On Mon, Jan 23, 2023 at 11:36:51AM -0800, Dan Williams wrote: > Jason Gunthorpe via Lsf-pc wrote: > > I would like to have a session at LSF to talk about Matthew's > > physr discussion starter: > > > > https://lore.kernel.org/linux-mm/YdyKWeU0HTv8m7wD@xxxxxxxxxxxxxxxxxxxx/ > > > > I have become interested in this with some immediacy because of > > IOMMUFD and this other discussion with Christoph: > > > > https://lore.kernel.org/kvm/4-v2-472615b3877e+28f7-vfio_dma_buf_jgg@xxxxxxxxxx/ > > I think this is a worthwhile discussion. My main hangup with 'struct > page' elimination in general is that if anything needs to be allocated You're the first one to bring up struct page elimination. Neither Jason nor I have that as our motivation. But there are reasons why struct page is a bad data structure, and Xen proves that you don't need to have such a data structure in order to do I/O. > When I read "general interest across all the driver subsystems" it is > hard not to ask "have all possible avenues to enable 'struct page' been > exhausted?" Yes, we should definitely expend yet more resources chasing a poor implementation.
