Would it be possible for the vmcp kernel driver to have an option to pre-allocate some fixed size of contiguous memory and hold onto it? This would prevent fragmentation which can hit you at any time. I remember using vmcp from a Linux based installer which typically started by downloading large files over scp. Somehow scp caused a lot of fragmentation which made fragmentation errors very likely. If you have an application that runs a large number of vmcp commands, then failed vmcp due to fragmentation means the end, because AFAIK there is no sure way how to defragment, other than wait an unspecified amount of time.
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