From abe5a1d3e4bee361bd3b21b8909c8421e46911d1 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Sat, 22 Jun 2019 12:32:42 +0300 Subject: [PATCH] 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 Cc: Jiri Olsa Link: http://lkml.kernel.org/r/20190622093248.581-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- .../util/intel-pt-decoder/intel-pt-decoder.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) 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 f8b71bf2bb4c..3d2255f284f4 100644 --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -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; } -- GitLab