Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory

Benjamin Herrenschmidt
2017-04-19T01:23:04Z

On Tue, 2017-04-18 at 16:24 -0600, Jason Gunthorpe wrote:
> Basically, all this list processing is a huge overhead compared to
> just putting a helper call in the existing sg iteration loop of the
> actual op.  Particularly if the actual op is a no-op like no-mmu x86
> would use.

Yes, I'm leaning toward that approach too.

The helper itself could hang off the devmap though.

> Since dma mapping is a performance path we must be careful not to
> create intrinsic inefficiencies with otherwise nice layering :)
>
> Jason
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