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authorAdrian Hunter <adrian.hunter@intel.com>2016-09-28 14:41:35 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-10-05 08:15:29 -0300
commit51ee6481fa8e879cc942bcc1b0af713e158b7a98 (patch)
treebc805159faeca437d6b179d48614c0ad5663fb22
parenta1d9972e59e15538458c030affbfc298c32a47f8 (diff)
perf intel-pt: Fix estimated timestamps for cycle-accurate mode
In cycle-accurate mode, timestamps can be calculated from CYC packets. The decoder also estimates timestamps based on the number of instructions since the last timestamp. For that to work in cycle-accurate mode, the instruction count needs to be reset to zero when a timestamp is calculated from a CYC packet, but that wasn't happening, so fix it. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: stable@vger.kernel.org # v4.3+ Link: http://lkml.kernel.org/r/1475062896-22274-1-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/intel-pt-decoder/intel-pt-decoder.c2
1 files changed, 2 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 7591a0c37473..3d1d446f037f 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1353,6 +1353,8 @@ static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
timestamp, decoder->timestamp);
else
decoder->timestamp = timestamp;
+
+ decoder->timestamp_insn_cnt = 0;
}
/* Walk PSB+ packets when already in sync. */