Thu, 14 Mar 2013 09:37:38 +0100
6733980: par compact - TraceGen1Time always shows 0.0000 seconds
Summary: Use the correct collector to retrieve accumulated gen1 trace time
Reviewed-by: johnc, jmasa
1 /*
2 * Copyright (c) 2003, 2012, 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
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP
28 #include "runtime/virtualspace.hpp"
30 // VirtualSpace for the parallel scavenge collector.
31 //
32 // VirtualSpace is data structure for committing a previously reserved address
33 // range in smaller chunks.
35 class PSVirtualSpace : public CHeapObj<mtGC> {
36 friend class VMStructs;
37 protected:
38 // The space is committed/uncommited in chunks of size _alignment. The
39 // ReservedSpace passed to initialize() must be aligned to this value.
40 const size_t _alignment;
42 // Reserved area
43 char* _reserved_low_addr;
44 char* _reserved_high_addr;
46 // Committed area
47 char* _committed_low_addr;
48 char* _committed_high_addr;
50 // The entire space has been committed and pinned in memory, no
51 // os::commit_memory() or os::uncommit_memory().
52 bool _special;
54 // Convenience wrapper.
55 inline static size_t pointer_delta(const char* left, const char* right);
57 public:
58 PSVirtualSpace(ReservedSpace rs, size_t alignment);
59 PSVirtualSpace(ReservedSpace rs);
61 ~PSVirtualSpace();
63 // Eventually all instances should be created with the above 1- or 2-arg
64 // constructors. Then the 1st constructor below should become protected and
65 // the 2nd ctor and initialize() removed.
66 PSVirtualSpace(size_t alignment): _alignment(alignment) { }
67 PSVirtualSpace();
68 bool initialize(ReservedSpace rs, size_t commit_size);
70 bool contains(void* p) const;
72 // Accessors (all sizes are bytes).
73 size_t alignment() const { return _alignment; }
74 char* reserved_low_addr() const { return _reserved_low_addr; }
75 char* reserved_high_addr() const { return _reserved_high_addr; }
76 char* committed_low_addr() const { return _committed_low_addr; }
77 char* committed_high_addr() const { return _committed_high_addr; }
78 bool special() const { return _special; }
80 inline size_t committed_size() const;
81 inline size_t reserved_size() const;
82 inline size_t uncommitted_size() const;
84 // Operations.
85 inline void set_reserved(char* low_addr, char* high_addr, bool special);
86 inline void set_reserved(ReservedSpace rs);
87 inline void set_committed(char* low_addr, char* high_addr);
88 virtual bool expand_by(size_t bytes);
89 virtual bool shrink_by(size_t bytes);
90 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
91 void release();
93 #ifndef PRODUCT
94 // Debugging
95 static bool is_aligned(size_t val, size_t align);
96 bool is_aligned(size_t val) const;
97 bool is_aligned(char* val) const;
98 void verify() const;
99 void print() const;
100 virtual bool grows_up() const { return true; }
101 bool grows_down() const { return !grows_up(); }
103 // Helper class to verify a space when entering/leaving a block.
104 class PSVirtualSpaceVerifier: public StackObj {
105 private:
106 const PSVirtualSpace* const _space;
107 public:
108 PSVirtualSpaceVerifier(PSVirtualSpace* space): _space(space) {
109 _space->verify();
110 }
111 ~PSVirtualSpaceVerifier() { _space->verify(); }
112 };
113 #endif
115 virtual void print_space_boundaries_on(outputStream* st) const;
117 // Included for compatibility with the original VirtualSpace.
118 public:
119 // Committed area
120 char* low() const { return committed_low_addr(); }
121 char* high() const { return committed_high_addr(); }
123 // Reserved area
124 char* low_boundary() const { return reserved_low_addr(); }
125 char* high_boundary() const { return reserved_high_addr(); }
126 };
128 // A virtual space that grows from high addresses to low addresses.
129 class PSVirtualSpaceHighToLow : public PSVirtualSpace {
130 friend class VMStructs;
131 public:
132 PSVirtualSpaceHighToLow(ReservedSpace rs, size_t alignment);
133 PSVirtualSpaceHighToLow(ReservedSpace rs);
135 virtual bool expand_by(size_t bytes);
136 virtual bool shrink_by(size_t bytes);
137 virtual size_t expand_into(PSVirtualSpace* space, size_t bytes);
139 virtual void print_space_boundaries_on(outputStream* st) const;
141 #ifndef PRODUCT
142 // Debugging
143 virtual bool grows_up() const { return false; }
144 #endif
145 };
147 //
148 // PSVirtualSpace inlines.
149 //
150 inline size_t
151 PSVirtualSpace::pointer_delta(const char* left, const char* right) {
152 return ::pointer_delta((void *)left, (void*)right, sizeof(char));
153 }
155 inline size_t PSVirtualSpace::committed_size() const {
156 return pointer_delta(committed_high_addr(), committed_low_addr());
157 }
159 inline size_t PSVirtualSpace::reserved_size() const {
160 return pointer_delta(reserved_high_addr(), reserved_low_addr());
161 }
163 inline size_t PSVirtualSpace::uncommitted_size() const {
164 return reserved_size() - committed_size();
165 }
167 inline void PSVirtualSpace::set_reserved(char* low_addr, char* high_addr, bool special) {
168 _reserved_low_addr = low_addr;
169 _reserved_high_addr = high_addr;
170 _special = special;
171 }
173 inline void PSVirtualSpace::set_reserved(ReservedSpace rs) {
174 set_reserved(rs.base(), rs.base() + rs.size(), rs.special());
175 }
177 inline void PSVirtualSpace::set_committed(char* low_addr, char* high_addr) {
178 _committed_low_addr = low_addr;
179 _committed_high_addr = high_addr;
180 }
182 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSVIRTUALSPACE_HPP