Michael> Roland, could you please clarify what does the page_size
    Michael> field in struct ib_mem do?

It gives the page size for the user memory described by the struct.
The idea was that if/when someone tries to optimize for huge pages,
then the low-level driver can know that a region is using huge pages
without having to walk through the page list and search for the
minimum physically contiguous size.

 - R.

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