1
linux/scripts
Albin Tonnerre 7dd65feb6c 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

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: cleanup]
Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Tested-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Russell King <rmk@arm.linux.org.uk>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-01-11 09:34:04 -08:00
..
basic kbuild: move autoconf.h to include/generated 2009-12-12 13:08:15 +01:00
dtc dtc: Mark various internal functions static 2009-11-15 15:01:41 -08:00
genksyms genksyms: properly consider EXPORT_UNUSED_SYMBOL{,_GPL}() 2009-12-12 13:08:16 +01:00
kconfig kbuild: generate modules.builtin 2009-12-12 13:08:16 +01:00
ksymoops
mod Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
package scripts/package: deb-pkg: use fakeroot if available 2009-12-12 13:08:16 +01:00
rt-tester
selinux SELinux: header generation may hit infinite loop 2009-11-23 09:00:44 +11:00
tracing
.gitignore
bin2c.c
binoffset.c
bloat-o-meter
bootgraph.pl
checkincludes.pl
checkkconfigsymbols.sh kbuild,scripts: use non-builtin echo for '-e' 2009-10-11 23:21:25 +02:00
checkpatch.pl checkpatch: version 0.30 2009-10-29 07:39:31 -07:00
checkstack.pl
checksyscalls.sh
checkversion.pl
cleanfile
cleanpatch
config
conmakehash.c
decodecode
diffconfig
export_report.pl
extract-ikconfig
gcc-version.sh
gcc-x86_32-has-stack-protector.sh
gcc-x86_64-has-stack-protector.sh
gen_initramfs_list.sh
get_maintainer.pl scripts/get_maintainer.pl: support multiple VCSs - add mercurial 2009-12-15 08:53:29 -08:00
gfp-translate
headerdep.pl
headers_check.pl
headers_install.pl warn about use of uninstalled kernel headers 2009-10-11 23:21:25 +02:00
headers.sh kbuild: do not check for include/asm-$ARCH 2009-12-12 13:08:14 +01:00
kallsyms.c
Kbuild.include kbuild: generate modules.builtin 2009-12-12 13:08:16 +01:00
kernel-doc tracing: Add DEFINE_EVENT(), DEFINE_SINGLE_EVENT() support to docbook 2009-12-02 09:57:37 +01:00
Lindent
Makefile
Makefile.build MIPS: Tracing: Add an endian argument to scripts/recordmcount.pl 2009-12-17 01:57:22 +00:00
Makefile.clean
Makefile.fwinst
Makefile.headersinst
Makefile.host
Makefile.lib lib: add support for LZO-compressed kernels 2010-01-11 09:34:04 -08:00
Makefile.modbuiltin kbuild: generate modules.builtin 2009-12-12 13:08:16 +01:00
Makefile.modinst
Makefile.modpost
makelst
markup_oops.pl
mkcompile_h kbuild: move autoconf.h to include/generated 2009-12-12 13:08:15 +01:00
mkmakefile
mksysmap
mkuboot.sh
mkversion
module-common.lds
namespace.pl
patch-kernel
pnmtologo.c
profile2linkerlist.pl
recordmcount.pl MIPS: Tracing: Add dynamic function tracer support 2009-12-17 01:57:23 +00:00
setlocalversion
show_delta
tags.sh kbuild: specify absolute paths for cscope 2009-12-12 13:08:16 +01:00
unifdef.c unifdef: update to upstream revision 1.190 2009-12-12 13:08:16 +01:00
ver_linux