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docs: ftrace: fix the wrong path of tracefs 

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>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Zhaoyu Liu 2021-11-13 21:37:34 +08:00 committed by Jonathan Corbet
parent 738943fab8
commit 951e0d0020
1 changed files with 4 additions and 5 deletions
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9
Documentation/trace/ftrace.rst
View File

@ -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 > $tracefs/tracing_on
exec "$@"