Hello. On 07/11/2015 11:25 PM, David Daney wrote:
From: David Daney <david.da...@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.da...@cavium.com>
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