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Groups > linux.kernel > #1305084
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC 00/13] x86/mm: PCID and INVPCID |
| Date | 2016-01-09 00:40 +0100 |
| Message-ID | <qOONs-5sr-5@gated-at.bofh.it> (permalink) |
| References | <qOOu6-5ka-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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[RFC 00/13] x86/mm: PCID and INVPCID Andy Lutomirski <luto@kernel.org> - 2016-01-09 00:20 +0100
Re: [RFC 00/13] x86/mm: PCID and INVPCID Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-09 00:40 +0100
Re: [RFC 00/13] x86/mm: PCID and INVPCID Andy Lutomirski <luto@amacapital.net> - 2016-01-09 00:40 +0100
Re: [RFC 00/13] x86/mm: PCID and INVPCID Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-09 00:50 +0100
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