linux-kernel - [PATCH 2/3] tracing: Treat recording tgid for idle task as a success

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Message-Id: <20170706230023.17942-2-joelaf@google.com>
Date:   Thu,  6 Jul 2017 16:00:22 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     mikesart@...il.com, Joel Fernandes <joelaf@...gle.com>,
        kernel-team@...roid.com, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 2/3] 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.

Cc: kernel-team@...roid.com
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Reported-by: Michael Sartain <mikesart@...il.com>
Signed-off-by: Joel Fernandes <joelaf@...gle.com>
---
 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 7a0c493723a9..363924f90e2f 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;
-- 
2.13.2.725.g09c95d1e9-goog