leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
7cd01b08d3
linux/arch/powerpc/boot
History
Joel Stanley 747b217608 powerpc/boot: Build boot wrapper with optimisations 
The boot wrapper is currently built with -Os. By building with O2 we
can meaningfully reduce the time decompressing the kernel.

I tested by comparing 10 runs of each option in Qemu and on hardware.
The kernel is compressed with KERNEL_XZ built with GCC 8.2.0-7ubuntu1.
The values are counts of the timebase.

Qemu TCG powernv Power8:

              Os            O2            O3
 median       10221123889   6201518438    6568186825
 stddev        1361267211    429090641     657930076
 improvement                    39.33%        35.74%

Palmetto Power8:

              Os            O2            O3
 median           50279         50599          35790
 stddev       992144533     627130655      623721078
 improvement                   36.79%         37.13%

Romulus Power9:

              Os            O2            O3
 median       670312391     454733720      448881398
 stddev          157569        107276         108760
 improvement                   32.16%         33.03%

TCG was quite noisy, with every few runs producing an outlier. Even so,
O2 is faster than O3. On hardware the numbers were less noisy and O3 is
slightly faster than O2.

The wrapper size increases when moving from Os. Comparing zImage.epapr
to the existing Os build using bloat-o-meter:

  Before=43401, After=56837 (13KB), chg +30.96%
  Before=43401, After=64305 (20KB), chg +48.16%

I chose O2 for a balance between Qemu and hardware speed up.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-10-13 22:21:25 +11:00
..
dts powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
.gitignore powerpc/boot: Expose Kconfig symbols to wrapper 2018-10-13 22:21:25 +11:00
4xx.c powerpc/44x: Fix mask and shift to zero bug 2017-08-31 14:26:06 +10:00
4xx.h
44x.h
addnote.c powerpc/boot: Add 64bit and little endian support to addnote 2014-04-28 17:36:00 +10:00
bamboo.c
cpm-serial.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crt0.S powerpc/boot: Ensure _zimage_start is a weak symbol 2018-09-19 22:08:12 +10:00
crtsavres.S powerpc/64: Do not link crtsaveres.o in boot 2017-05-30 14:59:51 +10:00
cuboot-8xx.c
cuboot-52xx.c
cuboot-83xx.c
cuboot-85xx-cpm2.c
cuboot-85xx.c
cuboot-824x.c
cuboot-acadia.c
cuboot-amigaone.c
cuboot-bamboo.c
cuboot-ebony.c
cuboot-hotfoot.c
cuboot-katmai.c
cuboot-kilauea.c
cuboot-mpc7448hpc2.c
cuboot-pq2.c
cuboot-rainier.c
cuboot-sam440ep.c
cuboot-sequoia.c
cuboot-taishan.c
cuboot-warp.c
cuboot-yosemite.c
cuboot.c
cuboot.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dcr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
decompress.c powerpc/boot: Add support for XZ compression 2016-09-28 14:35:14 +10:00
devtree.c
div64.S
dummy.c
ebony.c
elf_util.c powerpc/boot: Add little endian support to elf utils 2014-04-28 17:36:04 +10:00
elf.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ep88xc.c
ep405.c
ep8248e.c
epapr-wrapper.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
epapr.c powerpc/zImage: make the "OF" wrapper support ePAPR boot 2013-09-25 14:18:44 +10:00
fixed-head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fixup-headers.sed powerpc/boot: Add sed script 2016-09-28 14:20:44 +10:00
fsl-soc.c
fsl-soc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gamecube-head.S
gamecube.c
hack-coff.c
holly.c
install.sh
io.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
libfdt_env.h powerpc/boot: Remove duplicate typedefs from libfdt_env.h 2018-04-01 00:47:47 +11:00
libfdt-wrapper.c powerpc/boot/fdt: Use unsigned long for pointer casts 2015-03-16 18:58:30 +11:00
main.c powerpc/boot: Fix the early OPAL console wrappers 2016-11-24 17:34:01 +11:00
Makefile powerpc/boot: Build boot wrapper with optimisations 2018-10-13 22:21:25 +11:00
mktree.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
motload-head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpc8xx.c powerpc/boot: remove unused variable in mpc8xx 2018-06-04 00:39:17 +10:00
mpc8xx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpc52xx-psc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mvme5100.c powerpc/embedded6xx: Add support for Motorola/Emerson MVME5100 2014-01-09 17:52:20 -06:00
mvme7100.c powerpc/86xx: Add support for Emerson/Artesyn MVME7100 2016-07-08 20:01:27 -05:00
ns16550.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
of.c powerpc/boot: Rework of_claim() to make it 64bit friendly 2014-04-28 17:35:43 +10:00
of.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ofconsole.c powerpc/boot: Add byteswapping routines in oflib 2014-04-28 17:35:35 +10:00
oflib.c powerpc/boot: Define a routine to enter prom 2014-04-28 17:36:08 +10:00
opal-calls.S powerpc/boot: Fix the early OPAL console wrappers 2016-11-24 17:34:01 +11:00
opal.c powerpc/boot: Fix opal console in boot wrapper 2018-10-13 22:21:25 +11:00
ops.h powerpc/boot: Remove support for Marvell MPSC serial controller 2018-06-04 00:39:22 +10:00
page.h powerpc: Fix _ALIGN_* errors due to type difference. 2015-10-09 08:02:25 +11:00
planetcore.c powerpc/boot: drop planetcore_set_serial_speed 2015-03-16 18:50:17 +11:00
planetcore.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ppc_asm.h powerpc/time: refactor MFTB() to limit number of ifdefs 2017-08-10 23:32:09 +10:00
ppcboot-hotfoot.h
ppcboot.h powerpc/86xx: Add support for Emerson/Artesyn MVME7100 2016-07-08 20:01:27 -05:00
pq2.c
pq2.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ps3-head.S powerpc/ps3: Fix system hang with GCC 5 builds 2016-11-30 23:19:59 +11:00
ps3-hvcall.S
ps3.c powerpc/ps3: Fix system hang with GCC 5 builds 2016-11-30 23:19:59 +11:00
pseries-head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
README
redboot-8xx.c
redboot-83xx.c
redboot.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
reg.h
rs6000.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
serial.c powerpc/boot: Expose Kconfig symbols to wrapper 2018-10-13 22:21:25 +11:00
simple_alloc.c
simpleboot.c powerpc/simpleboot: fix comment 2014-08-26 09:35:57 +02:00
stdbool.h powerpc/boot: Add support for XZ compression 2016-09-28 14:35:14 +10:00
stdint.h powerpc/boot: Add support for XZ compression 2016-09-28 14:35:14 +10:00
stdio.c powerpc: boot: add strrchr function 2018-03-05 20:58:17 -06:00
stdio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stdlib.c
stdlib.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
string.h powerpc: boot: add strrchr function 2018-03-05 20:58:17 -06:00
string.S
swab.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
treeboot-akebono.c powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
treeboot-bamboo.c
treeboot-currituck.c powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
treeboot-ebony.c
treeboot-iss4xx.c powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
treeboot-walnut.c
types.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uartlite.c
ugecon.c
ugecon.h
util.S powerpc/time: refactor MFTB() to limit number of ifdefs 2017-08-10 23:32:09 +10:00
virtex405-head.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
virtex.c
wii-head.S
wii.c
wrapper kbuild: Use ls(1) instead of stat(1) to obtain file size 2018-03-26 02:01:24 +09:00
xz_config.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
zImage.coff.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
zImage.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
zImage.ps3.lds.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00

README 

To extract the kernel vmlinux, System.map, .config or initrd from the zImage binary:

objcopy -j .kernel:vmlinux -O binary zImage vmlinux.gz
objcopy -j .kernel:System.map -O binary zImage System.map.gz
objcopy -j .kernel:.config -O binary zImage config.gz
objcopy -j .kernel:initrd -O binary zImage.initrd initrd.gz


	Peter