The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1993
Filed:
Jul. 24, 1992
Robert E Galbraith, Rochester, MN (US);
Steven G Glassen, Wallkill, NY (US);
Assaf Marron, Poughkeepsie, NY (US);
Kenneth J Oakes, Wappingers Falls, NY (US);
David E Stucki, Poughkeepsie, NY (US);
Leslie W Wyman, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Provides a method for measuring the busy utilization time for I/O channel used by any of plural operating systems (OSs) in a CEC. The measured utilization time for any OS excludes the time shared channels are utilized by other OSs during a measurement period. A channel measurement facility (CMF) is provided in the I/O subsystem hardware and microcode for each of the OSs in the I/O subsystem. The CMF is logically constructed because it uses only a small portion of I/O resources already existing in a CEC by adding microcode to control these resources to perform the time measurement function. The resources for a logical CMF including the partial use of: an I/O processor to store identifiers of an assigned OS, the partial use of channel processors controlling channels selected by the assigned OS during a measurement period, the local storage of each I/O processor, and OS storage needed for communicating the measurement data from the CMF to the OS. Any CPU can control a measurement by issuing 'set channel measurement' instructions for starting and stopping a measurement performed asynchronously by the CMF to release the CPU for other independent CPU operations during a measurement period. The instruction can also be used to test the status of any CMF.