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_ZPAGECACHE_HPP
25#define SHARE_GC_Z_ZPAGECACHE_HPP
26
27#include "gc/z/zList.hpp"
28#include "gc/z/zPage.hpp"
29#include "gc/z/zValue.hpp"
30#include "memory/allocation.hpp"
31
32class ZPageCacheFlushClosure : public StackObj {
33protected:
34 const size_t _requested;
35 size_t _flushed;
36
37public:
38 ZPageCacheFlushClosure(size_t requested);
39 size_t overflushed() const;
40 virtual bool do_page(const ZPage* page) = 0;
41};
42
43class ZPageCache {
44private:
45 size_t _available;
46 ZPerNUMA<ZList<ZPage> > _small;
47 ZList<ZPage> _medium;
48 ZList<ZPage> _large;
49
50 ZPage* alloc_small_page();
51 ZPage* alloc_medium_page();
52 ZPage* alloc_large_page(size_t size);
53
54 ZPage* alloc_oversized_medium_page(size_t size);
55 ZPage* alloc_oversized_large_page(size_t size);
56 ZPage* alloc_oversized_page(size_t size);
57
58 void free_page_inner(ZPage* page);
59
60 bool flush_list_inner(ZPageCacheFlushClosure* cl, ZList<ZPage>* from, ZList<ZPage>* to);
61 void flush_list(ZPageCacheFlushClosure* cl, ZList<ZPage>* from, ZList<ZPage>* to);
62 void flush_per_numa_lists(ZPageCacheFlushClosure* cl, ZPerNUMA<ZList<ZPage> >* from, ZList<ZPage>* to);
63
64public:
65 ZPageCache();
66
67 size_t available() const;
68
69 ZPage* alloc_page(uint8_t type, size_t size);
70 void free_page(ZPage* page);
71
72 void flush(ZPageCacheFlushClosure* cl, ZList<ZPage>* to);
73
74 template <typename Closure> void pages_do(Closure* cl) const;
75};
76
77#endif // SHARE_GC_Z_ZPAGECACHE_HPP
78