linux-kernel - [PATCH v8 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing loaded BPF programs

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Message-ID: <20190115185349.1191609-9-songliubraving@fb.com>
Date:   Tue, 15 Jan 2019 10:53:48 -0800
From:   Song Liu <songliubraving@...com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Arnaldo Carvalho de Melo <acme@...hat.com>, <peterz@...radead.org>,
        <acme@...nel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
        <kernel-team@...com>, <dsahern@...il.com>,
        Song Liu <songliubraving@...com>
Subject: [PATCH v8 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing loaded BPF programs

From: Arnaldo Carvalho de Melo <acme@...hat.com>

So that we can resolve symbols and map names.

Cc: Song Liu <songliubraving@...com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: David Ahern <dsahern@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: kernel-team@...com
Cc: netdev@...r.kernel.org
Link: https://lkml.kernel.org/n/tip-h3loibff6htedj43q7uinon0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Song Liu <songliubraving@...com>
---
 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 fe3ecfb2e64b..62055e6a72ae 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"
@@ -1220,6 +1221,12 @@ 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);
-- 
2.17.1