Re: [PATCH V2 04/14] perf script: Set up output options for in-stream attributes

[David Ahern <dsahern@gmail.com>]

On 10/22/13 8:34 AM, Adrian Hunter wrote:
> +static int process_attr(struct perf_tool *tool, union perf_event *event,
> +			struct perf_evlist **pevlist)
> +{
> +	struct perf_script *scr = container_of(tool, struct perf_script, tool);
> +	struct perf_evlist *evlist;
> +	struct perf_evsel *evsel, *pos;
> +	int err;
> +
> +	err = perf_event__process_attr(tool, event, pevlist);
> +	if (err)
> +		return err;
> +
> +	evlist = *pevlist;
> +	evsel = perf_evlist__last(*pevlist);

This assumes new entries are added to the end of evlist in 
perf_event__process_attr. Would be better to change it to return the 
newly created evsel so you don't need to look it up after adding it.

> +
> +	if (evsel->attr.type >= PERF_TYPE_MAX)
> +		return 0;
> +
> +	list_for_each_entry(pos, &evlist->entries, node) {
> +		if (pos->attr.type == evsel->attr.type && pos != evsel)
> +			return 0;
> +	}

What's the point of this loop?

David