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dtrace return hook missing for some iokit funcs?

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dtrace return hook missing for some iokit funcs?

Subject: dtrace return hook missing for some iokit funcs?
From: Andrew Gallatin <email@hidden>
Date: Wed, 21 Apr 2010 17:08:29 -0400

I'm trying to figure out why createMappingInTas is failing, so I wrote a
simple dtrace script using self->follow=1 and dumping the args.
But I can't neatly terminate it, because there is a dtrace fbt
hook for _ZN18IOMemoryDescriptor19createMappingInTaskEP4taskymyy:entry
but not _ZN18IOMemoryDescriptor19createMappingInTaskEP4taskymyy:return
in 10.6.3

Eg: % sudo dtrace -l | grep MemoryDescriptor19createMappingInTask 3361 fbt mach_kernel _ZN18IOMemoryDescriptor19createMappingInTaskEP4taskymyy [IOMemoryDescriptor::createMappingInTask] entry %

Is this intentional?  Or just some optimization issue?

Thanks,

Drew
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