On Mon, Sep 19, 2011 at 11:38 PM, Vivek Goyal <[email protected]> wrote:
> On Mon, Sep 19, 2011 at 09:40:33PM +0530, Balbir Singh wrote:
>> >
>> > Ok. That's fine. So then we can maintain some kind of file which has
>> > list of groups created by cgconfig and we try to reclaim those groups
>> > when service is stopped.
>>
>> Namespaces should solve the problem if properly used
>
> Can you elaborate here what do you mean by namespace? I guess you are
> referring to the fact that don't share top level directory between
> systemd and cgconfig and things should be just fine?
>
A namespace allows you to create a config file without a mount section
and adds the namespace (read "path") to all the groups mentioned under
it
For example, I am using Fedora 15 at the moment and my mount output
for cgroup is
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup
(rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup
(rw,nosuid,nodev,noexec,relatime,perf_event)
When I try to mount a set of cgroups and create directories I get an error
[balbir@balbir libcg]$ sudo cgconfigparser -l /etc/cgconfig.conf
Loading configuration file /etc/cgconfig.conf failed
Cgroup mounting failed
In the samples directory under src/ you will find namespace_config.conf
group www {
perm {
task {
uid = root;
gid = root;
}
admin {
uid = root;
gid = root;
}
}
cpu {
cpu.shares = 1000;
}
cpuacct {
}
}
group ftp {
perm {
task {
uid = root;
gid = root;
}
admin {
uid = root;
gid = root;
}
}
cpu {
cpu.shares = 500;
}
cpuacct {
}
}
namespace {
cpu = daemons;
cpuacct = daemons;
}
When I run cgconfigparser -l samples/namespace_config.conf I see
daemons/www and daemons/ftp
[balbir@balbir libcg]$ ls /sys/fs/cgroup/cpu/daemons/
cgroup.clone_children cgroup.procs cpu.rt_runtime_us ftp
tasks
cgroup.event_control cpu.rt_period_us cpu.shares
notify_on_release www
[balbir@balbir libcg]$ ls /sys/fs/cgroup/cpu/daemons/
cgroup.clone_children cgroup.procs cpu.rt_runtime_us ftp
tasks
cgroup.event_control cpu.rt_period_us cpu.shares
notify_on_release www
For other controllers like memory, I don't see these groups because I
did not ask for them in namespace
[balbir@balbir libcg]$ ls /sys/fs/cgroup/memory/
cgroup.clone_children memory.failcnt
memory.move_charge_at_immigrate memory.stat
notify_on_release
cgroup.event_control memory.force_empty memory.numa_stat
memory.swappiness release_agent
cgroup.procs memory.limit_in_bytes memory.oom_control
memory.usage_in_bytes tasks
libvirt memory.max_usage_in_bytes
memory.soft_limit_in_bytes memory.use_hierarchy
I hope this clarifies what I was saying, cleanup is an issue, but if
we do cgclear with a clear namespace, it should work out
Balbir
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