[PATCH 3/3] arm64, mm: Use IPIs for TLB invalidation.
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>
More information about the linux-arm-kernel