|author||Albin Tonnerre <firstname.lastname@example.org>||2010-01-08 14:42:42 -0800|
|committer||Linus Torvalds <email@example.com>||2010-01-11 09:34:04 -0800|
lib: add support for LZO-compressed kernels
This patch series adds generic support for creating and extracting LZO-compressed kernel images, as well as support for using such images on the x86 and ARM architectures, and support for creating and using LZO-compressed initrd and initramfs images. Russell King said: : Testing on a Cortex A9 model: : - lzo decompressor is 65% of the time gzip takes to decompress a kernel : - lzo kernel is 9% larger than a gzip kernel : : which I'm happy to say confirms your figures when comparing the two. : : However, when comparing your new gzip code to the old gzip code: : - new is 99% of the size of the old code : - new takes 42% of the time to decompress than the old code : : What this means is that for a proper comparison, the results get even better: : - lzo is 7.5% larger than the old gzip'd kernel image : - lzo takes 28% of the time that the old gzip code took : : So the expense seems definitely worth the effort. The only reason I : can think of ever using gzip would be if you needed the additional : compression (eg, because you have limited flash to store the image.) : : I would argue that the default for ARM should therefore be LZO. This patch: The lzo compressor is worse than gzip at compression, but faster at extraction. Here are some figures for an ARM board I'm working on: Uncompressed size: 3.24Mo gzip 1.61Mo 0.72s lzo 1.75Mo 0.48s So for a compression ratio that is still relatively close to gzip, it's much faster to extract, at least in that case. This part contains: - Makefile routine to support lzo compression - Fixes to the existing lzo compressor so that it can be used in compressed kernels - wrapper around the existing lzo1x_decompress, as it only extracts one block at a time, while we need to extract a whole file here - config dialog for kernel compression [firstname.lastname@example.org: coding-style fixes] [email@example.com: cleanup] Signed-off-by: Albin Tonnerre <firstname.lastname@example.org> Tested-by: Wu Zhangjin <email@example.com> Acked-by: "H. Peter Anvin" <firstname.lastname@example.org> Cc: Ingo Molnar <email@example.com> Cc: Thomas Gleixner <firstname.lastname@example.org> Tested-by: Russell King <email@example.com> Acked-by: Russell King <firstname.lastname@example.org> Cc: Ralf Baechle <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
Diffstat (limited to 'init/Kconfig')
1 files changed, 14 insertions, 4 deletions
diff --git a/init/Kconfig b/init/Kconfig
index a23da9f0180..d95ca7cd5d4 100644
@@ -115,10 +115,13 @@ config HAVE_KERNEL_BZIP2
prompt "Kernel compression mode"
- depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
+ depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_LZO
The linux kernel is a kind of self-extracting executable.
Several compression algorithms are available, which differ
@@ -141,9 +144,8 @@ config KERNEL_GZIP
depends on HAVE_KERNEL_GZIP
- The old and tried gzip compression. Its compression ratio is
- the poorest among the 3 choices; however its speed (both
- compression and decompression) is the fastest.
+ The old and tried gzip compression. It provides a good balance
+ between compression ratio and decompression speed.
@@ -164,6 +166,14 @@ config KERNEL_LZMA
two. Compression is slowest. The kernel size is about 33%
smaller with LZMA in comparison to gzip.
+ bool "LZO"
+ depends on HAVE_KERNEL_LZO
+ Its compression ratio is the poorest among the 4. The kernel
+ size is about about 10% bigger than gzip; however its speed
+ (both compression and decompression) is the fastest.