Modified buddy system for managing storage space

Details Modified buddy system for managing storage space Modified buddy system for managing storage space

1995-10-13

1998-01-27

Heckler, Thomas M.

39549701, G06F 1202

Patent

active

057130027

ABSTRACT:
A modified buddy system is adopted for managing disk space in a disk storage. The modified buddy system uses a minimal amount of memory space and provides very quick access to extents within the disk space. The modified buddy system utilizes a tree structure of nodes, wherein each node represents an extent of disk space. A bitmap is provided for holding state bits for each of the nodes in the tree structure. The bitmap is organized to preserve locality of reference.

REFERENCES:
patent: 4536837 (1985-08-01), Olson et al.
patent: 5247634 (1993-09-01), Cline et al.
Knuth, "The Art of Computer Programming," Second Edition, vol. 1, Fundamental Algorithms; 1973; pp. 442-445.
Koch, Philip D.L., "Disk File Allocation Based on the Buddy System," ACM Transactions on Computer Systems, vol. 5, No. 4, Nov. 1987; pp. 352-370.
Leffler, Samual J. et al., "The Design and Implementation of the 4.3BSD UNIX Operating System," Addison-Wesley Publishing Company; Chapter 7; 1989; pp. 187-223.

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