[openib-general] Re: RFC userspace CMA

[Sean Hefty]

Michael S. Tsirkin wrote:
> Sounds like a lot of work :).

I think that it's less work than the alternative.

> Are there benefits to this approach as opposed to implementing everything
> in a library on top of ucm/uverbs?

I considered, and continue to consider implementing on top of ucm.  The 
drawbacks are: it requires more kernel modules: one for the CM, one for SA 
query, and one for address translation.  It complicates the event model, since 
the uCMA must now deal with events from three different sources, rather than 
one.  And it duplicates a majority of the kernel CMA code in userspace.

- Sean