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SubjectRe: [PATCH v2 11/14] ftrace/selftest: Have the reset_trigger code be a bit more careful
On Wed, 16 May 2018 10:00:04 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Wed, 16 May 2018 21:53:50 +0900
> Masami Hiramatsu <mhiramat@kernel.org> wrote:
>
> > On Mon, 14 May 2018 16:58:56 -0400
> > Steven Rostedt <rostedt@goodmis.org> wrote:
> >
> > > From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
> > >
> > > The trigger code is picky in how it can be disabled as there may be
> > > dependencies between different events and synthetic events. Change the order
> > > on how triggers are reset.
> > >
> > > 1) Reset triggers of all synthetic events first
> > > 2) Remove triggers with actions attached to them
> > > 3) Remove all other triggers
> > >
> > > If this order isn't followed, then some triggers will not be reset, and an
> > > error may happen because a trigger is busy.
> >
> > Ah, right!
> >
> > Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
>
> Thanks!
>
> >
> > I think this should go into stable tree too.
>
> I wonder if I should break this into two patches then.
>
> One for the actions before attached, and one for synthetic events?
>
> Hmm, maybe not. As it can handle not having synthetic events, it should
> be OK to let the update go to a time when they were not there.
>
> Thoughts?

I think the latest test-set can be run on the any stable kernel,
and this correctly checks existence of the knob, so you don't need
to split it.

Thank you,

>
> -- Steve
>
> >
> > Thank you!
> >
> > >
> > > Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> > > ---
> > > .../testing/selftests/ftrace/test.d/functions | 21 ++++++++++++++++---
> > > 1 file changed, 18 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> > > index 2a4f16fc9819..8393b1c06027 100644
> > > --- a/tools/testing/selftests/ftrace/test.d/functions
> > > +++ b/tools/testing/selftests/ftrace/test.d/functions
> > > @@ -15,14 +15,29 @@ reset_tracer() { # reset the current tracer
> > > echo nop > current_tracer
> > > }
> > >
> > > -reset_trigger() { # reset all current setting triggers
> > > - grep -v ^# events/*/*/trigger |
> > > +reset_trigger_file() {
> > > + # remove action triggers first
> > > + grep -H ':on[^:]*(' $@ |
> > > + while read line; do
> > > + 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 $line | cut -f2- -d: | cut -f1 -d" "`
> > > - echo "!$cmd" > `echo $line | cut -f1 -d:`
> > > + file=`echo $line | cut -f1 -d:`
> > > + echo "!$cmd" > $file
> > > done
> > > }
> > >
> > > +reset_trigger() { # reset all current setting triggers
> > > + if [ -d events/synthetic ]; then
> > > + reset_trigger_file events/synthetic/*/trigger
> > > + fi
> > > + reset_trigger_file events/*/*/trigger
> > > +}
> > > +
> > > reset_events_filter() { # reset all current setting filters
> > > grep -v ^none events/*/*/filter |
> > > while read line; do
> > > --
> > > 2.17.0
> > >
> > >
> >
> >
>


--
Masami Hiramatsu <mhiramat@kernel.org>

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