Memory sharing issue by application on V4L2 based device driver with system mmu.
jonghun.han at samsung.com
Thu Jan 13 03:39:24 EST 2011
Sorry for late reply.
Samsung SoC C210 has many multimedia IPs.
Each IP has its own MMU named SYSTEM MMU like CPU's MMU.
So it can handle discontiguous memory using device own virtual address.
What Inki Dae wants to discuss is how to allocate the memory and how to
share it with other multimedia IPs.
Thank you for interesting.
> -----Original Message-----
> From: linux-fbdev-owner at vger.kernel.org [mailto:linux-fbdev-
> owner at vger.kernel.org] On Behalf Of Konrad Rzeszutek Wilk
> Sent: Wednesday, January 12, 2011 2:35 AM
> To: Jonghun Han
> Cc: 'InKi Dae'; linux-media at vger.kernel.org;
linux-arm-kernel at lists.infradead.org;
> 'linux-fbdev'; kyungmin.park at samsung.com
> Subject: Re: Memory sharing issue by application on V4L2 based device
> with system mmu.
> .. snip..
> > But 64KB or 1MB physically contiguous memory is better than 4KB page
> > in the point of performance.
> Could you explain that in more details please? I presume you are talking
> CPU that has a MMU unit, right?
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