1 /*
2 * Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "gc/shenandoah/shenandoahMemoryPool.hpp"
28 #include "gc/shenandoah/shenandoahYoungGeneration.hpp"
29 #include "gc/shenandoah/shenandoahOldGeneration.hpp"
30
31 ShenandoahMemoryPool::ShenandoahMemoryPool(ShenandoahHeap* heap,
32 const char* name) :
33 CollectedMemoryPool(name,
34 heap->initial_capacity(),
35 heap->max_capacity(),
36 true /* support_usage_threshold */),
37 _heap(heap) {}
38
39 ShenandoahMemoryPool::ShenandoahMemoryPool(ShenandoahHeap* heap,
40 const char* name,
41 size_t initial_capacity,
42 size_t max_capacity) :
43 CollectedMemoryPool(name,
44 initial_capacity,
45 max_capacity,
46 true /* support_usage_threshold */),
47 _heap(heap) {}
48
49
50 MemoryUsage ShenandoahMemoryPool::get_memory_usage() {
51 size_t initial = initial_size();
52 size_t max = max_size();
53 size_t used = used_in_bytes();
54 size_t committed = _heap->committed();
55
56 // These asserts can never fail: max is stable, and all updates to other values never overflow max.
57 assert(initial <= max, "initial: " SIZE_FORMAT ", max: " SIZE_FORMAT, initial, max);
58 assert(used <= max, "used: " SIZE_FORMAT ", max: " SIZE_FORMAT, used, max);
59 assert(committed <= max, "committed: " SIZE_FORMAT ", max: " SIZE_FORMAT, committed, max);
60
61 // Committed and used are updated concurrently and independently. They can momentarily break
62 // the assert below, which would also fail in downstream code. To avoid that, adjust values
63 // to make sense under the race. See JDK-8207200.
64 committed = MAX2(used, committed);
65 assert(used <= committed, "used: " SIZE_FORMAT ", committed: " SIZE_FORMAT, used, committed);
66
67 return MemoryUsage(initial, used, committed, max);
68 }
69
70 size_t ShenandoahMemoryPool::used_in_bytes() {
71 return _heap->used();
72 }
73
74 size_t ShenandoahMemoryPool::max_size() const {
75 return _heap->max_capacity();
76 }
77
78 ShenandoahGenerationalMemoryPool::ShenandoahGenerationalMemoryPool(ShenandoahHeap* heap, const char* name,
79 ShenandoahGeneration* generation) :
80 ShenandoahMemoryPool(heap, name, 0, heap->max_capacity()),
81 _generation(generation) { }
82
83 MemoryUsage ShenandoahGenerationalMemoryPool::get_memory_usage() {
84 size_t initial = initial_size();
85 size_t max = max_size();
86 size_t used = used_in_bytes();
87 size_t committed = _generation->used_regions_size();
88
89 return MemoryUsage(initial, used, committed, max);
90 }
91
92 size_t ShenandoahGenerationalMemoryPool::used_in_bytes() {
93 return _generation->used();
94 }
95
96 ShenandoahYoungGenMemoryPool::ShenandoahYoungGenMemoryPool(ShenandoahHeap* heap) :
97 ShenandoahGenerationalMemoryPool(heap,
98 "Shenandoah Young Gen",
99 heap->young_generation()) { }
100
101 ShenandoahOldGenMemoryPool::ShenandoahOldGenMemoryPool(ShenandoahHeap* heap) :
102 ShenandoahGenerationalMemoryPool(heap,
103 "Shenandoah Old Gen",
104 heap->old_generation()) { }