From c72ac7a1a926dbffb59daf0f275450e5eecce16f Mon Sep 17 00:00:00 2001 From: Chanho Min Date: Mon, 8 Jul 2013 16:01:49 -0700 Subject: lib: add lz4 compressor module This patchset is for supporting LZ4 compression and the crypto API using it. As shown below, the size of data is a little bit bigger but compressing speed is faster under the enabled unaligned memory access. We can use lz4 de/compression through crypto API as well. Also, It will be useful for another potential user of lz4 compression. lz4 Compression Benchmark: Compiler: ARM gcc 4.6.4 ARMv7, 1 GHz based board Kernel: linux 3.4 Uncompressed data Size: 101 MB Compressed Size compression Speed LZO 72.1MB 32.1MB/s, 33.0MB/s(UA) LZ4 75.1MB 30.4MB/s, 35.9MB/s(UA) LZ4HC 59.8MB 2.4MB/s, 2.5MB/s(UA) - UA: Unaligned memory Access support - Latest patch set for LZO applied This patch: Add support for LZ4 compression in the Linux Kernel. LZ4 Compression APIs for kernel are based on LZ4 implementation by Yann Collet and were changed for kernel coding style. LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html LZ4 source repository : http://code.google.com/p/lz4/ svn revision : r90 Two APIs are added: lz4_compress() support basic lz4 compression whereas lz4hc_compress() support high compression or CPU performance get lower but compression ratio get higher. Also, we require the pre-allocated working memory with the defined size and destination buffer must be allocated with the size of lz4_compressbound. [akpm@linux-foundation.org: make lz4_compresshcctx() static] Signed-off-by: Chanho Min Cc: "Darrick J. Wong" Cc: Bob Pearson Cc: Richard Weinberger Cc: Herbert Xu Cc: Yann Collet Cc: Kyungsik Lee Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/Kconfig | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'lib/Kconfig') diff --git a/lib/Kconfig b/lib/Kconfig index e9cdc8ffdcee..35da51359d40 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -194,6 +194,12 @@ config LZO_COMPRESS config LZO_DECOMPRESS tristate +config LZ4_COMPRESS + tristate + +config LZ4HC_COMPRESS + tristate + config LZ4_DECOMPRESS tristate -- cgit v1.2.2