Ognyan Kulev <[EMAIL PROTECTED]> writes:

> This is new to me.  I always thought that vm_map/vm_unmap is expensive.

It is a system call.  But it is nothing as expensive as a disk read.
It is worth avoiding unnecessary calls to vm_map; it is the same as
vm_allocate.  It is entirely harmless to augment a disk access with a
vm_map call.




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