Is mmap fast enough?

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Hi

In Bt848, it seems that mmap is pointing to memory address of pc.
Is it correct?
It seems that the memory is in the kernel space. 
If i want to do some process with that memory, it takes 
many resource to change mode ( kernel <-> user ).
So the solution is the dma transfer to user space in v4l2..?
 
Thanks in advance for your comment.
 




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