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Subject[PATCHv7 0/7] add compressing abstraction and multi stream support
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This patchset introduces zcomp compression backend abstraction
adding ability to support compression algorithms other than LZO;
support for multi compression streams, making parallel compressions
possible.

v6->v7 (reviewed by Minchan Kim):
-- enable multi and single stream support out of the box (drop
ZRAM_MULTI_STREAM config option)
-- add set_max_stream knob, so we can adjust max number of compression
streams in runtime (for multi stream backend at the moment)
-- minor code `nitpicks'

v5->v6 (reviewed by Minchan Kim):
-- handle single compression stream case separately, using mutex locking,
to address perfomance regression
-- handle multi compression stream using spin lock and wait_event()/wake_up()
-- make multi compression stream support configurable (ZRAM_MULTI_STREAM
config option)

v4->v5 (reviewed by Minchan Kim):
-- renamed zcomp buffer_lock; removed src len and dst len from
compress() and decompress(); not using term `buffer' and
`workmem' in code and documentation; define compress() and
decompress() functions for LZO backend; not using goto's;
do not put idle zcomp_strm to idle list tail.

v3->v4 (reviewed by Minchan Kim):
-- renamed compression backend and working memory structs as requested
by Minchan Kim; fixed several issues noted by Minchan Kim.

Sergey Senozhatsky (7):
zram: introduce compressing backend abstraction
zram: use zcomp compressing backends
zram: factor out single stream compression
zram: add multi stream functionality
zram: enable multi stream compression support in zram
zram: add set_max_streams knob
zram: document max_comp_streams

Documentation/ABI/testing/sysfs-block-zram | 9 +-
Documentation/blockdev/zram.txt | 31 ++-
drivers/block/zram/Makefile | 2 +-
drivers/block/zram/zcomp.c | 324 +++++++++++++++++++++++++++++
drivers/block/zram/zcomp.h | 59 ++++++
drivers/block/zram/zcomp_lzo.c | 48 +++++
drivers/block/zram/zram_drv.c | 96 +++++----
drivers/block/zram/zram_drv.h | 10 +-
8 files changed, 532 insertions(+), 47 deletions(-)
create mode 100644 drivers/block/zram/zcomp.c
create mode 100644 drivers/block/zram/zcomp.h
create mode 100644 drivers/block/zram/zcomp_lzo.c

--
1.9.0.291.g027825b



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