linux-kernel - Re: [PATCH 2/3] perf test: Cleanup daemon if test is interrupted.

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Date:   Thu, 11 Mar 2021 20:03:31 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf test: Cleanup daemon if test is interrupted.

On Thu, Mar 11, 2021 at 08:18:27AM -0800, Ian Rogers wrote:
> On Thu, Mar 11, 2021 at 2:38 AM Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Wed, Mar 10, 2021 at 12:41:17PM -0800, Ian Rogers wrote:
> > > Reorder daemon_start and daemon_exit as the trap handler is added in
> > > daemon_start referencing daemon_exit.
> >
> > makes sense, minor comments below
> >
> > >
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > ---
> > >  tools/perf/tests/shell/daemon.sh | 34 +++++++++++++++++++-------------
> > >  1 file changed, 20 insertions(+), 14 deletions(-)
> > >
> > > diff --git a/tools/perf/tests/shell/daemon.sh b/tools/perf/tests/shell/daemon.sh
> > > index 66ad56b4e0a5..a02cedc76de6 100755
> > > --- a/tools/perf/tests/shell/daemon.sh
> > > +++ b/tools/perf/tests/shell/daemon.sh
> > > @@ -98,6 +98,23 @@ check_line_other()
> > >       fi
> > >  }
> > >
> > > +daemon_exit()
> > > +{
> > > +     local config=$1
> > > +
> > > +     local line=`perf daemon --config ${config} -x: | head -1`
> > > +     local pid=`echo "${line}" | awk 'BEGIN { FS = ":" } ; { print $1 }'`
> > > +
> > > +        # Reset trap handler.
> > > +        trap - SIGINT SIGTERM
> >
> > please keep the 'tabs' in here
> >
> > > +
> > > +     # stop daemon
> > > +     perf daemon stop --config ${config}
> > > +
> > > +     # ... and wait for the pid to go away
> > > +     tail --pid=${pid} -f /dev/null
> > > +}
> > > +
> > >  daemon_start()
> > >  {
> > >       local config=$1
> > > @@ -105,6 +122,9 @@ daemon_start()
> > >
> > >       perf daemon start --config ${config}
> > >
> > > +        # Clean up daemon if interrupted.
> > > +        trap "daemon_exit ${config}; exit 4" SIGINT SIGTERM
> >
> > ditto, plus let's document exit values somewhere in comments,
> > I think the next patch is adding exit 62, so that one as well
> 
> Thanks, it might be easier to just have these as exit 1 - I pulled
> values from the errno list. Do you have any preferences?

yep, exit 1 seems enough

jirka