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
|
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 // At least one bit must be set if the page is committed.
114 return _region_commit_map.count_one_bits(region, region + _regions_per_page) > 0;
115 }
116
117 void numa_request_on_node(size_t page_idx) {
118 if (_memory_type == mtJavaHeap) {
119 uint region = (uint)(page_idx * _regions_per_page);
120 void* address = _storage.page_start(page_idx);
121 size_t size_in_bytes = _storage.page_size();
122 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region);
123 }
124 }
125
126 public:
127 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
128 size_t actual_size,
129 size_t page_size,
130 size_t alloc_granularity,
131 size_t commit_factor,
132 MemoryType type) :
133 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
134 _regions_per_page((page_size * commit_factor) / alloc_granularity) {
135
136 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
137 }
138
139 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
140 assert(_region_commit_map.count_one_bits(start_idx, start_idx + num_regions) == 0,
141 "Should be no commited regions in the range [%u, " SIZE_FORMAT ")",
142 start_idx, start_idx + num_regions);
143
144 size_t const NoPage = ~(size_t)0;
145
146 size_t first_committed = NoPage;
147 size_t num_committed = 0;
148
149 size_t start_page = region_idx_to_page_idx(start_idx);
150 size_t end_page = region_idx_to_page_idx((uint)(start_idx + num_regions - 1));
151
152 bool all_zero_filled = true;
153 for (size_t page = start_page; page <= end_page; page++) {
154 if (!is_page_committed(page)) {
155 // Page not committed.
156 if (num_committed == 0) {
157 first_committed = page;
158 }
159 num_committed++;
160
161 if (!_storage.commit(page, 1)) {
162 // Found dirty region during commit.
163 all_zero_filled = false;
164 }
165
166 // Move memory to correct NUMA node for the heap.
167 numa_request_on_node(page);
168 } else {
169 // Page already committed.
170 all_zero_filled = false;
171 }
172 }
173
174 // Update the commit map for the given range.
175 _region_commit_map.set_range(start_idx, start_idx + num_regions);
176
177 if (AlwaysPreTouch && num_committed > 0) {
178 _storage.pretouch(first_committed, num_committed, pretouch_gang);
179 }
180
181 fire_on_commit(start_idx, num_regions, all_zero_filled);
182 }
183
184 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
185 assert(_region_commit_map.count_one_bits(start_idx, start_idx + num_regions) == num_regions,
186 "Should only be commited regions in the range [%u, " SIZE_FORMAT ")",
187 start_idx, start_idx + num_regions);
188
189 size_t start_page = region_idx_to_page_idx(start_idx);
190 size_t end_page = region_idx_to_page_idx((uint)(start_idx + num_regions - 1));
191
192 // Clear commit map for the given range.
193 _region_commit_map.clear_range(start_idx, start_idx + num_regions);
194
195 for (size_t page = start_page; page <= end_page; page++) {
196 // We know all pages were committed before clearing the map. If the
197 // the page is still marked as committed after the clear we should
198 // not uncommit it.
199 if (!is_page_committed(page)) {
200 _storage.uncommit(page, 1);
201 }
202 }
203 }
204 };
205
206 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
207 if (_listener != NULL) {
208 _listener->on_commit(start_idx, num_regions, zero_filled);
209 }
210 }
211
212 static bool map_nvdimm_space(ReservedSpace rs) {
213 assert(AllocateOldGenAt != NULL, "");
214 int _backing_fd = os::create_file_for_heap(AllocateOldGenAt);
215 if (_backing_fd == -1) {
216 log_error(gc, init)("Could not create file for Old generation at location %s", AllocateOldGenAt);
217 return false;
218 }
219 // commit this memory in nv-dimm
220 char* ret = os::attempt_reserve_memory_at(rs.size(), rs.base(), _backing_fd);
221
|