forked from luck/tmp_suning_uos_patched
perf intel-pt: Decoder to output CBR changes immediately
The core-to-bus ratio (CBR) provides the CPU frequency. With branches enabled, the decoder was outputting CBR changes only when there was a branch. That loses the correct time of the change if the trace is not in context (e.g. not tracing kernel space). Change to output the CBR change immediately. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/20190622093248.581-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -2015,16 +2015,8 @@ static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
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case INTEL_PT_CBR:
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intel_pt_calc_cbr(decoder);
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if (!decoder->branch_enable &&
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decoder->cbr != decoder->cbr_seen) {
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decoder->cbr_seen = decoder->cbr;
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decoder->state.type = INTEL_PT_CBR_CHG;
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decoder->state.from_ip = decoder->ip;
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decoder->state.to_ip = 0;
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decoder->state.cbr_payload =
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decoder->packet.payload;
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if (decoder->cbr != decoder->cbr_seen)
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return 0;
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}
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break;
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case INTEL_PT_MODE_EXEC:
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@ -2626,8 +2618,12 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
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decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
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} else {
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decoder->state.err = 0;
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if (decoder->cbr != decoder->cbr_seen && decoder->state.type) {
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if (decoder->cbr != decoder->cbr_seen) {
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decoder->cbr_seen = decoder->cbr;
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if (!decoder->state.type) {
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decoder->state.from_ip = decoder->ip;
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decoder->state.to_ip = 0;
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}
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decoder->state.type |= INTEL_PT_CBR_CHG;
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decoder->state.cbr_payload = decoder->cbr_payload;
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}
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