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authorAdrian Hunter <adrian.hunter@intel.com>2018-03-07 17:02:24 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-20 09:20:41 +0300
commit57ce7d4b43db2ec16807a50a12b4724f60c6a641 (patch)
treeb96ba2ec82f25018d0905eb4782aa8ea41e23e21 /tools
parent2c1f44bdf8e088c693189edf4233ad8eb09faa65 (diff)
downloadlinux-57ce7d4b43db2ec16807a50a12b4724f60c6a641.tar.xz
perf intel-pt: Fix timestamp following overflow
commit 91d29b288aed3406caf7c454bf2b898c96cfd177 upstream. timestamp_insn_cnt is used to estimate the timestamp based on the number of instructions since the last known timestamp. If the estimate is not accurate enough decoding might not be correctly synchronized with side-band events causing more trace errors. However there are always timestamps following an overflow, so the estimate is not needed and can indeed result in more errors. Suppress the estimate by setting timestamp_insn_cnt to zero. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1520431349-30689-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/intel-pt-decoder/intel-pt-decoder.c1
1 files changed, 1 insertions, 0 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 1d0ea0c78d0c..cac39532c057 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1300,6 +1300,7 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
intel_pt_clear_tx_flags(decoder);
decoder->have_tma = false;
decoder->cbr = 0;
+ decoder->timestamp_insn_cnt = 0;
decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
decoder->overflow = true;
return -EOVERFLOW;