1 /*
2 * Copyright (c) 2015, 2019, 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 ZPageAllocRequest;
37
38 class ZPageAllocator {
39 friend class VMStructs;
40
41 private:
42 ZLock _lock;
43 ZVirtualMemoryManager _virtual;
44 ZPhysicalMemoryManager _physical;
45 ZPageCache _cache;
46 const size_t _min_capacity;
47 const size_t _max_capacity;
48 const size_t _max_reserve;
49 size_t _current_max_capacity;
50 size_t _capacity;
51 size_t _used_high;
52 size_t _used_low;
53 size_t _used;
54 size_t _allocated;
55 ssize_t _reclaimed;
56 ZList<ZPageAllocRequest> _queue;
57 mutable ZSafeDelete<ZPage> _safe_delete;
58 bool _uncommit;
59 bool _initialized;
60
61 static ZPage* const gc_marker;
62
63 void prime_cache(size_t size);
64
65 void increase_used(size_t size, bool relocation);
66 void decrease_used(size_t size, bool reclaimed);
67
68 ZPage* create_page(uint8_t type, size_t size);
69 void destroy_page(ZPage* page);
70
71 size_t max_available(bool no_reserve) const;
72 bool ensure_available(size_t size, bool no_reserve);
73 void ensure_uncached_available(size_t size);
74
75 void check_out_of_memory_during_initialization();
76
77 ZPage* alloc_page_common_inner(uint8_t type, size_t size, bool no_reserve);
78 ZPage* alloc_page_common(uint8_t type, size_t size, ZAllocationFlags flags);
79 ZPage* alloc_page_blocking(uint8_t type, size_t size, ZAllocationFlags flags);
80 ZPage* alloc_page_nonblocking(uint8_t type, size_t size, ZAllocationFlags flags);
81
82 size_t flush_cache(ZPageCacheFlushClosure* cl);
83 void flush_cache_for_allocation(size_t requested);
84
85 void satisfy_alloc_queue();
86
87 public:
88 ZPageAllocator(size_t min_capacity,
89 size_t initial_capacity,
90 size_t max_capacity,
91 size_t max_reserve);
92
93 bool is_initialized() const;
94
95 size_t min_capacity() const;
96 size_t max_capacity() const;
97 size_t current_max_capacity() const;
98 size_t capacity() const;
99 size_t max_reserve() const;
100 size_t used_high() const;
101 size_t used_low() const;
102 size_t used() const;
103 size_t unused() const;
104 size_t allocated() const;
105 size_t reclaimed() const;
106
107 void reset_statistics();
108
109 ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
110 void free_page(ZPage* page, bool reclaimed);
111
112 uint64_t uncommit(uint64_t delay);
113
114 void enable_deferred_delete() const;
115 void disable_deferred_delete() const;
116
117 void map_page(ZPage* page);
118 void unmap_all_pages();
119
120 bool is_alloc_stalled() const;
121 void check_out_of_memory();
122 };
123
124 #endif // SHARE_GC_Z_ZPAGEALLOCATOR_HPP