linux-kernel - Re: [PATCH 2/2] perf script: Don't disable use

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Date:	Mon, 15 Aug 2016 13:24:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Hekuang <hekuang@...wei.com>
Cc:	peterz@...radead.org, mingo@...hat.com,
	alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf script: Don't disable use_callchain if input is
 pipe

Em Mon, Aug 15, 2016 at 06:25:15PM +0800, Hekuang escreveu:
> ping.

Thanks, tested and applied both patches.

- Arnaldo
 
> 在 2016/8/4 19:25, He Kuang 写道:
> > Because perf data from pipe do not have a header with evsel attr, we
> > should not check that and disable symbol_conf.use_callchain. Otherwise,
> > perf script won't show callchains even if the data stream contains
> > callchain.
> > 
> > Before:
> >    $ perf record -g -o - uname |perf script
> >    Linux
> >    [ perf record: Woken up 1 times to write data ]
> >    [ perf record: Captured and wrote 0.000 MB - ]
> >    uname  1828 182630.186578:  250000 cpu-clock:  ..b9499 setup_arg_pages
> >    uname  1828 182630.186850:  250000 cpu-clock:  ..83b20 ___might_sleep
> >    uname  1828 182630.187153:  250000 cpu-clock:  ..4b6be file_map_prot_ch
> >    ...
> > 
> > After:
> >    $ perf record -g -o - uname |perf script
> >    Linux
> >    [ perf record: Woken up 1 times to write data ]
> >    [ perf record: Captured and wrote 0.000 MB - ]
> >    uname  1833 182675.927099:     250000 cpu-clock:
> >                    ba5520 _raw_spin_lock+0xfe200040 ([kernel.kallsyms])
> >                    389dd4 expand_downwards+0xfe200154 ([kernel.kallsyms])
> >                    389f34 expand_stack+0xfe200024 ([kernel.kallsyms])
> >                    3b957e setup_arg_pages+0xfe20019e ([kernel.kallsyms])
> >                    40c80f load_elf_binary+0xfe20042f ([kernel.kallsyms])
> >                    ...
> > 
> > Signed-off-by: He Kuang <hekuang@...wei.com>
> > ---
> >   tools/perf/builtin-script.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> > index d47aef9..ec8df8f 100644
> > --- a/tools/perf/builtin-script.c
> > +++ b/tools/perf/builtin-script.c
> > @@ -371,14 +371,16 @@ static int perf_session__check_output_opt(struct perf_session *session)
> >   	if (!no_callchain) {
> >   		bool use_callchain = false;
> > +		bool not_pipe = false;
> >   		evlist__for_each_entry(session->evlist, evsel) {
> > +			not_pipe = true;
> >   			if (evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) {
> >   				use_callchain = true;
> >   				break;
> >   			}
> >   		}
> > -		if (!use_callchain)
> > +		if (not_pipe && !use_callchain)
> >   			symbol_conf.use_callchain = false;
> >   	}
>