linux-kernel - Re: [PATCH 2/3] tracing/kselftests: Remove triggers with references before their definitions

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Date:   Wed, 27 Oct 2021 16:26:00 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     surenb@...gle.com, hridya@...gle.com, namhyung@...nel.org,
        kernel-team@...roid.com, rostedt@...dmis.org,
        Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuah@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/3] tracing/kselftests: Remove triggers with references
 before their definitions

On Wed, Oct 27, 2021 at 2:58 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> Hi Kalesh,
>
> On Wed, 27 Oct 2021 13:59:09 -0700
> Kalesh Singh <kaleshsingh@...gle.com> wrote:
>
> > If an event trigger references a variable defined in another trigger, it
> > has to be removed before the trigger that defines the variable is
> > removed.
> >
> > Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
> > ---
> >  tools/testing/selftests/ftrace/test.d/functions | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> > index 000fd05e84b1..bd9e85f4d626 100644
> > --- a/tools/testing/selftests/ftrace/test.d/functions
> > +++ b/tools/testing/selftests/ftrace/test.d/functions
> > @@ -22,6 +22,15 @@ reset_trigger_file() {
> >       file=`echo $line | cut -f1 -d:`
> >       echo "!$cmd" >> $file
> >      done
> > +
> > +    # remove triggers with references next
> > +    grep -H '\$' $@ |
> > +    while read line; do
> > +        cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
> > +     file=`echo $line | cut -f1 -d:`
> > +     echo "!$cmd" >> $file
> > +    done
> > +
>
> Why don't you use 'tac'? I love that idea :)
> Did you find any issue?

Hi Masami,

Thanks for the reviews. As with the first set of patches using tac
gives a regression here, though I'm not sure why it doesn't work -- I
also thought reversing the order would handle any dependencies
correctly.

- Kalesh
>
> I think the function which cleaning up the tracing file should use
> the 'tac' rollback method, because it is natural, simple and robust.
> Then the first loop for removing action triggers is not needed anymore.
>
> Thank you,
>
> >      grep -Hv ^# $@ |
> >      while read line; do
> >          cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
> > --
> > 2.33.0.1079.g6e70778dc9-goog
> >
>
>
> --
> Masami Hiramatsu <mhiramat@...nel.org>