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>

8 files changed, 16 insertions, 24 deletions

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 43e3bb354442..93d765a746f2 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -464,14 +464,11 @@ static int __cmd_annotate(void)
 {
         struct perf_session *session = perf_session__new(input_name, O_RDONLY,
                                                          force);
-        struct thread *idle;
         int ret;
 
         if (session == NULL)
                 return -ENOMEM;
 
-        idle = register_idle_thread();
-
         ret = perf_session__process_events(session, &event_ops, 0,
                                            &event__cwdlen, &event__cwd);
         if (ret)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 6f74bd8d20e6..37a849906afe 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -372,7 +372,6 @@ static int read_events(void)
         if (session == NULL)
                 return -ENOMEM;
 
-        register_idle_thread();
         err = perf_session__process_events(session, &event_ops, 0,
                                            &event__cwdlen, &event__cwd);
         perf_session__delete(session);
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index c203eaf73a2f..4b37ac4f128b 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -761,7 +761,6 @@ static struct perf_event_ops event_ops = {
 
 static int __cmd_report(void)
 {
-        struct thread *idle;
         int ret;
         struct perf_session *session;
 
@@ -769,9 +768,6 @@ static int __cmd_report(void)
         if (session == NULL)
                 return -ENOMEM;
 
-        idle = register_idle_thread();
-        thread__comm_adjust(idle);
-
         if (show_threads)
                 perf_read_values_init(&show_threads_values);
 
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index b5b447236261..847ed51248b1 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1670,8 +1670,6 @@ static int read_events(void)
         if (session == NULL)
                 return -ENOMEM;
 
-        register_idle_thread();
-
         err = perf_session__process_events(session, &event_ops, 0,
                                            &event__cwdlen, &event__cwd);
         perf_session__delete(session);
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c404dece950d..40cb896581dd 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -125,7 +125,6 @@ static struct perf_event_ops event_ops = {
 
 static int __cmd_trace(struct perf_session *session)
 {
-        register_idle_thread();
         return perf_session__process_events(session, &event_ops, 0,
                                             &event__cwdlen, &event__cwd);
 }
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);