I don't know who started the trend. I personally first heard about the term from Mike Acton's CppCon 2004 talk. But as pointed out by another comment, I don't

I don't know who started the trend. I personally first heard about the term from Mike Acton's CppCon 2004 talk. But as pointed out by another comment, I don't think it's that mainstream. Outside HPC and game development. At least that's what came up when you google the relevant terms like cache, locality, etc.