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perf header: Display message if BPF/BTF info is empty

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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@google.com>
Link: https://lore.kernel.org/r/20250617223356.2752099-4-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers 2025-06-06 23:12:37 -07:00 committed by Namhyung Kim
parent 57cbd56e2e
commit 4d2eefd7fb
1 changed files with 6 additions and 0 deletions
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6
tools/perf/util/header.c
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@ -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;