This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verification-needed-xenial' to 'verification-failed-
xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
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** Tags added: verification-needed-xenial

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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:
  Fix Committed
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed

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

  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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