28 #include "gc/g1/g1RegionToSpaceMapper.hpp"
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
39 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
40 size_t used_size,
41 size_t page_size,
42 size_t region_granularity,
43 size_t commit_factor,
44 MemoryType type) :
45 _listener(NULL),
46 _storage(rs, used_size, page_size),
47 _region_granularity(region_granularity),
48 _commit_map(rs.size() * commit_factor / region_granularity, mtGC) {
49 guarantee(is_power_of_2(page_size), "must be");
50 guarantee(is_power_of_2(region_granularity), "must be");
51
52 MemTracker::record_virtual_memory_type((address)rs.base(), type);
53 }
54
55 // G1RegionToSpaceMapper implementation where the region granularity is larger than
56 // or the same as the commit granularity.
57 // Basically, the space corresponding to one region region spans several OS pages.
58 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
59 private:
60 size_t _pages_per_region;
61
62 public:
63 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
64 size_t actual_size,
65 size_t page_size,
66 size_t alloc_granularity,
67 size_t commit_factor,
68 MemoryType type) :
69 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
70 _pages_per_region(alloc_granularity / (page_size * commit_factor)) {
71
72 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity");
73 }
74
75 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
76 const size_t start_page = (size_t)start_idx * _pages_per_region;
77 const size_t size_in_pages = num_regions * _pages_per_region;
78 bool zero_filled = _storage.commit(start_page, size_in_pages);
79 for (uint region_index = start_idx; region_index < start_idx + num_regions; region_index++ ) {
80 size_t page = region_index * _pages_per_region;
81 G1NUMA::numa()->request_memory_on_node(page, _pages_per_region, region_index);
82 }
83 if (AlwaysPreTouch) {
84 _storage.pretouch(start_page, size_in_pages, pretouch_gang);
85 }
86 _commit_map.set_range(start_idx, start_idx + num_regions);
87 fire_on_commit(start_idx, num_regions, zero_filled);
88 }
89
90 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
91 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region);
92 _commit_map.clear_range(start_idx, start_idx + num_regions);
93 }
94 };
95
96 // G1RegionToSpaceMapper implementation where the region granularity is smaller
97 // than the commit granularity.
98 // Basically, the contents of one OS page span several regions.
99 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
100 private:
101 class CommitRefcountArray : public G1BiasedMappedArray<uint> {
117 size_t page_size,
118 size_t alloc_granularity,
119 size_t commit_factor,
120 MemoryType type) :
121 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
122 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() {
123
124 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
125 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_up(rs.size(), page_size)), page_size);
126 }
127
128 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
129 size_t const NoPage = ~(size_t)0;
130
131 size_t first_committed = NoPage;
132 size_t num_committed = 0;
133
134 bool all_zero_filled = true;
135 G1NUMA* numa = G1NUMA::numa();
136
137 for (uint i = start_idx; i < start_idx + num_regions; i++) {
138 assert(!_commit_map.at(i), "Trying to commit storage at region %u that is already committed", i);
139 size_t idx = region_idx_to_page_idx(i);
140 uint old_refcount = _refcounts.get_by_index(idx);
141
142 bool zero_filled = false;
143 if (old_refcount == 0) {
144 if (first_committed == NoPage) {
145 first_committed = idx;
146 num_committed = 1;
147 } else {
148 num_committed++;
149 }
150 zero_filled = _storage.commit(idx, 1);
151 numa->request_memory_on_node(idx, 1, i);
152 }
153 all_zero_filled &= zero_filled;
154
155 _refcounts.set_by_index(idx, old_refcount + 1);
156 _commit_map.set_bit(i);
157 }
158 if (AlwaysPreTouch && num_committed > 0) {
159 _storage.pretouch(first_committed, num_committed, pretouch_gang);
160 }
161 fire_on_commit(start_idx, num_regions, all_zero_filled);
162 }
163
164 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
165 for (uint i = start_idx; i < start_idx + num_regions; i++) {
166 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i);
167 size_t idx = region_idx_to_page_idx(i);
168 uint old_refcount = _refcounts.get_by_index(idx);
169 assert(old_refcount > 0, "must be");
170 if (old_refcount == 1) {
171 _storage.uncommit(idx, 1);
172 }
173 _refcounts.set_by_index(idx, old_refcount - 1);
174 _commit_map.clear_bit(i);
175 }
176 }
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28 #include "gc/g1/g1RegionToSpaceMapper.hpp"
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
39 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
40 size_t used_size,
41 size_t page_size,
42 size_t region_granularity,
43 size_t commit_factor,
44 MemoryType type) :
45 _listener(NULL),
46 _storage(rs, used_size, page_size),
47 _region_granularity(region_granularity),
48 _commit_map(rs.size() * commit_factor / region_granularity, mtGC),
49 _memory_type(type) {
50 guarantee(is_power_of_2(page_size), "must be");
51 guarantee(is_power_of_2(region_granularity), "must be");
52
53 MemTracker::record_virtual_memory_type((address)rs.base(), type);
54 }
55
56 // G1RegionToSpaceMapper implementation where the region granularity is larger than
57 // or the same as the commit granularity.
58 // Basically, the space corresponding to one region region spans several OS pages.
59 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
60 private:
61 size_t _pages_per_region;
62
63 public:
64 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
65 size_t actual_size,
66 size_t page_size,
67 size_t alloc_granularity,
68 size_t commit_factor,
69 MemoryType type) :
70 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
71 _pages_per_region(alloc_granularity / (page_size * commit_factor)) {
72
73 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity");
74 }
75
76 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
77 const size_t start_page = (size_t)start_idx * _pages_per_region;
78 const size_t size_in_pages = num_regions * _pages_per_region;
79 bool zero_filled = _storage.commit(start_page, size_in_pages);
80 if (_memory_type == mtJavaHeap) {
81 for (uint region_index = start_idx; region_index < start_idx + num_regions; region_index++ ) {
82 void* address = _storage.page_start(region_index * _pages_per_region);
83 size_t size_in_bytes = _storage.page_size() * _pages_per_region;
84 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region_index);
85 }
86 }
87 if (AlwaysPreTouch) {
88 _storage.pretouch(start_page, size_in_pages, pretouch_gang);
89 }
90 _commit_map.set_range(start_idx, start_idx + num_regions);
91 fire_on_commit(start_idx, num_regions, zero_filled);
92 }
93
94 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
95 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region);
96 _commit_map.clear_range(start_idx, start_idx + num_regions);
97 }
98 };
99
100 // G1RegionToSpaceMapper implementation where the region granularity is smaller
101 // than the commit granularity.
102 // Basically, the contents of one OS page span several regions.
103 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
104 private:
105 class CommitRefcountArray : public G1BiasedMappedArray<uint> {
121 size_t page_size,
122 size_t alloc_granularity,
123 size_t commit_factor,
124 MemoryType type) :
125 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type),
126 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() {
127
128 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
129 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_up(rs.size(), page_size)), page_size);
130 }
131
132 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
133 size_t const NoPage = ~(size_t)0;
134
135 size_t first_committed = NoPage;
136 size_t num_committed = 0;
137
138 bool all_zero_filled = true;
139 G1NUMA* numa = G1NUMA::numa();
140
141 for (uint region_idx = start_idx; region_idx < start_idx + num_regions; region_idx++) {
142 assert(!_commit_map.at(region_idx), "Trying to commit storage at region %u that is already committed", region_idx);
143 size_t page_idx = region_idx_to_page_idx(region_idx);
144 uint old_refcount = _refcounts.get_by_index(page_idx);
145
146 bool zero_filled = false;
147 if (old_refcount == 0) {
148 if (first_committed == NoPage) {
149 first_committed = page_idx;
150 num_committed = 1;
151 } else {
152 num_committed++;
153 }
154 zero_filled = _storage.commit(page_idx, 1);
155 if (_memory_type == mtJavaHeap) {
156 void* address = _storage.page_start(page_idx);
157 size_t size_in_bytes = _storage.page_size();
158 numa->request_memory_on_node(address, size_in_bytes, region_idx);
159 }
160 }
161 all_zero_filled &= zero_filled;
162
163 _refcounts.set_by_index(page_idx, old_refcount + 1);
164 _commit_map.set_bit(region_idx);
165 }
166 if (AlwaysPreTouch && num_committed > 0) {
167 _storage.pretouch(first_committed, num_committed, pretouch_gang);
168 }
169 fire_on_commit(start_idx, num_regions, all_zero_filled);
170 }
171
172 virtual void uncommit_regions(uint start_idx, size_t num_regions) {
173 for (uint i = start_idx; i < start_idx + num_regions; i++) {
174 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i);
175 size_t idx = region_idx_to_page_idx(i);
176 uint old_refcount = _refcounts.get_by_index(idx);
177 assert(old_refcount > 0, "must be");
178 if (old_refcount == 1) {
179 _storage.uncommit(idx, 1);
180 }
181 _refcounts.set_by_index(idx, old_refcount - 1);
182 _commit_map.clear_bit(i);
183 }
184 }
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