[PATCH v5 0/4] zram: implement deduplication in zram

[js1304]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

Changes from v4
o rebase on next-20170511
o collect Reviewed-by from Sergey

Changes from v3
o fix module build problem
o make zram_dedup_enabled() statically return false if CONFIG_ZRAM_DEDUP=n

Changes from v2
o rebase to latest zram code
o manage alloc/free of the zram_entry in zram_drv.c
o remove useless RB_CLEAR_NODE
o set RO permission tor use_deup sysfs entry if CONFIG_ZRAM_DEDUP=n

Changes from v1
o reogranize dedup specific functions
o support Kconfig on/off
o update zram documents
o compare all the entries with same checksum (patch #4)

This patchset implements deduplication feature in zram. Motivation
is to save memory usage by zram. There are detailed description
about motivation and experimental results on patch #2 so please
refer it.

Thanks.

Joonsoo Kim (4):
  zram: introduce zram_entry to prepare dedup functionality
  zram: implement deduplication in zram
  zram: make deduplication feature optional
  zram: compare all the entries with same checksum for deduplication

 Documentation/ABI/testing/sysfs-block-zram |  10 ++
 Documentation/blockdev/zram.txt            |   3 +
 drivers/block/zram/Kconfig                 |  14 ++
 drivers/block/zram/Makefile                |   3 +-
 drivers/block/zram/zram_dedup.c            | 254 +++++++++++++++++++++++++++++
 drivers/block/zram/zram_dedup.h            |  45 +++++
 drivers/block/zram/zram_drv.c              | 184 +++++++++++++++++----
 drivers/block/zram/zram_drv.h              |  32 +++-
 8 files changed, 507 insertions(+), 38 deletions(-)
 create mode 100644 drivers/block/zram/zram_dedup.c
 create mode 100644 drivers/block/zram/zram_dedup.h

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2.7.4