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Section 2.9.2, reads:
Therefore, it is advisable to move all processes from the root group to a specific subgroup when using the blkio and cpu configuration options which divide an available resource based on a weight or a share (for example, cpu.shares or blkio.weight). To move all tasks from the root group into a specific subgroup, you can use the following command:
rootgroup]# for i in `cat tasks`; do echo $i > red/tasks; done
The for loop above suffer from two issues:
1) It copies the tasks from root group to subgroup rather than moving them.
2) It overrides any tasks in the subgroup.
To avoid these, I suggest the code would become:
rootgroup]# for i in `cat tasks`; do echo $i >> red/tasks; done
rootgroup]# echo '' > tasks
That's all.