This is a note to let you know that I've just added the patch titled perf intel-pt: Fix estimated timestamps for cycle-accurate mode to the 4.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: perf-intel-pt-fix-estimated-timestamps-for-cycle-accurate-mode.patch and it can be found in the queue-4.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 51ee6481fa8e879cc942bcc1b0af713e158b7a98 Mon Sep 17 00:00:00 2001 From: Adrian Hunter <adrian.hunter@xxxxxxxxx> Date: Wed, 28 Sep 2016 14:41:35 +0300 Subject: perf intel-pt: Fix estimated timestamps for cycle-accurate mode From: Adrian Hunter <adrian.hunter@xxxxxxxxx> 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@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Link: http://lkml.kernel.org/r/1475062896-22274-1-git-send-email-adrian.hunter@xxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++ 1 file changed, 2 insertions(+) --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -1323,6 +1323,8 @@ static void intel_pt_calc_cyc_timestamp( timestamp, decoder->timestamp); else decoder->timestamp = timestamp; + + decoder->timestamp_insn_cnt = 0; } /* Walk PSB+ packets when already in sync. */ Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are queue-4.8/mmc-sdhci-cast-unsigned-int-to-unsigned-long-long-to-avoid-unexpeted-error.patch queue-4.8/perf-intel-pt-fix-estimated-timestamps-for-cycle-accurate-mode.patch queue-4.8/perf-intel-pt-fix-mtc-timestamp-calculation-for-large-mtc-periods.patch queue-4.8/perf-intel-pt-fix-snapshot-overlap-detection-decoder-errors.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html