Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH 1/3] perf intel-pt: Fix recording PEBS-via-PT with registers | Date | Tue, 30 Jun 2020 16:39:33 +0300 |
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When recording PEBS-via-PT, the kernel will not accept the intel_pt event with register sampling e.g.
# perf record --kcore -c 10000 -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -I -- ls -l Error: intel_pt/branch=0/: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
Fix by suppressing register sampling on the intel_pt evsel.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Fixes: 9e64cefe4335b ("perf intel-pt: Process options for PEBS event synthesis") --- tools/perf/arch/x86/util/intel-pt.c | 1 + tools/perf/util/evsel.c | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c index 839ef52c1ac2..6ce451293634 100644 --- a/tools/perf/arch/x86/util/intel-pt.c +++ b/tools/perf/arch/x86/util/intel-pt.c @@ -641,6 +641,7 @@ static int intel_pt_recording_options(struct auxtrace_record *itr, } evsel->core.attr.freq = 0; evsel->core.attr.sample_period = 1; + evsel->no_aux_samples = true; intel_pt_evsel = evsel; opts->full_auxtrace = true; } diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index a68ac3632ae6..ef802f6d40c1 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1014,12 +1014,12 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts, if (callchain && callchain->enabled && !evsel->no_aux_samples) evsel__config_callchain(evsel, opts, callchain); - if (opts->sample_intr_regs) { + if (opts->sample_intr_regs && !evsel->no_aux_samples) { attr->sample_regs_intr = opts->sample_intr_regs; evsel__set_sample_bit(evsel, REGS_INTR); } - if (opts->sample_user_regs) { + if (opts->sample_user_regs && !evsel->no_aux_samples) { attr->sample_regs_user |= opts->sample_user_regs; evsel__set_sample_bit(evsel, REGS_USER); } -- 2.17.1
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