linux-kernel - Re: [RFC PATCH 3/3] perf tool: Allow wildcard in PMU name

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Date:	Wed, 12 Sep 2012 11:03:59 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	eranian@...gle.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] perf tool: Allow wildcard in PMU name

On Wed, Sep 12, 2012 at 09:30:19AM +0800, Yan, Zheng wrote:
> On 09/11/2012 10:05 PM, Jiri Olsa wrote:
> > On Mon, Sep 10, 2012 at 03:53:51PM +0800, Yan, Zheng wrote:
> >> From: "Yan, Zheng" <zheng.z.yan@...el.com>
> >>
> > 
> > SNIP
> > 
> >> +int parse_events_add_pmu(struct list_head **_list, int *idx,
> >>  			 char *name, struct list_head *head_config)
> >>  {
> >>  	struct perf_event_attr attr;
> >> -	struct perf_pmu *pmu;
> >> +	struct list_head *list;
> >> +	struct perf_pmu *pmu = NULL;
> >> +	struct perf_evsel *evsel, *first = NULL;
> >> +	int orig_idx = *idx;
> >>  
> >> -	pmu = perf_pmu__find(name);
> >> -	if (!pmu)
> >> -		return -EINVAL;
> >> +	list = malloc(sizeof(*list));
> >> +	if (!list)
> >> +		return -ENOMEM;
> >> +	INIT_LIST_HEAD(list);
> > 
> > list should be allocated only if (!*_list)) same as in add_event function
> > 
> > I haven't test, but I think you'll leak/loose events if there's another pmu
> > event defined after ','
> > 
> 
> I think *_list is always NULL, because the code in parse-event.y is:
> 
> ---
> PE_NAME '/' event_config '/'
> {
> 	struct parse_events_data__events *data = _data;
> 	struct list_head *list = NULL;
> 
> 	ABORT_ON(parse_events_add_pmu(&list, &data->idx, $1, $3));
> 	parse_events__free_terms($3);
> 	$$ = list;
> }
> 
> ---
> 
> Regards
> Yan, Zheng

ouch, we update it in parse_events_update_lists.. then the '!list' check
is not needed.. I haven't realized we changed that, sry.

jirka
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