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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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