linux-kernel - [patch 4/5] x86, ftrace, hw-branch-tracer: reset trace on close

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Date:	Fri, 16 Jan 2009 12:01:53 +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 4/5] x86, ftrace, hw-branch-tracer: reset trace on close

Reset the ftrace buffer on close. Since we use cyclic buffers to store
the trace, the trace is not contiguous, anyway. This behaviour should
be more natural.

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	2009-01-14 15:26:11.000000000 +0100
+++ ftrace/kernel/trace/trace_hw_branches.c	2009-01-14 15:26:16.000000000 +0100
@@ -272,6 +272,11 @@
 	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);
@@ -290,7 +295,8 @@
 	.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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