Hi,
I created a "cpu" cgroup:
mkdir /dev/cgroup
mkdir /dev/cgroup/cpu
mount -t cgroup -o cpu cpu /dev/cgroup/cpu
cd /dev/cgroup/cpu/
mkdir low
Now, I try to move tasks to the sub-cgroup "low":
for task in `cat /dev/cgroup/cpu/tasks`; do /bin/echo $task >
/dev/cgroup/cpu/low/tasks || echo "Failed to move PID $task"; done
/bin/echo: write error: Invalid argument
Failed to move PID 3
/bin/echo: write error: Invalid argument
Failed to move PID 4
/bin/echo: write error: Invalid argument
Failed to move PID 5
/bin/echo: write error: Invalid argument
Failed to move PID 6
/bin/echo: write error: Invalid argument
Failed to move PID 7
/bin/echo: write error: Invalid argument
Failed to move PID 8
/bin/echo: write error: Invalid argument
.
.
.
/bin/echo: write error: Invalid argument
Failed to move PID 58
I was able to move the "init" process itself. However, I failed to move specific
kernel threads:
root 3 2 0 18:16 ? 00:00:00 [migration/0]
root 4 2 0 18:16 ? 00:00:00 [sirq-high/0]
root 5 2 0 18:16 ? 00:00:04 [sirq-timer/0]
root 6 2 0 18:16 ? 00:00:00 [sirq-net-tx/0]
root 7 2 0 18:16 ? 00:00:00 [sirq-net-rx/0]
root 8 2 0 18:16 ? 00:00:00 [sirq-block/0]
root 9 2 0 18:16 ? 00:00:00 [sirq-block-iopo]
root 10 2 0 18:16 ? 00:00:00 [sirq-tasklet/0]
root 11 2 0 18:16 ? 00:00:00 [sirq-sched/0]
root 12 2 0 18:16 ? 00:00:00 [sirq-hrtimer/0]
root 13 2 0 18:16 ? 00:00:04 [sirq-rcu/0]
root 14 2 0 18:16 ? 00:00:00 [watchdog/0]
root 15 2 0 18:16 ? 00:00:00 [desched/0]
root 16 2 0 18:16 ? 00:00:00 [migration/1]
root 17 2 0 18:16 ? 00:00:00 [sirq-high/1]
root 18 2 0 18:16 ? 00:00:03 [sirq-timer/1]
root 19 2 0 18:16 ? 00:00:00 [sirq-net-tx/1]
root 20 2 0 18:16 ? 00:00:00 [sirq-net-rx/1]
root 21 2 0 18:16 ? 00:00:00 [sirq-block/1]
Is there something special about these threads that prevents them from being
moved to a different cgroup? Is there something I am missing?
Thanks!
Avi.
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