Method and apparatus for instruction execution hot spot detection and monitoring in a data processing unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 20, 2004
Grant Date -
N/A
app pub date -
Mar 8, 2000
filing date -
Dec 1, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method and apparatus for detecting and monitoring program hot spots during execution that may be implemented in hardware. A hot spot detector tracks branch instructions which are retired. Frequently executed branch instruction addresses within a particular interval are designated as hot spot candidates. A hot spot detection counter is used to track non-hot spot branches and hot spot candidate branches. When hot spot candidate branches are frequently encountered compared to non-hot spot candidate branches, the hot spot detector may notify the operating system and hot spot candidate branch addresses may be supplied to a runtime optimizing compiler and a monitor table or a hot spot monitor. The hot spot monitor may disable the hot spot detector when a program is operating in known hot spots and may enable the hot spot detector if the program has strayed from known hot spots.
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