perf tools: Librarize idle thread registration

Librarize register_idle_thread() used by annotate and report.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1251693921-6579-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 15 insertions, 0 deletions

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index f98032c135c6..3acd37f54888 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -80,6 +80,19 @@ threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match)
         return th;
 }
 
+struct thread *
+register_idle_thread(struct rb_root *threads, struct thread **last_match)
+{
+        struct thread *thread = threads__findnew(0, threads, last_match);
+
+        if (!thread || thread__set_comm(thread, "[idle]")) {
+                fprintf(stderr, "problem inserting idle task.\n");
+                exit(-1);
+        }
+
+        return thread;
+}
+
 void thread__insert_map(struct thread *self, struct map *map)
 {
         struct map *pos, *tmp;
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index b1c66719379b..634f2809a342 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -13,6 +13,8 @@ struct thread {
 int thread__set_comm(struct thread *self, const char *comm);
 struct thread *
 threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match);
+struct thread *
+register_idle_thread(struct rb_root *threads, struct thread **last_match);
 void thread__insert_map(struct thread *self, struct map *map);
 int thread__fork(struct thread *self, struct thread *parent);
 struct map *thread__find_map(struct thread *self, u64 ip);