Does mmap make a memory copy?

["prodyuth" <prodyuth@indiatimes.com>]

Hi all,
I would be very thankful if anyone confirms my understanding of mmap.

I am using mmap to attach a device buffer into the process virtual address space. My understanding is that there will not be a kernel copy of the device buffer.
So writing into the process address space is like writing into the device buffer directly without a memory copy.

Am I correct in my understanding.

Thanks in advance for your help.
Regards,
Prodyut.




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