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perf stat: Print out hint for mixed PMU group error 

Perf doesn't support mixed events from different PMUs (except software
event) in a group. For this case, only "<not counted>" or "<not
supported>" are printed out. There is no hint which guides users to fix
the issue.

Checking the PMU type of events to determine if they are from the same
PMU. There may be false alarm for the checking. E.g. the core PMU has
different PMU type. But it should not happen often.

The false alarm can also be tolerated, because:

- It only happens on error path.
- It just provides a possible solution for the issue.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Agustin Vega-Frias <agustinv@codeaurora.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1524594014-79243-2-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2018-04-24 11:20:11 -07:00 committed by Arnaldo Carvalho de Melo
parent 292c34c102
commit 30060eaed7
1 changed files with 34 additions and 1 deletions
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35
tools/perf/builtin-stat.c
View File

@ -172,6 +172,7 @@ static bool interval_count;
static const char *output_name;
static int output_fd;
static int print_free_counters_hint;
static int print_mixed_hw_group_error;
struct perf_stat {
bool record;
@ -1126,6 +1127,30 @@ static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
}
static bool is_mixed_hw_group(struct perf_evsel *counter)
{
struct perf_evlist *evlist = counter->evlist;
u32 pmu_type = counter->attr.type;
struct perf_evsel *pos;
if (counter->nr_members < 2)
return false;
evlist__for_each_entry(evlist, pos) {
/* software events can be part of any hardware group */
if (pos->attr.type == PERF_TYPE_SOFTWARE)
continue;
if (pmu_type == PERF_TYPE_SOFTWARE) {
pmu_type = pos->attr.type;
continue;
}
if (pmu_type != pos->attr.type)
return true;
}
return false;
}
static void printout(int id, int nr, struct perf_evsel *counter, double uval,
char *prefix, u64 run, u64 ena, double noise,
struct runtime_stat *st)
@ -1178,8 +1203,11 @@ static void printout(int id, int nr, struct perf_evsel *counter, double uval,
counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
csv_sep);
if (counter->supported)
if (counter->supported) {
print_free_counters_hint = 1;
if (is_mixed_hw_group(counter))
print_mixed_hw_group_error = 1;
}
fprintf(stat_config.output, "%-*s%s",
csv_output ? 0 : unit_width,
@ -1757,6 +1785,11 @@ static void print_footer(void)
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"
" perf stat ...\n"
" echo 1 > /proc/sys/kernel/nmi_watchdog\n");
if (print_mixed_hw_group_error)
fprintf(output,
"The events in group usually have to be from "
"the same PMU. Try reorganizing the group.\n");
}
static void print_counters(struct timespec *ts, int argc, const char **argv)