linux-kernel - Re: [PATCH 3/8] perf: Gather event accounting code

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Message-ID: <20130801132956.GB431@somewhere>
Date:	Thu, 1 Aug 2013 15:30:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/8] perf: Gather event accounting code

On Thu, Aug 01, 2013 at 03:13:30PM +0200, Jiri Olsa wrote:
> On Tue, Jul 23, 2013 at 02:31:01AM +0200, Frederic Weisbecker wrote:
> > Gather all the event accounting code to a single place,
> > once all the prerequisites are completed. This simplifies
> > the refcounting.
> > 
> > Original-patch-by: Peter Zijlstra <peterz@...radead.org>
> > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Jiri Olsa <jolsa@...hat.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Cc: Ingo Molnar <mingo@...nel.org>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: Stephane Eranian <eranian@...gle.com>
> > ---
> >  kernel/events/core.c |   79 +++++++++++++++++++++++++++++--------------------
> >  1 files changed, 47 insertions(+), 32 deletions(-)
> > 
> > diff --git a/kernel/events/core.c b/kernel/events/core.c
> > index c5f435f..3bb73af 100644
> > --- a/kernel/events/core.c
> > +++ b/kernel/events/core.c
> > @@ -3128,6 +3128,21 @@ static void free_event_rcu(struct rcu_head *head)
> >  static void ring_buffer_put(struct ring_buffer *rb);
> >  static void ring_buffer_detach(struct perf_event *event, struct ring_buffer *rb);
> >  
> > +static void __free_event(struct perf_event *event)
> > +{
> > +	if (!event->parent) {
> > +		if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
> > +			put_callchain_buffers();
> > +	}
> > +
> > +	if (event->destroy)
> > +		event->destroy(event);
> > +
> > +	if (event->ctx)
> > +		put_ctx(event->ctx);
> > +
> > +	call_rcu(&event->rcu_head, free_event_rcu);
> > +}
> >  static void free_event(struct perf_event *event)
> >  {
> 
> nitpick, missing nl between functions
> 
> >  	irq_work_sync(&event->pending);
> > @@ -3141,8 +3156,6 @@ static void free_event(struct perf_event *event)
> >  			atomic_dec(&nr_comm_events);
> >  		if (event->attr.task)
> >  			atomic_dec(&nr_task_events);
> > -		if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
> > -			put_callchain_buffers();
> >  		if (is_cgroup_event(event)) {
> >  			atomic_dec(&per_cpu(perf_cgroup_events, event->cpu));
> >  			static_key_slow_dec_deferred(&perf_sched_events);
> > @@ -3180,13 +3193,8 @@ static void free_event(struct perf_event *event)
> >  	if (is_cgroup_event(event))
> >  		perf_detach_cgroup(event);
> >  
> > -	if (event->destroy)
> > -		event->destroy(event);
> > -
> > -	if (event->ctx)
> > -		put_ctx(event->ctx);
> >  
> > -	call_rcu(&event->rcu_head, free_event_rcu);
> > +	__free_event(event);
> 
> nitpick, extra nl above


Ok, I'll fix, thanks!
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