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This directory contains some example programs which illustrate how the Linux x86 performance-monitoring counters interface may be used.

global/

        Shows how to set up and monitor global-mode perfctrs.
        Fully developed, this would be a perfctr analogue
        of the `top' or `ps' command.

perfex/

        perfex runs another program with user-specified performance
        counter settings, and outputs the final counter values when
        that program terminates.
        perfex is an incomplete clone of IRIX' perfex(1) for MIPS R10000.

self/

        Shows how a program can use the perfctrs to
        monitor the execution in parts of its own code.

signal/

        Illustrates how performance counter overflow can be caught
        and sent to the process as a user-specified signal.