1 /*
2 * Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include "precompiled.hpp"
25 #include "gc/shared/gc_globals.hpp"
26 #include "gc/z/zHeap.inline.hpp"
27 #include "gc/z/zLock.inline.hpp"
28 #include "gc/z/zStat.hpp"
29 #include "gc/z/zUncommitter.hpp"
30 #include "jfr/jfrEvents.hpp"
31 #include "logging/log.hpp"
32
33 static const ZStatCounter ZCounterUncommit("Memory", "Uncommit", ZStatUnitBytesPerSecond);
34
ZUncommitter(ZPageAllocator * page_allocator)35 ZUncommitter::ZUncommitter(ZPageAllocator* page_allocator) :
36 _page_allocator(page_allocator),
37 _lock(),
38 _stop(false) {
39 set_name("ZUncommitter");
40 create_and_start();
41 }
42
wait(uint64_t timeout) const43 bool ZUncommitter::wait(uint64_t timeout) const {
44 ZLocker<ZConditionLock> locker(&_lock);
45 while (!ZUncommit && !_stop) {
46 _lock.wait();
47 }
48
49 if (!_stop && timeout > 0) {
50 log_debug(gc, heap)("Uncommit Timeout: " UINT64_FORMAT "s", timeout);
51 _lock.wait(timeout * MILLIUNITS);
52 }
53
54 return !_stop;
55 }
56
should_continue() const57 bool ZUncommitter::should_continue() const {
58 ZLocker<ZConditionLock> locker(&_lock);
59 return !_stop;
60 }
61
run_service()62 void ZUncommitter::run_service() {
63 uint64_t timeout = 0;
64
65 while (wait(timeout)) {
66 EventZUncommit event;
67 size_t uncommitted = 0;
68
69 while (should_continue()) {
70 // Uncommit chunk
71 const size_t flushed = _page_allocator->uncommit(&timeout);
72 if (flushed == 0) {
73 // Done
74 break;
75 }
76
77 uncommitted += flushed;
78 }
79
80 if (uncommitted > 0) {
81 // Update statistics
82 ZStatInc(ZCounterUncommit, uncommitted);
83 log_info(gc, heap)("Uncommitted: " SIZE_FORMAT "M(%.0f%%)",
84 uncommitted / M, percent_of(uncommitted, ZHeap::heap()->max_capacity()));
85
86 // Send event
87 event.commit(uncommitted);
88 }
89 }
90 }
91
stop_service()92 void ZUncommitter::stop_service() {
93 ZLocker<ZConditionLock> locker(&_lock);
94 _stop = true;
95 _lock.notify_all();
96 }
97