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Subject[PATCH] tracing: Make power trace display correct header
Before patch:
# tracer: power
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
[ 676.875865889] CSTATE: Going to C1 on cpu 0 for 0.005911463
[ 676.882938805] CSTATE: Going to C1 on cpu 0 for 0.104796532
...

After patch:
# tracer: power
#
# TIMESTAMP STATE EVENT
# | | |
[ 676.875865889] CSTATE: Going to C1 on cpu 0 for 0.005911463
[ 676.882938805] CSTATE: Going to C1 on cpu 0 for 0.104796532
...

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
---
kernel/trace/trace_power.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 810a5b7..a74acdf 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -190,6 +190,12 @@ static enum print_line_t power_print_line(struct trace_iterator *iter)
return TRACE_TYPE_UNHANDLED;
}

+static void power_print_header(struct seq_file *s)
+{
+ seq_printf(s, "# TIMESTAMP STATE EVENT\n");
+ seq_printf(s, "# | | |\n");
+}
+
static struct tracer power_tracer __read_mostly =
{
.name = "power",
@@ -198,6 +204,7 @@ static struct tracer power_tracer __read_mostly =
.stop = stop_power_trace,
.reset = power_trace_reset,
.print_line = power_print_line,
+ .print_header = power_print_header,
};

static int init_power_trace(void)
--
1.5.5.3



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