linux-kernel - Re: [PATCH v4 12/25] perf parse-events: Support event inside hybrid pmu

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Date:   Wed, 21 Apr 2021 20:29:27 +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 v4 12/25] perf parse-events: Support event inside hybrid
 pmu

On Fri, Apr 16, 2021 at 10:05:04PM +0800, Jin Yao wrote:

SNIP

> ---
> v4:
>  - New in v4.
> 
>  tools/perf/util/parse-events.c | 55 ++++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index f69475a158bb..bd3fd722b4ac 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -38,6 +38,7 @@
>  #include "util/event.h"
>  #include "util/pfm.h"
>  #include "util/parse-events-hybrid.h"
> +#include "util/pmu-hybrid.h"
>  #include "perf.h"
>  
>  #define MAX_NAME_LEN 100
> @@ -48,6 +49,9 @@ extern int parse_events_debug;
>  int parse_events_parse(void *parse_state, void *scanner);
>  static int get_config_terms(struct list_head *head_config,
>  			    struct list_head *head_terms __maybe_unused);
> +static int parse_events__with_hybrid_pmu(struct parse_events_state *parse_state,
> +					 const char *str, char *pmu_name,
> +					 struct list_head *list, bool *parsed);
>  
>  static struct perf_pmu_event_symbol *perf_pmu_events_list;
>  /*
> @@ -1567,6 +1571,27 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
>  	if (pmu->default_config && get_config_chgs(pmu, head_config, &config_terms))
>  		return -ENOMEM;
>  
> +	if (!parse_state->fake_pmu && head_config &&
> +	    perf_pmu__is_hybrid(name)) {
> +		struct parse_events_term *term;
> +		bool parsed;
> +		int ret;
> +
> +		term = list_first_entry(head_config, struct parse_events_term,
> +					list);

you need to test that there's something in the head_config first,
and I thought you wanted to check that there's just 1 term, right?
(you could check the next pointer == head_config)

also please move this to separated function

> +		if (term && term->config && strcmp(term->config, "event")) {
> +			ret = parse_events__with_hybrid_pmu(parse_state,
> +							    term->config, name,
> +							    list, &parsed);
> +			/*
> +			 * If the string inside the pmu can't be parsed,
> +			 * don't return, try next steps.
> +			 */
> +			if (parsed)
> +				return ret;

so if the function fails we ignore the return value,
because parsed is set only for ret == 0, so I think we
don't need 'parsed' param and we could make parse_events__with_hybrid_pmu
return 0 when we found some event and let it go through otherwise


> +		}
> +	}
> +
>  	if (!parse_state->fake_pmu && perf_pmu__config(pmu, &attr, head_config, parse_state->error)) {
>  		struct evsel_config_term *pos, *tmp;
>  
> @@ -1585,6 +1610,9 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
>  	if (!evsel)
>  		return -ENOMEM;
>  
> +	if (evsel->name)
> +		evsel->use_config_name = true;

should this go to:
 perf stat: Uniquify hybrid event name
?

thanks,
jirka

> +
>  	evsel->pmu_name = name ? strdup(name) : NULL;
>  	evsel->use_uncore_alias = use_uncore_alias;
>  	evsel->percore = config_term_percore(&evsel->config_terms);
> @@ -2180,6 +2208,33 @@ int parse_events_terms(struct list_head *terms, const char *str)
>  	return ret;
>  }
>  
> +static int parse_events__with_hybrid_pmu(struct parse_events_state *parse_state,
> +					 const char *str, char *pmu_name,
> +					 struct list_head *list, bool *parsed)
> +{
> +	struct parse_events_state ps = {
> +		.list            = LIST_HEAD_INIT(ps.list),
> +		.stoken          = PE_START_EVENTS,
> +		.hybrid_pmu_name = pmu_name,
> +		.idx             = parse_state->idx,
> +	};
> +	int ret;
> +
> +	*parsed = false;
> +	ret = parse_events__scanner(str, &ps);
> +	perf_pmu__parse_cleanup();
> +
> +	if (!ret) {
> +		if (!list_empty(&ps.list)) {
> +			*parsed = true;
> +			list_splice(&ps.list, list);
> +			parse_state->idx = ps.idx;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
>  int __parse_events(struct evlist *evlist, const char *str,
>  		   struct parse_events_error *err, struct perf_pmu *fake_pmu)
>  {
> -- 
> 2.17.1
>