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*Profiling* ([[!wikipedia Profiling_(computer_programming) desc="Wikipedia
article"]]) is a tool for tracing where CPU time is spent.  This is usually
done for [[performance analysis|performance]] reasons.

  * [[gprof]]

    Should be working, but some issues have been reported, regarding GCC spec
    files.  Should be possible to fix (if not yet done) easily.

  * [[community/gsoc/project_ideas/dtrace]]

    Have a look at this, integrate it into the main trees.

  * [[LTTng]]

  * [[SystemTap]]

  * ... or some other Linux thing.