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perf stat: Only auto-merge events that are PMU aliases

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Peter reported that when he explicitely asked for multiple events with
the same name on the command line it got coalesced into just one line,
i.e.:

   # perf stat -e cycles -e cycles -e cycles usleep 1

   Performance counter stats for 'usleep 1':

         3,269,652      cycles

       0.000884123 seconds time elapsed

  #

And while there is the --no-merges option to disable that auto-merging,
this is a blunt change in behaviour for such explicit request, so change
the code so that this auto merging is done only when handling the multi
PMU aliases with the same name that introduced this coalescing,
restoring the previous behaviour for the explicit case:

  # perf stat -e cycles -e cycles -e cycles usleep 1

   Performance counter stats for 'usleep 1':

         1,472,837      cycles
         1,472,837      cycles
         1,472,837      cycles

       0.001764870 seconds time elapsed

  #

Reported-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 430daf2dc7 ("perf stat: Collapse identically named events")
Link: http://lkml.kernel.org/r/20170831184122.GK4831@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-08-31 15:32:18 -03:00
parent fc33dccba3
commit 63ce8449bc
3 changed files with 18 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -1257,7 +1257,7 @@ static bool collect_data(struct perf_evsel *counter,
if (counter->merged_stat)
return false;
cb(counter, data, true);
if (!no_merge)
if (!no_merge && counter->auto_merge_stats)
collect_all_aliases(counter, cb, data);
return true;
}

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

@ -131,6 +131,7 @@ struct perf_evsel {
bool cmdline_group_boundary;
struct list_head config_terms;
int bpf_fd;
bool auto_merge_stats;
bool merged_stat;
const char * metric_expr;
const char * metric_name;

24
tools/perf/util/parse-events.c
View File

@ -310,7 +310,7 @@ static struct perf_evsel *
__add_event(struct list_head *list, int *idx,
struct perf_event_attr *attr,
char *name, struct cpu_map *cpus,
struct list_head *config_terms)
struct list_head *config_terms, bool auto_merge_stats)
{
struct perf_evsel *evsel;
@ -324,6 +324,7 @@ __add_event(struct list_head *list, int *idx,
evsel->cpus = cpu_map__get(cpus);
evsel->own_cpus = cpu_map__get(cpus);
evsel->system_wide = !!cpus;
evsel->auto_merge_stats = auto_merge_stats;
if (name)
evsel->name = strdup(name);
@ -339,7 +340,7 @@ static int add_event(struct list_head *list, int *idx,
struct perf_event_attr *attr, char *name,
struct list_head *config_terms)
{
return __add_event(list, idx, attr, name, NULL, config_terms) ? 0 : -ENOMEM;
return __add_event(list, idx, attr, name, NULL, config_terms, false) ? 0 : -ENOMEM;
}
static int parse_aliases(char *str, const char *names[][PERF_EVSEL__MAX_ALIASES], int size)
@ -1209,9 +1210,9 @@ int parse_events_add_numeric(struct parse_events_state *parse_state,
get_config_name(head_config), &config_terms);
}
int parse_events_add_pmu(struct parse_events_state *parse_state,
static int __parse_events_add_pmu(struct parse_events_state *parse_state,
struct list_head *list, char *name,
struct list_head *head_config)
struct list_head *head_config, bool auto_merge_stats)
{
struct perf_event_attr attr;
struct perf_pmu_info info;
@ -1232,7 +1233,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
if (!head_config) {
attr.type = pmu->type;
evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu->cpus, NULL);
evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu->cpus, NULL, auto_merge_stats);
return evsel ? 0 : -ENOMEM;
}
@ -1254,7 +1255,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
evsel = __add_event(list, &parse_state->idx, &attr,
get_config_name(head_config), pmu->cpus,
&config_terms);
&config_terms, auto_merge_stats);
if (evsel) {
evsel->unit = info.unit;
evsel->scale = info.scale;
@ -1267,6 +1268,13 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
return evsel ? 0 : -ENOMEM;
}
int parse_events_add_pmu(struct parse_events_state *parse_state,
struct list_head *list, char *name,
struct list_head *head_config)
{
return __parse_events_add_pmu(parse_state, list, name, head_config, false);
}
int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
char *str, struct list_head **listp)
{
@ -1296,8 +1304,8 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
return -1;
list_add_tail(&term->list, head);
if (!parse_events_add_pmu(parse_state, list,
pmu->name, head)) {
if (!__parse_events_add_pmu(parse_state, list,
pmu->name, head, true)) {
pr_debug("%s -> %s/%s/\n", str,
pmu->name, alias->str);
ok++;