Re: [PATCH] generic/019: kill background processes on interrupt

[Zorro Lang <zlang@redhat.com>]

On Wed, Apr 13, 2022 at 10:26:56AM +1000, Dave Chinner wrote:
> On Tue, Apr 12, 2022 at 10:25:00PM +0800, Zorro Lang wrote:
> > On Tue, Apr 12, 2022 at 02:59:42PM +0200, David Disseldorp wrote:
> > > On Mon, 11 Apr 2022 15:48:33 +1000, Dave Chinner wrote:
> > > 
> > > > From: Dave Chinner <dchinner@redhat.com>
> > > > 
> > > > If you ctrl-c generic/019, it leaves fsstress processes running.
> > > > Kill them in the cleanup function so that they don't have to be
> > > > manually killed after interrupting the test.
> > > > 
> > > > While touching the _cleanup() function, make it do everything that
> > > > the generic _cleanup function it overrides does and fix the
> > > > indenting.
> > > > 
> > > > Signed-off-by: Dave Chinner <dchinner@redhat.com>
> > > > ---
> > > >  tests/generic/019 | 6 ++++--
> > > >  1 file changed, 4 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/tests/generic/019 b/tests/generic/019
> > > > index db56dac1..cda107f4 100755
> > > > --- a/tests/generic/019
> > > > +++ b/tests/generic/019
> > > > @@ -53,8 +53,10 @@ stop_fail_scratch_dev()
> > > >  # Override the default cleanup function.
> > > >  _cleanup()
> > > >  {
> > > > -    disallow_fail_make_request
> > > > -    rm -f $tmp.*
> > > > +	kill $fs_pid $fio_pid &> /dev/null
> > > > +	disallow_fail_make_request
> > > > +	cd /
> > > > +	rm -r -f $tmp.*
> > > >  }
> > > >  
> > > >  RUN_TIME=$((20+10*$TIME_FACTOR))
> > > 
> > > Might be worth unset'ing the "fs_pid" and "fio_pid" variables after the
> > > wait, but should be fine as-is:
> > 
> > I agree. Better to avoid killing other system processes. Or how about this place
> > does (avoid killing system useful processes):
> > $KILLALL_PROG -q $FSSTRESS_PROG
> > $KILLALL_PROG -q $FIO_PROG
> > 
> > Another picky question is, do we need to use a while loop checking, until the
> > processes really get killed? :)
> 
> Do we really need to paint the bikeshed over how best to kill a
> process? I don't have time to do that, this is just a drive-by fix
> that works for me....

Sure Dave:) The while loop checking is a little picky, I just ask what do you think, no
objection if you don't like that. Due to quick cleanup and exit is a good reason too.

I think it might be worth doing "$KILLALL_PROG -q $FSSTRESS_PROG $FIO_PROG" at least, to
avoid killing other processes might be useful. Or as David Disseldorp suggested "unset'ing
the "fs_pid" and "fio_pid" variables after the wait. If you're busy, I can help to make
this simple change, no push :-D

Thanks,
Zorro

> 
> -Dave.
> -- 
> Dave Chinner
> david@fromorbit.com
>