3 Jun
2025
3 Jun
'25
1:14 p.m.
On 6/3/25 15:00, Christoph Hellwig wrote:
This is a really weird interface. No one has yet to explain why dmabuf is so special that we can't support direct I/O to it when we can support it to otherwise exotic mappings like PCI P2P ones.
With udmabuf you can do direct I/O, it's just inefficient to walk the page tables for it when you already have an array of all the folios.
Regards, Christian.