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

Sergei Shtylyov sergei.shtylyov at cogentembedded.com
Sat Jul 11 15:06:27 PDT 2015


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

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

WBR, Sergei

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