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Extended Input/Output Measurement Word Facility, and Emulation of that Facility

  • US 20080103755A1
  • Filed: 12/28/2007
  • Published: 05/01/2008
  • Est. Priority Date: 05/12/2003
  • Status: Active Grant
First Claim
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1. A method of obtaining measurement data for a single I/O operation, the method comprising the steps of:

  • indicating to a channel subsystem that an Extended I/O Measurement Word Facility is enabled;

    storing measurement data associated with the single I/O operation in a subchannel of the channel subsystem;

    signaling the completion of the single I/O operation;

    executing a test subchannel instruction in response to detecting the signaling of completion of the I/O interruption, the test subchannel instruction designating the subchannel and an address of an I/O Response block, the execution comprising placing the measurement data associated with the single I/O operation in the Extended Measurement Word (EMW) associated with the I/O Response Block (IRB) based on a determination that the Extended I/O Measurement Word Facility is enabled.

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