tracing: Treat recording tgid for idle task as a success

Currently we stop recording tgid for non-idle tasks when switching from/to idle
task since we treat that as a record failure. Fix that by treat recording of
tgid for idle task as a success.

Link: http://lkml.kernel.org/r/20170706230023.17942-2-joelaf@google.com
Cc: kernel-team@android.com
Cc: Ingo Molnar <mingo@redhat.com>
Reported-by: Michael Sartain <mikesart@gmail.com>
Signed-off-by: Joel Fernandes <joelaf@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6722d86f2af51dbcb42e28510a2ab4e10dbb1c2d..aee11e3a394f305d8829a4f0326d0d9999d8a74f 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2006,7 +2006,11 @@ int trace_find_tgid(int pid)
 
 static int trace_save_tgid(struct task_struct *tsk)
 {
-       if (unlikely(!tgid_map || !tsk->pid || tsk->pid > PID_MAX_DEFAULT))
+       /* treat recording of idle task as a success */
+       if (!tsk->pid)
+               return 1;
+
+       if (unlikely(!tgid_map || tsk->pid > PID_MAX_DEFAULT))
                return 0;
 
        tgid_map[tsk->pid] = tsk->tgid;