On a CPU like skylakex an uncore_iio_0 PMU may alias with
uncore_iio_free_running_0. The latter PMU doesn't support fc_mask as a
parameter and so pmu_config_term fails. Typically parse_events_add_pmu
is called in a loop where if one alias succeeds errors are ignored,
however, if multiple errors occur parse_events__handle_error will
currently give a WARN_ONCE.
This change removes the WARN_ONCE in parse_events__handle_error and
makes it a pr_debug. It adds verbose messages to parse_events_add_pmu
warning that non-fatal errors may occur, while giving details on the pmu
and config terms for useful context. pmu_config_term is altered so the
failing term and pmu are present in the case of the 'unknown term' error
which makes spotting the free_running case more straightforward.
Before:
$ perf --debug verbose=3 stat -M llc_misses.pcie_read sleep 1
Using CPUID GenuineIntel-6-55-4
metric expr unc_iio_data_req_of_cpu.mem_read.part0 + unc_iio_data_req_of_cpu.mem_read.part1 + unc_iio_data_req_of_cpu.mem_read.part2 + unc_iio_data_req_of_cpu.mem_read.part3 for LLC_MISSES.PCIE_READ
found event unc_iio_data_req_of_cpu.mem_read.part0
found event unc_iio_data_req_of_cpu.mem_read.part1
found event unc_iio_data_req_of_cpu.mem_read.part2
found event unc_iio_data_req_of_cpu.mem_read.part3
metric expr unc_iio_data_req_of_cpu.mem_read.part0 + unc_iio_data_req_of_cpu.mem_read.part1 + unc_iio_data_req_of_cpu.mem_read.part2 + unc_iio_data_req_of_cpu.mem_read.part3 for LLC_MISSES.PCIE_READ
found event unc_iio_data_req_of_cpu.mem_read.part0
found event unc_iio_data_req_of_cpu.mem_read.part1
found event unc_iio_data_req_of_cpu.mem_read.part2
found event unc_iio_data_req_of_cpu.mem_read.part3
adding {unc_iio_data_req_of_cpu.mem_read.part0,unc_iio_data_req_of_cpu.mem_read.part1,unc_iio_data_req_of_cpu.mem_read.part2,unc_iio_data_req_of_cpu.mem_read.part3}:W,{unc_iio_data_req_of_cpu.mem_read.part0,unc_iio_data_req_of_cpu.mem_read.part1,unc_iio_data_req_of_cpu.mem_read.part2,unc_iio_data_req_of_cpu.mem_read.part3}:W
intel_pt default config: tsc,mtc,mtc_period=3,psb_period=3,pt,branch
WARNING: multiple event parsing errors
...
Invalid event/parameter 'fc_mask'
...
After:
$ perf --debug verbose=3 stat -M llc_misses.pcie_read sleep 1
Using CPUID GenuineIntel-6-55-4
metric expr unc_iio_data_req_of_cpu.mem_read.part0 + unc_iio_data_req_of_cpu.mem_read.part1 + unc_iio_data_req_of_cpu.mem_read.part2 + unc_iio_data_req_of_cpu.mem_read.part3 for LLC_MISSES.PCIE_READ
found event unc_iio_data_req_of_cpu.mem_read.part0
found event unc_iio_data_req_of_cpu.mem_read.part1
found event unc_iio_data_req_of_cpu.mem_read.part2
found event unc_iio_data_req_of_cpu.mem_read.part3
metric expr unc_iio_data_req_of_cpu.mem_read.part0 + unc_iio_data_req_of_cpu.mem_read.part1 + unc_iio_data_req_of_cpu.mem_read.part2 + unc_iio_data_req_of_cpu.mem_read.part3 for LLC_MISSES.PCIE_READ
found event unc_iio_data_req_of_cpu.mem_read.part0
found event unc_iio_data_req_of_cpu.mem_read.part1
found event unc_iio_data_req_of_cpu.mem_read.part2
found event unc_iio_data_req_of_cpu.mem_read.part3
adding {unc_iio_data_req_of_cpu.mem_read.part0,unc_iio_data_req_of_cpu.mem_read.part1,unc_iio_data_req_of_cpu.mem_read.part2,unc_iio_data_req_of_cpu.mem_read.part3}:W,{unc_iio_data_req_of_cpu.mem_read.part0,unc_iio_data_req_of_cpu.mem_read.part1,unc_iio_data_req_of_cpu.mem_read.part2,unc_iio_data_req_of_cpu.mem_read.part3}:W
intel_pt default config: tsc,mtc,mtc_period=3,psb_period=3,pt,branch
Attempting to add event pmu 'uncore_iio_free_running_5' with 'unc_iio_data_req_of_cpu.mem_read.part0,' that may result in non-fatal errors
After aliases, add event pmu 'uncore_iio_free_running_5' with 'fc_mask,ch_mask,umask,event,' that may result in non-fatal errors
Attempting to add event pmu 'uncore_iio_free_running_3' with 'unc_iio_data_req_of_cpu.mem_read.part0,' that may result in non-fatal errors
After aliases, add event pmu 'uncore_iio_free_running_3' with 'fc_mask,ch_mask,umask,event,' that may result in non-fatal errors
Attempting to add event pmu 'uncore_iio_free_running_1' with 'unc_iio_data_req_of_cpu.mem_read.part0,' that may result in non-fatal errors
After aliases, add event pmu 'uncore_iio_free_running_1' with 'fc_mask,ch_mask,umask,event,' that may result in non-fatal errors
Multiple errors dropping message: unknown term 'fc_mask' for pmu 'uncore_iio_free_running_3' (valid terms: event,umask,config,config1,config2,name,period,percore)
...
So before you see a 'WARNING: multiple event parsing errors' and
'Invalid event/parameter'. After you see 'Attempting... that may result
in non-fatal errors' then 'Multiple errors...' with details that
'fc_mask' wasn't known to a free running counter. While not completely
clean, this makes it clearer that an error hasn't really occurred.
v2. addresses review feedback from Jiri Olsa <jolsa@redhat.com>.
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20200513220635.54700-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
size_t priv_size;
};
-static int intel_pt_parse_terms_with_default(struct list_head *formats,
+static int intel_pt_parse_terms_with_default(const char *pmu_name,
+ struct list_head *formats,
const char *str,
u64 *config)
{
goto out_free;
attr.config = *config;
- err = perf_pmu__config_terms(formats, &attr, terms, true, NULL);
+ err = perf_pmu__config_terms(pmu_name, formats, &attr, terms, true,
+ NULL);
if (err)
goto out_free;
return err;
}
-static int intel_pt_parse_terms(struct list_head *formats, const char *str,
- u64 *config)
+static int intel_pt_parse_terms(const char *pmu_name, struct list_head *formats,
+ const char *str, u64 *config)
{
*config = 0;
- return intel_pt_parse_terms_with_default(formats, str, config);
+ return intel_pt_parse_terms_with_default(pmu_name, formats, str,
+ config);
}
static u64 intel_pt_masked_bits(u64 mask, u64 bits)
pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);
- intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format, buf,
+ &config);
return config;
}
if (priv_size != ptr->priv_size)
return -EINVAL;
- intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
- intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
- &noretcomp_bit);
- intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
+ "tsc", &tsc_bit);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
+ "noretcomp", &noretcomp_bit);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
+ "mtc", &mtc_bit);
mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
"mtc_period");
- intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
+ "cyc", &cyc_bit);
intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
}
}
- intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
+ intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
+ "tsc", &tsc_bit);
if (opts->full_auxtrace && (intel_pt_evsel->core.attr.config & tsc_bit))
have_timing_info = true;
if (ret)
break;
- ret = perf_pmu__config_terms(&formats, &attr, terms,
- false, NULL);
+ ret = perf_pmu__config_terms("perf-pmu-test", &formats, &attr,
+ terms, false, NULL);
if (ret)
break;
err->help = help;
break;
default:
- WARN_ONCE(1, "WARNING: multiple event parsing errors\n");
+ pr_debug("Multiple errors dropping message: %s (%s)\n",
+ err->str, err->help);
free(err->str);
err->str = str;
free(err->help);
bool use_uncore_alias;
LIST_HEAD(config_terms);
+ if (verbose > 1) {
+ fprintf(stderr, "Attempting to add event pmu '%s' with '",
+ name);
+ if (head_config) {
+ struct parse_events_term *term;
+
+ list_for_each_entry(term, head_config, list) {
+ fprintf(stderr, "%s,", term->config);
+ }
+ }
+ fprintf(stderr, "' that may result in non-fatal errors\n");
+ }
+
pmu = perf_pmu__find(name);
if (!pmu) {
char *err_str;
if (perf_pmu__check_alias(pmu, head_config, &info))
return -EINVAL;
+ if (verbose > 1) {
+ fprintf(stderr, "After aliases, add event pmu '%s' with '",
+ name);
+ if (head_config) {
+ struct parse_events_term *term;
+
+ list_for_each_entry(term, head_config, list) {
+ fprintf(stderr, "%s,", term->config);
+ }
+ }
+ fprintf(stderr, "' that may result in non-fatal errors\n");
+ }
+
/*
* Configure hardcoded terms first, no need to check
* return value when called with fail == 0 ;)
* Setup one of config[12] attr members based on the
* user input data - term parameter.
*/
-static int pmu_config_term(struct list_head *formats,
+static int pmu_config_term(const char *pmu_name,
+ struct list_head *formats,
struct perf_event_attr *attr,
struct parse_events_term *term,
struct list_head *head_terms,
format = pmu_find_format(formats, term->config);
if (!format) {
- if (verbose > 0)
- printf("Invalid event/parameter '%s'\n", term->config);
+ char *pmu_term = pmu_formats_string(formats);
+ char *unknown_term;
+ char *help_msg;
+
+ if (asprintf(&unknown_term,
+ "unknown term '%s' for pmu '%s'",
+ term->config, pmu_name) < 0)
+ unknown_term = NULL;
+ help_msg = parse_events_formats_error_string(pmu_term);
if (err) {
- char *pmu_term = pmu_formats_string(formats);
-
parse_events__handle_error(err, term->err_term,
- strdup("unknown term"),
- parse_events_formats_error_string(pmu_term));
- free(pmu_term);
+ unknown_term,
+ help_msg);
+ } else {
+ pr_debug("%s (%s)\n", unknown_term, help_msg);
+ free(unknown_term);
}
+ free(pmu_term);
return -EINVAL;
}
return 0;
}
-int perf_pmu__config_terms(struct list_head *formats,
+int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats,
struct perf_event_attr *attr,
struct list_head *head_terms,
bool zero, struct parse_events_error *err)
struct parse_events_term *term;
list_for_each_entry(term, head_terms, list) {
- if (pmu_config_term(formats, attr, term, head_terms,
+ if (pmu_config_term(pmu_name, formats, attr, term, head_terms,
zero, err))
return -EINVAL;
}
bool zero = !!pmu->default_config;
attr->type = pmu->type;
- return perf_pmu__config_terms(&pmu->format, attr, head_terms,
- zero, err);
+ return perf_pmu__config_terms(pmu->name, &pmu->format, attr,
+ head_terms, zero, err);
}
static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
struct list_head *head_terms,
struct parse_events_error *error);
-int perf_pmu__config_terms(struct list_head *formats,
+int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats,
struct perf_event_attr *attr,
struct list_head *head_terms,
bool zero, struct parse_events_error *error);