COW optimization on exec

[sidc7]

The Linux kernel uses the COW optimization for fork, so the processes share
the same pages, till on of the processes writes to the page. I was
wondering, if I do a fork and do an exec immediately following the fork,
will the COW optimization still be applied as it is most likely that the new
process is going to write to the shared pages? So doing a COW will not give
much benefit here, if it is done at all. Can anyone clarify if COW will be
applied in such a case, for e.g. a command shell.
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