linux-kernel - Re: [PATCH 2/2] perf annotate: Update dso binary type when try build-id

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Date: Thu, 25 Apr 2024 07:50:03 -0700
From: Ian Rogers <irogers@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 2/2] perf annotate: Update dso binary type when try build-id

On Thu, Apr 25, 2024 at 7:12 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> On Wed, Apr 24, 2024 at 05:51:57PM -0700, Namhyung Kim wrote:
> > dso__disassemble_filename() tries to get the filename for objdump (or
> > capstone) using build-id.  But I found sometimes it didn't disassemble
> > some functions.  It turned out that those functions belong to a dso
> > which has no binary type set.  It seems it sets the binary type for some
> > special files only - like kernel (kallsyms or kcore) or BPF images.  And
> > there's a logic to skip dso with DSO_BINARY_TYPE__NOT_FOUND.
> >
> > As it's checked the build-id cache linke, it should set the binary type
> > as DSO_BINARY_TYPE__BUILD_ID_CACHE.
> >
> > Fixes: 873a83731f1c ("perf annotate: Skip DSOs not found")
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/disasm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
> > index 412101f2cf2a..6d1125e687b7 100644
> > --- a/tools/perf/util/disasm.c
> > +++ b/tools/perf/util/disasm.c
> > @@ -1156,6 +1156,8 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
> >                       }
> >               }
> >               mutex_unlock(&dso->lock);
> > +     } else if (dso->binary_type == DSO_BINARY_TYPE__NOT_FOUND) {
> > +             dso->binary_type = DSO_BINARY_TYPE__BUILD_ID_CACHE;
> >       }
> >
> >       free(build_id_path);
>
> Fixed up to take into account a recent patch by Ian that turned that
> &dso->lock into dso__lock(dso):
>
> diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
> index 70650808e2e7bf88..2921b32357705a02 100644
> --- a/tools/perf/util/disasm.c
> +++ b/tools/perf/util/disasm.c
> @@ -1156,6 +1156,8 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
>                         }
>                 }
>                 mutex_unlock(dso__lock(dso));
> +       } else if (dso->binary_type == DSO_BINARY_TYPE__NOT_FOUND) {

With reference count checking on dsos, this will need to be:

dso__binary_type(dso)

too.

Thanks,
Ian

> +               dso->binary_type = DSO_BINARY_TYPE__BUILD_ID_CACHE;
>         }
>
>         free(build_id_path);