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/zPreMappedMemory.hpp"
33 #include "gc/z/zSafeDelete.hpp"
34 #include "gc/z/zVirtualMemory.hpp"
35 #include "memory/allocation.hpp"
36
37 class ZPageAllocRequest;
38
39 class ZPageAllocator {
40 friend class VMStructs;
41
42 private:
43 ZLock _lock;
44 ZVirtualMemoryManager _virtual;
45 ZPhysicalMemoryManager _physical;
46 ZPageCache _cache;
47 const size_t _max_reserve;
48 ZPreMappedMemory _pre_mapped;
49 size_t _used_high;
50 size_t _used_low;
51 size_t _used;
52 size_t _allocated;
53 ssize_t _reclaimed;
54 ZList<ZPageAllocRequest> _queue;
55 mutable ZSafeDelete<ZPage> _safe_delete;
56
57 static ZPage* const gc_marker;
58
59 void increase_used(size_t size, bool relocation);
60 void decrease_used(size_t size, bool reclaimed);
61
62 size_t max_available(bool no_reserve) const;
63 size_t try_ensure_unused(size_t size, bool no_reserve);
64 size_t try_ensure_unused_for_pre_mapped(size_t size);
65
66 ZPage* create_page(uint8_t type, size_t size);
67 void destroy_page(ZPage* page);
68
69 void flush_pre_mapped();
70 void flush_cache(ZPageCacheFlushClosure* cl);
71 void evict_cache(size_t requested);
72
73 void check_out_of_memory_during_initialization();
74
75 ZPage* alloc_page_common_inner(uint8_t type, size_t size, ZAllocationFlags flags);
76 ZPage* alloc_page_common(uint8_t type, size_t size, ZAllocationFlags flags);
77 ZPage* alloc_page_blocking(uint8_t type, size_t size, ZAllocationFlags flags);
78 ZPage* alloc_page_nonblocking(uint8_t type, size_t size, ZAllocationFlags flags);
79
80 void satisfy_alloc_queue();
81
82 void detach_memory(const ZVirtualMemory& vmem, ZPhysicalMemory& pmem);
83
84 public:
85 ZPageAllocator(size_t min_capacity, size_t max_capacity, size_t max_reserve);
86
87 bool is_initialized() const;
88
89 size_t max_capacity() const;
90 size_t current_max_capacity() const;
91 size_t capacity() const;
92 size_t max_reserve() const;
93 size_t used_high() const;
94 size_t used_low() const;
95 size_t used() const;
96 size_t unused() const;
97 size_t allocated() const;
98 size_t reclaimed() const;
99
100 void reset_statistics();
101
102 ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
103 void free_page(ZPage* page, bool reclaimed);
104
105 void enable_deferred_delete() const;
106 void disable_deferred_delete() const;
107
108 void map_page(ZPage* page);
109 void unmap_all_pages();
110
111 bool is_alloc_stalled() const;
112 void check_out_of_memory();
113 };
114
115 #endif // SHARE_GC_Z_ZPAGEALLOCATOR_HPP