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    SubjectRe: [PATCH 3/3] arm64, mm: Use IPIs for TLB invalidation.
    Hello.

    On 07/11/2015 11:25 PM, David Daney wrote:

    > From: David Daney <david.daney@cavium.com>

    > Most broadcast TLB invalidations are unnecessary. So when
    > invalidating for a given mm/vma target the only the needed CPUs via

    The only the needed?

    > and IPI.

    > For global TLB invalidations, also use IPI.

    > Tested on Cavium ThunderX.

    > This change reduces 'time make -j48' on kernel from 139s to 116s (83%
    > as long).

    > The patch is needed because of a ThunderX Pass1 erratum: Exclusive
    > store operations unreliable in the presence of broadcast TLB
    > invalidations. The performance improvements shown make it compelling
    > even without the erratum workaround need.

    > Signed-off-by: David Daney <david.daney@cavium.com>

    WBR, Sergei



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