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perf parse: Report initial event parsing error 

Record the first event parsing error and report. Implementing feedback
from Jiri Olsa:

  https://lkml.org/lkml/2019/10/28/680

An example error is:

  $ tools/perf/perf stat -e c/c/
  WARNING: multiple event parsing errors
  event syntax error: 'c/c/'
                         \___ unknown term

  valid terms: event,filter_rem,filter_opc0,edge,filter_isoc,filter_tid,filter_loc,filter_nc,inv,umask,filter_opc1,tid_en,thresh,filter_all_op,filter_not_nm,filter_state,filter_nm,config,config1,config2,name,period,percore

Initial error:

  event syntax error: 'c/c/'
                      \___ Cannot find PMU `c'. Missing kernel support?
  Run 'perf list' for a list of valid events

   Usage: perf stat [<options>] [<command>]

      -e, --event <event>   event selector. use 'perf list' to list available events

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20191116074652.9960-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2019-11-15 23:46:52 -08:00 committed by Arnaldo Carvalho de Melo
parent cb40273085
commit a910e4666d
7 changed files with 80 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/perf/arch/powerpc/util/kvm-stat.c
View File

@ -113,10 +113,10 @@ static int is_tracepoint_available(const char *str, struct evlist *evlist)
struct parse_events_error err;
int ret;
err.str = NULL;
bzero(&err, sizeof(err));
ret = parse_events(evlist, str, &err);
if (err.str)
pr_err("%s : %s\n", str, err.str);
parse_events_print_error(&err, "tracepoint");
return ret;
}

2
tools/perf/builtin-stat.c
View File

@ -1307,6 +1307,7 @@ static int add_default_attributes(void)
if (stat_config.null_run)
return 0;
bzero(&errinfo, sizeof(errinfo));
if (transaction_run) {
/* Handle -T as -M transaction. Once platform specific metrics
* support has been added to the json files, all archictures
@ -1364,6 +1365,7 @@ static int add_default_attributes(void)
return -1;
}
if (err) {
parse_events_print_error(&errinfo, smi_cost_attrs);
fprintf(stderr, "Cannot set up SMI cost events\n");
return -1;
}

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

@ -3016,11 +3016,18 @@ static bool evlist__add_vfs_getname(struct evlist *evlist)
{
bool found = false;
struct evsel *evsel, *tmp;
struct parse_events_error err = { .idx = 0, };
int ret = parse_events(evlist, "probe:vfs_getname*", &err);
struct parse_events_error err;
int ret;
if (ret)
bzero(&err, sizeof(err));
ret = parse_events(evlist, "probe:vfs_getname*", &err);
if (ret) {
free(err.str);
free(err.help);
free(err.first_str);
free(err.first_help);
return false;
}
evlist__for_each_entry_safe(evlist, evsel, tmp) {
if (!strstarts(perf_evsel__name(evsel), "probe:vfs_getname"))
@ -4832,8 +4839,9 @@ int cmd_trace(int argc, const char **argv)
* wrong in more detail.
*/
if (trace.perfconfig_events != NULL) {
struct parse_events_error parse_err = { .idx = 0, };
struct parse_events_error parse_err;
bzero(&parse_err, sizeof(parse_err));
err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err);
if (err) {
parse_events_print_error(&parse_err, trace.perfconfig_events);

3
tools/perf/tests/parse-events.c
View File

@ -1768,10 +1768,11 @@ static struct terms_test test__terms[] = {
static int test_event(struct evlist_test *e)
{
struct parse_events_error err = { .idx = 0, };
struct parse_events_error err;
struct evlist *evlist;
int ret;
bzero(&err, sizeof(err));
if (e->valid && !e->valid()) {
pr_debug("... SKIP");
return 0;

2
tools/perf/util/metricgroup.c
View File

@ -523,7 +523,7 @@ int metricgroup__parse_groups(const struct option *opt,
if (ret)
return ret;
pr_debug("adding %s\n", extra_events.buf);
memset(&parse_error, 0, sizeof(struct parse_events_error));
bzero(&parse_error, sizeof(parse_error));
ret = parse_events(perf_evlist, extra_events.buf, &parse_error);
if (ret) {
parse_events_print_error(&parse_error, extra_events.buf);

64
tools/perf/util/parse-events.c
View File

@ -189,12 +189,29 @@ void parse_events__handle_error(struct parse_events_error *err, int idx,
free(help);
return;
}
WARN_ONCE(err->str, "WARNING: multiple event parsing errors\n");
switch (err->num_errors) {
case 0:
err->idx = idx;
err->str = str;
err->help = help;
break;
case 1:
err->first_idx = err->idx;
err->idx = idx;
err->first_str = err->str;
err->str = str;
err->first_help = err->help;
err->help = help;
break;
default:
WARN_ONCE(1, "WARNING: multiple event parsing errors\n");
free(err->str);
err->str = str;
free(err->help);
err->help = help;
break;
}
err->num_errors++;
}
struct tracepoint_path *tracepoint_id_to_path(u64 config)
@ -1349,7 +1366,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
if (asprintf(&err_str,
"Cannot find PMU `%s'. Missing kernel support?",
name) >= 0)
parse_events__handle_error(err, -1, err_str, NULL);
parse_events__handle_error(err, 0, err_str, NULL);
return -EINVAL;
}
@ -2007,15 +2024,14 @@ static int get_term_width(void)
return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
}
void parse_events_print_error(struct parse_events_error *err,
const char *event)
static void __parse_events_print_error(int err_idx, const char *err_str,
const char *err_help, const char *event)
{
const char *str = "invalid or unsupported event: ";
char _buf[MAX_WIDTH];
char *buf = (char *) event;
int idx = 0;
if (err->str) {
if (err_str) {
/* -2 for extra '' in the final fprintf */
int width = get_term_width() - 2;
int len_event = strlen(event);
@ -2038,8 +2054,8 @@ void parse_events_print_error(struct parse_events_error *err,
buf = _buf;
/* We're cutting from the beginning. */
if (err->idx > max_err_idx)
cut = err->idx - max_err_idx;
if (err_idx > max_err_idx)
cut = err_idx - max_err_idx;
strncpy(buf, event + cut, max_len);
@ -2052,16 +2068,33 @@ void parse_events_print_error(struct parse_events_error *err,
buf[max_len] = 0;
}
idx = len_str + err->idx - cut;
idx = len_str + err_idx - cut;
}
fprintf(stderr, "%s'%s'\n", str, buf);
if (idx) {
fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err->str);
if (err->help)
fprintf(stderr, "\n%s\n", err->help);
fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err_str);
if (err_help)
fprintf(stderr, "\n%s\n", err_help);
}
}
void parse_events_print_error(struct parse_events_error *err,
const char *event)
{
if (!err->num_errors)
return;
__parse_events_print_error(err->idx, err->str, err->help, event);
zfree(&err->str);
zfree(&err->help);
if (err->num_errors > 1) {
fputs("\nInitial error:\n", stderr);
__parse_events_print_error(err->first_idx, err->first_str,
err->first_help, event);
zfree(&err->first_str);
zfree(&err->first_help);
}
}
@ -2071,8 +2104,11 @@ int parse_events_option(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct evlist *evlist = *(struct evlist **)opt->value;
struct parse_events_error err = { .idx = 0, };
int ret = parse_events(evlist, str, &err);
struct parse_events_error err;
int ret;
bzero(&err, sizeof(err));
ret = parse_events(evlist, str, &err);
if (ret) {
parse_events_print_error(&err, str);

4
tools/perf/util/parse-events.h
View File

@ -110,9 +110,13 @@ struct parse_events_term {
};
struct parse_events_error {
int num_errors; /* number of errors encountered */
int idx; /* index in the parsed string */
char *str; /* string to display at the index */
char *help; /* optional help string */
int first_idx;/* as above, but for the first encountered error */
char *first_str;
char *first_help;
};
struct parse_events_state {