Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using PCID

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From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using PCID
Date	Mon, 03 Jul 2017 13:00:01 +0200
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On Thu, 29 Jun 2017, Andy Lutomirski wrote:
> ping-pong between two mms on the same CPU using eventfd:
>   patched:         1.22µs
>   patched, nopcid: 1.33µs
>   unpatched:       1.34µs
> 
> Same ping-pong, but now touch 512 pages (all zero-page to minimize
> cache misses) each iteration.  dTLB misses are measured by
> dtlb_load_misses.miss_causes_a_walk:
>   patched:         1.8µs  11M  dTLB misses
>   patched, nopcid: 6.2µs, 207M dTLB misses
>   unpatched:       6.1µs, 190M dTLB misses
> 
> Reviewed-by: Nadav Amit <nadav.amit@gmail.com>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

Thread

[PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using PCID Andy Lutomirski <luto@kernel.org> - 2017-06-29 18:00 +0200
  Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using  PCID Thomas Gleixner <tglx@linutronix.de> - 2017-07-03 13:00 +0200
  Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using  PCID Peter Zijlstra <peterz@infradead.org> - 2017-07-05 14:20 +0200
    Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using PCID Andy Lutomirski <luto@kernel.org> - 2017-07-05 18:10 +0200
      Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using  PCID Peter Zijlstra <peterz@infradead.org> - 2017-07-05 19:10 +0200
        Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using  PCID Ingo Molnar <mingo@kernel.org> - 2017-07-18 11:00 +0200
  Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using  PCID Peter Zijlstra <peterz@infradead.org> - 2017-07-05 14:30 +0200
    Re: [PATCH v4 10/10] x86/mm: Try to preserve old TLB entries using PCID Andy Lutomirski <luto@kernel.org> - 2017-07-05 18:20 +0200

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