perf trace: Call bpf__apply_obj_config in 'perf trace'

Without this patch BPF map configuration is not applied.

Command like this:
 # ./perf trace --ev bpf-output/no-inherit,name=evt/ \
                --ev ./test_bpf_trace.c/map:channel.event=evt/ \
                usleep 100000

Load BPF files without error, but since map:channel.event=evt is not
applied, bpf-output event not work.

This patch allows 'perf trace' load and run BPF scripts.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456479154-136027-7-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 20916dd..254149c 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -33,6 +33,7 @@
 #include "util/stat.h"
 #include "trace-event.h"
 #include "util/parse-events.h"
+#include "util/bpf-loader.h"
 
 #include <libaudit.h>
 #include <stdlib.h>
@@ -2586,6 +2587,16 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
        if (err < 0)
                goto out_error_open;
 
+       err = bpf__apply_obj_config();
+       if (err) {
+               char errbuf[BUFSIZ];
+
+               bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
+               pr_err("ERROR: Apply config to BPF failed: %s\n",
+                        errbuf);
+               goto out_error_open;
+       }
+
        /*
         * Better not use !target__has_task() here because we need to cover the
         * case where no threads were specified in the command line, but a