On 09/20/2012 02:43 AM, Tejun Heo wrote:
> +
> +void task_group_charge(struct task_struct *tsk, u64 cputime)
> +{
> + struct task_group *tg;
> + int cpu = task_cpu(tsk);
> +
> + rcu_read_lock();
> +
> + tg = container_of(task_subsys_state(tsk, cpu_cgroup_subsys_id),
> + struct task_group, css);
> +
> + for (; tg; tg = tg->parent) {
> + u64 *cpuusage = per_cpu_ptr(tg->cpuusage, cpu);
> + *cpuusage += cputime;
> + }
> +
> + rcu_read_unlock();
> +}
> #endif /* CONFIG_CGROUP_SCHED */
The whole point of this merge is that this is not needed.
This information is already available from exec_clock for fair tasks.
for rt tasks, we have no exec clock, but do have a hierarchy walk a bit
below the current cpuacct charge, that can be used for that purpose.
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