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Date: Tue, 2 Jun 2009 18:30:48 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-tip-commits@vger.kernel.org, linux-kernel@vger.kernel.org,
       acme@redhat.com, paulus@samba.org, hpa@zytor.com, mingo@redhat.com,
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       mtosatti@redhat.com, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com,
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Subject: Re: [tip:perfcounters/core] perf_counter: Use PID namespaces
	properly
Message-ID: <20090602163047.GA17784@redhat.com>
References: <tip-709e50cf870e61745b39552044aa6c7c38e4f9e0@git.kernel.org> <20090602154816.GA15734@redhat.com> <1243960085.13761.190.camel@twins>
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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.