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:
Oct. 07, 2014
Filed:
Oct. 13, 2011
Lakshminarasimhan Sethumadhavan, New York, NY (US);
John D. Demme, New York, NY (US);
Lakshminarasimhan Sethumadhavan, New York, NY (US);
John D. Demme, New York, NY (US);
The Trustees of Columbia University in the City of New York, New York, NY (US);
Abstract
Method for providing precise microprocessor performance counter readings including detecting a swap back to a monitored process executing in a microprocessor. In response to the detected swap back to the monitored process, if the value read from the performance counter does not exceed the defined overflow threshold, the value of the performance counter stored in the first memory location is restored to the performance counter. If the value read from the performance counter exceeds the defined overflow threshold, the performance counter is set to zero and the value of the performance counter stored in the first memory location is used to increment an overflow memory location. If the value read from the performance counter exceeds the defined overflow threshold, at least one performance counter reading instruction is detected and in response to the detected at least one performance counter reading instruction, setting the counter output register to zero.