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

Jiri Olsa
2021-04-21T18:30:06Z

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
>