Mapped file input/output with delayed zeroing

Details Mapped file input/output with delayed zeroing Mapped file input/output with delayed zeroing

1995-04-24

1999-07-06

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711118, 395186, 395651, G06F 1214

Patent

active

059208953

ABSTRACT:
The efficiency of writing files that are cached using mapped file I/O is improved by suppressing zeroing of uninitialized data in cached pages of a file until the file is mapped by a user mode thread. In an operating system where paging operations are controlled by a virtual memory manager and memory based caching using mapped file I/O is administered by a cache manager, suppressing zeroing of mapped files on writes is implemented by a set of internal operating system interfaces for communications between the virtual memory manager and the cache manager. When a file being cached is not yet mapped by a user mode thread, the cache manager tracks the extent to which a cache page of the file is written so that any uninitialized data in the cache page can later be zeroed when the file is mapped by a user mode thread.

REFERENCES:
patent: 4942606 (1990-07-01), Kaiser et al.
patent: 5353410 (1994-10-01), Macon, Jr. et al.
patent: 5375243 (1994-12-01), Parzych et al.
Curt Schimmel "UNIX Systems for Modern Architectures Symmetric Multiprocessing and Caching for Kernel Programmers", Addison-Wesley Publishing Co., 1994, pp. 139-140, 1994.
Andrew S. Tanenbaum, "Modern Operating Systems", 1992, Prentice Hall, Inc., pp. 18-26 and pp. 180-202.
Inside the Windows NT File System, Helen Custer, Microsoft Press, 1994.
Inside Windows NT, Chapters Two, Six and Eight, Helen Custer, Microsoft Press, 1993.

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