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A comment on PCID is now a critical performance/security feature on x86. Parent comment

Re:PCID is now a critical performance/security feature on x86 by raattgift on Monday January 08, 2018 @03:47AM (#16095486)
Yes to the latter, kinda to the former.

In reverse order:

This file goes back several OS versions:

https://github.com/apple/darwin-xnu/blob/master/osfmk/x86_64...

   sysctl machdep.cpu.features | grep PCID
(cf. xnu/osfmk/i386/cpuid.[hc], ibid.)
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