linux-kernel - Re: [PATCH v2 12/14] ftrace/selftest: Fix reset_trigger() to handle triggers with filters

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Date:   Wed, 16 May 2018 21:56:12 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Clark Williams <williams@...hat.com>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Brendan Gregg <bgregg@...flix.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Yann Ylavic <ylavic.dev@...il.com>,
        linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v2 12/14] ftrace/selftest: Fix reset_trigger() to handle
 triggers with filters

On Mon, 14 May 2018 16:58:57 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> The reset_trigger() function breaks up the command by a space ' '. This is
> useful to ignore the '[active]' word for triggers when removing them. But if
> the trigger has a filter (ie. "if prio < 10") then the filter needs to be
> attached to the line that is written into the trigger file to remove it. But
> the truncation removes the filter and the triggers are not cleared properly.
> 
> Before, reset_trigger() did this:
> 
>  # echo 'hist:keys=common_pid if prev_prio < 10' > events/sched/sched_switch/trigger
>  # echo 'hist:keys=common_pid if next_prio < 10' >> events/sched/sched_switch/trigger
>  # cat events/sched/sched_switch/trigger
> hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if prev_prio < 10 [active]
> hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if next_prio < 10 [active]
> 
>  reset_trigger() {
>    echo '!hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048' >> events/sched/sched_switch/trigger
>  }
> 
>  # cat events/sched/sched_switch/trigger
> hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if prev_prio < 10 [active]
> hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if next_prio < 10 [active]
> 
> After, where it includes the filter:
> 
>  reset_trigger() {
>    echo '!hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if prev_prio < 10' >> events/sched/sched_switch/trigger
>  }
> 
>  # cat events/sched/sched_switch/trigger
> hist:keys=common_pid:vals=hitcount:sort=hitcount:size=2048 if next_prio < 10 [active]
> 

This also looks good to me and needs to go into stable.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you,


> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  tools/testing/selftests/ftrace/test.d/functions | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> index 8393b1c06027..e4645d5e3126 100644
> --- a/tools/testing/selftests/ftrace/test.d/functions
> +++ b/tools/testing/selftests/ftrace/test.d/functions
> @@ -19,13 +19,13 @@ reset_trigger_file() {
>      # remove action triggers first
>      grep -H ':on[^:]*(' $@ |
>      while read line; do
> -        cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "`
> +        cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
>  	file=`echo $line | cut -f1 -d:`
>  	echo "!$cmd" >> $file
>      done
>      grep -Hv ^# $@ |
>      while read line; do
> -        cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "`
> +        cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
>  	file=`echo $line | cut -f1 -d:`
>  	echo "!$cmd" > $file
>      done
> -- 
> 2.17.0
> 
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>