[tip:perf/core] perf top: Synthesize BPF events for pre-existing loaded BPF programs

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  a40b95bcd30cf77c6c7a00f879dfecbded47b3bd
Gitweb:     https://git.kernel.org/tip/a40b95bcd30cf77c6c7a00f879dfecbded47b3bd
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 17 Jan 2019 08:15:20 -0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 21 Jan 2019 17:38:56 -0300

perf top: Synthesize BPF events for pre-existing loaded BPF programs

So that we can resolve symbols and map names.

Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: kernel-team@xxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20190117161521.1341602-9-songliubraving@xxxxxx
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-top.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index f64e312db787..5a486d4de56e 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -22,6 +22,7 @@
 #include "perf.h"
 
 #include "util/annotate.h"
+#include "util/bpf-event.h"
 #include "util/config.h"
 #include "util/color.h"
 #include "util/drv_configs.h"
@@ -1215,6 +1216,12 @@ static int __cmd_top(struct perf_top *top)
 
 	init_process_thread(top);
 
+	ret = perf_event__synthesize_bpf_events(&top->tool, perf_event__process,
+						&top->session->machines.host,
+						&top->record_opts);
+	if (ret < 0)
+		pr_warning("Couldn't synthesize bpf events.\n");
+
 	machine__synthesize_threads(&top->session->machines.host, &opts->target,
 				    top->evlist->threads, false,
 				    top->nr_threads_synthesize);