diff options
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/evlist.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index a7eb0eae9938..0f577162c699 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1624,7 +1624,7 @@ size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp) return printed + fprintf(fp, "\n"); } -int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, +int perf_evlist__strerror_open(struct perf_evlist *evlist, int err, char *buf, size_t size) { int printed, value; @@ -1652,7 +1652,25 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, "Hint:\tTry: 'sudo sh -c \"echo -1 > /proc/sys/kernel/perf_event_paranoid\"'\n" "Hint:\tThe current value is %d.", value); break; + case EINVAL: { + struct perf_evsel *first = perf_evlist__first(evlist); + int max_freq; + + if (sysctl__read_int("kernel/perf_event_max_sample_rate", &max_freq) < 0) + goto out_default; + + if (first->attr.sample_freq < (u64)max_freq) + goto out_default; + + printed = scnprintf(buf, size, + "Error:\t%s.\n" + "Hint:\tCheck /proc/sys/kernel/perf_event_max_sample_rate.\n" + "Hint:\tThe current value is %d and %" PRIu64 " is being requested.", + emsg, max_freq, first->attr.sample_freq); + break; + } default: +out_default: scnprintf(buf, size, "%s", emsg); break; } |