[PATCH] docs: ftrace: fix the wrong path of tracefs

[PATCH] docs: ftrace: fix the wrong path of tracefs

[Zhaoyu Liu]

Delete "tracing" due to it has been included in /proc/mounts.
Delete "echo nop > $tracefs/tracing/current_tracer", maybe
this command is redundant.

Signed-off-by: Zhaoyu Liu <zackary.liu.pro@gmail.com>
---
 Documentation/trace/ftrace.rst | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 4e5b26f03d5b..b3166c4a7867 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -2442,11 +2442,10 @@ Or this simple script!
   #!/bin/bash
 
   tracefs=`sed -ne 's/^tracefs \(.*\) tracefs.*/\1/p' /proc/mounts`
-  echo nop > $tracefs/tracing/current_tracer
-  echo 0 > $tracefs/tracing/tracing_on
-  echo $$ > $tracefs/tracing/set_ftrace_pid
-  echo function > $tracefs/tracing/current_tracer
-  echo 1 > $tracefs/tracing/tracing_on
+  echo 0 > $tracefs/tracing_on
+  echo $$ > $tracefs/set_ftrace_pid
+  echo function > $tracefs/current_tracer
+  echo 1 > $tracefs/tracing_on
   exec "$@"
 
 
-- 
2.17.1

Re: [PATCH] docs: ftrace: fix the wrong path of tracefs

[Steven Rostedt]

On Sat, 13 Nov 2021 21:37:34 +0800
Zhaoyu Liu <zackary.liu.pro@gmail.com> wrote:

> Delete "tracing" due to it has been included in /proc/mounts.
> Delete "echo nop > $tracefs/tracing/current_tracer", maybe
> this command is redundant.
> 
> Signed-off-by: Zhaoyu Liu <zackary.liu.pro@gmail.com>

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

Jon,

Can you take this through your tree?

Thanks,

-- Steve


> ---
>  Documentation/trace/ftrace.rst | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
> index 4e5b26f03d5b..b3166c4a7867 100644
> --- a/Documentation/trace/ftrace.rst
> +++ b/Documentation/trace/ftrace.rst
> @@ -2442,11 +2442,10 @@ Or this simple script!
>    #!/bin/bash
>  
>    tracefs=`sed -ne 's/^tracefs \(.*\) tracefs.*/\1/p' /proc/mounts`
> -  echo nop > $tracefs/tracing/current_tracer
> -  echo 0 > $tracefs/tracing/tracing_on
> -  echo $$ > $tracefs/tracing/set_ftrace_pid
> -  echo function > $tracefs/tracing/current_tracer
> -  echo 1 > $tracefs/tracing/tracing_on
> +  echo 0 > $tracefs/tracing_on
> +  echo $$ > $tracefs/set_ftrace_pid
> +  echo function > $tracefs/current_tracer
> +  echo 1 > $tracefs/tracing_on
>    exec "$@"
>  
>  

Re: [PATCH] docs: ftrace: fix the wrong path of tracefs

[Jonathan Corbet]

Steven Rostedt <rostedt@goodmis.org> writes:

> On Sat, 13 Nov 2021 21:37:34 +0800
> Zhaoyu Liu <zackary.liu.pro@gmail.com> wrote:
>
>> Delete "tracing" due to it has been included in /proc/mounts.
>> Delete "echo nop > $tracefs/tracing/current_tracer", maybe
>> this command is redundant.
>> 
>> Signed-off-by: Zhaoyu Liu <zackary.liu.pro@gmail.com>
>
> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
>
> Jon,
>
> Can you take this through your tree?

Applied, thanks.

jon