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Subject[Q] Question about memory access

I am highly curious about memory access problem.

Maybe this is not exactly 'kernel' development problem, but I think this is

related to 'kernel'.

Anyway my question is below.

If someone want to transfer large data from some device to memory, he may
use DMA method.

At this point, i am confused.

I think that only one process can access physical memory(RAM) at a time.

During DMA data transferring(This may need long time), how can other
physical memory access occurs?

I think that this is solved by time-sharing, process switching, or etc. Is
it true?

Please say abstract mechanism or kernel code location about this problem.

My english is poor, so question meaning may be confused. I am sorry about

Please answer my question. Thanks!

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