tracing: Fix power tracer 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
...
v2: Use seq_puts instead of seq_printf
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <49E2E889.5000903@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index bae791e..1184397 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -186,6 +186,12 @@
return TRACE_TYPE_UNHANDLED;
}
+static void power_print_header(struct seq_file *s)
+{
+ seq_puts(s, "# TIMESTAMP STATE EVENT\n");
+ seq_puts(s, "# | | |\n");
+}
+
static struct tracer power_tracer __read_mostly =
{
.name = "power",
@@ -194,6 +200,7 @@
.stop = stop_power_trace,
.reset = power_trace_reset,
.print_line = power_print_line,
+ .print_header = power_print_header,
};
static int init_power_trace(void)
