perf session: Warn about errors when processing pipe events too

Just like we do at __perf_session__process_events

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/session.c

@@ -838,6 +838,35 @@ static struct thread *perf_session__register_idle_thread(struct perf_session *se
 	return thread;
 }
 
+static void perf_session__warn_about_errors(const struct perf_session *session,
+					    const struct perf_event_ops *ops)
+{
+	if (ops->lost == event__process_lost &&
+	    session->hists.stats.total_lost != 0) {
+		ui__warning("Processed %Lu events and LOST %Lu!\n\n"
+			    "Check IO/CPU overload!\n\n",
+			    session->hists.stats.total_period,
+			    session->hists.stats.total_lost);
+	}
+
+	if (session->hists.stats.nr_unknown_events != 0) {
+		ui__warning("Found %u unknown events!\n\n"
+			    "Is this an older tool processing a perf.data "
+			    "file generated by a more recent tool?\n\n"
+			    "If that is not the case, consider "
+			    "reporting to linux-kernel@vger.kernel.org.\n\n",
+			    session->hists.stats.nr_unknown_events);
+	}
+
+ 	if (session->hists.stats.nr_invalid_chains != 0) {
+ 		ui__warning("Found invalid callchains!\n\n"
+ 			    "%u out of %u events were discarded for this reason.\n\n"
+ 			    "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
+ 			    session->hists.stats.nr_invalid_chains,
+ 			    session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
+ 	}
+}
+
 #define session_done()	(*(volatile int *)(&session_done))
 volatile int session_done;
 
@@ -911,6 +940,7 @@ more:
 done:
 	err = 0;
 out_err:
+	perf_session__warn_about_errors(self, ops);
 	perf_session_free_sample_buffers(self);
 	return err;
 }
@@ -1023,32 +1053,7 @@ more:
 	flush_sample_queue(session, ops);
 out_err:
 	ui_progress__delete(progress);
-
-	if (ops->lost == event__process_lost &&
-	    session->hists.stats.total_lost != 0) {
-		ui__warning("Processed %Lu events and LOST %Lu!\n\n"
-			    "Check IO/CPU overload!\n\n",
-			    session->hists.stats.total_period,
-			    session->hists.stats.total_lost);
-	}
-
-	if (session->hists.stats.nr_unknown_events != 0) {
-		ui__warning("Found %u unknown events!\n\n"
-			    "Is this an older tool processing a perf.data "
-			    "file generated by a more recent tool?\n\n"
-			    "If that is not the case, consider "
-			    "reporting to linux-kernel@vger.kernel.org.\n\n",
-			    session->hists.stats.nr_unknown_events);
-	}
-
- 	if (session->hists.stats.nr_invalid_chains != 0) {
- 		ui__warning("Found invalid callchains!\n\n"
- 			    "%u out of %u events were discarded for this reason.\n\n"
- 			    "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
- 			    session->hists.stats.nr_invalid_chains,
- 			    session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
- 	}
-
+	perf_session__warn_about_errors(session, ops);
 	perf_session_free_sample_buffers(session);
 	return err;
 }