[PATCH 05/18] dma: Provide an interface to allow allocate IOVA

[Leon Romanovsky]

On Mon, Oct 28, 2024 at 09:54:49AM +0530, Srinivasulu Thanneeru wrote:
> On Sun, Oct 27, 2024 at 10:23 PM Leon Romanovsky <leon at kernel.org> wrote:
> >
> > From: Leon Romanovsky <leonro at nvidia.com>
> >
> > The existing .map_page() callback provides both allocating of IOVA
> > and linking DMA pages. That combination works great for most of the
> > callers who use it in control paths, but is less effective in fast
> > paths where there may be multiple calls to map_page().
> 
> Can you please share perf stats with this patch in fast path, if available?

I don't have this data for HMM and VFIO as they have other benefits from this
series except performance. For NVMe, I don't have the data yet, but it will
come https://lore.kernel.org/all/cover.1730037261.git.leon@kernel.org/,
as it is the main performant user of this API.

This is the main reason why NVMe series is marked as RFC yet.

Thanks