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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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54
tools/perf/builtin-record.c
View File

@ -224,7 +224,7 @@ static bool perf_evlist__equal(struct perf_evlist *evlist,
static int perf_record__open(struct perf_record *rec) static int perf_record__open(struct perf_record *rec)
{ {
char msg[128]; char msg[512];
struct perf_evsel *pos; struct perf_evsel *pos;
struct perf_evlist *evlist = rec->evlist; struct perf_evlist *evlist = rec->evlist;
struct perf_session *session = rec->session; struct perf_session *session = rec->session;
@ -234,60 +234,18 @@ static int perf_record__open(struct perf_record *rec)
perf_evlist__config(evlist, opts); perf_evlist__config(evlist, opts);
list_for_each_entry(pos, &evlist->entries, node) { list_for_each_entry(pos, &evlist->entries, node) {
struct perf_event_attr *attr = &pos->attr;
try_again: try_again:
if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) { if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) {
int err = errno; if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
if (err == EPERM || err == EACCES) {
ui__error_paranoid();
rc = -err;
goto out;
} else if (err == ENODEV && opts->target.cpu_list) {
pr_err("No such device - did you specify"
" an out-of-range profile CPU?\n");
rc = -err;
goto out;
}
if (perf_evsel__fallback(pos, err, msg, sizeof(msg))) {
if (verbose) if (verbose)
ui__warning("%s\n", msg); ui__warning("%s\n", msg);
goto try_again; goto try_again;
} }
if (err == ENOENT) { rc = -errno;
ui__error("The %s event is not supported.\n", perf_evsel__open_strerror(pos, &opts->target,
perf_evsel__name(pos)); errno, msg, sizeof(msg));
rc = -err; ui__error("%s\n", msg);
goto out;
} else if ((err == EOPNOTSUPP) && (attr->precise_ip)) {
ui__error("\'precise\' request may not be supported. "
"Try removing 'p' modifier\n");
rc = -err;
goto out;
}
printf("\n");
error("sys_perf_event_open() syscall returned with %d "
"(%s) for event %s. /bin/dmesg may provide "
"additional information.\n",
err, strerror(err), perf_evsel__name(pos));
#if defined(__i386__) || defined(__x86_64__)
if (attr->type == PERF_TYPE_HARDWARE &&
err == EOPNOTSUPP) {
pr_err("No hardware sampling interrupt available."
" No APIC? If so then you can boot the kernel"
" with the \"lapic\" boot parameter to"
" force-enable it.\n");
rc = -err;
goto out;
}
#endif
pr_err("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
rc = -err;
goto out; goto out;
} }
} }

16
tools/perf/builtin-stat.c
View File

@ -247,6 +247,7 @@ static int read_counter(struct perf_evsel *counter)
static int __run_perf_stat(int argc __maybe_unused, const char **argv) static int __run_perf_stat(int argc __maybe_unused, const char **argv)
{ {
char msg[512];
unsigned long long t0, t1; unsigned long long t0, t1;
struct perf_evsel *counter; struct perf_evsel *counter;
int status = 0; int status = 0;
@ -324,20 +325,13 @@ static int __run_perf_stat(int argc __maybe_unused, const char **argv)
continue; continue;
} }
if (errno == EPERM || errno == EACCES) { perf_evsel__open_strerror(counter, &target,
error("You may not have permission to collect %sstats.\n" errno, msg, sizeof(msg));
"\t Consider tweaking" ui__error("%s\n", msg);
" /proc/sys/kernel/perf_event_paranoid or running as root.",
target.system_wide ? "system-wide " : "");
} else {
error("open_counter returned with %d (%s). "
"/bin/dmesg may provide additional information.\n",
errno, strerror(errno));
}
if (child_pid != -1) if (child_pid != -1)
kill(child_pid, SIGTERM); kill(child_pid, SIGTERM);
pr_err("Not all events could be opened.\n");
return -1; return -1;
} }
counter->supported = true; counter->supported = true;

34
tools/perf/builtin-top.c
View File

@ -892,7 +892,7 @@ static void perf_top__mmap_read(struct perf_top *top)
static void perf_top__start_counters(struct perf_top *top) static void perf_top__start_counters(struct perf_top *top)
{ {
char msg[128]; char msg[512];
struct perf_evsel *counter; struct perf_evsel *counter;
struct perf_evlist *evlist = top->evlist; struct perf_evlist *evlist = top->evlist;
struct perf_record_opts *opts = &top->record_opts; struct perf_record_opts *opts = &top->record_opts;
@ -900,42 +900,18 @@ static void perf_top__start_counters(struct perf_top *top)
perf_evlist__config(evlist, opts); perf_evlist__config(evlist, opts);
list_for_each_entry(counter, &evlist->entries, node) { list_for_each_entry(counter, &evlist->entries, node) {
struct perf_event_attr *attr = &counter->attr;
try_again: try_again:
if (perf_evsel__open(counter, top->evlist->cpus, if (perf_evsel__open(counter, top->evlist->cpus,
top->evlist->threads) < 0) { top->evlist->threads) < 0) {
int err = errno; if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
if (err == EPERM || err == EACCES) {
ui__error_paranoid();
goto out_err;
}
if (perf_evsel__fallback(counter, err, msg, sizeof(msg))) {
if (verbose) if (verbose)
ui__warning("%s\n", msg); ui__warning("%s\n", msg);
goto try_again; goto try_again;
} }
if (err == ENOENT) { perf_evsel__open_strerror(counter, &opts->target,
ui__error("The %s event is not supported.\n", errno, msg, sizeof(msg));
perf_evsel__name(counter)); ui__error("%s\n", msg);
goto out_err;
} else if (err == EMFILE) {
ui__error("Too many events are opened.\n"
"Try again after reducing the number of events\n");
goto out_err;
} else if ((err == EOPNOTSUPP) && (attr->precise_ip)) {
ui__error("\'precise\' request may not be supported. "
"Try removing 'p' modifier\n");
goto out_err;
}
ui__error("The sys_perf_event_open() syscall "
"returned with %d (%s). /bin/dmesg "
"may provide additional information.\n"
"No CONFIG_PERF_EVENTS=y kernel support "
"configured?\n", err, strerror(err));
goto out_err; goto out_err;
} }
} }

11
tools/perf/ui/util.c
View File

@ -52,17 +52,6 @@ int ui__warning(const char *format, ...)
return ret; return ret;
} }
int ui__error_paranoid(void)
{
return ui__error("Permission error - are you root?\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\n");
}
/** /**
* perf_error__register - Register error logging functions * perf_error__register - Register error logging functions
* @eops: The pointer to error logging function struct * @eops: The pointer to error logging function struct

1
tools/perf/util/debug.h
View File

@ -16,6 +16,5 @@ void trace_event(union perf_event *event);
int ui__error(const char *format, ...) __attribute__((format(printf, 1, 2))); int ui__error(const char *format, ...) __attribute__((format(printf, 1, 2)));
int ui__warning(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 */ #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; 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, bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
char *msg, size_t msgsize); 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 */ #endif /* __PERF_EVSEL_H */