> Then, when you context switch it is likely the context to which you are switching would like to use that cache for something. By the time we switch to your or

> Then, when you context switch it is likely the context to which you are switching would like to use that cache for something. By the time we switch to your original thread it is very likely L1d has already been filled with something else. The other thread may have been doing work with memory on a GPU. The other thread may already have a hot cache at another layer. It's definitely not an edge case, or else the L1d cache would not have been designed to maintain state between context switches in the first place. There are going to be consequences to this.