[SRU][Zesty][powerpc][PATCH 0/4] Fixes for LP:1709220

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1709220

== SRU Justification ==
These four commits are Radix performance patches specific to powerpc.  

The patches are reported to help anywhere from 40% up to 3.5X on unixbench fork/exec testcases.

The first patch was included in mainlne as of 4.12-rc1.  The last three patches are
still in linux-next.

== Fixes ==
commit a5998fcb92552a18713b6aa5c146aa400e4d75ee
Author: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
Date:   Wed Apr 26 21:38:17 2017 +1000

    powerpc/mm/radix: Optimise tlbiel flush all case

linux-next commit 5ce5fe14ed0302315061cf97ce67accd1b25b938
Author: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date:   Wed Jul 19 14:49:04 2017 +1000

    powerpc/mm/radix: Improve _tlbiel_pid to be usable for PWC flushes

linux-next commit a46cc7a90fd8d95bfbb2b27080efe872a1a51db4
Author: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date:   Wed Jul 19 14:49:05 2017 +1000

    powerpc/mm/radix: Improve TLB/PWC flushes

linux-next commit 424de9c6e3f89399fc11afc1f53f89c5329132da
Author: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date:   Wed Jul 19 14:49:06 2017 +1000

    powerpc/mm/radix: Avoid flushing the PWC on every flush_tlb_range



== Regression Potential ==
Low since changes are specific to powerpc.

== Test Case ==
A test kernel was built with these patches and tested by the original bug reporter.

Aneesh Kumar K.V (1):
  powerpc/mm/radix: Optimise tlbiel flush all case

Benjamin Herrenschmidt (3):
  powerpc/mm/radix: Improve _tlbiel_pid to be usable for PWC flushes
  powerpc/mm/radix: Improve TLB/PWC flushes
  powerpc/mm/radix: Avoid flushing the PWC on every flush_tlb_range

 .../powerpc/include/asm/book3s/64/tlbflush-radix.h |   5 +-
 arch/powerpc/mm/pgtable-radix.c                    |   5 +-
 arch/powerpc/mm/tlb-radix.c                        | 124 +++++++++++++--------
 3 files changed, 85 insertions(+), 49 deletions(-)

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