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
35 class ZPageAllocation;
36 class ZWorkers;
37
38 class ZPageAllocator {
39 friend class VMStructs;
40
41 private:
42 ZLock _lock;
43 ZPageCache _cache;
44 ZVirtualMemoryManager _virtual;
45 ZPhysicalMemoryManager _physical;
46 const size_t _min_capacity;
47 const size_t _max_capacity;
48 const size_t _max_reserve;
49 volatile size_t _current_max_capacity;
50 volatile size_t _capacity;
51 volatile size_t _used;
52 size_t _used_high;
53 size_t _used_low;
54 size_t _allocated;
55 ssize_t _reclaimed;
56 ZList<ZPageAllocation> _stalled;
57 ZList<ZPageAllocation> _satisfied;
58 mutable ZSafeDelete<ZPage> _safe_delete;
59 volatile bool _uncommit;
60 bool _initialized;
61
62 bool prime_cache(ZWorkers* workers, size_t size);
63
64 size_t increase_capacity(size_t size);
65 void decrease_capacity(size_t size, bool set_max_capacity);
66
67 void increase_used(size_t size, bool allocation, bool relocation);
68 void decrease_used(size_t size, bool free, bool reclaimed);
69
70 bool commit_page(ZPage* page);
71 void uncommit_page(ZPage* page);
72
73 bool map_page(const ZPage* page) const;
74 void unmap_page(const ZPage* page) const;
75
76 void destroy_page(ZPage* page);
77
78 bool is_alloc_allowed(size_t size, bool no_reserve) const;
79 bool is_alloc_allowed_from_cache(size_t size, bool no_reserve) const;
80
81 bool alloc_page_common_inner(uint8_t type, size_t size, bool no_reserve, ZList<ZPage>* pages);
82 bool alloc_page_common(ZPageAllocation* allocation);
83 bool alloc_page_stall(ZPageAllocation* allocation);
84 bool alloc_page_stage0(ZPageAllocation* allocation);
85 ZPage* alloc_page_create(ZPageAllocation* allocation);
86 ZPage* alloc_page_stage1(ZPageAllocation* allocation);
87 void alloc_page_failed(ZPageAllocation* allocation);
88
89 void satisfy_stalled();
90
91 size_t uncommit_inner(uint64_t delay, uint64_t* timeout);
92
93 public:
94 ZPageAllocator(ZWorkers* workers,
95 size_t min_capacity,
96 size_t initial_capacity,
97 size_t max_capacity,
98 size_t max_reserve);
99
100 bool is_initialized() const;
101
102 size_t min_capacity() const;
103 size_t max_capacity() const;
104 size_t soft_max_capacity() const;
105 size_t capacity() const;
106 size_t max_reserve() const;
107 size_t used_high() const;
108 size_t used_low() const;
109 size_t used() const;
110 size_t unused() const;
111 size_t allocated() const;
112 size_t reclaimed() const;
113
114 void reset_statistics();
115
116 ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
117 void free_page(ZPage* page, bool reclaimed);
118
119 uint64_t uncommit();
120 void uncommit_cancel();
121
122 void enable_deferred_delete() const;
123 void disable_deferred_delete() const;
124
125 void debug_map_page(const ZPage* page) const;
126 void debug_unmap_page(const ZPage* page) const;
127
128 bool is_alloc_stalled() const;
129 void check_out_of_memory();
130
131 void pages_do(ZPageClosure* cl) const;
132 };
133
134 #endif // SHARE_GC_Z_ZPAGEALLOCATOR_HPP