Wouldn't this mean that you need to memcpy around? Maybe async-io (io_uring?) help here by doing zero-copy writes directly from the source. I don't know how muc

Wouldn't this mean that you need to memcpy around? Maybe async-io (io_uring?) help here by doing zero-copy writes directly from the source. I don't know how much you need to mangle code (GOT/PLT, offsets) and how much it is a straight copy of object to object.