1 /*
2 * Copyright Amazon.com Inc. 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
26 #include "gc/shared/gc_globals.hpp"
27 #include "gc/shenandoah/shenandoahController.hpp"
28 #include "gc/shenandoah/shenandoahHeap.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
30
31 void ShenandoahController::pacing_notify_alloc(size_t words) {
32 assert(ShenandoahPacing, "should only call when pacing is enabled");
33 Atomic::add(&_allocs_seen, words, memory_order_relaxed);
34 }
35
36 size_t ShenandoahController::reset_allocs_seen() {
37 return Atomic::xchg(&_allocs_seen, (size_t)0, memory_order_relaxed);
38 }
39
40 void ShenandoahController::prepare_for_graceful_shutdown() {
41 _graceful_shutdown.set();
42 }
43
44 bool ShenandoahController::in_graceful_shutdown() {
45 return _graceful_shutdown.is_set();
46 }
47
48 void ShenandoahController::update_gc_id() {
49 Atomic::inc(&_gc_id);
50 }
51
52 size_t ShenandoahController::get_gc_id() {
53 return Atomic::load(&_gc_id);
54 }
55
56 void ShenandoahController::handle_alloc_failure(ShenandoahAllocRequest& req, bool block) {
57 ShenandoahHeap* heap = ShenandoahHeap::heap();
58
59 assert(current()->is_Java_thread(), "expect Java thread here");
60 bool is_humongous = req.size() > ShenandoahHeapRegion::humongous_threshold_words();
61
62 if (try_set_alloc_failure_gc(is_humongous)) {
63 // Only report the first allocation failure
64 log_info(gc)("Failed to allocate %s, " SIZE_FORMAT "%s",
65 req.type_string(),
66 byte_size_in_proper_unit(req.size() * HeapWordSize), proper_unit_for_byte_size(req.size() * HeapWordSize));
67
68 // Now that alloc failure GC is scheduled, we can abort everything else
69 heap->cancel_gc(GCCause::_allocation_failure);
70 }
71
72
73 if (block) {
74 MonitorLocker ml(&_alloc_failure_waiters_lock);
75 while (is_alloc_failure_gc()) {
76 ml.wait();
77 }
78 }
79 }
80
81 void ShenandoahController::handle_alloc_failure_evac(size_t words) {
82 ShenandoahHeap* heap = ShenandoahHeap::heap();
83 bool is_humongous = (words > ShenandoahHeapRegion::region_size_words());
84
85 if (try_set_alloc_failure_gc(is_humongous)) {
86 // Only report the first allocation failure
87 log_info(gc)("Failed to allocate " SIZE_FORMAT "%s for evacuation",
88 byte_size_in_proper_unit(words * HeapWordSize), proper_unit_for_byte_size(words * HeapWordSize));
89 }
90
91 // Forcefully report allocation failure
92 heap->cancel_gc(GCCause::_shenandoah_allocation_failure_evac);
93 }
94
95 void ShenandoahController::notify_alloc_failure_waiters() {
96 _alloc_failure_gc.unset();
97 _humongous_alloc_failure_gc.unset();
98 MonitorLocker ml(&_alloc_failure_waiters_lock);
99 ml.notify_all();
100 }
101
102 bool ShenandoahController::try_set_alloc_failure_gc(bool is_humongous) {
103 if (is_humongous) {
104 _humongous_alloc_failure_gc.try_set();
105 }
106 return _alloc_failure_gc.try_set();
107 }
108
109 bool ShenandoahController::is_alloc_failure_gc() {
110 return _alloc_failure_gc.is_set();
111 }
112