Written by J. Moellenkamp
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Perl 5.10.1 with dtrace support

Looks like Perl will have integrated dtrace support soon. The Install file of the Release Candidate 1 for Perl 5.10.1 states:

On platforms where DTrace is available, it may be enabled by using the -Dusedtrace option to Configure. DTrace probes are available for subroutine entry (sub-entry) and subroutine exit (sub-exit). Here's a simple D script that uses them: