Managing read requests from multiple requestors

Details Managing read requests from multiple requestors Managing read requests from multiple requestors

2005-02-28

2009-08-18

Tsai, Henry W. H. (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output command process

C711S162000

Reexamination Certificate

active

07577763

ABSTRACT:
Techniques are described herein for expanding the range of data targeted in I/O requests made by clients, so that the expanded range results in aligned I/O operations within the file system. Data that is included in the expanded range, but was not actually requested by the client, is trimmed off the data chunk returned by the file system, so that the client receives only the data required by the client. The blocks that contain the partially-read data are cached, so that they can be provided to the clients in response to subsequent I/O requests, without having to retrieve the blocks again from the file system. The I/O requests of multiple clients are handled by a read scheduler that uses a single global queue for all such requests. When appropriate, the read scheduler creates companionship relationships between the requests, and services the “companion” requests based on the data returned for the requests with which the companion requests are associated.

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Marshall Kirk McKusick et al., A Fast File System for UNIX, Feb. 18, 2004, University of California, Berkeley, 1-14.

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