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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>
This commit is contained in:
Adrian Hunter 2019-06-22 12:32:42 +03:00 committed by Arnaldo Carvalho de Melo
parent 9f94c7f947
commit abe5a1d3e4
1 changed files with 6 additions and 10 deletions
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16
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
View File

@ -2015,16 +2015,8 @@ static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
case INTEL_PT_CBR:
intel_pt_calc_cbr(decoder);
if (!decoder->branch_enable &&
decoder->cbr != decoder->cbr_seen) {
decoder->cbr_seen = decoder->cbr;
decoder->state.type = INTEL_PT_CBR_CHG;
decoder->state.from_ip = decoder->ip;
decoder->state.to_ip = 0;
decoder->state.cbr_payload =
decoder->packet.payload;
if (decoder->cbr != decoder->cbr_seen)
return 0;
}
break;
case INTEL_PT_MODE_EXEC:
@ -2626,8 +2618,12 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
} else {
decoder->state.err = 0;
if (decoder->cbr != decoder->cbr_seen && decoder->state.type) {
if (decoder->cbr != decoder->cbr_seen) {
decoder->cbr_seen = decoder->cbr;
if (!decoder->state.type) {
decoder->state.from_ip = decoder->ip;
decoder->state.to_ip = 0;
}
decoder->state.type |= INTEL_PT_CBR_CHG;
decoder->state.cbr_payload = decoder->cbr_payload;
}