perf session: Register the idle thread in perf_session__process_events

No need for all tools to register it and then immediately call
perf_session__process_events.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260741029-4430-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 16 insertions, 13 deletions

diff --git a/tools/perf/util/data_map.c b/tools/perf/util/data_map.c
index ba5bcfa1f908..36e3bfe73196 100644
--- a/tools/perf/util/data_map.c
+++ b/tools/perf/util/data_map.c
@@ -1,6 +1,7 @@
 #include "symbol.h"
 #include "util.h"
 #include "debug.h"
+#include "thread.h"
 #include "session.h"
 
 static unsigned long	mmap_window = 32;
@@ -127,6 +128,18 @@ out:
 	return err;
 }
 
+static struct thread *perf_session__register_idle_thread(struct perf_session *self __used)
+{
+	struct thread *thread = threads__findnew(0);
+
+	if (!thread || thread__set_comm(thread, "swapper")) {
+		pr_err("problem inserting idle task.\n");
+		thread = NULL;
+	}
+
+	return thread;
+}
+
 int perf_session__process_events(struct perf_session *self,
 				 struct perf_event_ops *ops,
 				 int full_paths, int *cwdlen, char **cwd)
@@ -140,6 +153,9 @@ int perf_session__process_events(struct perf_session *self,
 	uint32_t size;
 	char *buf;
 
+	if (perf_session__register_idle_thread(self) == NULL)
+		return -ENOMEM;
+
 	perf_event_ops__fill_defaults(ops);
 
 	page_size = getpagesize();
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index b68a00ea4121..5c0ab14f3dba 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -161,18 +161,6 @@ struct thread *threads__findnew(pid_t pid)
 	return th;
 }
 
-struct thread *register_idle_thread(void)
-{
-	struct thread *thread = threads__findnew(0);
-
-	if (!thread || thread__set_comm(thread, "swapper")) {
-		fprintf(stderr, "problem inserting idle task.\n");
-		exit(-1);
-	}
-
-	return thread;
-}
-
 static void map_groups__remove_overlappings(struct map_groups *self,
 					    struct map *map)
 {
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 1751802a09ba..2e35e1f6bb43 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -24,7 +24,6 @@ void map_groups__init(struct map_groups *self);
 int thread__set_comm(struct thread *self, const char *comm);
 int thread__comm_len(struct thread *self);
 struct thread *threads__findnew(pid_t pid);
-struct thread *register_idle_thread(void);
 void thread__insert_map(struct thread *self, struct map *map);
 int thread__fork(struct thread *self, struct thread *parent);
 size_t map_groups__fprintf_maps(struct map_groups *self, FILE *fp);