[ncmncm]

That is a very good idea.

You don't even need to double-map memory. Just make the ring buffer smaller than your actual buffer, and treat any overrun as if it had wrapped around, but really just write past the (official) end. You might waste a bit of space at the front when you do, just to keep the code simple, but if you didn't have some room to waste, you wouldn't be using a ring buffer.

Another way to simplify management is to give the ring buffer a power-of-two size, and make the head and tail counters 64 bits, masking off the high bits when actually looking at the buffer. They only ever increase.