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-rw-r--r--scripts/tracing/draw_functrace.py7
1 files changed, 3 insertions, 4 deletions
diff --git a/scripts/tracing/draw_functrace.py b/scripts/tracing/draw_functrace.py
index 902f9a992620..db40fa04cd51 100644
--- a/scripts/tracing/draw_functrace.py
+++ b/scripts/tracing/draw_functrace.py
@@ -12,10 +12,9 @@ calls. Only the functions's names and the the call time are provided.
12 12
13Usage: 13Usage:
14 Be sure that you have CONFIG_FUNCTION_TRACER 14 Be sure that you have CONFIG_FUNCTION_TRACER
15 # mkdir /debugfs 15 # mount -t debugfs nodev /sys/kernel/debug
16 # mount -t debug debug /debug 16 # echo function > /sys/kernel/debug/tracing/current_tracer
17 # echo function > /debug/tracing/current_tracer 17 $ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func
18 $ cat /debug/tracing/trace_pipe > ~/raw_trace_func
19 Wait some times but not too much, the script is a bit slow. 18 Wait some times but not too much, the script is a bit slow.
20 Break the pipe (Ctrl + Z) 19 Break the pipe (Ctrl + Z)
21 $ scripts/draw_functrace.py < raw_trace_func > draw_functrace 20 $ scripts/draw_functrace.py < raw_trace_func > draw_functrace