perf record: Don't exit in live mode when no tracepoints are enabled

With this I was able to actually test Tom Zanussi's two previous patches
in my usual perf testing ways, i.e. without any tracepoints activated.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e382d93d369..ac989e9ba8f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -666,12 +666,15 @@ static int __cmd_record(int argc, const char **argv)
                                                      nr_counters,
                                                      process_synthesized_event,
                                                      session);
-                if (err <= 0) {
-                        pr_err("Couldn't record tracing data.\n");
-                        return err;
-                }
-
-                advance_output(err);
+                /*
+                 * FIXME err <= 0 here actually means that there were no tracepoints
+                 * so its not really an error, just that we don't need to synthesize
+                 * anything.
+                 * We really have to return this more properly and also propagate
+                 * errors that now are calling die()
+                 */
+                if (err > 0)
+                        advance_output(err);
         }
 
         machine = perf_session__find_host_machine(session);