This is a note to let you know that I've just added the patch titled
perf test: Add test for Intel TPEBS counting mode
to the 6.11-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-test-add-test-for-intel-tpebs-counting-mode.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 03bd5adf22c2f1283a361fe95bea4616a83b024c
Author: Weilin Wang <weilin.wang@xxxxxxxxx>
Date: Sat Jul 20 02:21:01 2024 -0400
perf test: Add test for Intel TPEBS counting mode
[ Upstream commit b2738fda24543777a623a7d1cc2a9985ab81b448 ]
Intel TPEBS sampling mode is supported through perf record. The counting mode
code uses perf record to capture retire_latency value and use it in metric
calculation. This test checks the counting mode code on Intel platforms.
Committer testing:
root@x1:~# perf test tpebs
123: test Intel TPEBS counting mode : Ok
root@x1:~# set -o vi
root@x1:~# perf test tpebs
123: test Intel TPEBS counting mode : Ok
root@x1:~# perf test -v tpebs
123: test Intel TPEBS counting mode : Ok
root@x1:~# perf test -vvv tpebs
123: test Intel TPEBS counting mode:
--- start ---
test child forked, pid 16603
Testing without --record-tpebs
Testing with --record-tpebs
---- end(0) ----
123: test Intel TPEBS counting mode : Ok
root@x1:~#
Reviewed-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
Acked-by: Ian Rogers <irogers@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Caleb Biggers <caleb.biggers@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Perry Taylor <perry.taylor@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Samantha Alt <samantha.alt@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240720062102.444578-9-weilin.wang@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Stable-dep-of: 057f8bfc6f70 ("perf stat: Uniquify event name improvements")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/perf/tests/shell/test_stat_intel_tpebs.sh b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
new file mode 100755
index 0000000000000..c60b29add9801
--- /dev/null
+++ b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+# test Intel TPEBS counting mode
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+grep -q GenuineIntel /proc/cpuinfo || { echo Skipping non-Intel; exit 2; }
+
+# Use this event for testing because it should exist in all platforms
+event=cache-misses:R
+
+# Without this cmd option, default value or zero is returned
+echo "Testing without --record-tpebs"
+result=$(perf stat -e "$event" true 2>&1)
+[[ "$result" =~ $event ]] || exit 1
+
+# In platforms that do not support TPEBS, it should execute without error.
+echo "Testing with --record-tpebs"
+result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
+[[ "$result" =~ "perf record" && "$result" =~ $event ]] || exit 1
