1 /*
2 * Copyright (c) 2001, 2009, 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
25 // A MutableSpace is a subtype of ImmutableSpace that supports the
26 // concept of allocation. This includes the concepts that a space may
27 // be only partially full, and the querry methods that go with such
28 // an assumption. MutableSpace is also responsible for minimizing the
29 // page allocation time by having the memory pretouched (with
30 // AlwaysPretouch) and for optimizing page placement on NUMA systems
31 // by make the underlying region interleaved (with UseNUMA).
32 //
33 // Invariant: (ImmutableSpace +) bottom() <= top() <= end()
34 // top() is inclusive and end() is exclusive.
35
36 class MutableSpaceMangler;
37
38 class MutableSpace: public ImmutableSpace {
39 friend class VMStructs;
40
41 // Helper for mangling unused space in debug builds
42 MutableSpaceMangler* _mangler;
43 // The last region which page had been setup to be interleaved.
44 MemRegion _last_setup_region;
119 virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
120 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
121
122 // Allocation (return NULL if full)
123 virtual HeapWord* allocate(size_t word_size);
124 virtual HeapWord* cas_allocate(size_t word_size);
125 // Optional deallocation. Used in NUMA-allocator.
126 bool cas_deallocate(HeapWord *obj, size_t size);
127
128 // Iteration.
129 void oop_iterate(OopClosure* cl);
130 void object_iterate(ObjectClosure* cl);
131
132 // Debugging
133 virtual void print() const;
134 virtual void print_on(outputStream* st) const;
135 virtual void print_short() const;
136 virtual void print_short_on(outputStream* st) const;
137 virtual void verify(bool allow_dirty);
138 };
|
1 /*
2 * Copyright (c) 2001, 2010, 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
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
27
28 #include "gc_implementation/shared/immutableSpace.hpp"
29 #include "memory/memRegion.hpp"
30 #include "utilities/copy.hpp"
31
32 // A MutableSpace is a subtype of ImmutableSpace that supports the
33 // concept of allocation. This includes the concepts that a space may
34 // be only partially full, and the querry methods that go with such
35 // an assumption. MutableSpace is also responsible for minimizing the
36 // page allocation time by having the memory pretouched (with
37 // AlwaysPretouch) and for optimizing page placement on NUMA systems
38 // by make the underlying region interleaved (with UseNUMA).
39 //
40 // Invariant: (ImmutableSpace +) bottom() <= top() <= end()
41 // top() is inclusive and end() is exclusive.
42
43 class MutableSpaceMangler;
44
45 class MutableSpace: public ImmutableSpace {
46 friend class VMStructs;
47
48 // Helper for mangling unused space in debug builds
49 MutableSpaceMangler* _mangler;
50 // The last region which page had been setup to be interleaved.
51 MemRegion _last_setup_region;
126 virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
127 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
128
129 // Allocation (return NULL if full)
130 virtual HeapWord* allocate(size_t word_size);
131 virtual HeapWord* cas_allocate(size_t word_size);
132 // Optional deallocation. Used in NUMA-allocator.
133 bool cas_deallocate(HeapWord *obj, size_t size);
134
135 // Iteration.
136 void oop_iterate(OopClosure* cl);
137 void object_iterate(ObjectClosure* cl);
138
139 // Debugging
140 virtual void print() const;
141 virtual void print_on(outputStream* st) const;
142 virtual void print_short() const;
143 virtual void print_short_on(outputStream* st) const;
144 virtual void verify(bool allow_dirty);
145 };
146
147 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
|