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Date:   Wed, 6 Dec 2017 10:37:05 +0100
From:   Peter Zijlstra <>
To:     Dave Hansen <>
Cc:     the arch/x86 maintainers <>,
        Andy Lutomirski <>,
        LKML <>,
        Linux-MM <>,
        "Kleen, Andi" <>,
        "Chen, Tim C" <>,
        Linus Torvalds <>
Subject: Re: x86 TLB flushing: INVPCID vs. deferred CR3 write

On Tue, Dec 05, 2017 at 05:27:31PM -0800, Dave Hansen wrote:
> tl;dr: Kernels with pagetable isolation using INVPCID compile kernels
> 0.58% faster than using the deferred CR3 write.  This tends to say that
> we should leave things as-is and keep using INVPCID, but it's far from
> definitive.

Much appreciated, thanks Dave!

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