diff mbox series

[2/2] perf intel-pt: Fix CYC timestamps after standalone CBR

Message ID 20230403154831.8651-3-adrian.hunter@intel.com
State New
Headers
Series perf intel-pt: Two small fixes for stable |

Commit Message

Adrian Hunter April 3, 2023, 3:48 p.m. UTC 
  After a standalone CBR (not associated with TSC), update the cycles
reference timestamp and reset the cycle count, so that CYC timestamps are
calculated relative to that point with the new frequency.

Fixes: cc33618619ce ("perf tools: Add Intel PT support for decoding CYC packets")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

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 0ac860c8dd2b..7145c5890de0 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1998,6 +1998,8 @@  static void intel_pt_calc_cbr(struct intel_pt_decoder *decoder)
 
 	decoder->cbr = cbr;
 	decoder->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;
+	decoder->cyc_ref_timestamp = decoder->timestamp;
+	decoder->cycle_cnt = 0;
 
 	intel_pt_mtc_cyc_cnt_cbr(decoder);
 }