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perf intel-pt: Support Z itrace option for timeless decoding
Correlating virtual machine TSC packets is not supported at present, so instead support the Z itrace option. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: https://lore.kernel.org/r/20210430070309.17624-4-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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2 changed files with 6 additions and 1 deletions
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@ -869,6 +869,7 @@ The letters are:
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L synthesize last branch entries on existing event records
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s skip initial number of events
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q quicker (less detailed) decoding
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Z prefer to ignore timestamps (so-called "timeless" decoding)
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"Instructions" events look like they were recorded by "perf record -e
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instructions".
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@ -1062,6 +1063,10 @@ What *will* be decoded with the qq option:
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- instruction pointer associated with PSB packets
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The Z option is equivalent to having recorded a trace without TSC
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(i.e. config term tsc=0). It can be useful to avoid timestamp issues when
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decoding a trace of a virtual machine.
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dump option
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~~~~~~~~~~~
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@ -899,7 +899,7 @@ static bool intel_pt_timeless_decoding(struct intel_pt *pt)
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bool timeless_decoding = true;
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u64 config;
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if (!pt->tsc_bit || !pt->cap_user_time_zero)
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if (!pt->tsc_bit || !pt->cap_user_time_zero || pt->synth_opts.timeless_decoding)
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return true;
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evlist__for_each_entry(pt->session->evlist, evsel) {
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