[PATCH v2 0/2] KSM: Replace jhash2 with xxhash
From: Timofey Titovets
Date: Fri Sep 22 2017 - 05:52:44 EST
(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.
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(-)