Re: [tip:perfcounters/core] perf_counter: Use PID namespacesproperly

[Oleg Nesterov]

On 06/02, tip-bot for Peter Zijlstra wrote:
>
> +static u32 perf_counter_pid(struct perf_counter *counter, struct task_struct *p)
> +{
> +	/*
> +	 * only top level counters have the pid namespace they were created in
> +	 */
> +	if (counter->parent)
> +		counter = counter->parent;
> +
> +	return task_tgid_nr_ns(p, counter->ns);
> +}
> +
> +static u32 perf_counter_tid(struct perf_counter *counter, struct task_struct *p)
> +{
> +	/*
> +	 * only top level counters have the pid namespace they were created in
> +	 */
> +	if (counter->parent)
> +		counter = counter->parent;
> +
> +	return task_pid_nr_ns(p, counter->ns);

Perhaps this should be

	return task_pid_nr_ns(p->group_leader);

?

> +		tid_entry.pid = perf_counter_pid(counter, current);
> +		tid_entry.tid = perf_counter_tid(counter, current);


Otherwise we seem to always report .pid == .tid

Oleg.

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