[PATCH v4 0/3] mm/zswap & crypto/compress: remove a couple of memcpy

[Barry Song <21cnbao@gmail.com>]

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


This patchset applies to mm-unstable as recently zswap has
lots of change.

-v4:
  * introduce a helper for algorithm flags according to Herbert
  * fix cra_flags for intel and hisilicon async drivers

Barry Song (3):
  crypto: introduce crypto_acomp_get_alg_flags to expose algorithm flags
  mm/zswap: remove the memcpy if acomp is not sleepable
  crypto: scompress: remove memcpy if sg_nents is 1

 crypto/scompress.c                         | 36 +++++++++++++++++-----
 drivers/crypto/hisilicon/zip/zip_crypto.c  |  1 +
 drivers/crypto/intel/iaa/iaa_crypto_main.c |  1 +
 include/crypto/acompress.h                 |  5 +++
 include/linux/crypto.h                     |  5 +++
 mm/zswap.c                                 |  7 +++--
 6 files changed, 46 insertions(+), 9 deletions(-)

-- 
2.34.1