linux-kernel - [PATCH v1 3/4] perf header: Display message if BPF/BTF info is empty

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Message-ID: <20250607061238.161756-4-irogers@google.com>
Date: Fri,  6 Jun 2025 23:12:37 -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>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Zhongqiu Han <quic_zhonhan@...cinc.com>, Yicong Yang <yangyicong@...ilicon.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org
Subject: [PATCH v1 3/4] perf header: Display message if BPF/BTF info is empty

The perf.data file may contain a bpf_prog_info or bpf_btf feature. If
the contents of these are empty then nothing is displayed. Rather than
display nothing and not account for the file space, display an empty
message.

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

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7798435ab5d3..69e4f6aae293 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1814,6 +1814,9 @@ static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)
 	root = &env->bpf_progs.infos;
 	next = rb_first(root);
 
+	if (!next)
+		printf("# bpf_prog_info empty\n");
+
 	while (next) {
 		struct bpf_prog_info_node *node;
 
@@ -1838,6 +1841,9 @@ static void print_bpf_btf(struct feat_fd *ff, FILE *fp)
 	root = &env->bpf_progs.btfs;
 	next = rb_first(root);
 
+	if (!next)
+		printf("# btf info empty\n");
+
 	while (next) {
 		struct btf_node *node;
 
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog