linux-kernel - [PATCH v3 3/5] perf auxtrace: Refactor evlist__enable_event

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Message-Id: <20240806204813.722372-4-leo.yan@arm.com>
Date: Tue,  6 Aug 2024 21:48:11 +0100
From: Leo Yan <leo.yan@....com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v3 3/5] perf auxtrace: Refactor evlist__enable_event_idx()

This commit splits the evlist__enable_event_idx() function into two
steps. The first step uses a new function evlist__find_cpu_map_idx() to
find the CPU map index, based on the found CPU map index or a thread map
index, it continues to call evlist__enable_event_idx() for enabling the
corresponding event.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/util/auxtrace.c | 42 +++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index d5015d27b6dd..174d486056e0 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -651,20 +651,30 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
 	return -EINVAL;
 }
 
-static int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel, int idx)
+static int evlist__find_cpu_map_idx(struct evlist *evlist, struct evsel *evsel,
+				    int idx)
 {
 	bool per_cpu_mmaps = !perf_cpu_map__has_any_cpu(evlist->core.user_requested_cpus);
+	struct perf_cpu evlist_cpu;
+	int cpu_map_idx;
 
-	if (per_cpu_mmaps) {
-		struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
-		int cpu_map_idx = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
+	if (!per_cpu_mmaps)
+		return -EINVAL;
 
-		if (cpu_map_idx == -1)
-			return -EINVAL;
-		return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
-	}
+	evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
+	cpu_map_idx = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
+	if (cpu_map_idx == -1)
+		return -ENOENT;
+
+	return cpu_map_idx;
+}
 
-	return perf_evsel__enable_thread(&evsel->core, idx);
+static int evlist__enable_event_idx(struct evsel *evsel, int cpu_mode, int idx)
+{
+	if (cpu_mode)
+		return perf_evsel__enable_cpu(&evsel->core, idx);
+	else
+		return perf_evsel__enable_thread(&evsel->core, idx);
 }
 
 int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
@@ -675,10 +685,22 @@ int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
 		return -EINVAL;
 
 	evlist__for_each_entry(itr->evlist, evsel) {
+		int cpu_map_idx;
+
 		if (evsel__is_aux_event(evsel)) {
 			if (evsel->disabled)
 				return 0;
-			return evlist__enable_event_idx(itr->evlist, evsel, idx);
+
+			cpu_map_idx = evlist__find_cpu_map_idx(itr->evlist,
+							       evsel, idx);
+			/* No map is found in per CPU mmap */
+			if (cpu_map_idx == -ENOENT)
+				return cpu_map_idx;
+
+			if (cpu_map_idx >= 0)
+				return evlist__enable_event_idx(evsel, 1, cpu_map_idx);
+			else
+				return evlist__enable_event_idx(evsel, 0, idx);
 		}
 	}
 	return -EINVAL;
-- 
2.34.1