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

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Message-ID: <YHiWaDYzC9xEwLcp@krava>
Date:   Thu, 15 Apr 2021 21:39:20 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 12/27] perf parse-events: Support no alias assigned
 event inside hybrid PMU

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