linux-kernel - Re: [PATCH] perf tools: Synthesize GROUP

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Date:   Thu, 12 Jul 2018 23:18:05 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf tools: Synthesize GROUP_DESC feature in pipe mode

Hi Jiri,
On Thu, Jul 12, 2018 at 9:49 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> 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@...nel.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?
>
Acked-by: Stephane Eranian <eranian@...gle.com>

> > 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@...gle.com>
> > > Reported-by: Stephane Eranian <eranian@...gle.com>
> > > Link: http://lkml.kernel.org/n/tip-ybqyh8ac4g173iy3xt4pxnlo@git.kernel.org
> > > Signed-off-by: Jiri Olsa <jolsa@...nel.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
> > >