Memory management method and apparatus
A method for managing memory using a virtual memory manager includes receiving a memory allocation request, allocating memory of a physical address space in response to the memory allocation request, mapping an address value of the memory allocated in the physical address space to consecutive primary virtual address space, and mapping the address value of the primary virtual address space to one of a first and second secondary virtual address spaces to process a new memory allocation request in a situation where memory a fragmentation occurs. Other embodiments are also disclosed. The methods and apparatuses of the present disclosure are capable of moving active memory blocks of the fragmented virtual memory space to another virtual memory space to resolve the memory fragmentation even when a memory fragmentation occurs.
1. A memory management method of an electronic device, the method comprising:
receiving a memory allocation request for data;
allocating physical address space of a memory space to the data in response to the memory allocation request;
mapping address values of the memory allocated in the physical address space to a consecutive primary virtual address space; and
mapping the address values of the primary virtual address space to one of a first and second secondary virtual address spaces to process a next memory allocation request in a situation where a memory fragmentation occurs.
2. The method of claim 1 , wherein the physical address space, the primary virtual address space, the first secondary virtual space, and the second secondary virtual space are identical in size.
3. The method of claim 1 , further comprising:
moving, when the memory fragmentation occurs, active memory blocks of the one of the first and second secondary virtual address spaces, the one which is in use, to the other secondary virtual address space not in use currently.
4. The method of claim 3 , further comprising:
determining, when a consecutive memory size unallocated in the virtual address space used by a process is less than a memory size requested by the process, that the memory is fragmented.
5. The method of claim 3 , wherein moving the active memory blocks comprises:
changing the secondary virtual address without change of physical address and first virtual address corresponding to the active memory blocks.
6. The method of claim 3 , wherein moving the active memory blocks comprises:
checking whether an active memory block exists;
determining, when the active memory block exists, a new secondary virtual address necessary for moving the checks active memory block; and
mapping, when the new address is determined, the new virtual address to the primary virtual address of the corresponding memory block.
7. The method of claim 6 , wherein determining the new secondary virtual address comprises:
returning a least address value of memory unallocated in the secondary virtual address space to which the active memory block is moved; and
determining the address value of the address space corresponding to the returned address value as a new secondary virtual address value.
8. The method of claim 3 , further comprising:
allocating, when the next memory allocation request is received, a memory with a size requested in the next memory allocation request; and
determining whether the memory allocation request is an active memory block transfer request or the next memory allocation request.
9. The method of claim 8 , further comprising:
updating, when the memory allocation request is the active memory block transfer request, the secondary virtual address mapping information in the mapping table.
10. The method of claim 8 , further comprising:
adding, when the memory allocation request is the next memory allocation request, the mapping information on the physical address and the first and second virtual addresses corresponding to the new memory block, to the mapping table.
11. An electronic device having a memory, the electronic device comprising:
a memory unit configured to store at least one data; and
a controller configured to:
receive a memory allocation request for the data;
allocate a physical address space of a memory to the data in response to the memory allocation request;
map address values of the memory allocated in the physical address space to a consecutive primary virtual address space; and
map the address values of the primary virtual address space to one of a first and second secondary virtual address spaces to process a next memory allocation request in a situation where a memory fragmentation occurs.
12. The electronic device of claim 11 , wherein the primary virtual address space, the first secondary virtual space, and the second secondary virtual space are identical in size.
13. The electronic device of claim 12 , wherein the controller is configured to:
return a least address value of memory unallocated in the secondary virtual address space to which the active memory block is moved, and
determine the address value of the address space corresponding to the returned address value as a new secondary virtual address value.
14. The electronic device of claim 11 , wherein the controller is configured to move, when the memory fragmentation occurs, active memory blocks of the one of the first and second secondary virtual address spaces, the one which is in use, to the other secondary virtual address space not in use currently.
15. The electronic device of claim 14 , wherein the controller is configured to determine, when a consecutive memory size unallocated in the virtual address space used by a process is less than a memory size requested, that the memory is fragmented.
16. The electronic device of claim 14 , wherein the controller is configured to change the secondary virtual address without a change of physical addresses and first virtual address corresponding to the active memory blocks.
17. The electronic device of claim 14 , wherein the controller is configured to
check whether an active memory block exists,
determine, when any active memory block exists, a new secondary virtual address necessary for moving the active memory block, and
maps, when the new address is determined, the new virtual address to the primary virtual address of the corresponding memory block.
18. The electronic device of claim 14 , wherein the controller is configured to:
allocate, when a next memory allocation request is received, a memory with the size requested in receiving the new memory allocation request, and
determine whether the memory allocation request is an active memory block transfer request or new memory allocation request.
19. The electronic device of claim 14 , wherein the controller is configured to update, when the memory allocation request is the active memory block transfer request, the secondary virtual address mapping information in the mapping table.
20. The electronic device of claim 14 , wherein the controller is configured to add, when the memory allocation request is the new memory allocation request, the mapping information on the physical address and the first and second virtual addresses corresponding to the new memory block to the mapping table.