From: Joel Fernandes <[email protected]> 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/[email protected] Cc: [email protected] Cc: Ingo Molnar <[email protected]> Reported-by: Michael Sartain <[email protected]> Signed-off-by: Joel Fernandes <[email protected]> Signed-off-by: Steven Rostedt (VMware) <[email protected]> --- kernel/trace/trace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 6722d86f2af5..aee11e3a394f 100644 --- 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; -- 2.10.2
