On Fri, Jun 07, 2024 at 08:27:29AM -0600, David Ahern wrote: > On 6/7/24 7:42 AM, Pavel Begunkov wrote: > > I haven't seen any arguments against from the (net) maintainers so > > far. Nor I see any objection against callbacks from them (considering > > that either option adds an if). > > I have said before I do not understand why the dmabuf paradigm is not > sufficient for both device memory and host memory. A less than ideal > control path to put hostmem in a dmabuf wrapper vs extra checks and > changes in the datapath. The former should always be preferred. I think Pavel explained this - his project is principally to replace the lifetime policy of pages in the data plane. He wants to change when a page is considered available for re-allocation because userspace may continue to use the page after the netstack thinks it is done with it. It sounds like having a different source of the pages is the less important part. IMHO it seems to compose poorly if you can only use the io_uring lifecycle model with io_uring registered memory, and not with DMABUF memory registered through Mina's mechanism. Jason
