Commit 52e68924 authored Feb 05, 2015 by Wang Long Committed by Jonathan Corbet Feb 09, 2015

Documentation: Fix the wrong command `echo -1 > set_ftrace_pid` for cleaning the filter.



The command `echo > set_ftrace_pid` should be used to clean the filter quietly.
because the command `echo -1 >  set_ftrace_pid` will output the following:
"bash: echo: write error: Invalid argument".

so update the file Documentation/trace/ftrace.txt.

Signed-off-by: Wang Long <long.wanglong@huawei.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

parent 67c47cfc

Documentation/trace/ftrace.txt

+1 −1

Original line number	Diff line number	Diff line
		@@ -1740,7 +1740,7 @@ no pid
		yum-updatesd-3111 [003] 1637.254683: lock_hrtimer_base <-hrtimer_try_to_cancel
		yum-updatesd-3111 [003] 1637.254685: fget_light <-do_sys_poll
		yum-updatesd-3111 [003] 1637.254686: pipe_poll <-do_sys_poll
		# echo -1 > set_ftrace_pid
		# echo > set_ftrace_pid
		# cat trace \|head
		# tracer: function
		#