From: Arnaldo Carvalho de Melo <[email protected]> commit 9865ea8ab31f2e56be59125099ee251ce573f293 upstream
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 <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Adrian Zaharia <[email protected]> --- tools/perf/util/evlist.c | 19 +++++++++++++++++++ tools/perf/util/evlist.h | 2 ++ 2 files changed, 21 insertions(+) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 98ae432470cd..9ffeeca4724f 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1988,3 +1988,22 @@ 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; +} diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 9298fce53ea3..84f745d4ef72 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -391,4 +391,6 @@ 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 */ -- 2.36.1
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