From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiri Olsa Subject: [BUG] perf: intel_pt won't display kernel function Date: Wed, 3 Apr 2019 16:37:38 +0200 Message-ID: <20190403143738.GB32001@krava> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: Adrian Hunter Cc: Andi Kleen , acme@kernel.org, jolsa@kernel.org, namhyung@kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Andi Kleen , Song Liu List-Id: linux-perf-users.vger.kernel.org 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 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,