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Message-ID: <20160107204205.GH18457@kernel.org>
Date: Thu, 7 Jan 2016 17:42:05 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
lkml <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Noel Grandin <noelgrandin@...il.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCHv3 06/13] perf record: Store data mmaps for dwarf unwind
Em Thu, Jan 07, 2016 at 02:30:22PM +0100, Jiri Olsa escreveu:
> On Thu, Jan 07, 2016 at 10:14:14PM +0900, Namhyung Kim wrote:
> > On Thu, Jan 07, 2016 at 01:39:28PM +0100, Jiri Olsa wrote:
> > > Currently we don't synthesize data mmap by default. It depends
> > > on -d option, that enables data address sampling.
> > >
> > > But we've seen cases (softice) where DWARF unwinder went through
> > > non executable mmaps, which we need to lookup in MAP__VARIABLE tree.
> > >
> > > Making data mmaps to be synthesized for dwarf unwind as well.
> > >
> > > Reported-by: Noel Grandin <noelgrandin@...il.com>
> > > Link: http://lkml.kernel.org/n/tip-lh02yir6qfycn8zr892rmlgg@git.kernel.org
> > > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > > ---
> > > tools/perf/builtin-record.c | 5 ++++-
> > > 1 file changed, 4 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > > index 9c5cdc2c4471..465bde77f49b 100644
> > > --- a/tools/perf/builtin-record.c
> > > +++ b/tools/perf/builtin-record.c
> > > @@ -815,8 +815,11 @@ int record_parse_callchain_opt(const struct option *opt,
> > > }
> > >
> > > ret = parse_callchain_record_opt(arg, &callchain_param);
> > > - if (!ret)
> > > + if (!ret) {
> > > + /* Enable data address sampling for DWARF unwind. */
> > > + record->sample_address = true;
> >
> > How does it guarantee that it enables data address sampling only for
> > DWARF unwind? Maybe you want this?
> >
> > if (callchain_param.record_mode == CALLCHAIN_DWARF)
> > record->sample_address = true;
>
> ugh.. too much coofee.. :-\ third time's a charm, v3 attached
Noel, have you tested this latest patch? Does it fix things for you in
this latest iteration?
If so, can I stick a "Reported-and-Tested-by: Noel Grandin <>" to this?
> thanks,
> jirka
>
>
> ---
> Currently we don't synthesize data mmap by default. It depends
> on -d option, that enables data address sampling.
>
> But we've seen cases (softice) where DWARF unwinder went through
> non executable mmaps, which we need to lookup in MAP__VARIABLE tree.
>
> Making data mmaps to be synthesized for dwarf unwind as well.
>
> Reported-by: Noel Grandin <noelgrandin@...il.com>
> Link: http://lkml.kernel.org/n/tip-lh02yir6qfycn8zr892rmlgg@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> tools/perf/builtin-record.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 9c5cdc2c4471..dc4e0adf5c5b 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -815,8 +815,12 @@ int record_parse_callchain_opt(const struct option *opt,
> }
>
> ret = parse_callchain_record_opt(arg, &callchain_param);
> - if (!ret)
> + if (!ret) {
> + /* Enable data address sampling for DWARF unwind. */
> + if (callchain_param.record_mode == CALLCHAIN_DWARF)
> + record->sample_address = true;
> callchain_debug();
> + }
>
> return ret;
> }
> --
> 2.4.3
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