diff options
Diffstat (limited to 'tools/perf/util')
| -rw-r--r-- | tools/perf/util/debug.h | 1 | ||||
| -rw-r--r-- | tools/perf/util/evsel.c | 49 | ||||
| -rw-r--r-- | tools/perf/util/evsel.h | 3 |
3 files changed, 52 insertions, 1 deletions
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h index 6e2667fb821..efbd98805ad 100644 --- a/tools/perf/util/debug.h +++ b/tools/perf/util/debug.h @@ -16,6 +16,5 @@ void trace_event(union perf_event *event); int ui__error(const char *format, ...) __attribute__((format(printf, 1, 2))); int ui__warning(const char *format, ...) __attribute__((format(printf, 1, 2))); -int ui__error_paranoid(void); #endif /* __PERF_DEBUG_H */ diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 0c88e5c12da..e45332d08a5 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1406,3 +1406,52 @@ bool perf_evsel__fallback(struct perf_evsel *evsel, int err, return false; } + +int perf_evsel__open_strerror(struct perf_evsel *evsel, + struct perf_target *target, + int err, char *msg, size_t size) +{ + switch (err) { + case EPERM: + case EACCES: + return scnprintf(msg, size, "%s", + "You may not have permission to collect %sstats.\n" + "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n" + " -1 - Not paranoid at all\n" + " 0 - Disallow raw tracepoint access for unpriv\n" + " 1 - Disallow cpu events for unpriv\n" + " 2 - Disallow kernel profiling for unpriv", + target->system_wide ? "system-wide " : ""); + case ENOENT: + return scnprintf(msg, size, "The %s event is not supported.", + perf_evsel__name(evsel)); + case EMFILE: + return scnprintf(msg, size, "%s", + "Too many events are opened.\n" + "Try again after reducing the number of events."); + case ENODEV: + if (target->cpu_list) + return scnprintf(msg, size, "%s", + "No such device - did you specify an out-of-range profile CPU?\n"); + break; + case EOPNOTSUPP: + if (evsel->attr.precise_ip) + return scnprintf(msg, size, "%s", + "\'precise\' request may not be supported. Try removing 'p' modifier."); +#if defined(__i386__) || defined(__x86_64__) + if (evsel->attr.type == PERF_TYPE_HARDWARE) + return scnprintf(msg, size, "%s", + "No hardware sampling interrupt available.\n" + "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it."); +#endif + break; + default: + break; + } + + return scnprintf(msg, size, + "The sys_perf_event_open() syscall returned with %d (%s) for event (%s). \n" + "/bin/dmesg may provide additional information.\n" + "No CONFIG_PERF_EVENTS=y kernel support configured?\n", + err, strerror(err), perf_evsel__name(evsel)); +} diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 26d8cfd86e0..c68d1b82e84 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -254,4 +254,7 @@ int perf_evsel__fprintf(struct perf_evsel *evsel, bool perf_evsel__fallback(struct perf_evsel *evsel, int err, char *msg, size_t msgsize); +int perf_evsel__open_strerror(struct perf_evsel *evsel, + struct perf_target *target, + int err, char *msg, size_t size); #endif /* __PERF_EVSEL_H */ |