Messages in this thread Patch in this message | | | Date | Wed, 3 Apr 2019 20:10:47 +0200 | From | Jiri Olsa <> | Subject | Re: [BUG] perf: intel_pt won't display kernel function |
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On Wed, Apr 03, 2019 at 05:05:02PM +0000, Song Liu wrote: > > > > 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
yes, I think it's the --kallsyms otion which is added by perf-with-kcore that's broken
jirka
> > 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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