Re: [PATCH 19/31] powerpc/mm: Convert 4k hash insert to C

Benjamin Herrenschmidt [off-list ref] writes:

On Mon, 2015-09-21 at 12:10 +0530, Aneesh Kumar K.V wrote:

quoted

Signed-off-by: Aneesh Kumar K.V <redacted>
---
 arch/powerpc/mm/Makefile        |   3 +
 arch/powerpc/mm/hash64_64k.c    | 204 +++++++++++++++++++++
 arch/powerpc/mm/hash_low_64.S   | 380 ------------------------------
----------
 arch/powerpc/mm/hash_utils_64.c |   4 +-
 4 files changed, 210 insertions(+), 381 deletions(-)
 create mode 100644 arch/powerpc/mm/hash64_64k.c

Did you check if there was any measurable performance difference ?

Not with this patch series. I did look at the .s file generated between
__hash_page_4k and hash64_4k.c and found them similar. 

I will also try some micro benchmarks w.r.t hash insert/update and will
update later with numbers.

-aneesh