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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-14 10:08:16 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-15 16:33:57 -0300 |
| commit | 9865ea8ab31f2e56be59125099ee251ce573f293 (patch) | |
| tree | a1d8ff2020f73b077815e136a180c889f720e5c6 | |
| parent | perf annotate: Fix sample events lost in stdio mode (diff) | |
| download | linux-dev-9865ea8ab31f2e56be59125099ee251ce573f293.tar.xz linux-dev-9865ea8ab31f2e56be59125099ee251ce573f293.zip | |
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>
| -rw-r--r-- | tools/perf/util/evlist.c | 19 | ||||
| -rw-r--r-- | tools/perf/util/evlist.h | 2 |
2 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index f1c79ecf8107..d29a8a118973 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -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; +} diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index b695ffaae519..a8b97b50cceb 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -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 */ |