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; adds support for LZ4 compression algorithm.
v8->v9 (reviewed by Andrew Morton): -- add LZ4 backend (+iozone test vs LZO) -- merge patches 'zram: document max_comp_streams' and 'zram: add multi stream functionality' -- do not extern backend struct from source file -- use find()/release() naming instead of get()/put() -- minor code, commit messages and code comments `nitpicks' -- removed Acked-by Minchan Kim from first two patches, because I've changed them a bit. v7->v8 (reviewed by Minchan Kim): -- merge patches 'add multi stream functionality' and 'enable multi stream compression support in zram' -- return status code from set_max_streams knob and print message on error -- do not use atomic type for ->avail_strm -- return back: allocate by default only one stream for multi stream backend -- wake sleeping write in zcomp_strm_multi_put() only if we put stream to idle list -- minor code `nitpicks' 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: add set_max_streams knob zram: make compression algorithm selection possible zram: add lz4 algorithm backend Documentation/ABI/testing/sysfs-block-zram | 17 +- Documentation/blockdev/zram.txt | 45 +++- drivers/block/zram/Kconfig | 10 + drivers/block/zram/Makefile | 4 +- drivers/block/zram/zcomp.c | 349 +++++++++++++++++++++++++++++ drivers/block/zram/zcomp.h | 68 ++++++ drivers/block/zram/zcomp_lz4.c | 47 ++++ drivers/block/zram/zcomp_lz4.h | 17 ++ drivers/block/zram/zcomp_lzo.c | 47 ++++ drivers/block/zram/zcomp_lzo.h | 17 ++ drivers/block/zram/zram_drv.c | 131 ++++++++--- drivers/block/zram/zram_drv.h | 11 +- 12 files changed, 715 insertions(+), 48 deletions(-) create mode 100644 drivers/block/zram/zcomp.c create mode 100644 drivers/block/zram/zcomp.h create mode 100644 drivers/block/zram/zcomp_lz4.c create mode 100644 drivers/block/zram/zcomp_lz4.h create mode 100644 drivers/block/zram/zcomp_lzo.c create mode 100644 drivers/block/zram/zcomp_lzo.h -- 1.9.0.359.g5e34a15 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
