Re: [PATCH] perf tools: Synthesize GROUP_DESC feature in pipe mode

[Jiri Olsa <jolsa@redhat.com>]

On Thu, Jul 12, 2018 at 09:34:45AM -0700, Stephane Eranian wrote:
> Hi Jiri,
> On Thu, Jul 12, 2018 at 6:52 AM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > Stephan reported, that pipe mode does not carry the group
> > information and thus the piped report won't display the
> > grouped output for following command:
> >
> Thanks for fixing this quickly.

could I have your tested/acked by?

> I think we should have more testing on the pipe mode, in general.

yea, we should

jirka

> 
> >   # perf record -e '{cycles,instructions,branches}' -a sleep 4 | perf report
> >
> > It has no idea about the group setup, so it will display
> > events separately:
> >
> >   # Overhead  Command          Shared Object             ...
> >   # ........  ...............  .......................
> >   #
> >        6.71%  swapper          [kernel.kallsyms]
> >        2.28%  offlineimap      libpython2.7.so.1.0
> >        0.78%  perf             [kernel.kallsyms]
> >   ...
> >
> > Fixing GROUP_DESC feature record to be synthesized in pipe mode,
> > so the report output is grouped if there's group defined in record:
> >
> >   #                 Overhead  Command          Shared    ...
> >   # ........................  ...............  .......
> >   #
> >        7.57%   0.16%   0.30%  swapper          [kernel
> >        1.87%   3.15%   2.46%  offlineimap      libpyth
> >        1.33%   0.00%   0.00%  perf             [kernel
> >   ...
> >
> > Cc: David Carrillo-Cisneros <davidcc@google.com>
> > Reported-by: Stephane Eranian <eranian@google.com>
> > Link: http://lkml.kernel.org/n/tip-ybqyh8ac4g173iy3xt4pxnlo@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > ---
> >  tools/perf/util/header.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> > index 59fcc790c865..af9aaf28f976 100644
> > --- a/tools/perf/util/header.c
> > +++ b/tools/perf/util/header.c
> > @@ -2587,7 +2587,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
> >         FEAT_OPR(NUMA_TOPOLOGY, numa_topology,  true),
> >         FEAT_OPN(BRANCH_STACK,  branch_stack,   false),
> >         FEAT_OPR(PMU_MAPPINGS,  pmu_mappings,   false),
> > -       FEAT_OPN(GROUP_DESC,    group_desc,     false),
> > +       FEAT_OPR(GROUP_DESC,    group_desc,     false),
> >         FEAT_OPN(AUXTRACE,      auxtrace,       false),
> >         FEAT_OPN(STAT,          stat,           false),
> >         FEAT_OPN(CACHE,         cache,          true),
> > --
> > 2.17.1
> >