linux-kernel - Re: [tip:perfcounters/core] perf_counter: Use PID namespaces properly

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Date:	Tue, 2 Jun 2009 18:30:48 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, paulus@...ba.org, hpa@...or.com, mingo@...hat.com,
	jkacur@...hat.com, efault@....de, ebiederm@...ssion.com,
	mtosatti@...hat.com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: Re: [tip:perfcounters/core] perf_counter: Use PID namespaces
	properly

On 06/02, Peter Zijlstra wrote:
>
> On Tue, 2009-06-02 at 17:55 +0200, Oleg Nesterov wrote:
> > 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);
> > 
> > ?
> 
> That seems to be exactly what task_tgid_nr_ns() does.

Ah, yes, I didn't notice _tgid_ above.

Oleg.

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