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

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Date:	Wed, 12 Sep 2012 09:30:19 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Jiri Olsa <jolsa@...hat.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 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
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