perf intel-pt: Fix timestamp following overflow
authorAdrian Hunter <adrian.hunter@intel.com>
Wed, 7 Mar 2018 14:02:24 +0000 (16:02 +0200)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 8 Mar 2018 13:05:56 +0000 (10:05 -0300)
commit91d29b288aed3406caf7c454bf2b898c96cfd177
tree94ab1cedbe0955d3c619ee37ffdfe19cc9a6ea1e
parent1c196a6c771c47a2faa63d38d913e03284f73a16
perf intel-pt: Fix timestamp following overflow

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>
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c