Re: [RFC] mmap(MAP_CONTIG)

On Tue, Oct 03 2017, Mike Kravetz wrote:

At Plumbers this year, Guy Shattah and Christoph Lameter gave a presentation
titled 'User space contiguous memory allocation for DMA' [1].  The slides
point out the performance benefits of devices that can take advantage of
larger physically contiguous areas.

Issue I have is that kind of memory needed may depend on a device.  Some
may require contiguous blocks.  Some may support scatter-gather.  Some
may be behind IO-MMU and not care either way.

Furthermore, I feel déjà vu.  Wasn’t dmabuf supposed to address this
issue?

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»