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Commit bd45d34d authored by Joel Fernandes's avatar Joel Fernandes Committed by Steven Rostedt (VMware)
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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: default avatarMichael Sartain <mikesart@gmail.com>
Signed-off-by: default avatarJoel Fernandes <joelaf@google.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent eaf260ac

kernel/trace/trace.c

+5 −1
Original line number Diff line number Diff line
@@ -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;