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perf evsel: Introduce perf_evsel__open_strerror method

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That consolidates the error messages in 'record', 'stat' and 'top', that
now get a consistent set of messages and allow other tools to use the
new method to report problems using whatever UI toolkit.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-1cudb7wl996kz7ilz83ctvhr@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2012-12-13 15:10:58 -03:00
parent c0a54341c0
commit 56e52e8536
7 changed files with 68 additions and 100 deletions
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1
tools/perf/util/debug.h
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@@ -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 */

49
tools/perf/util/evsel.c
View File

@@ -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));
}

3
tools/perf/util/evsel.h
View File

@@ -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 */