International Business Machines Corporation

David Henry Wilde

Maria Lorena Pesantez

Michael K Gschwind

Giles R Frazier

James Wilson Bishop

Dan Buerkle

A computer-implemented method for of constrained carries on speculative counters includes providing one or more speculative counters having an upper portion of most significant bits partially embedded in a random-access memory (RAM) array, and a pre-counter portion external to the RAM array having a plurality of least significant bits. The one or more speculative counters are configured to count a plurality of events of interest during a processor core instruction execution. A carry output from the pre-counter portion to the RAM array is suppressed for a duration of a speculative event period.

Constrained carries on speculative counters

A system includes memory and a hardware processor. The memory includes a load-monitored region register (LMRR) and a sampled data address register (SDAR). The hardware processor is configured to perform a garbage collection process that reclaims unused objects of the memory. The hardware processor further executes a performance monitoring process that provides information indicating a utilization of an instruction performed by the hardware processor. The SDAR is configured to store first data generated according to the garbage process and second data generated according to the performance monitoring process.

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Rowland Heights, CA, United States of America

David Henry Wilde