I feel the cache in these modern CPUs is being used extremely efficiently. If they have a branch predictor that is 99% accurate, I have faith in letting the same engineers manage my cache eviction strategy. The extreme scope of modern OoO execution strategies would probably make detailed CPU cache management more of a liability than an asset.

One simple policy would be to try to ensure your application is as small as reasonably possible. If you can fit your entire executable image in a fraction of your L3 you are probably sitting in a really good spot.