Re: [PATCH v1 1/2] perf metrics: Avoid segv if default metricgroup isn't set

[Ian Rogers <irogers@google.com>]

On Mon, Dec 4, 2023 at 7:33 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> Hello,
>
> On Mon, Dec 4, 2023 at 2:45 PM Ilkka Koskinen
> <ilkka@os.amperecomputing.com> wrote:
> >
> >
> >
> > On Mon, 4 Dec 2023, Ian Rogers wrote:
> > > A metric is default by having "Default" within its groups. The default
> > > metricgroup name needn't be set and this can result in segv in
> > > default_metricgroup_cmp and perf_stat__print_shadow_stats_metricgroup
> > > that assume it has a value when there is a Default metric group. To
> > > avoid the segv initialize the value to "".
> > >
> > > Fixes: 1c0e47956a8e ("perf metrics: Sort the Default metricgroup")
> > > Signed-off-by: Ian Rogers <irogers@google.com>
> >
> > Thanks! I was going to look for the bug but got pulled to other
> > tasks. The patch looks good to me and I tested it successfully on
> > AmpereOne.
> >
> >    Reviewed-and-tested-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
>
> Looks like it needs to go through perf-tools for v6.7.
> Ian, do you think this one is enough?

From a user's pov the json fix is nicer as otherwise perf stat output
for the relevant metrics lacks a heading on the left. This fix is
smaller. I'm easy about which to take :-)

Thanks,
Ian

> Thanks,
> Namhyung