Double-mapping memory is almost always the wrong choice, since TLB entries are a critical resource for software performance. The only time it makes sense to dou

Double-mapping memory is almost always the wrong choice, since TLB entries are a critical resource for software performance. The only time it makes sense to double-map is when your are trying to make the CPU blind to what you are sharing, as seen in some high-performance ring buffer implementations. But this is double-black-diamond stuff, not something that has wide applicability.