[PATCH 30/31] perf record: Apply config to BPF objects before recording

From: Wang Nan
Date: Wed Oct 14 2015 - 08:44:43 EST


From: He Kuang <hekuang@xxxxxxxxxx>

In perf record, before start recording, call bpf__apply_config() to
turn on all BPF config options.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxxxx>
Cc: Brendan Gregg <brendan.d.gregg@xxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kaixu Xia <xiakaixu@xxxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
Link: http://lkml.kernel.org/n/ebpf-ziazd5s4t9j96d01t5bdbtat@xxxxxxxxxxxxxx
---
tools/perf/builtin-record.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 200f221..a47ce9e 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -32,6 +32,7 @@
#include "util/parse-branch-options.h"
#include "util/parse-regs-options.h"
#include "util/llvm-utils.h"
+#include "util/bpf-loader.h"

#include <unistd.h>
#include <sched.h>
@@ -524,6 +525,15 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
goto out_child;
}

+ err = bpf__apply_config();
+ if (err) {
+ char errbuf[BUFSIZ];
+
+ bpf__strerror_apply_config(err, errbuf, sizeof(errbuf));
+ pr_warning("WARNING: Apply config to BPF failed: %s\n",
+ errbuf);
+ }
+
/*
* Normally perf_session__new would do this, but it doesn't have the
* evlist.
--
1.8.3.4

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