>> GM: gm_register_memory will be able to lock XXX pages (YYY MBytes)
> Is there a way to tell GM to pull more memory from the system?
GM reserves all IOMMU space that the OS is willing to give it, so what is
needed is a way to tell the OS and/or machine to allow a bigger chunk of
IOMMU space to be grabbed by GM. Note that IOMMU space is not the same as
the amount of memory a process can used, it is the amount of DMA-able memory
that a driver can have "registered" at any one time. MPI then has to manage
this space much like a VMM has to manage physical memory vs. page space.