[PATCH 0/3] mm/zswap & crypto/acompress: remove a couple of memcpy

Barry Song
2024-01-03T09:50:27Z

From: Barry Song <v-songbaohua@oppo.com>

The patchset removes a couple of memcpy in zswap and crypto
to improve zswap's performance.

Thanks for Chengming Zhou's test and perf data.
Quote from Chengming,
I just tested these three patches on my server, found improvement in the
kernel build testcase on a tmpfs with zswap (lz4 + zsmalloc) enabled.

mm-stable 501a06fe8e4c patched
real 1m38.028s 1m32.317s
user 19m11.482s 18m39.439s
sys 19m26.445s 17m5.646s

The patchset is based on mm-stable.

Barry Song (3):
crypto: introduce acomp_is_async to expose if a acomp has a scomp
backend
mm/zswap: remove the memcpy if acomp is not asynchronous
crypto: scompress: remove memcpy if sg_nents is 1

crypto/acompress.c | 8 ++++++++
crypto/scompress.c | 35 ++++++++++++++++++++++++++++-------
include/crypto/acompress.h | 9 +++++++++
mm/zswap.c | 6 ++++--
4 files changed, 49 insertions(+), 9 deletions(-)

--
2.34.1