[Users] Can not mount cgroup file system in 2.6.32 on Fedora 12.

[Michael H. Warfield]

Hey all,

With the release of 2.6.32, I've been looking to get back involved with
OpenVZ.  Quickly ran into a problem, though.  I'm using cgroups but
found I could not mount the cgroups file system like on Fedora generic
like this in my fstab:

cgroup /var/lib/cgroup  cgroup  defaults 0 0

Seems the cgroup file system isn't compiled in.  Looking at at the
config, seems like there are a bunch of CGROUP related options that are
missing...

107a108,109
> CONFIG_CGROUP_NS=y
> CONFIG_CGROUP_FREEZER=y
108a111,117
> CONFIG_CPUSETS=y
> CONFIG_PROC_PID_CPUSET=y
> CONFIG_CGROUP_CPUACCT=y
> CONFIG_RESOURCE_COUNTERS=y
> CONFIG_CGROUP_MEM_RES_CTLR=y
> CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
> CONFIG_MM_OWNER=y

I may even be missing a few there as well.

I'm not entirely sure what's appropriate for the CONFIG_CGROUP_SCHED
option, though, since OpenVZ adds a CONFIG_VZ_FAIRSCHED=y option.  Is
this going to be a major conflict?

Updating the .ovz configs with the missing ones, it seems to compile
find under rpmbuild on Fedora 12 but then blows up in the build
process...

Executing(%install): /bin/sh -e /var/tmp/rpm-tmp.mMJQBD
+ umask 022
+ cd /home/mhw/rpmbuild/BUILD
+ '[' /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64 '!=' / ']'
+ rm -rf /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64
++ dirname /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64
+ mkdir -p /home/mhw/rpmbuild/BUILDROOT
+ mkdir /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64
+ cd kernel-2.6.32
+ LANG=C
+ export LANG
+ unset DISPLAY
+ cd linux-2.6.32
+ /usr/lib/rpm/check-buildroot
+ /usr/lib/rpm/redhat/brp-compress
+ /usr/lib/rpm/redhat/brp-strip /usr/bin/strip
+ /usr/lib/rpm/redhat/brp-strip-static-archive /usr/bin/strip
+ /usr/lib/rpm/redhat/brp-strip-comment-note /usr/bin/strip /usr/bin/objdump
+ /usr/lib/rpm/brp-python-bytecompile
+ /usr/lib/rpm/redhat/brp-python-hardlink
+ /usr/lib/rpm/redhat/brp-java-repack-jars
Processing files: kernel-2.6.32-afanasyev.1.x86_64
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/vmlinuz-2.6.32-afanasyev.1
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/vmlinux-2.6.32-afanasyev.1
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/System.map-2.6.32-afanasyev.1
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1/kernel
error: File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1/build


RPM build errors:
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/vmlinuz-2.6.32-afanasyev.1
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/vmlinux-2.6.32-afanasyev.1
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/boot/System.map-2.6.32-afanasyev.1
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1/kernel
    File not found: /home/mhw/rpmbuild/BUILDROOT/kernel-2.6.32-afanasyev.1.x86_64/lib/modules/2.6.32-afanasyev.1/build

I've seen that before.  It's a problem in how $BUILDROOT is handled in
the .spec file.  Seems like I started seeing that in some odd packages
beginning with F11.

RHEL 6 is looming closer.  It's more likely to be F13 based than F12
based but the build system problems are going to be similar and
certainly going to want fuller support for CGROUPS, since that's already
a significant feature of F12 as well as the latest cuts of Ubuntu.

Given that OpenVZ 2.6.32 is still pretty new, should these be filled in
Bugzilla or what?

Regards,
Mike
-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
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