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Subject[PATCH 02/13] perf, tools, stat: Collapse identically named events
Date
From: Andi Kleen <ak@linux.intel.com>

The uncore PMU has a lot of duplicated PMUs for different subsystems.
When expanding an uncore alias we usually end up with a large
number of identically named aliases, which makes perf stat
output difficult to read.

Automatically sum them up in perf stat, unless --no-merge is specified.

This can be default because only the uncores generally have duplicated
aliases. Other PMUs have unique names.

Before:

% perf stat --no-merge -a -e unc_c_llc_lookup.any sleep 1

Performance counter stats for 'system wide':

694,976 Bytes unc_c_llc_lookup.any
706,304 Bytes unc_c_llc_lookup.any
956,608 Bytes unc_c_llc_lookup.any
782,720 Bytes unc_c_llc_lookup.any
605,696 Bytes unc_c_llc_lookup.any
442,816 Bytes unc_c_llc_lookup.any
659,328 Bytes unc_c_llc_lookup.any
509,312 Bytes unc_c_llc_lookup.any
263,936 Bytes unc_c_llc_lookup.any
592,448 Bytes unc_c_llc_lookup.any
672,448 Bytes unc_c_llc_lookup.any
608,640 Bytes unc_c_llc_lookup.any
641,024 Bytes unc_c_llc_lookup.any
856,896 Bytes unc_c_llc_lookup.any
808,832 Bytes unc_c_llc_lookup.any
684,864 Bytes unc_c_llc_lookup.any
710,464 Bytes unc_c_llc_lookup.any
538,304 Bytes unc_c_llc_lookup.any

1.002577660 seconds time elapsed

After:

% perf stat -a -e unc_c_llc_lookup.any sleep 1

Performance counter stats for 'system wide':

2,685,120 Bytes unc_c_llc_lookup.any

1.002648032 seconds time elapsed

v2: Split collect_aliases. Rename alias flag.
v3: Make sure unsupported/not counted is always printed.
v4: Factor out callback change into separate patch.
v5: Move check for bad results here
Move merged check into collect_data
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/Documentation/perf-stat.txt | 3 +++
tools/perf/builtin-stat.c | 38 ++++++++++++++++++++++++++++++----
tools/perf/util/evsel.h | 1 +
3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index aecf2a87e7d6..400634943251 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -237,6 +237,9 @@ To interpret the results it is usually needed to know on which
CPUs the workload runs on. If needed the CPUs can be forced using
taskset.

+--no-merge::
+Do not merge results from same PMUs.
+
EXAMPLES
--------

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5c13a0f40adc..a4da10a506dd 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -140,6 +140,7 @@ static unsigned int unit_width = 4; /* strlen("unit") */
static bool forever = false;
static bool metric_only = false;
static bool force_metric_only = false;
+static bool no_merge = false;
static struct timespec ref_time;
static struct cpu_map *aggr_map;
static aggr_get_id_t aggr_get_id;
@@ -1182,12 +1183,37 @@ static void aggr_update_shadow(void)
}
}

-static void collect_data(struct perf_evsel *counter,
+static void collect_all_aliases(struct perf_evsel *counter,
void (*cb)(struct perf_evsel *counter, void *data,
bool first),
void *data)
{
+ struct perf_evsel *alias;
+
+ alias = list_prepare_entry(counter, &(evsel_list->entries), node);
+ list_for_each_entry_continue (alias, &evsel_list->entries, node) {
+ if (strcmp(perf_evsel__name(alias), perf_evsel__name(counter)) ||
+ alias->scale != counter->scale ||
+ alias->cgrp != counter->cgrp ||
+ strcmp(alias->unit, counter->unit) ||
+ nsec_counter(alias) != nsec_counter(counter))
+ break;
+ alias->merged_stat = true;
+ cb(alias, data, false);
+ }
+}
+
+static bool collect_data(struct perf_evsel *counter,
+ void (*cb)(struct perf_evsel *counter, void *data,
+ bool first),
+ void *data)
+{
+ if (counter->merged_stat)
+ return false;
cb(counter, data, true);
+ if (!no_merge)
+ collect_all_aliases(counter, cb, data);
+ return true;
}

struct aggr_data {
@@ -1245,7 +1271,8 @@ static void print_aggr(char *prefix)
evlist__for_each_entry(evsel_list, counter) {
ad.val = ad.ena = ad.run = 0;
ad.nr = 0;
- collect_data(counter, aggr_cb, &ad);
+ if (!collect_data(counter, aggr_cb, &ad))
+ continue;
nr = ad.nr;
ena = ad.ena;
run = ad.run;
@@ -1318,7 +1345,8 @@ static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
double uval;
struct caggr_data cd = { .avg = 0.0 };

- collect_data(counter, counter_aggr_cb, &cd);
+ if (!collect_data(counter, counter_aggr_cb, &cd))
+ return;

if (prefix && !metric_only)
fprintf(output, "%s", prefix);
@@ -1353,7 +1381,8 @@ static void print_counter(struct perf_evsel *counter, char *prefix)
for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
struct aggr_data ad = { .cpu = cpu };

- collect_data(counter, counter_cb, &ad);
+ if (!collect_data(counter, counter_cb, &ad))
+ return;
val = ad.val;
ena = ad.ena;
run = ad.run;
@@ -1701,6 +1730,7 @@ static const struct option stat_options[] = {
"list of cpus to monitor in system-wide"),
OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
"disable CPU count aggregation", AGGR_NONE),
+ OPT_BOOLEAN(0, "no-merge", &no_merge, "Do not merge identical named events"),
OPT_STRING('x', "field-separator", &csv_sep, "separator",
"print counts with custom separator"),
OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 06ef6f29efa1..bd2e9b112d49 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -131,6 +131,7 @@ struct perf_evsel {
bool cmdline_group_boundary;
struct list_head config_terms;
int bpf_fd;
+ bool merged_stat;
};

union u64_swap {
--
2.9.3
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