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    Subject[PATCH 1/2] perf intel-pt: Fix estimated timestamps for cycle-accurate mode
    Date
    In cycle-accurate mode, timestamps can be calculated from CYC packets. The
    decoder also estimates timestamps based on the number of instructions since
    the last timestamp. For that to work in cycle-accurate mode, the
    instruction count needs to be reset to zero when a timestamp is calculated
    from a CYC packet, but that wasn't happening, so fix it.

    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    Cc: stable@vger.kernel.org # v4.3+
    ---
    tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
    index 7591a0c37473..3d1d446f037f 100644
    --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
    +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
    @@ -1353,6 +1353,8 @@ static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
    timestamp, decoder->timestamp);
    else
    decoder->timestamp = timestamp;
    +
    + decoder->timestamp_insn_cnt = 0;
    }

    /* Walk PSB+ packets when already in sync. */
    --
    1.9.1
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