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lawilog
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PostPosted: Sun Nov 29, 2009 4:14 pm    Post subject: kernel 2.6.32 will support auto "current modules to con Reply with quote

hi,

i have read that the new kernel 2.6.32 will support a new make target, which will enable exactly those modules in the kernel config, which are currently loaded. that's why i had the idea that during the gentoo installation (when many modules have been automaticcaly loaded from the boot cd) this could be used to create a basic configuration right before the user runs "make menuconfig" for the first time. what do you think about that?

Lars
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PostPosted: Sun Nov 29, 2009 4:37 pm    Post subject: Reply with quote

If the user doesn't compile his own kernel, then Genkernel handle it actually pretty well right now.
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PostPosted: Sun Nov 29, 2009 4:56 pm    Post subject: Reply with quote

right, but most gentoo users i know do compile their own kernel.
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PostPosted: Sun Nov 29, 2009 6:52 pm    Post subject: Reply with quote

it would save a lot of time cause your not trying to find stuff in the config
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PostPosted: Sun Nov 29, 2009 6:56 pm    Post subject: Re: kernel 2.6.32 will support auto "current modules to Reply with quote

lawilog wrote:
what do you think about that?
Lars


Very good idea

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costel78
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PostPosted: Sun Nov 29, 2009 9:46 pm    Post subject: Reply with quote

What is exactly the name of that target ? I'm unable to find nothing related.
Thank you.

Later: localmodconfig - it was my bad English. devfs 2.0 look impresive, also.
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PostPosted: Mon Dec 07, 2009 11:36 am    Post subject: more details regarding localmodconfig Reply with quote

Below some details for information only:

Quote:
Zitat:
From: Steven Rostedt <rostedt <at> goodmis.org>
Subject: [PATCH 00/15] [GIT PULL] kconfig: localmodconfig for v2.6.32
Newsgroups: gmane.linux.kbuild.devel, gmane.linux.kernel
Date: 2009-09-11 19:58:49 GMT (11 weeks, 5 days, 13 hours and 5 minutes ago)
Linus,

This is the patch set that creates localmodconfig and localyesconfig.
This will facilitate testers by removing the thousand modules that
distributions enable with only the ones that they have loaded.

Yes it may miss usb devices that you don't have plugged in, but it will
save a lot of time in compiling by only compiling the code that you
have loaded.

The usage is quite simple. Just download the latest kernel.org kernel
(with this changeset in), cd to that directory and then do:

make localmodconfig

It will search for a .config locally first, then will look for
/proc/config.gz, then it will search the /boot directory for configs
matching the local kernel (uname -r). If it still does not find one
It search for configurations in the local binarys (vmlinux, /lib/modules..,
kernel/configs.ko, etc).

Once it finds a config to use, it will then read all the Kconfigs
and Makefiles to find out what config compiles what module. Then lsmod
is used to see what modules are loaded, and it will keep enabled all
the configs (including dependencies) that those modules require to
build. It disables all modules not needed.

Note, it only disables it does not enable, because a lot of modules
can be enabled by more than one config, and I don't want to guess.
I could someday enable easy configs (1 to 1 matches of config to module).

It also does nothing with built in code (=y). It does not enable or
disable them.

I've been using this code (various versions of) since 2005, and
so have others. When I get a new box, the first thing I do is
boot up the distribution kernel, download kernel.org kernel, and run
this script to get the modules needed to boot the kernel.

** CONFLICTS **

linux-next has proven that there is a conflict between these patches
and Sam Ravnborg's tree. I've tried to get in contact with Sam, but
he seems to be out. I don't want to hold up this push on that account.
But if you want, I could wait to fix the conflicts, or you can pull
this and he can fix it on his end. I'm fine with it. I just think
that this tool is important enough to get into mainline, especially
early in the merge window since it will help others test it.

Please pull kconfig updates for v2.6.32 from:

git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig.git
for-linus

Steven Rostedt (15):
kconfig: add streamline_config.pl to scripts
kconfig: make localmodconfig to run streamline_config.pl
kconfig: add make localyesconfig option
kconfig: streamline_config.pl do not stop with no depends
kconfig: do not warn about modules built in
kconfig: enable CONFIG_IKCONFIG from streamline_config.pl
kconfig: add check if end exists in extract-ikconfig
kconfig: have extract-ikconfig read ELF files
kconfig: keep config.gz around even if CONFIG_IKCONFIG_PROC is not set
kconfig: search for a config to base the local(mod|yes)config on
kconfig: unset IKCONFIG_PROC and clean up nesting
kconfig: test for /boot/config-uname after /proc/config.gz in localconfig
kconfig: make local .config default for streamline_config
kconfig: test if a .config already exists
kconfig: add missing dependency of conf to localyesconfig

----
kernel/Makefile | 2 +-
scripts/extract-ikconfig | 14 ++
scripts/kconfig/Makefile | 34 +++-
scripts/kconfig/streamline_config.pl | 366 ++++++++++++++++++++++++++++++++++
4 files changed, 414 insertions(+), 2 deletions(-)
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Code:


 /pub/scm / linux/kernel/git/torvalds/linux-2.6.git / commitdiff
 ? search:   re
summary | shortlog | log | commit | commitdiff | tree
raw | patch (parent: 03fa25d)
kconfig: add make localyesconfig option
author   Steven Rostedt <srostedt@redhat.com>   
   Thu, 30 Apr 2009 02:52:23 +0000 (22:52 -0400)   
committer   Steven Rostedt <rostedt@goodmis.org>   
   Wed, 19 Aug 2009 01:55:49 +0000 (21:55 -0400)   
This adds the option localyesconfig to make. This is similar to
localmodconfig, but after it removes unnecessary modules it runs

  sed -i s/=m/=y/

on the .config file. It then runs "make silentoldconfig" to fix any
wholes that were created by the conversion of modules to core.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
scripts/kconfig/Makefile
   patch | blob | history


diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index e4d8394..12a4d9e 100644 (file)
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -3,7 +3,7 @@
 # These targets are used from top-level makefile
 
 PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config \
-       localmodconfig
+       localmodconfig localyesconfig
 
 ifdef KBUILD_KCONFIG
 Kconfig := $(KBUILD_KCONFIG)
@@ -38,6 +38,16 @@ localmodconfig: $(obj)/streamline_config.pl $(obj)/conf
                 mv -f .config.old.1 .config.old)
        $(Q)rm -f .tmp.config
 
+localyesconfig: $(obj)/streamline_config.pl
+       $(Q)perl $< $(Kconfig) > .tmp.config
+       $(Q)sed -i s/=m/=y/ .tmp.config
+       $(Q)cmp -s .tmp.config .config ||               \
+               (mv -f .config .config.old.1;           \
+                mv -f .tmp.config .config;             \
+                $(obj)/conf -s $(Kconfig);             \
+                mv -f .config.old.1 .config.old)
+       $(Q)rm -f .tmp.config
+
 # Create new linux.pot file
 # Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files
 # The symlink is used to repair a deficiency in arch/um
@@ -94,6 +104,7 @@ help:
        @echo  '  gconfig         - Update current config utilising a GTK based front-end'
        @echo  '  oldconfig       - Update current config utilising a provided .config as base'
        @echo  '  localmodconfig  - Update current config disabling modules not loaded'
+       @echo  '  localyesconfig  - Update current config converting local mods to core'
        @echo  '  silentoldconfig - Same as oldconfig, but quietly, additionally update deps'
        @echo  '  randconfig      - New config with random answer to all options'
        @echo  '  defconfig       - New config with default answer to all options'
Cache Last Updated: Thu Dec 3 08:12:02 2009 GMT
Linus' kernel tree
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d2_racing
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PostPosted: Mon Dec 07, 2009 1:01 pm    Post subject: Reply with quote

Do we really needs this option if you use a custom kernel :

Code:

make localmodconfig


Maybe this command doesn't concern Gentoo if you don't use Genkernel.
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PostPosted: Tue Dec 08, 2009 7:44 am    Post subject: Reply with quote

As far as i understand this option, it is very helpful to get to a customized kernel.

My future strategie to built a new customized kernel would be:

Running a kernel supporting nearly all options as a base. Special hardware which needs a loaded firmware to get recognized by the kernel should have loaded too.
Running make localmodconfig should configure automatically the needed modules, supporting your built in and connected hardware while running this script, for you.

This should be more easier than fiddleing around with the output of lspci lsmod lsusb and so on, to decide what's needed to built in to your kernel, to get a customized config only for your needs and the used hardware.

@d2_racing: Regarding your questions:

Especially when you want to built your customized kernel (not when you use it already, and it's complete and lean)
this option is very helpful.
And, if you doesn't use genkernel, you use a customized kernel, and so need it too.

Has anyone tried it?
I haven't had the time las weekend, cause Nikolaus...
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PostPosted: Tue Dec 08, 2009 12:41 pm    Post subject: Reply with quote

I would like to know, if this new command remove the extra stuff that is using the [M] or it can even remove the extra stuff that is builtin inside the kernel.
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PostPosted: Tue Dec 08, 2009 1:43 pm    Post subject: Reply with quote

As my posted info said, in short form...

This will facilitate testers by removing the thousand modules that
distributions enable with only the ones that they have loaded.


Then lsmod
is used to see what modules are loaded, and it will keep enabled all
the configs (including dependencies) that those modules require to
build. It disables all modules not needed.

Note, it only disables it does not enable, because a lot of modules
can be enabled by more than one config, and I don't want to guess.
I could someday enable easy configs (1 to 1 matches of config to module).

It also does nothing with built in code (=y). It does not enable or
disable them.


:wink:
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PostPosted: Thu Feb 04, 2010 8:19 pm    Post subject: Reply with quote

This looks extremely helpful, and I would like to use it with genkernel 64-bit. On my gentoo machines, I started with the default config, and spend quite a bit of time in menuconfig paring down unwanted hardware module options. Sometimes one goes too far and it doesn't boot ;)

Can anyone provide an example syntax to use this with genkernel? I would guess --makeopts= won't work, since localmodconfig is a make target.

Thanks.
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PostPosted: Wed Feb 10, 2010 4:49 am    Post subject: Reply with quote

What is the definition of 'loaded modules only'? I was hoping to reduce the set to modules loaded by exiting hardware only. The modules loaded by LiveCDs such as SystemRescueCD, etc. seem to include many more:
Code:
(chroot) sysresccd # lsmod
Module                  Size  Used by
video                  19964  0
output                  2656  1 video
r8169                  30212  0
i2c_i801                9216  0
i2c_core               18256  1 i2c_i801
shpchp                 31404  0
raid10                 20848  0
raid456                47728  0
raid6_pq               78368  1 raid456
async_xor               3264  1 raid456
async_memcpy            2080  1 raid456
async_tx                2896  3 raid456,async_xor,async_memcpy
xor                     4848  2 raid456,async_xor
raid1                  21600  0
raid0                   7108  0
sbp2                   19852  0
ohci1394               27444  0
ieee1394               69000  2 sbp2,ohci1394
sl811_hcd              10784  0
usb_storage            43808  0
virtio_blk              6504  0
bnx2i                  35740  0
cnic                   22248  1 bnx2i
uio                    10112  1 cnic
ipv6                  279648  25 cnic
fcoe                   17248  0
libfcoe                12692  1 fcoe
libfc                  66896  2 fcoe,libfcoe
osst                   47592  0
sym53c8xx              69816  0
atp870u                26448  0
hptiop                 12704  0
ses                     6208  0
enclosure               6992  1 ses
aic79xx               118860  0
aic7xxx               107996  0
aic94xx                66236  0
ppa                     9884  0
raid_class              4848  0
sym53c500_cs            7760  0
qlogic_cs               5920  0
qlogicfas408            5040  1 qlogic_cs
aacraid                66312  0
imm                    10412  0
parport                29904  2 ppa,imm
mvsas                  42464  0
3w_xxxx                22816  0
initio                 17240  0
gdth                   77256  0
arcmsr                 21712  0
stex                   13780  0
tmscsim                18960  0
dc395x                 30028  0
iscsi_tcp              11372  0
libiscsi_tcp           13556  1 iscsi_tcp
3w_9xxx                31812  0
a100u2w                 9120  0
BusLogic               21552  0
libsrp                  6000  0
libiscsi               32512  3 bnx2i,iscsi_tcp,libiscsi_tcp
st                     34100  0
ch                     11960  0
scsi_transport_srp      5424  0
scsi_transport_spi     21024  3 sym53c8xx,aic79xx,aic7xxx
qla4xxx                49672  0
scsi_transport_iscsi    24864  4 bnx2i,iscsi_tcp,libiscsi,qla4xxx
qla2xxx               212940  0
lpfc                  368452  0
scsi_transport_fc      38548  4 fcoe,libfc,qla2xxx,lpfc
scsi_tgt               11072  3 libsrp,scsi_transport_srp,scsi_transport_fc
qla1280                21232  0
megaraid_sas           32924  0
megaraid               34564  0
pdc_adma                7412  0
sata_vsc                5956  0
sata_via               10020  0
sata_uli                4516  0
sata_sx4               10276  0
sata_svw                5572  0
sata_sis                5636  0
sata_sil                9496  0
sata_sil24             13380  0
sata_qstor              7524  0
sata_promise           11540  0
sata_nv                22508  0
sata_mv                26948  0
sata_inic162x           9332  0
pata_via                9592  0
pata_triflex            4420  0
pata_sl82c105           4864  0
pata_sis               11492  1 sata_sis
pata_sil680             6404  0
pata_serverworks        7088  0
pata_sch                3908  0
pata_pdc202xx_old       5552  0
pata_pdc2027x           7812  0
pata_pcmcia            11920  0
pata_opti               4052  0
pata_optidma            6008  0
pata_oldpiix            4356  0
pata_ns87415            4628  0
pata_ns87410            4144  0
pata_ninja32            4512  0
pata_netcell            3444  0
pata_marvell            3872  0
pata_jmicron            3408  0
pata_it821x            10756  0
pata_it8213             4772  0
pata_hpt3x3             4772  0
pata_hpt3x2n            6368  0
pata_hpt37x            12320  0
pata_hpt366             6560  0
pata_efar               4708  0
pata_cypress            3952  0
pata_cs5530             5968  0
pata_cs5520             5888  0
pata_cmd64x             7008  0
pata_cmd640             4816  0
pata_atiixp             4896  0
pata_artop              5988  0
pata_amd               11940  0
pata_ali               10768  0
pata_acpi               4464  0
scsi_wait_scan          1184  0
ata_generic             4660  0
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