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

Message ID 20240103095006.608744-1-21cnbao@gmail.com
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Series mm/zswap & crypto/acompress: remove a couple of memcpy | expand

Message

Barry Song Jan. 3, 2024, 9:50 a.m. UTC 
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(-)