Patch "perf intel-pt: Fix estimated timestamps for cycle-accurate mode" has been added to the 4.8-stable tree

Patch "perf intel-pt: Fix estimated timestamps for cycle-accurate mode" has been added to the 4.8-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From 51ee6481fa8e879cc942bcc1b0af713e158b7a98 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
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@intel.com>

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>

---
 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@intel.com 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