Package: cgroup-bin
Version: 0.37-1
Severity: important
Hello,
The default installation seems to use (in /etc/cgconfig.con):
cpu = /sys/fs/cgroup
cpuacct = /sys/fs/cgroup/cpuacct
etc...
Is will be cleaner to use a small tmfs mount for /sys/fs/cgroup and then change
the above to:
cpu = /sys/fs/cgroup/cpu
cpuacct = /sys/fs/cgroup/cpuacct
etc...
The above also causes problems when restarting cgconfig. Using strace it seems
that cgconfigparser attempts to rmdir /sys/fs/cgroup (because it is listed in
the 'cpu' line) which is not permitted and it fails.
Just changing 'cpu' entry (without using a tmpfs mount point) does not fix
the problem because it is not possible to create dirs under /sys/fs/cgroup.
The problems makes reloading of /etc/cgconfig.conf impossible since
/etc/init.d/cgconfig restart fails.
Using a small tmpfs seems to solve this. It also solves a minor problem with
/etc/init.d/cgred which fails if none of the mounted cgroup partitions
is mounted as 'cgroup'. For example, using:
mount -t cgroup -o cpu none /sys/fs/cgroup
will make /etc/init.d/cgred restart fail because of line 80:
if ! grep "^cgroup" /proc/mounts &>/dev/null; then
which expects a mount like this one:
mount -t cgroup -o cpu cgroup /sys/fs/cgroup
Thus, the tmpfs should be mounted with:
mount -t tmpfs -o size=1M,mode=755 cgroup /sys/fs/cgroup
and it will make the rest of cgroup mountings immune to the init.d/cgred
problem.
Testing the tmpfs existance is also easy since a touch under it will fail
if it is not mounted:
if ! touch /sys/fs/cgroup/.test 2>&1 ; then
mount -t tmpfs -o size=1M,mode=755 cgroup /sys/fs/cgroup
else
rm -f /sys/fs/cgroup/.test
fi
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1,
'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.36-v2-v (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages cgroup-bin depends on:
ii libc6 2.11.2-7 Embedded GNU C Library: Shared lib
ii libcgroup1 0.37-1 A library to control and monitor c
cgroup-bin recommends no packages.
cgroup-bin suggests no packages.
-- Configuration Files:
/etc/cgconfig.conf changed [not included]
/etc/cgrules.conf changed [not included]
/etc/default/cgred changed [not included]
-- no debconf information
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