Messages in this thread Patch in this message | | | From | Song Liu <> | Subject | Re: [BUG] perf: intel_pt won't display kernel function | Date | Wed, 3 Apr 2019 17:05:02 +0000 |
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> On Apr 3, 2019, at 7:37 AM, Jiri Olsa <jolsa@redhat.com> wrote: > > hi, > perf script --call-trace stop working for me recently, > and displays only user space functions > > I bisected that to: > 7b612e291a5a perf tools: Synthesize PERF_RECORD_* for loaded BPF programs > > data from following comands will display user space functions only: > # perf-with-kcore record pt -e intel_pt// -- ls > # perf-with-kcore script pt --call-trace
Seems the following are ok (upstream as-is)?
./perf record -e intel_pt// -- ls ./perf script --call-trace
Jiri, could you please verify this? (Sorry I am new to perf-with-kcore).
Thanks, Song
> > when I disable the bpf synthesizing (patch below), kernel functions are back > > I guess the new events mess up with intel_pt decoder somehow > > > thanks, > jirka > > > --- > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c > index 4e2d953d4bc5..3daa78bc6549 100644 > --- a/tools/perf/builtin-record.c > +++ b/tools/perf/builtin-record.c > @@ -1114,10 +1114,12 @@ static int record__synthesize(struct record *rec, bool tail) > return err; > } > > +#if 0 > err = perf_event__synthesize_bpf_events(session, process_synthesized_event, > machine, opts); > if (err < 0) > pr_warning("Couldn't synthesize bpf events.\n"); > +#endif > > err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads, > process_synthesized_event, opts->sample_address,
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