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SubjectRe: [PATCH 3/3] perf inject: Do not load map/dso when injecting build-id
On Tue, Sep 15, 2020 at 7:05 PM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Mon, Sep 14, 2020 at 11:18:59PM +0900, Namhyung Kim wrote:
> > No need to load symbols in a DSO when injecting build-id. I guess the
> > reason was to check the DSO is a special file like anon files. Use
> > some helper functions in map.c to check them before reading build-id.
> > Also pass sample event's cpumode to a new build-id event.
> >
> > Original-patch-by: Stephane Eranian <eranian@google.com>
> > Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> > ---
> > tools/perf/builtin-inject.c | 30 ++++++++++--------------------
> > tools/perf/util/map.c | 17 +----------------
> > tools/perf/util/map.h | 14 ++++++++++++++
> > 3 files changed, 25 insertions(+), 36 deletions(-)
> >
> > diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> > index a2804d906d2a..6d4e6833efed 100644
> > --- a/tools/perf/builtin-inject.c
> > +++ b/tools/perf/builtin-inject.c
> > @@ -436,21 +436,22 @@ static int dso__read_build_id(struct dso *dso)
> > }
> >
> > static int dso__inject_build_id(struct dso *dso, struct perf_tool *tool,
> > - struct machine *machine)
> > + struct machine *machine, u8 cpumode)
> > {
> > - u16 misc = PERF_RECORD_MISC_USER;
> > int err;
> >
> > + if (is_anon_memory(dso->long_name))
> > + return 0;
> > + if (is_no_dso_memory(dso->long_name))
> > + return 0;
>
> should we check for vdso as well? I don't think it has build id

I don't know.. But I guess there's no reason it shouldn't?


>
> > +
> > if (dso__read_build_id(dso) < 0) {
> > pr_debug("no build_id found for %s\n", dso->long_name);
> > return -1;
> > }
> >
> > - if (dso->kernel)
> > - misc = PERF_RECORD_MISC_KERNEL;
> > -
> > - err = perf_event__synthesize_build_id(tool, dso, misc, perf_event__repipe,
> > - machine);
> > + err = perf_event__synthesize_build_id(tool, dso, cpumode,
> > + perf_event__repipe, machine);
> > if (err) {
> > pr_err("Can't synthesize build_id event for %s\n", dso->long_name);
> > return -1;
> > @@ -478,19 +479,8 @@ static int perf_event__inject_buildid(struct perf_tool *tool,
> > if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) {
> > if (!al.map->dso->hit) {
> > al.map->dso->hit = 1;
> > - if (map__load(al.map) >= 0) {
>
> nice, that might do some nice speedup, did you see any?

Yes, I believe so. But my quick test on a laptop was too short.
I will test it again and share the speedup.

Thanks
Namhyung


>
> jirka
>
> > - dso__inject_build_id(al.map->dso, tool, machine);
> > - /*
> > - * If this fails, too bad, let the other side
> > - * account this as unresolved.
> > - */
> > - } else {
> > -#ifdef HAVE_LIBELF_SUPPORT
> > - pr_warning("no symbols found in %s, maybe "
> > - "install a debug package?\n",
> > - al.map->dso->long_name);
> > -#endif
> > - }
> > + dso__inject_build_id(al.map->dso, tool, machine,
> > + sample->cpumode);
> > }
>
> SNIP
>

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