[PATCH v2 0/2] KSM: Replace jhash2 with xxhash

[Timofey Titovets]

(Resend, added cc kvm@xxxxxxxxxxxxxxx)

ksm use jhash2 for hashing pages,
in 4.14 xxhash has been merged to mainline kernel.

xxhash much faster then jhash2 on big inputs (32 byte+)

xxhash has 2 versions, one with 32-bit hash and
one with 64-bit hash.

64-bit version works faster then 32-bit on 64-bit arch.

So lets get better from two worlds,
create arch dependent xxhash() function that will use
fastest algo for current arch.
This a first patch.

Performance info and ksm update can be found in second patch.

Changelog:
  v1 -> v2:
    - Move xxhash() to xxhash.h/c and separate patches

Timofey Titovets (2):
  xxHash: create arch dependent 32/64-bit xxhash()
  KSM: Replace jhash2 with xxhash

 include/linux/xxhash.h | 24 ++++++++++++++++++++++++
 lib/xxhash.c           | 10 ++++++++++
 mm/Kconfig             |  1 +
 mm/ksm.c               | 14 +++++++-------
 4 files changed, 42 insertions(+), 7 deletions(-)

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2.14.1