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

[Markus Metzger]

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@xxxxxxxxx>
---

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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