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    SubjectRe: [patch 55/60] x86/mm: Use INVPCID for __native_flush_tlb_single()
    On Mon, Dec 4, 2017 at 6:08 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
    > From: Dave Hansen <dave.hansen@linux.intel.com>
    >
    > This uses INVPCID to shoot down individual lines of the user mapping
    > instead of marking the entire user map as invalid. This
    > could/might/possibly be faster.
    >
    > This for sure needs tlb_single_page_flush_ceiling to be redetermined;
    > esp. since INVPCID is _slow_.

    I'm wondering if INVPCID is *so* slow that this patch is entirely
    counterproductive.

    --Andy

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