> (Skylake) is the first to have the PCID feature PCID was introduced with Westmere (2010). [1] However it wasn't used in the Linux kernel until 4.14 because

> (Skylake) is the first to have the PCID feature PCID was introduced with Westmere (2010). [1] However it wasn't used in the Linux kernel until 4.14 because no one saw the need. [2] [1] https://www.realworldtech.com/westmere/ https://www.realworldtech.com/westmere/ [2] https://stackoverflow.com/questions/20155304/does-linux-use-x86-cpus-pcid-feature-for-tlb-if-not-why https://stackoverflow.com/questions/20155304/does-linux-use-...