[PATCH perf,bpf 2/2] perf, bpf: show BPF program name in print_bpf_prog_info()

From: Song Liu
Date: Thu Mar 14 2019 - 14:25:56 EST


This patch enables showing bpf program name in the header.

Before the patch:

perf report --header-only
...
# bpf_prog_info of id 9
# bpf_prog_info of id 10
# bpf_prog_info of id 13

After the patch:

# bpf_prog_info 9: bpf_prog_7be49e3934a125ba
# bpf_prog_info 10: bpf_prog_2a142ef67aaad174
# bpf_prog_info 13: bpf_prog_47368425825d7384_task__task_newt

Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
tools/perf/util/bpf-event.c | 36 ++++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-event.h | 10 +++++++++-
tools/perf/util/header.c | 5 +++--
3 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 6e035e08aa2d..dde35a36e2de 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -433,3 +433,39 @@ int bpf_event__add_sb_event(struct perf_evlist **evlist,

return perf_evlist__add_sb_event(evlist, &attr, bpf_event__sb_cb, env);
}
+
+void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
+ struct perf_env *env,
+ FILE *fp)
+{
+ char name[KSYM_NAME_LEN];
+ struct btf *btf = NULL;
+ u32 sub_prog_cnt, i;
+
+ sub_prog_cnt = info->nr_jited_ksyms;
+ if (sub_prog_cnt != info->nr_prog_tags ||
+ sub_prog_cnt != info->nr_jited_func_lens)
+ return;
+
+ if (info->btf_id) {
+ struct btf_node *node;
+
+ node = perf_env__find_btf(env, info->btf_id);
+ if (node)
+ btf = btf__new((__u8 *)(node->data),
+ node->data_size);
+ }
+
+ if (sub_prog_cnt == 1) {
+ synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, 0);
+ fprintf(fp, "# bpf_prog_info %u: %s\n", info->id, name);
+ return;
+ }
+
+ fprintf(fp, "# bpf_prog_info %u:\n", info->id);
+ for (i = 0; i < sub_prog_cnt; i++) {
+ synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, i);
+
+ fprintf(fp, "# \tsub_prog %u: %s\n", i, name);
+ }
+}
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
index 249909c826e7..4270dfd9cde9 100644
--- a/tools/perf/util/bpf-event.h
+++ b/tools/perf/util/bpf-event.h
@@ -38,7 +38,9 @@ int perf_event__synthesize_bpf_events(struct perf_session *session,
struct record_opts *opts);
int bpf_event__add_sb_event(struct perf_evlist **evlist,
struct perf_env *env);
-
+void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
+ struct perf_env *env,
+ FILE *fp);
#else
static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
union perf_event *event __maybe_unused,
@@ -61,5 +63,11 @@ static int bpf_event__add_sb_event(struct perf_evlist **evlist __maybe_unused,
return 0;
}

+void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
+ struct perf_env *env,
+ FILE *fp)
+{
+
+}
#endif // HAVE_LIBBPF_SUPPORT
#endif
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7decd2d1dbda..588a80bdd500 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1434,8 +1434,9 @@ static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)

node = rb_entry(next, struct bpf_prog_info_node, rb_node);
next = rb_next(&node->rb_node);
- fprintf(fp, "# bpf_prog_info of id %u\n",
- node->info_linear->info.id);
+
+ bpf_event__print_bpf_prog_info(&node->info_linear->info,
+ env, fp);
}

up_read(&env->bpf_progs.lock);
--
2.17.1