16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "utilities/globalDefinitions.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace {
33 friend class VMStructs;
34 protected:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 int _fd_for_heap;
41 private:
42 bool _executable;
43
44 // ReservedSpace
45 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
46 bool executable);
47 protected:
48 void initialize(size_t size, size_t alignment, bool large,
49 char* requested_address,
50 bool executable);
51
52 public:
53 // Constructor
54 ReservedSpace();
55 // Initialize the reserved space with the given size. If preferred_page_size
56 // is set, use this as minimum page size/alignment. This may waste some space
57 // if the given size is not aligned to that value, as the reservation will be
58 // aligned up to the final alignment in this case.
59 ReservedSpace(size_t size, size_t preferred_page_size = 0);
60 ReservedSpace(size_t size, size_t alignment, bool large,
61 char* requested_address = NULL);
62 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
63
64 // Accessors
65 char* base() const { return _base; }
66 size_t size() const { return _size; }
67 char* end() const { return _base + _size; }
68 size_t alignment() const { return _alignment; }
69 bool special() const { return _special; }
70 bool executable() const { return _executable; }
71 size_t noaccess_prefix() const { return _noaccess_prefix; }
72 bool is_reserved() const { return _base != NULL; }
73 void release();
74
75 // Splitting
76 ReservedSpace first_part(size_t partition_size, size_t alignment,
77 bool split = false, bool realloc = true);
78 ReservedSpace last_part (size_t partition_size, size_t alignment);
79
80 // These simply call the above using the default alignment.
81 inline ReservedSpace first_part(size_t partition_size,
82 bool split = false, bool realloc = true);
83 inline ReservedSpace last_part (size_t partition_size);
84
85 // Alignment
86 static size_t page_align_size_up(size_t size);
97 {
98 return first_part(partition_size, alignment(), split, realloc);
99 }
100
101 ReservedSpace ReservedSpace::last_part(size_t partition_size)
102 {
103 return last_part(partition_size, alignment());
104 }
105
106 // Class encapsulating behavior specific of memory space reserved for Java heap.
107 class ReservedHeapSpace : public ReservedSpace {
108 private:
109 void try_reserve_heap(size_t size, size_t alignment, bool large,
110 char *requested_address);
111 void try_reserve_range(char *highest_start, char *lowest_start,
112 size_t attach_point_alignment, char *aligned_HBMA,
113 char *upper_bound, size_t size, size_t alignment, bool large);
114 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
115 // Create protection page at the beginning of the space.
116 void establish_noaccess_prefix();
117 public:
118 // Constructor. Tries to find a heap that is good for compressed oops.
119 // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated
120 // on the device which is managed by the file system where the directory resides.
121 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL);
122 // Returns the base to be used for compression, i.e. so that null can be
123 // encoded safely and implicit null checks can work.
124 char *compressed_oop_base() { return _base - _noaccess_prefix; }
125 };
126
127 // Class encapsulating behavior specific memory space for Code
128 class ReservedCodeSpace : public ReservedSpace {
129 public:
130 // Constructor
131 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
132 };
133
134 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
135
136 class VirtualSpace {
|
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "utilities/globalDefinitions.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace {
33 friend class VMStructs;
34 protected:
35 char* _base;
36 char* _nvdimm_base;
37 char* _nvdimm_base_nv;
38 size_t _size;
39 size_t _dram_size;
40 size_t _nvdimm_size;
41 size_t _noaccess_prefix;
42 size_t _alignment;
43 bool _special;
44 int _fd_for_heap;
45 int _fd_for_nvdimm;
46 private:
47 bool _executable;
48
49 // ReservedSpace
50 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
51 bool executable);
52 protected:
53 void initialize(size_t size, size_t alignment, bool large,
54 char* requested_address,
55 bool executable);
56
57 public:
58 // Constructor
59 ReservedSpace();
60 // Initialize the reserved space with the given size. If preferred_page_size
61 // is set, use this as minimum page size/alignment. This may waste some space
62 // if the given size is not aligned to that value, as the reservation will be
63 // aligned up to the final alignment in this case.
64 ReservedSpace(size_t size, size_t preferred_page_size = 0);
65 ReservedSpace(size_t size, size_t alignment, bool large,
66 char* requested_address = NULL);
67 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
68
69 // Accessors
70 char* base() const { return _base; }
71 char* nvdimm_base() const { return _nvdimm_base; }
72 int nvdimm_fd() const { return _fd_for_nvdimm; }
73 void setup_fd(int fd) {_fd_for_nvdimm = fd; }
74 size_t size() const { return _size; }
75 size_t nvdimm_size() const { return _nvdimm_size; }
76 char* end() const { return _base + _size; }
77 size_t alignment() const { return _alignment; }
78 bool special() const { return _special; }
79 bool executable() const { return _executable; }
80 size_t noaccess_prefix() const { return _noaccess_prefix; }
81 bool is_reserved() const { return _base != NULL; }
82 void release();
83
84 // Splitting
85 ReservedSpace first_part(size_t partition_size, size_t alignment,
86 bool split = false, bool realloc = true);
87 ReservedSpace last_part (size_t partition_size, size_t alignment);
88
89 // These simply call the above using the default alignment.
90 inline ReservedSpace first_part(size_t partition_size,
91 bool split = false, bool realloc = true);
92 inline ReservedSpace last_part (size_t partition_size);
93
94 // Alignment
95 static size_t page_align_size_up(size_t size);
106 {
107 return first_part(partition_size, alignment(), split, realloc);
108 }
109
110 ReservedSpace ReservedSpace::last_part(size_t partition_size)
111 {
112 return last_part(partition_size, alignment());
113 }
114
115 // Class encapsulating behavior specific of memory space reserved for Java heap.
116 class ReservedHeapSpace : public ReservedSpace {
117 private:
118 void try_reserve_heap(size_t size, size_t alignment, bool large,
119 char *requested_address);
120 void try_reserve_range(char *highest_start, char *lowest_start,
121 size_t attach_point_alignment, char *aligned_HBMA,
122 char *upper_bound, size_t size, size_t alignment, bool large);
123 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
124 // Create protection page at the beginning of the space.
125 void establish_noaccess_prefix();
126 void initialize_g1gc_nvdimm_dram_sizes(size_t size, size_t alignment);
127 public:
128 // Constructor. Tries to find a heap that is good for compressed oops.
129 // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated
130 // on the device which is managed by the file system where the directory resides.
131 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL);
132 // Returns the base to be used for compression, i.e. so that null can be
133 // encoded safely and implicit null checks can work.
134 char *compressed_oop_base() { return _base - _noaccess_prefix; }
135 };
136
137 // Class encapsulating behavior specific memory space for Code
138 class ReservedCodeSpace : public ReservedSpace {
139 public:
140 // Constructor
141 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
142 };
143
144 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
145
146 class VirtualSpace {
|