Messages in this thread | | | Date | Sun, 12 Jul 2015 01:06:27 +0300 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 3/3] arm64, mm: Use IPIs for TLB invalidation. |
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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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