Re: [RFC: DMA_PMD 00/22] DMA_PMD: PMD_SIZE-backed IO buffer pools

[Christoph Hellwig]

On Fri, Oct 23, 2026 at 11:50:23AM -0300, Jason Gunthorpe wrote:
> > Disk I/O is still potentially affected by the same problems
> > (cost if io mapping/unmapping, iotlb thrashing, bounce buffers
> > in confidential computing...)
> 
> The disk folks already have a proposal to address all of this using
> io_uring and preallocated buffers. I really doubt yet another version
> is going to be interesting there.

Huh?  If you mean the dma-buf I/O it doesn't really have anything
to do with disks, except that this is the first user.  The dma-buf
iovec can work for every ->read_iter/->write_iter consumer, and
should be adopted more broadly.  Including by networking instead of
their own totally weird different world.