This is a note to let you know that I've just added the patch titled
perf intel-pt: Fix CYC timestamps after standalone CBR
to the 4.19-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-cyc-timestamps-after-standalone-cbr.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 430635a0ef1ce958b7b4311f172694ece2c692b8 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Mon, 3 Apr 2023 18:48:31 +0300
Subject: perf intel-pt: Fix CYC timestamps after standalone CBR
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit 430635a0ef1ce958b7b4311f172694ece2c692b8 upstream.
After a standalone CBR (not associated with TSC), update the cycles
reference timestamp and reset the cycle count, so that CYC timestamps
are calculated relative to that point with the new frequency.
Fixes: cc33618619cefc6d ("perf tools: Add Intel PT support for decoding CYC packets")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230403154831.8651-2-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
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
@@ -1499,6 +1499,8 @@ static void intel_pt_calc_cbr(struct int
decoder->cbr = cbr;
decoder->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;
+ decoder->cyc_ref_timestamp = decoder->timestamp;
+ decoder->cycle_cnt = 0;
}
static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-4.19/perf-dwarf-aux-fix-off-by-one-in-die_get_varname.patch
queue-4.19/perf-intel-pt-fix-cyc-timestamps-after-standalone-cbr.patch
