1 /*
2 * Copyright (c) 2015, 2020, 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 #ifndef SHARE_GC_Z_ZPAGEALLOCATOR_HPP
25 #define SHARE_GC_Z_ZPAGEALLOCATOR_HPP
26
27 #include "gc/z/zAllocationFlags.hpp"
28 #include "gc/z/zList.hpp"
29 #include "gc/z/zLock.hpp"
30 #include "gc/z/zPageCache.hpp"
31 #include "gc/z/zPhysicalMemory.hpp"
32 #include "gc/z/zSafeDelete.hpp"
33 #include "gc/z/zVirtualMemory.hpp"
34 #include "memory/allocation.hpp"
35
36 class ZPageAllocation;
37 class ZWorkers;
38
39 class ZPageAllocator {
40 friend class VMStructs;
41
42 private:
43 ZLock _lock;
44 ZPageCache _cache;
45 ZVirtualMemoryManager _virtual;
46 ZPhysicalMemoryManager _physical;
47 const size_t _min_capacity;
48 const size_t _max_capacity;
49 const size_t _max_reserve;
50 volatile size_t _current_max_capacity;
51 volatile size_t _capacity;
52 volatile size_t _used;
53 size_t _used_high;
54 size_t _used_low;
55 size_t _allocated;
56 ssize_t _reclaimed;
57 ZList<ZPageAllocation> _stalled;
58 ZList<ZPageAllocation> _satisfied;
59 mutable ZSafeDelete<ZPage> _safe_delete;
60 volatile bool _uncommit;
61 bool _initialized;
62
63 bool prime_cache(ZWorkers* workers, size_t size);
64
65 size_t increase_capacity(size_t size);
66 void decrease_capacity(size_t size, bool set_max_capacity);
67
68 void increase_used(size_t size, bool allocation, bool relocation);
69 void decrease_used(size_t size, bool free, bool reclaimed);
70
71 bool commit_page(ZPage* page);
72 void uncommit_page(ZPage* page);
73
74 bool map_page(const ZPage* page) const;
75 void unmap_page(const ZPage* page) const;
76
77 void destroy_page(ZPage* page);
78
79 bool is_alloc_allowed(size_t size, bool no_reserve) const;
80 bool is_alloc_allowed_from_cache(size_t size, bool no_reserve) const;
81
82 bool alloc_page_common_inner(uint8_t type, size_t size, bool no_reserve, ZList<ZPage>* pages);
83 bool alloc_page_common(ZPageAllocation* allocation);
84 bool alloc_page_stall(ZPageAllocation* allocation);
85 bool alloc_page_prepare(ZPageAllocation* allocation);
86 ZPage* alloc_page_create(ZPageAllocation* allocation);
87 ZPage* alloc_page_finish(ZPageAllocation* allocation);
88 void alloc_page_failed(ZPageAllocation* allocation);
89
90 void satisfy_stalled();
91
92 size_t uncommit_inner(uint64_t delay, uint64_t* timeout);
93
94 public:
95 ZPageAllocator(ZWorkers* workers,
96 size_t min_capacity,
97 size_t initial_capacity,
98 size_t max_capacity,
99 size_t max_reserve);
100
101 bool is_initialized() const;
102
103 size_t min_capacity() const;
104 size_t max_capacity() const;
105 size_t soft_max_capacity() const;
106 size_t capacity() const;
107 size_t max_reserve() const;
108 size_t used_high() const;
109 size_t used_low() const;
110 size_t used() const;
111 size_t unused() const;
112 size_t allocated() const;
113 size_t reclaimed() const;
114
115 void reset_statistics();
116
117 ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
118 void free_page(ZPage* page, bool reclaimed);
119
120 uint64_t uncommit();
121 void uncommit_cancel();
122
123 void enable_deferred_delete() const;
124 void disable_deferred_delete() const;
125
126 void debug_map_page(const ZPage* page) const;
127 void debug_unmap_page(const ZPage* page) const;
128
129 bool is_alloc_stalled() const;
130 void check_out_of_memory();
131
132 void pages_do(ZPageClosure* cl) const;
133 };
134
135 #endif // SHARE_GC_Z_ZPAGEALLOCATOR_HPP