96 return region / _regions_per_page; 97 } 98 99 public: 100 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, 101 size_t actual_size, 102 size_t page_size, 103 size_t alloc_granularity, 104 size_t commit_factor, 105 MemoryType type) : 106 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), 107 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { 108 109 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); 110 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_size_up(rs.size(), page_size)), page_size); 111 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); 112 } 113 114 virtual void commit_regions(uint start_idx, size_t num_regions) { 115 for (uint i = start_idx; i < start_idx + num_regions; i++) { 116 assert(!_commit_map.at(i), err_msg("Trying to commit storage at region %u that is already committed", i)); 117 size_t idx = region_idx_to_page_idx(i); 118 uint old_refcount = _refcounts.get_by_index(idx); 119 bool zero_filled = false; 120 if (old_refcount == 0) { 121 zero_filled = _storage.commit(idx, 1); 122 } 123 _refcounts.set_by_index(idx, old_refcount + 1); 124 _commit_map.set_bit(i); 125 fire_on_commit(i, 1, zero_filled); 126 } 127 } 128 129 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 130 for (uint i = start_idx; i < start_idx + num_regions; i++) { 131 assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region %u that is not committed", i)); 132 size_t idx = region_idx_to_page_idx(i); 133 uint old_refcount = _refcounts.get_by_index(idx); 134 assert(old_refcount > 0, "must be"); 135 if (old_refcount == 1) { 136 _storage.uncommit(idx, 1); 137 } 138 _refcounts.set_by_index(idx, old_refcount - 1); 139 _commit_map.clear_bit(i); 140 } 141 } 142 }; 143 144 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) { 145 if (_listener != NULL) { 146 _listener->on_commit(start_idx, num_regions, zero_filled); 147 } 148 } 149 150 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs, 151 size_t actual_size, | 96 return region / _regions_per_page; 97 } 98 99 public: 100 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, 101 size_t actual_size, 102 size_t page_size, 103 size_t alloc_granularity, 104 size_t commit_factor, 105 MemoryType type) : 106 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), 107 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { 108 109 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); 110 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_size_up(rs.size(), page_size)), page_size); 111 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); 112 } 113 114 virtual void commit_regions(uint start_idx, size_t num_regions) { 115 for (uint i = start_idx; i < start_idx + num_regions; i++) { 116 assert(!_commit_map.at(i), "Trying to commit storage at region %u that is already committed", i); 117 size_t idx = region_idx_to_page_idx(i); 118 uint old_refcount = _refcounts.get_by_index(idx); 119 bool zero_filled = false; 120 if (old_refcount == 0) { 121 zero_filled = _storage.commit(idx, 1); 122 } 123 _refcounts.set_by_index(idx, old_refcount + 1); 124 _commit_map.set_bit(i); 125 fire_on_commit(i, 1, zero_filled); 126 } 127 } 128 129 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 130 for (uint i = start_idx; i < start_idx + num_regions; i++) { 131 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i); 132 size_t idx = region_idx_to_page_idx(i); 133 uint old_refcount = _refcounts.get_by_index(idx); 134 assert(old_refcount > 0, "must be"); 135 if (old_refcount == 1) { 136 _storage.uncommit(idx, 1); 137 } 138 _refcounts.set_by_index(idx, old_refcount - 1); 139 _commit_map.clear_bit(i); 140 } 141 } 142 }; 143 144 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) { 145 if (_listener != NULL) { 146 _listener->on_commit(start_idx, num_regions, zero_filled); 147 } 148 } 149 150 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs, 151 size_t actual_size, |