| Date | Fri, 8 Jan 2016 15:31:03 -0800 | Subject | Re: [RFC 00/13] x86/mm: PCID and INVPCID | From | Linus Torvalds <> |
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On Fri, Jan 8, 2016 at 3:15 PM, Andy Lutomirski <luto@kernel.org> wrote: > > Please play around and suggest (and run?) good benchmarks. It seems > to save around 100ns on cross-process context switches for me.
Interesting. There was reportedly (I never saw it) a test-patch to use pcids inside of Intel a couple of years ago, and it never got outside because it didn't make a difference.
Either things have changed (newer hardware with more pcids perhaps?) or you did a better job at it.
Linus
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