29 #include "logging/log.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/virtualspace.hpp"
32 #include "runtime/java.hpp"
33 #include "runtime/os.inline.hpp"
34 #include "services/memTracker.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/bitMap.inline.hpp"
37 #include "utilities/formatBuffer.hpp"
38 #include "utilities/powerOfTwo.hpp"
39
40 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
41 size_t used_size,
42 size_t page_size,
43 size_t region_granularity,
44 size_t commit_factor,
45 MemoryType type) :
46 _listener(NULL),
47 _storage(rs, used_size, page_size),
48 _region_granularity(region_granularity),
49 _commit_map(rs.size() * commit_factor / region_granularity, mtGC),
50 _memory_type(type) {
51 guarantee(is_power_of_2(page_size), "must be");
52 guarantee(is_power_of_2(region_granularity), "must be");
53
54 MemTracker::record_virtual_memory_type((address)rs.base(), type);
55 }
56
57 // G1RegionToSpaceMapper implementation where the region granularity is larger than
58 // or the same as the commit granularity.
59 // Basically, the space corresponding to one region region spans several OS pages.
60 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
61 private:
62 size_t _pages_per_region;
63
64 public:
65 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
66 size_t actual_size,
67 size_t page_size,
68 size_t alloc_granularity,
69 size_t commit_factor,
71 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
72 _pages_per_region(alloc_granularity / (page_size * commit_factor)) {
73
74 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity");
75 }
76
77 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
78 const size_t start_page = (size_t)start_idx * _pages_per_region;
79 const size_t size_in_pages = num_regions * _pages_per_region;
80 bool zero_filled = _storage.commit(start_page, size_in_pages);
81 if (_memory_type == mtJavaHeap) {
82 for (uint region_index = start_idx; region_index < start_idx + num_regions; region_index++ ) {
83 void* address = _storage.page_start(region_index * _pages_per_region);
84 size_t size_in_bytes = _storage.page_size() * _pages_per_region;
85 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region_index);
86 }
87 }
88 if (AlwaysPreTouch) {
89 _storage.pretouch(start_page, size_in_pages, pretouch_gang);
90 }
91 _commit_map.set_range(start_idx, start_idx + num_regions);
92 fire_on_commit(start_idx, num_regions, zero_filled);
93 }
94
95 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
96 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region);
97 _commit_map.clear_range(start_idx, start_idx + num_regions);
98 }
99 };
100
101 // G1RegionToSpaceMapper implementation where the region granularity is smaller
102 // than the commit granularity.
103 // Basically, the contents of one OS page span several regions.
104 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
105 private:
106 class CommitRefcountArray : public G1BiasedMappedArray<uint> {
107 protected:
108 virtual uint default_value() const { return 0; }
109 };
110
111 size_t _regions_per_page;
112
113 CommitRefcountArray _refcounts;
114
115 uintptr_t region_idx_to_page_idx(uint region) const {
116 return region / _regions_per_page;
117 }
118
119 public:
120 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
121 size_t actual_size,
122 size_t page_size,
123 size_t alloc_granularity,
124 size_t commit_factor,
125 MemoryType type) :
126 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
127 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() {
128
129 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
130 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_up(rs.size(), page_size)), page_size);
131 }
132
133 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
134 size_t const NoPage = ~(size_t)0;
135
136 size_t first_committed = NoPage;
137 size_t num_committed = 0;
138
139 bool all_zero_filled = true;
140 G1NUMA* numa = G1NUMA::numa();
141
142 for (uint region_idx = start_idx; region_idx < start_idx + num_regions; region_idx++) {
143 assert(!_commit_map.at(region_idx), "Trying to commit storage at region %u that is already committed", region_idx);
144 size_t page_idx = region_idx_to_page_idx(region_idx);
145 uint old_refcount = _refcounts.get_by_index(page_idx);
146
147 bool zero_filled = false;
148 if (old_refcount == 0) {
149 if (first_committed == NoPage) {
150 first_committed = page_idx;
151 num_committed = 1;
152 } else {
153 num_committed++;
154 }
155 zero_filled = _storage.commit(page_idx, 1);
156 if (_memory_type == mtJavaHeap) {
157 void* address = _storage.page_start(page_idx);
158 size_t size_in_bytes = _storage.page_size();
159 numa->request_memory_on_node(address, size_in_bytes, region_idx);
160 }
161 }
162 all_zero_filled &= zero_filled;
163
164 _refcounts.set_by_index(page_idx, old_refcount + 1);
165 _commit_map.set_bit(region_idx);
166 }
167 if (AlwaysPreTouch && num_committed > 0) {
168 _storage.pretouch(first_committed, num_committed, pretouch_gang);
169 }
170 fire_on_commit(start_idx, num_regions, all_zero_filled);
171 }
172
173 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
174 for (uint i = start_idx; i < start_idx + num_regions; i++) {
175 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i);
176 size_t idx = region_idx_to_page_idx(i);
177 uint old_refcount = _refcounts.get_by_index(idx);
178 assert(old_refcount > 0, "must be");
179 if (old_refcount == 1) {
180 _storage.uncommit(idx, 1);
181 }
182 _refcounts.set_by_index(idx, old_refcount - 1);
183 _commit_map.clear_bit(i);
184 }
185 }
186 };
187
188 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
189 if (_listener != NULL) {
190 _listener->on_commit(start_idx, num_regions, zero_filled);
191 }
192 }
193
194 static bool map_nvdimm_space(ReservedSpace rs) {
195 assert(AllocateOldGenAt != NULL, "");
196 int _backing_fd = os::create_file_for_heap(AllocateOldGenAt);
197 if (_backing_fd == -1) {
198 log_error(gc, init)("Could not create file for Old generation at location %s", AllocateOldGenAt);
199 return false;
200 }
201 // commit this memory in nv-dimm
202 char* ret = os::attempt_reserve_memory_at(rs.size(), rs.base(), _backing_fd);
203
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29 #include "logging/log.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/virtualspace.hpp"
32 #include "runtime/java.hpp"
33 #include "runtime/os.inline.hpp"
34 #include "services/memTracker.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/bitMap.inline.hpp"
37 #include "utilities/formatBuffer.hpp"
38 #include "utilities/powerOfTwo.hpp"
39
40 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
41 size_t used_size,
42 size_t page_size,
43 size_t region_granularity,
44 size_t commit_factor,
45 MemoryType type) :
46 _listener(NULL),
47 _storage(rs, used_size, page_size),
48 _region_granularity(region_granularity),
49 _region_commit_map(rs.size() * commit_factor / region_granularity, mtGC),
50 _memory_type(type) {
51 guarantee(is_power_of_2(page_size), "must be");
52 guarantee(is_power_of_2(region_granularity), "must be");
53
54 MemTracker::record_virtual_memory_type((address)rs.base(), type);
55 }
56
57 // G1RegionToSpaceMapper implementation where the region granularity is larger than
58 // or the same as the commit granularity.
59 // Basically, the space corresponding to one region region spans several OS pages.
60 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
61 private:
62 size_t _pages_per_region;
63
64 public:
65 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
66 size_t actual_size,
67 size_t page_size,
68 size_t alloc_granularity,
69 size_t commit_factor,
71 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
72 _pages_per_region(alloc_granularity / (page_size * commit_factor)) {
73
74 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity");
75 }
76
77 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
78 const size_t start_page = (size_t)start_idx * _pages_per_region;
79 const size_t size_in_pages = num_regions * _pages_per_region;
80 bool zero_filled = _storage.commit(start_page, size_in_pages);
81 if (_memory_type == mtJavaHeap) {
82 for (uint region_index = start_idx; region_index < start_idx + num_regions; region_index++ ) {
83 void* address = _storage.page_start(region_index * _pages_per_region);
84 size_t size_in_bytes = _storage.page_size() * _pages_per_region;
85 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region_index);
86 }
87 }
88 if (AlwaysPreTouch) {
89 _storage.pretouch(start_page, size_in_pages, pretouch_gang);
90 }
91 _region_commit_map.set_range(start_idx, start_idx + num_regions);
92 fire_on_commit(start_idx, num_regions, zero_filled);
93 }
94
95 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
96 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region);
97 _region_commit_map.clear_range(start_idx, start_idx + num_regions);
98 }
99 };
100
101 // G1RegionToSpaceMapper implementation where the region granularity is smaller
102 // than the commit granularity.
103 // Basically, the contents of one OS page span several regions.
104 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
105 size_t _regions_per_page;
106
107 size_t region_idx_to_page_idx(uint region_idx) const {
108 return region_idx / _regions_per_page;
109 }
110
111 bool is_page_committed(size_t page_idx) {
112 size_t region = page_idx * _regions_per_page;
113 size_t region_limit = region + _regions_per_page;
114 // Committed if there is a bit set in the range.
115 return _region_commit_map.get_next_one_offset(region, region_limit) != region_limit;
116 }
117
118 void numa_request_on_node(size_t page_idx) {
119 if (_memory_type == mtJavaHeap) {
120 uint region = (uint)(page_idx * _regions_per_page);
121 void* address = _storage.page_start(page_idx);
122 size_t size_in_bytes = _storage.page_size();
123 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region);
124 }
125 }
126
127 public:
128 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
129 size_t actual_size,
130 size_t page_size,
131 size_t alloc_granularity,
132 size_t commit_factor,
133 MemoryType type) :
134 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
135 _regions_per_page((page_size * commit_factor) / alloc_granularity) {
136
137 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
138 }
139
140 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
141 assert(num_regions > 0, "Must commit at least one region");
142 assert(_region_commit_map.get_next_one_offset(start_idx, start_idx + num_regions) == start_idx + num_regions,
143 "Should be no committed regions in the range [%u, " SIZE_FORMAT ")",
144 start_idx, start_idx + num_regions);
145
146 size_t const NoPage = ~(size_t)0;
147
148 size_t first_committed = NoPage;
149 size_t num_committed = 0;
150
151 size_t start_page = region_idx_to_page_idx(start_idx);
152 size_t end_page = region_idx_to_page_idx((uint)(start_idx + num_regions - 1));
153
154 bool all_zero_filled = true;
155 for (size_t page = start_page; page <= end_page; page++) {
156 if (!is_page_committed(page)) {
157 // Page not committed.
158 if (num_committed == 0) {
159 first_committed = page;
160 }
161 num_committed++;
162
163 if (!_storage.commit(page, 1)) {
164 // Found dirty region during commit.
165 all_zero_filled = false;
166 }
167
168 // Move memory to correct NUMA node for the heap.
169 numa_request_on_node(page);
170 } else {
171 // Page already committed.
172 all_zero_filled = false;
173 }
174 }
175
176 // Update the commit map for the given range.
177 _region_commit_map.set_range(start_idx, start_idx + num_regions);
178
179 if (AlwaysPreTouch && num_committed > 0) {
180 _storage.pretouch(first_committed, num_committed, pretouch_gang);
181 }
182
183 fire_on_commit(start_idx, num_regions, all_zero_filled);
184 }
185
186 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
187 assert(num_regions > 0, "Must uncommit at least one region");
188 assert(_region_commit_map.get_next_zero_offset(start_idx, start_idx + num_regions) == start_idx + num_regions,
189 "Should only be committed regions in the range [%u, " SIZE_FORMAT ")",
190 start_idx, start_idx + num_regions);
191
192 size_t start_page = region_idx_to_page_idx(start_idx);
193 size_t end_page = region_idx_to_page_idx((uint)(start_idx + num_regions - 1));
194
195 // Clear commit map for the given range.
196 _region_commit_map.clear_range(start_idx, start_idx + num_regions);
197
198 for (size_t page = start_page; page <= end_page; page++) {
199 // We know all pages were committed before clearing the map. If the
200 // the page is still marked as committed after the clear we should
201 // not uncommit it.
202 if (!is_page_committed(page)) {
203 _storage.uncommit(page, 1);
204 }
205 }
206 }
207 };
208
209 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
210 if (_listener != NULL) {
211 _listener->on_commit(start_idx, num_regions, zero_filled);
212 }
213 }
214
215 static bool map_nvdimm_space(ReservedSpace rs) {
216 assert(AllocateOldGenAt != NULL, "");
217 int _backing_fd = os::create_file_for_heap(AllocateOldGenAt);
218 if (_backing_fd == -1) {
219 log_error(gc, init)("Could not create file for Old generation at location %s", AllocateOldGenAt);
220 return false;
221 }
222 // commit this memory in nv-dimm
223 char* ret = os::attempt_reserve_memory_at(rs.size(), rs.base(), _backing_fd);
224
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