1/*
2 * Copyright (c) 2011, 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.
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24
25#ifndef SHARE_GC_SHARED_HSPACECOUNTERS_HPP
26#define SHARE_GC_SHARED_HSPACECOUNTERS_HPP
27
28#include "memory/allocation.hpp"
29#include "runtime/perfData.hpp"
30#include "utilities/macros.hpp"
31
32// A HSpaceCounter is a holder class for performance counters
33// that track a collections (logical spaces) in a heap;
34
35class HSpaceCounters: public CHeapObj<mtGC> {
36 friend class VMStructs;
37
38 private:
39 PerfVariable* _capacity;
40 PerfVariable* _used;
41
42 // Constant PerfData types don't need to retain a reference.
43 // However, it's a good idea to document them here.
44
45 char* _name_space;
46
47 public:
48
49 HSpaceCounters(const char* name_space, const char* name, int ordinal,
50 size_t max_size, size_t initial_capacity);
51
52 ~HSpaceCounters();
53
54 void update_capacity(size_t v);
55 void update_used(size_t v);
56
57 void update_all(size_t capacity, size_t used);
58
59 debug_only(
60 // for security reasons, we do not allow arbitrary reads from
61 // the counters as they may live in shared memory.
62 jlong used();
63 jlong capacity();
64 )
65
66 const char* name_space() const { return _name_space; }
67};
68#endif // SHARE_GC_SHARED_HSPACECOUNTERS_HPP
69