26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
27 #include "oops/markOop.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "services/memTracker.hpp"
30 #ifdef TARGET_OS_FAMILY_linux
31 # include "os_linux.inline.hpp"
32 #endif
33 #ifdef TARGET_OS_FAMILY_solaris
34 # include "os_solaris.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_windows
37 # include "os_windows.inline.hpp"
38 #endif
39 #ifdef TARGET_OS_FAMILY_aix
40 # include "os_aix.inline.hpp"
41 #endif
42 #ifdef TARGET_OS_FAMILY_bsd
43 # include "os_bsd.inline.hpp"
44 #endif
45 #include "utilities/bitMap.inline.hpp"
46
47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
48 _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) {
49 }
50
51 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
52 if (!rs.is_reserved()) {
53 return false; // Allocation failed.
54 }
55 assert(_low_boundary == NULL, "VirtualSpace already initialized");
56 assert(page_size > 0, "Granularity must be non-zero.");
57
58 _low_boundary = rs.base();
59 _high_boundary = _low_boundary + rs.size();
60
61 _special = rs.special();
62 _executable = rs.executable();
63
64 _page_size = page_size;
65
66 assert(_committed.size() == 0, "virtual space initialized more than once");
67 uintx size_in_bits = rs.size() / page_size;
68 _committed.resize(size_in_bits, /* in_resource_area */ false);
69
70 return true;
71 }
72
73
74 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
75 release();
76 }
77
78 void G1PageBasedVirtualSpace::release() {
79 // This does not release memory it never reserved.
80 // Caller must release via rs.release();
81 _low_boundary = NULL;
82 _high_boundary = NULL;
83 _special = false;
84 _executable = false;
85 _page_size = 0;
86 _committed.resize(0, false);
87 }
88
89 size_t G1PageBasedVirtualSpace::committed_size() const {
90 return _committed.count_one_bits() * _page_size;
91 }
92
93 size_t G1PageBasedVirtualSpace::reserved_size() const {
94 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
95 }
96
97 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
98 return reserved_size() - committed_size();
99 }
100
101 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
102 return (addr - _low_boundary) / _page_size;
103 }
104
105 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
106 uintptr_t end = start + size_in_pages;
107 return _committed.get_next_zero_offset(start, end) >= end;
108 }
109
110 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
111 uintptr_t end = start + size_in_pages;
112 return _committed.get_next_one_offset(start, end) >= end;
113 }
114
115 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
116 return _low_boundary + index * _page_size;
117 }
118
119 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
120 return num * _page_size;
121 }
122
123 MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
124 // We need to make sure to commit all pages covered by the given area.
125 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
126
127 if (!_special) {
128 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
129 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
130 }
131 _committed.set_range(start, start + size_in_pages);
132
133 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
134 if (AlwaysPreTouch) {
135 os::pretouch_memory((char*)result.start(), (char*)result.end());
136 }
137 return result;
138 }
139
140 MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
141 guarantee(is_area_committed(start, size_in_pages), "checking");
142
143 if (!_special) {
144 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
145 }
146
147 _committed.clear_range(start, start + size_in_pages);
148
149 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
150 return result;
151 }
152
153 bool G1PageBasedVirtualSpace::contains(const void* p) const {
154 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
155 }
156
157 #ifndef PRODUCT
158 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
159 out->print ("Virtual space:");
160 if (special()) out->print(" (pinned in memory)");
161 out->cr();
162 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
163 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
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26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
27 #include "oops/markOop.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "services/memTracker.hpp"
30 #ifdef TARGET_OS_FAMILY_linux
31 # include "os_linux.inline.hpp"
32 #endif
33 #ifdef TARGET_OS_FAMILY_solaris
34 # include "os_solaris.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_windows
37 # include "os_windows.inline.hpp"
38 #endif
39 #ifdef TARGET_OS_FAMILY_aix
40 # include "os_aix.inline.hpp"
41 #endif
42 #ifdef TARGET_OS_FAMILY_bsd
43 # include "os_bsd.inline.hpp"
44 #endif
45 #include "utilities/bitMap.inline.hpp"
46 #include "utilities/copy.hpp"
47
48 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
49 _high_boundary(NULL), _committed(), _page_size(0), _special(false),
50 _needs_clear_on_commit(), _executable(false) {
51 }
52
53 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
54 if (!rs.is_reserved()) {
55 return false; // Allocation failed.
56 }
57 assert(_low_boundary == NULL, "VirtualSpace already initialized");
58 assert(page_size > 0, "Granularity must be non-zero.");
59
60 _low_boundary = rs.base();
61 _high_boundary = _low_boundary + rs.size();
62
63 _special = rs.special();
64 _executable = rs.executable();
65
66 _page_size = page_size;
67
68 assert(_committed.size() == 0, "virtual space initialized more than once");
69 uintx size_in_bits = rs.size() / page_size;
70 _committed.resize(size_in_bits, /* in_resource_area */ false);
71 if (_special) {
72 _needs_clear_on_commit.resize(size_in_bits, /* in_resource_area */ false);
73 }
74
75 return true;
76 }
77
78
79 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
80 release();
81 }
82
83 void G1PageBasedVirtualSpace::release() {
84 // This does not release memory it never reserved.
85 // Caller must release via rs.release();
86 _low_boundary = NULL;
87 _high_boundary = NULL;
88 _special = false;
89 _executable = false;
90 _page_size = 0;
91 _committed.resize(0, false);
92 _needs_clear_on_commit.resize(0, false);
93 }
94
95 size_t G1PageBasedVirtualSpace::committed_size() const {
96 return _committed.count_one_bits() * _page_size;
97 }
98
99 size_t G1PageBasedVirtualSpace::reserved_size() const {
100 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
101 }
102
103 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
104 return reserved_size() - committed_size();
105 }
106
107 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
108 return (addr - _low_boundary) / _page_size;
109 }
110
111 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
112 uintptr_t end = start + size_in_pages;
113 return _committed.get_next_zero_offset(start, end) >= end;
114 }
115
116 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
117 uintptr_t end = start + size_in_pages;
118 return _committed.get_next_one_offset(start, end) >= end;
119 }
120
121 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
122 return _low_boundary + index * _page_size;
123 }
124
125 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
126 return num * _page_size;
127 }
128
129 MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
130 // We need to make sure to commit all pages covered by the given area.
131 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
132
133 if (_special) {
134 // When the memory is _special it is not really uncommitted. _needs_clear_on_commit
135 // is used to communicate that the memory needs to be cleared because it is seen by
136 // others as uncommitted.
137 for (uintptr_t page_index = start; page_index < start + size_in_pages; page_index++) {
138 if (_needs_clear_on_commit.at(page_index)) {
139 Copy::zero_to_bytes((HeapWord*)page_start(page_index), _page_size);
140 _needs_clear_on_commit.clear_bit(page_index);
141 }
142 }
143 } else {
144 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
145 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
146 }
147 _committed.set_range(start, start + size_in_pages);
148
149 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
150 if (AlwaysPreTouch) {
151 os::pretouch_memory((char*)result.start(), (char*)result.end());
152 }
153 return result;
154 }
155
156 MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
157 guarantee(is_area_committed(start, size_in_pages), "checking");
158
159 if (_special) {
160 // Mark that memory needs to be cleared if committed again.
161 _needs_clear_on_commit.set_range(start, start + size_in_pages);
162 } else {
163 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
164 }
165
166 _committed.clear_range(start, start + size_in_pages);
167
168 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
169 return result;
170 }
171
172 bool G1PageBasedVirtualSpace::contains(const void* p) const {
173 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
174 }
175
176 #ifndef PRODUCT
177 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
178 out->print ("Virtual space:");
179 if (special()) out->print(" (pinned in memory)");
180 out->cr();
181 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
182 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
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