[SRU][Xenial][PATCH 0/2] rfi-flush: Switch to new linear fallback flush (LP #1744173)

[Juerg Haefliger]

Ping. Can I get a second review, please?

On 05/30/2018 11:35 AM, Juerg Haefliger wrote:
> BugLink: https://bugs.launchpad.net/bugs/1744173
> 
> [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.
> 
> Signed-off-by: Juerg Haefliger <juergh at canonical.com>
> 
> 
> Michael Ellerman (1):
>   UBUNTU: SAUCE: rfi-flush: Make it possible to call setup_rfi_flush()
>     again
> 
> Nicholas Piggin (1):
>   powerpc/64s: Improve RFI L1-D cache flush fallback
> 
>  arch/powerpc/include/asm/paca.h      |  3 +-
>  arch/powerpc/kernel/asm-offsets.c    |  3 +-
>  arch/powerpc/kernel/exceptions-64s.S | 76 +++++++++++++---------------
>  arch/powerpc/kernel/setup_64.c       | 35 +++++++------
>  4 files changed, 57 insertions(+), 60 deletions(-)
> 


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