Re: [PATCH v5 perf, bpf-next 3/7] perf, bpf: introduce PERF_RECORD_BPF_EVENT

On Thu, Dec 20, 2018 at 10:29:00AM -0800, Song Liu wrote:

+static void perf_event_bpf_emit_ksymbols(struct bpf_prog *prog,
+					 enum perf_bpf_event_type type)
+{
+	bool unregister = type == PERF_BPF_EVENT_PROG_UNLOAD;
+	int i;
+
+	if (prog->aux->func_cnt == 0) {
+		perf_event_ksymbol(PERF_RECORD_MISC_KSYMBOL_TYPE_BPF,
+				   (u64)(unsigned long)prog->bpf_func,
+				   prog->jited_len, unregister,
+				   perf_event_bpf_get_name, prog);
+	} else {
+		for (i = 0; i < prog->aux->func_cnt; i++) {
+			struct bpf_prog *subprog = prog->aux->func[i];
+
+			perf_event_ksymbol(
+				PERF_RECORD_MISC_KSYMBOL_TYPE_BPF,
+				(u64)(unsigned long)subprog->bpf_func,
+				subprog->jited_len, unregister,
+				perf_event_bpf_get_name, subprog);
+		}
+	}
+}

That's a bit unexpected, but yes sure, that works for now.

I was expecting it to be hooked up in your kallsym rbtree thing, but
whatever, we can fix that when needed.