Michael S. Tsirkin wrote:
This approach still means that we have to allocate a potentially
huge amount of memory to copy all of the rmpp mad into kernel
in one go.
What I had in mind was: add a get_next_segment callback to mad,
which would copy the data (by copy_from_user) incrementally,
making forward progress without requiring us to have all of the mad
in kernel memory.
This may work. I think that there may be issues with respect to providing
proper synchronization and handling retries, but without looking at an
implementation, I can't be sure.
Is support for large RMPP transfers needed for kernel clients? If not, then we
may be able to implement this entirely in userspace, provided an option were
given to disable it in the kernel.
- Sean
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