[lkml]   [2015]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 3/3] arm64, mm: Use IPIs for TLB invalidation.

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

> From: David Daney <>

> 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 <>

WBR, Sergei

 \ /
  Last update: 2015-07-12 00:21    [W:0.068 / U:0.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site