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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: Ian 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2021-04-14 10:08:16 -03:00
parent 5676dba708
commit 9865ea8ab3
2 changed files with 21 additions and 0 deletions
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19
tools/perf/util/evlist.c
View File

@ -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;
}

2
tools/perf/util/evlist.h
View File

@ -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 */