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

[David Hildenbrand (Arm)]

On 10/3/26 23:22, Luigi Rizzo wrote:
> Here is a subsystem called DMA_PMD on which I would like feedback on
> architecture, possible enhancements, or kernel components that could be
> reused to avoid duplication.

Here is a feedback to a subsystem called DMA_PMD ;)

Why is basing this on PMDs (and embedding it in the name) the right approach?

On architctures with large PMDs (512 MiB on arm64 with 64k), would we really
want to use 512 MiB pages, or rather something smaller (e.g., 2 MiB) that might
possibly also have TLB benefits (cont-pte)?

-- 
Cheers,

David