Invention Grant
US08438415B2 Performing a perform timing facility function instruction for synchronizing TOD clocks
有权
执行用于同步TOD时钟的执行定时设备功能指令
- Patent Title: Performing a perform timing facility function instruction for synchronizing TOD clocks
- Patent Title (中): 执行用于同步TOD时钟的执行定时设备功能指令
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Application No.: US13402554Application Date: 2012-02-22
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Publication No.: US08438415B2Publication Date: 2013-05-07
- Inventor: Eberhard Engler , Mark S. Farrell , Klaus Meissner , Ronald M. Smith, Sr. , Mark A. Check
- Applicant: Eberhard Engler , Mark S. Farrell , Klaus Meissner , Mark A. Check , Evangelyn K. Smith
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Agent John E. Campbell
- Main IPC: G06F1/04
- IPC: G06F1/04 ; G04C11/00

Abstract:
A system, method and computer program product for steering a time-of-day (TOD) clock for a computer system having a physical clock providing a time base for executing operations that is stepped to a common oscillator. The method includes receiving, at a processing unit, a request to change a clock steering rate used to control a TOD-clock offset value for the processing unit, the TOD-clock offset defined as a function of a start time (s), a base offset (b), and a steering rate (r). The unit schedules a next episode start time with which to update the TOD-clock offset value. After updating TOD-clock offset value (d) at the scheduled time, TOD-clock offset value is added to a physical-clock value (Tr) value to obtain a logical TOD-clock value (Tb), where the logical TOD-clock value is adjustable without adjusting a stepping rate of the oscillator.
Public/Granted literature
- US20120173917A1 PERFORMING A PERFORM TIMING FACILITY FUNCTION INSTRUCTION FOR SYNCHRONIZING TOD CLOCKS Public/Granted day:2012-07-05
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