Tue, 19 May 2015 15:49:27 +0200
8061715: gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before
Summary: added WhiteBox methods to count regions and exact aux data sizes
Reviewed-by: jwilhelm, brutisso
1 /*
2 * Copyright (c) 2014, 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
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7 * published by the Free Software Foundation.
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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
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP
28 #include "memory/allocation.hpp"
30 class CodeBlobClosure;
31 class CodeRootSetTable;
32 class HeapRegion;
33 class nmethod;
35 // Implements storage for a set of code roots.
36 // All methods that modify the set are not thread-safe except if otherwise noted.
37 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC {
38 friend class G1CodeRootSetTest;
39 private:
41 const static size_t SmallSize = 32;
42 const static size_t Threshold = 24;
43 const static size_t LargeSize = 512;
45 CodeRootSetTable* _table;
46 CodeRootSetTable* load_acquire_table();
48 size_t _length;
50 void move_to_large();
51 void allocate_small_table();
53 public:
54 G1CodeRootSet() : _table(NULL), _length(0) {}
55 ~G1CodeRootSet();
57 static void purge();
59 static size_t static_mem_size();
61 void add(nmethod* method);
63 bool remove(nmethod* method);
65 // Safe to call without synchronization, but may return false negatives.
66 bool contains(nmethod* method);
68 void clear();
70 void nmethods_do(CodeBlobClosure* blk) const;
72 // Remove all nmethods which no longer contain pointers into our "owner" region
73 void clean(HeapRegion* owner);
75 bool is_empty() {
76 bool empty = length() == 0;
77 assert(empty == (_table == NULL), "is empty only if table is deallocated");
78 return empty;
79 }
81 // Length in elements
82 size_t length() const { return _length; }
84 // Memory size in bytes taken by this set.
85 size_t mem_size();
87 };
89 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP