Re: [ANN] Request for Topics and registration for a Media Summit September 16th

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

Em Wed, 12 Jun 2024 11:34:30 +0300
Laurent Pinchart <laurent.pinchart@ideasonboard.com> escreveu:

> Focussing on this topic, if we're brainstorming memory management for
> media devices, I'd like to throw in a controversial idea. In addition to
> being clearer on the fact that USERPTR is deprecated, I would like to
> deprecate MMAP too and only focus on DMABUF. I believe Linux needs a
> centralized buffer allocator, instead of having multiple allocation APIs
> scattered in different places. There are design ideas in gralloc that we
> could benefit from.

Deprecating USERPTR is doable, as not many apps use it, and they're
mostly focused on complex camera/ARM scenario. Now, deprecating MMAP at 
V4L2 core is a different history: lots of different userspace programs,
including browsers and proprietary apps like zoom, etc. rely on MMAP
support. We can only consider deprecating MMAP once applications switch 
to DMABUF.

Thanks,
Mauro