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Subject[PATCH 7/7] perf inject: Remove stale build-id processing
I think we don't need to call build_id__mark_dso_hit() in the
perf_event__repipe_sample() as it's not used by -b option. In case of
the -b option is used, it uses perf_event__inject_buildid() instead.
This can remove unnecessary overhead of finding thread/map for each
sample event.

Also I suspect HEADER_BUILD_ID feature bit setting since we already
generated/injected BUILD_ID event into the output stream. So this
header information seems redundant. I'm not 100% sure about the
auxtrace usage, but it looks like not related to this directly.

And we now have --buildid-all so users can get the same behavior if
they want.

Cc: Adrian Hunter <>
Signed-off-by: Namhyung Kim <>
tools/perf/builtin-inject.c | 12 ------------
1 file changed, 12 deletions(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 500428aaa576..0191d72be7c4 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -277,8 +277,6 @@ static int perf_event__repipe_sample(struct perf_tool *tool,
return f(tool, event, sample, evsel, machine);

- build_id__mark_dso_hit(tool, event, sample, evsel, machine);
if (inject->itrace_synth_opts.set && sample->aux_sample.size)
event = perf_inject__cut_auxtrace_sample(inject, event, sample);

@@ -767,16 +765,6 @@ static int __cmd_inject(struct perf_inject *inject)
return ret;

if (!data_out->is_pipe) {
- if (inject->build_ids)
- perf_header__set_feat(&session->header,
- /*
- * Keep all buildids when there is unprocessed AUX data because
- * it is not known which ones the AUX trace hits.
- */
- if (perf_header__has_feat(&session->header, HEADER_BUILD_ID) &&
- inject->have_auxtrace && !inject->itrace_synth_opts.set)
- dsos__hit_all(session);
* The AUX areas have been removed and replaced with
* synthesized hardware events, so clear the feature flag and
 \ /
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