linux-kernel - [patch 4/6] x86, ftrace, hw-branch-tracer: reset trace buffer on close

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Message-ID: <20090119103331.A18837@sedona.ch.intel.com>
Date:	Mon, 19 Jan 2009 10:33:31 +0100
From:	Markus Metzger <markus.t.metzger@...el.com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com
Cc:	markus.t.metzger@...el.com, markus.t.metzger@...il.com,
	srostedt@...hat.com
Subject: [patch 4/6] x86, ftrace, hw-branch-tracer: reset trace buffer on close

Reset the ftrace buffer on close. Since we use cyclic buffers, the
trace is not contiguous, anyway.

Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
---

Index: ftrace/kernel/trace/trace_hw_branches.c
===================================================================
--- ftrace.orig/kernel/trace/trace_hw_branches.c	2009-01-16 16:20:04.000000000 +0100
+++ ftrace/kernel/trace/trace_hw_branches.c	2009-01-19 09:18:54.000000000 +0100
@@ -270,6 +270,11 @@ static void trace_bts_prepare(struct tra
 	mutex_unlock(&bts_tracer_mutex);
 }
 
+static void trace_bts_close(struct trace_iterator *iter)
+{
+	tracing_reset_online_cpus(iter->tr);
+}
+
 void trace_hw_branch_oops(void)
 {
 	mutex_lock(&bts_tracer_mutex);
@@ -288,7 +293,8 @@ struct tracer bts_tracer __read_mostly =
 	.print_line	= bts_trace_print_line,
 	.start		= bts_trace_start,
 	.stop		= bts_trace_stop,
-	.open		= trace_bts_prepare
+	.open		= trace_bts_prepare,
+	.close		= trace_bts_close
 };
 
 __init static int init_bts_trace(void)
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