linux-kernel - Re: [PATCH 23/24] perf buildid-list: Add support for mmap2's buildid events

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Message-ID: <20201117152140.GE1216482@krava>
Date:   Tue, 17 Nov 2020 16:21:40 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 23/24] perf buildid-list: Add support for mmap2's buildid
 events

On Tue, Nov 17, 2020 at 09:50:40AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 17, 2020 at 12:00:52PM +0100, Jiri Olsa escreveu:
> > Add buildid-list support for mmap2's build id data, so we can
> > display build ids for dso objects for data without the build
> > id cache update.
> 
> >   $ perf buildid-list
> >   1805c738c8f3ec0f47b7ea09080c28f34d18a82b /usr/lib64/ld-2.31.so
> >   d278249792061c6b74d1693ca59513be1def13f2 /usr/lib64/libc-2.31.so
> > 
> > By default only dso objects with hits are shown.
> 
> Would be interesting to be able to show all the build ids that are
> there. a 'perf buildid-list --all' or make this under --force?

ok, will check.. one other tool I think would be handy is
to show which debuginfo is not available, because it can
change the report a lot - missing symbols are not getting
accounted, and their hits are accounted only as separated
addresses

jirka

> 
> - Arnaldo
>  
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/builtin-buildid-list.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
> > index e3ef75583514..87f5b1a4a7fa 100644
> > --- a/tools/perf/builtin-buildid-list.c
> > +++ b/tools/perf/builtin-buildid-list.c
> > @@ -77,6 +77,9 @@ static int perf_session__list_build_ids(bool force, bool with_hits)
> >  	    perf_header__has_feat(&session->header, HEADER_AUXTRACE))
> >  		with_hits = false;
> >  
> > +	if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID))
> > +		with_hits = true;
> > +
> >  	/*
> >  	 * in pipe-mode, the only way to get the buildids is to parse
> >  	 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
> > -- 
> > 2.26.2
> > 
> 
> -- 
> 
> - Arnaldo
>