Commit 9865ea8a authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf evlist: Add a method to return the list of evsels as a string 



Add a 'scnprintf' method to obtain the list of evsels in a evlist as a
string, excluding the "dummy" event used for things like receiving
metadata events (PERF_RECORD_FORK, MMAP, etc) when synthesizing
preexisting threads.

Will be used to improve the error message for workload failure in 'perf
record.

Acked-by: default avatarIan Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20210414131628.2064862-2-acme@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 5676dba7

tools/perf/util/evlist.c

+19 −0
Original line number Diff line number Diff line
@@ -2138,3 +2138,22 @@ struct evsel *evlist__find_evsel(struct evlist *evlist, int idx) 
	}

	return NULL;

}



int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf)

{

	struct evsel *evsel;

	int printed = 0;



	evlist__for_each_entry(evlist, evsel) {

		if (evsel__is_dummy_event(evsel))

			continue;

		if (size > (strlen(evsel__name(evsel)) + (printed ? 2 : 1))) {

			printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "," : "", evsel__name(evsel));

		} else {

			printed += scnprintf(bf + printed, size - printed, "%s...", printed ? "," : "");

			break;

		}

	}



	return printed;

}

tools/perf/util/evlist.h

+2 −0
Original line number Diff line number Diff line
@@ -365,4 +365,6 @@ int evlist__ctlfd_ack(struct evlist *evlist); 
#define EVLIST_DISABLED_MSG "Events disabled\n"



struct evsel *evlist__find_evsel(struct evlist *evlist, int idx);



int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf);

#endif /* __PERF_EVLIST_H */