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

[Barry Song]

From: Barry Song <v-songbaohua@xxxxxxxx>

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