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From: Frederic Weisbecker <>
To: Ingo Molnar <>
Cc: Linux Kernel <>
Subject: [PATCH][RESEND] tracing/ftrace: Remove unused code in sched_switch tracer
Date: Fri, 31 Oct 2008 13:14:28 +0100	[thread overview]
Message-ID: <> (raw)

When init_sched_switch_trace() is called, it has no reason to start
the sched tracer if the sched_ref is not zero.

_ If this is non-zero, the tracer is already used, but we can register it
to the tracing engine. There is already a security which avoid the tracer
probes not to be resgistered twice. 

_ If this is zero, this block will not be used.

Signed-off-by: Frederic Weisbecker <>
CC: Steven Rostedt <>
 kernel/trace/trace_sched_switch.c |    8 --------
 1 files changed, 0 insertions(+), 8 deletions(-)
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 59de514..96620c7 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -203,14 +203,6 @@ static struct tracer sched_switch_trace __read_mostly =
 __init static int init_sched_switch_trace(void)
-	int ret = 0;
-	if (atomic_read(&sched_ref))
-		ret = tracing_sched_register();
-	if (ret) {
-		pr_info("error registering scheduler trace\n");
-		return ret;
-	}
 	return register_tracer(&sched_switch_trace);

             reply	other threads:[~2008-10-31 12:14 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-31 12:14 Frederic Weisbecker [this message]
2008-10-31 12:15 ` Frédéric Weisbecker

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