The canonical location for the tracefs filesystem is at
/sys/kernel/tracing.
But, from Documentation/trace/ftrace.rst:
Before 4.1, all ftrace tracing control files were within the debugfs
file system, which is typically located at /sys/kernel/debug/tracing.
For backward compatibility, when mounting the debugfs file system,
the tracefs file system will be automatically mounted at:
/sys/kernel/debug/tracing
Update the visl decoder driver documentation to use this tracefs path.
Signed-off-by: Ross Zwisler <zwisler@google.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
.. code-block:: bash
- $ ls /sys/kernel/debug/tracing/events/ | grep visl
+ $ ls /sys/kernel/tracing/events/ | grep visl
visl_fwht_controls
visl_h264_controls
visl_hevc_controls
.. code-block:: bash
- $ echo 1 > /sys/kernel/debug/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
+ $ echo 1 > /sys/kernel/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
The SPS data will be dumped to the trace buffer, i.e.:
.. code-block:: bash
- $ cat /sys/kernel/debug/tracing/trace
+ $ cat /sys/kernel/tracing/trace
video_parameter_set_id 0
seq_parameter_set_id 0
pic_width_in_luma_samples 1920