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:
Apr. 01, 2008
Filed:
Feb. 20, 2002
Michael Richard Betker, Allentown, PA (US);
Harry Dwyer, Annandale, NJ (US);
John Susantha Fernando, Coopersburg, PA (US);
Michael Richard Betker, Allentown, PA (US);
Harry Dwyer, Annandale, NJ (US);
John Susantha Fernando, Coopersburg, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A method and apparatus are disclosed for establishing a bound on the effect of task interference in an instruction cache shared by multiple tasks. The bound established by the present invention is the maximum number of 'live' frames of a given task that are coexistent during the execution of an application. A 'live cache frame' contains a block that is accessed in the future without an intervening eviction. The eviction of blocks from a live frame by an interrupt causes a future miss that would not otherwise occur and evictions from live frames are the only evictions that cause misses that would not otherwise occur. The invention provides a more accurate estimate of the maximum addition time of a task that results from servicing an interrupt during its execution. Additional accuracy is obtained by exploiting knowledge of the character of an intervening task to achieve a tighter bound, when possible.