Re: [PATCH v3 12/27] perf parse-events: Support no alias assigned event inside hybrid PMU

Jiri Olsa
2021-04-15T19:39:33Z

On Thu, Apr 15, 2021 at 10:53:33PM +0800, Jin, Yao wrote:

SNIP

>
> With my current code,
>
> static int parse_events__with_hybrid_pmu(struct parse_events_state *parse_state,
> const char *str, char *pmu_name,
> struct list_head *list)
> {
> struct parse_events_state ps = {
> .list = LIST_HEAD_INIT(ps.list),
> .stoken = PE_START_EVENTS,
> .pmu_name = pmu_name,
> .idx = parse_state->idx,
> };
> int ret;
>
> ret = parse_events__scanner(str, &ps);
> perf_pmu__parse_cleanup();
>
> if (!ret) {
> if (!list_empty(&ps.list)) {
> list_splice(&ps.list, list);
> parse_state->idx = ps.idx;
> }
> }
>
> return ret;
> }
>
> The new created evsels are added to the tail of list (ps.list) and ps.list
> is joined to the list (the parameter 'list').
>
> If we want to reuse the __parse_events(), we may need to:
>
> struct evlist *evlist = evlist__new();

there's the original evlist pointer passed to the initial parser
that we should use no?

>
> __parse_events(evlist, str, NULL, NULL);
> Add the evsels in evlist to the tail of list (the parameter 'list')
> evlist__delete(evlist);
>
> Is my understanding correct?
>
> Yes, we have to change the interface of __parse_events() by adding a new
> parameter 'pmu_name', which will bring much more changes. I agree to make
> this change in follow-up patches.

let's check on this over the next version

thanks,
jirka