUncommitter");
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create_and_start();
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}
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bool ZUncommitter::idle(uint64_t timeout) {
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// Idle for at least one second
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const uint64_t expires = os::elapsedTime() + MAX2<uint64_t>(timeout, 1);
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for (;;) {
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// We might wake up spuriously from wait, so always recalculate
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// the timeout after a wakeup to see if we need to wait again.
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const uint64_t now = os::elapsedTime();
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const uint64_t remaining = expires - MIN2(expires, now);
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MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag);
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if (remaining > 0 && !_stop) {
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ml.wait(remaining * MILLIUNITS);
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} else {
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return !_stop;
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}
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}
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}
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void ZUncommitter::run_service() {
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for (;;) {
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// Try uncommit unused memory
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const uint64_t timeout = ZHeap::heap()->uncommit(ZUncommitDelay);
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log_trace(gc, heap)("Uncommit Timeout: " UINT64_FORMAT "s", timeout);
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// Idle until next attempt
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if (!idle(timeout)) {
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return;
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}
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}
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}
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void ZUncommitter::stop_service() {
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MonitorLocker ml(&_monitor, Monitor::_no_safepoint_check_flag);
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_stop = true;
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ml.notify();
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}
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