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perf pmu: Improve error messages for missing PMUs 

When a PMU is missing print a better error message mentioning
the missing PMU.

% mkdir empty
% mount --bind empty /sys/devices/msr
% perf stat -M Summary true
event syntax error: '{inst_retired.any,cycles}:W,{cpu_clk_unhalted.thread}:W,{inst_retired.any}:W,{cpu_clk_unhalted.ref_tsc,msr/tsc/}:W,{fp_comp_ops_exe.sse_scalar..'
                     \___ Cannot find PMU `msr'. Missing kernel support?

It still cannot find the right column for aliases, but it's already a vast improvement.

v2: Check asprintf

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170913215006.32222-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2017-09-13 14:50:06 -07:00 committed by Arnaldo Carvalho de Melo
parent 75e45e4320
commit 333b566559
3 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -477,7 +477,7 @@ int metricgroup__parse_groups(const struct option *opt,
memset(&parse_error, 0, sizeof(struct parse_events_error));
ret = parse_events(perf_evlist, extra_events.buf, &parse_error);
if (ret) {
pr_err("Cannot set up events %s\n", extra_events.buf);
parse_events_print_error(&parse_error, extra_events.buf);
goto out;
}
strbuf_release(&extra_events);

18
tools/perf/util/parse-events.c
View File

@ -1219,11 +1219,17 @@ static int __parse_events_add_pmu(struct parse_events_state *parse_state,
struct perf_pmu_info info;
struct perf_pmu *pmu;
struct perf_evsel *evsel;
struct parse_events_error *err = parse_state->error;
LIST_HEAD(config_terms);
pmu = perf_pmu__find(name);
if (!pmu)
if (!pmu) {
if (asprintf(&err->str,
"Cannot find PMU `%s'. Missing kernel support?",
name) < 0)
err->str = NULL;
return -EINVAL;
}
if (pmu->default_config) {
memcpy(&attr, pmu->default_config,
@ -1733,8 +1739,8 @@ static int get_term_width(void)
return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
}
static void parse_events_print_error(struct parse_events_error *err,
const char *event)
void parse_events_print_error(struct parse_events_error *err,
const char *event)
{
const char *str = "invalid or unsupported event: ";
char _buf[MAX_WIDTH];
@ -1789,8 +1795,6 @@ static void parse_events_print_error(struct parse_events_error *err,
zfree(&err->str);
zfree(&err->help);
}
fprintf(stderr, "Run 'perf list' for a list of valid events\n");
}
#undef MAX_WIDTH
@ -1802,8 +1806,10 @@ int parse_events_option(const struct option *opt, const char *str,
struct parse_events_error err = { .idx = 0, };
int ret = parse_events(evlist, str, &err);
if (ret)
if (ret) {
parse_events_print_error(&err, str);
fprintf(stderr, "Run 'perf list' for a list of valid events\n");
}
return ret;
}

3
tools/perf/util/parse-events.h
View File

@ -202,6 +202,9 @@ int is_valid_tracepoint(const char *event_string);
int valid_event_mount(const char *eventfs);
char *parse_events_formats_error_string(char *additional_terms);
void parse_events_print_error(struct parse_events_error *err,
const char *event);
#ifdef HAVE_LIBELF_SUPPORT
/*
* If the probe point starts with '%',