linux-kernel - [PATCH v3 3/3] perf pmus: Don't print duplicate PMU suffix in list by default

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Date:   Mon, 14 Aug 2023 09:37:57 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.g.garry@...cle.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/3] perf pmus: Don't print duplicate PMU suffix in list by default

Duplicate PMUs are no longer printed by default but the suffix of the
first is printed. When duplicate PMUs are being skipped avoid printing
the suffix.

Before:
```
$ perf list
...
  uncore_imc_free_running_0/data_read/               [Kernel PMU event]
  uncore_imc_free_running_0/data_total/              [Kernel PMU event]
  uncore_imc_free_running_0/data_write/              [Kernel PMU event]
```

After:
```
$ perf list
...
  uncore_imc_free_running/data_read/                 [Kernel PMU event]
  uncore_imc_free_running/data_total/                [Kernel PMU event]
  uncore_imc_free_running/data_write/                [Kernel PMU event]
...
$ perf list -v
  uncore_imc_free_running_0/data_read/               [Kernel PMU event]
  uncore_imc_free_running_0/data_total/              [Kernel PMU event]
  uncore_imc_free_running_0/data_write/              [Kernel PMU event]
  uncore_imc_free_running_1/data_read/               [Kernel PMU event]
  uncore_imc_free_running_1/data_total/              [Kernel PMU event]
  uncore_imc_free_running_1/data_write/              [Kernel PMU event]
...
```

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/pmus.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 5073843aca19..b0ecb2e5bdcc 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -440,10 +440,13 @@ static int sub_non_neg(int a, int b)
 }
 
 static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,
-			  const struct perf_pmu_alias *alias)
+			  const struct perf_pmu_alias *alias, bool skip_duplicate_pmus)
 {
 	struct parse_events_term *term;
-	int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
+	int pmu_name_len = skip_duplicate_pmus
+		? pmu_name_len_no_suffix(pmu->name, /*num=*/NULL)
+		: (int)strlen(pmu->name);
+	int used = snprintf(buf, len, "%.*s/%s", pmu_name_len, pmu->name, alias->name);
 
 	list_for_each_entry(term, &alias->terms, list) {
 		if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
@@ -473,9 +476,10 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
 	int printed = 0;
 	int len, j;
 	struct sevent *aliases;
+	bool skip_duplicate_pmus = print_cb->skip_duplicate_pmus(print_state);
 	struct perf_pmu *(*scan_fn)(struct perf_pmu *);
 
-	if (print_cb->skip_duplicate_pmus(print_state))
+	if (skip_duplicate_pmus)
 		scan_fn = perf_pmus__scan_skip_duplicates;
 	else
 		scan_fn = perf_pmus__scan;
@@ -518,6 +522,7 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
 			*desc = NULL, *long_desc = NULL,
 			*encoding_desc = NULL, *topic = NULL,
 			*pmu_name = NULL;
+		int pmu_name_len;
 		bool deprecated = false;
 		size_t buf_used;
 
@@ -528,7 +533,8 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
 		if (!aliases[j].event) {
 			/* A selectable event. */
 			pmu_name = aliases[j].pmu->name;
-			buf_used = snprintf(buf, sizeof(buf), "%s//", pmu_name) + 1;
+			pmu_name_len = pmu_name_len_no_suffix(pmu_name, /*num=*/NULL);
+			buf_used = snprintf(buf, sizeof(buf), "%.*s//", pmu_name_len, pmu_name) + 1;
 			name = buf;
 		} else {
 			if (aliases[j].event->desc) {
@@ -536,7 +542,7 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
 				buf_used = 0;
 			} else {
 				name = format_alias(buf, sizeof(buf), aliases[j].pmu,
-						    aliases[j].event);
+						    aliases[j].event, skip_duplicate_pmus);
 				if (aliases[j].is_cpu) {
 					alias = name;
 					name = aliases[j].event->name;
@@ -554,8 +560,10 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
 			long_desc = aliases[j].event->long_desc;
 			topic = aliases[j].event->topic;
 			encoding_desc = buf + buf_used;
+			pmu_name_len = pmu_name_len_no_suffix(pmu_name, /*num=*/NULL);
 			buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
-					"%s/%s/", pmu_name, aliases[j].event->str) + 1;
+					"%.*s/%s/", pmu_name_len, pmu_name,
+					aliases[j].event->str) + 1;
 			deprecated = aliases[j].event->deprecated;
 		}
 		print_cb->print_event(print_state,
-- 
2.41.0.640.ga95def55d0-goog