Commit d0456593 authored Sep 28, 2016 by Adrian Hunter Committed by Greg Kroah-Hartman Oct 28, 2016

perf intel-pt: Fix estimated timestamps for cycle-accurate mode



commit 51ee6481fa8e879cc942bcc1b0af713e158b7a98 upstream.

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>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 0ea2bdfc

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

+2 −0

Original line number	Diff line number	Diff line
		@@ -1323,6 +1323,8 @@ 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. */