[Linaro-mm-sig] Memory Management Discussion

[Hans Verkuil]

> Thanks Jesse for initiating the mailing list.
>
> We need to address the requirements of Graphics and Multimedia
> Accelerators
> (IPs).
> What we really need is a permanent solution (at upstream) which
> accommodates
> the following requirements and conforms to Graphics and Multimedia use
> cases.
>
> 1.Mechanism to map/unmap the memory. Some of the IPs’ have the ability to
> address virtual memory and some can address only physically contiguous
> address space. We need to address both these cases.
> 2.Mechanism to allocate and release memory.
> 3.Method to share the memory (ZERO copy is a MUST for better performance)
> between different device drivers (example output of camera to multimedia
> encoder).
> 4.Method to share the memory with different processes in userspace. The
> sharing mechanism should include built-in security features.
>
> Are there any special requirements from V4L or DRM perspectives?

This thread lists most (I hope) of the requirements that V4L has:

http://www.mail-archive.com/linux-media@vger.kernel.org/msg29857.html

Regards,

        Hans

>
> Thanks,
> Sree
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