** Summary changed:

- artful: rfi-flush: Switch to new linear fallback flush
+ rfi-flush: Switch to new linear fallback flush

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https://bugs.launchpad.net/bugs/1744173

Title:
  rfi-flush: Switch to new linear fallback flush

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Artful:
  In Progress

Bug description:
  [Impact]
  Change flush from congruence-first with dependencies to linear with
  no dependencies, which increases flush performance by 8x on P8, and
  3x on P9 (as measured with null syscall loop, which will have the
  flush area in the L2).

  The flush also becomes simpler and more adaptable to different cache
  geometries.

  [Test Case]
  TBD.

  [Regression Potential]
  The risk is deemed low since the changes are confined to POWER only and the 
provided test kernels have been tested by IBM.

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