Method and apparatus for establishing a bound on the effect...

Details Method and apparatus for establishing a bound on the effect... Method and apparatus for establishing a bound on the effect...

2008-04-01

2008-04-01

An, Meng-Al T. (Department: 2195)

Electrical computers and digital processing systems: virtual mac

Task management or control

C718S102000, C711S125000

Reexamination Certificate

active

07353513

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.

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Mendelson et al, “Modeling Live and Dead Lines in Cache Memory System,” IEEE, Trans. on Computers, v. 42, No. 1, (Jan. 1993).

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