[tip:tracing/urgent] tracing: Fix branch trace header

[tip-bot for Zhaolei]

Commit-ID:  fbe5e34d34152775434c6efde4dadb17a19e121a
Gitweb:     http://git.kernel.org/tip/fbe5e34d34152775434c6efde4dadb17a19e121a
Author:     Zhaolei <zhaolei@xxxxxxxxxxxxxx>
AuthorDate: Mon, 13 Apr 2009 16:02:34 +0800
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 13 Apr 2009 23:42:42 +0200

tracing: Fix branch trace header

Before patch:

  # tracer: branch
  #
  #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
  #              | |       |          |         |
             <...>-2981  [000] 24008.872738: [  ok  ] trace_irq_handler_exit:irq_event_types.h:41
             <...>-2981  [000] 24008.872742: [  ok  ] note_interrupt:spurious.c:229
  ...

After patch:

  # tracer: branch
  #
  #           TASK-PID    CPU#    TIMESTAMP  CORRECT  FUNC:FILE:LINE
  #              | |       |          |         |       |
             <...>-2985  [000] 26329.142970: [  ok  ] slab_free:slub.c:1776
             <...>-2985  [000] 26329.142972: [  ok  ] trace_kmem_cache_free:kmem_event_types.h:191
  ...

Signed-off-by: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
LKML-Reference: <49E2F19A.3040006@xxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 kernel/trace/trace_branch.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index ad8c22e..8333715 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -155,6 +155,13 @@ static enum print_line_t trace_branch_print(struct trace_iterator *iter,
 	return TRACE_TYPE_HANDLED;
 }
 
+static void branch_print_header(struct seq_file *s)
+{
+	seq_puts(s, "#           TASK-PID    CPU#    TIMESTAMP  CORRECT"
+		"  FUNC:FILE:LINE\n");
+	seq_puts(s, "#              | |       |          |         |   "
+		"    |\n");
+}
 
 static struct trace_event trace_branch_event = {
 	.type		= TRACE_BRANCH,
@@ -169,6 +176,7 @@ static struct tracer branch_trace __read_mostly =
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest	= trace_selftest_startup_branch,
 #endif /* CONFIG_FTRACE_SELFTEST */
+	.print_header	= branch_print_header,
 };
 
 __init static int init_branch_tracer(void)
--
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