linux-kernel - [RFC PATCH 21/22] perf bpf: probe at kprobe points.

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Date:	Thu, 30 Apr 2015 10:52:44 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<ast@...mgrid.com>, <davem@...emloft.net>, <acme@...nel.org>,
	<mingo@...hat.com>, <a.p.zijlstra@...llo.nl>,
	<masami.hiramatsu.pt@...achi.com>, <jolsa@...nel.org>
CC:	<lizefan@...nel.org>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>, <hekuang@...wei.com>
Subject: [RFC PATCH 21/22] perf bpf: probe at kprobe points.

---
 tools/perf/util/bpf-loader.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 208f5e8..186a3d0 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -952,8 +952,26 @@ out:
 	return -1;
 }
 
+static int bpf_probe(void)
+{
+	int err = add_perf_probe_events(params.event_array,
+					params.nr_events,
+					MAX_PROBES, 0);
+	/* add_perf_probe_events return negative when fail */
+	if (err < 0)
+		pr_err("bpf probe: failed to probe events\n");
+
+	return err < 0 ? err : 0;
+}
+
 int bpf__run(void)
 {
+	int err;
+
+	pr_debug("bpf: probing\n");
+	if ((err = bpf_probe()))
+		return err;
+
 	pr_info("BPF is running. Use Ctrl-c to stop.\n");
 	while(1)
 		sleep(1);
-- 
1.8.3.4

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