From 0e16b544165822cd1452d446308fa3ec9311d05e Mon Sep 17 00:00:00 2001
From: James Clark <james.clark@linaro.org>
Date: Tue, 9 Jun 2026 15:40:23 +0100
Subject: [PATCH] perf test cs-etm: Speed up disassembly test

We can use exit snapshot to limit the amount of trace to decode here
too. Also each call to objdump is quite expensive on kcore so limit it
to 2 samples instead of 30. We only want to see if there is no data at
all.

Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/tests/shell/test_arm_coresight_disasm.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/tests/shell/test_arm_coresight_disasm.sh b/tools/perf/tests/shell/test_arm_coresight_disasm.sh
index f78dfb6bf73e..f2fb1aa92252 100755
--- a/tools/perf/tests/shell/test_arm_coresight_disasm.sh
+++ b/tools/perf/tests/shell/test_arm_coresight_disasm.sh
@@ -43,9 +43,9 @@ branch_search='[[:space:]](bl|b(\.(eq|ne|cs|cc|mi|pl|vs|vc|hi|ls|ge|lt|gt|le|al)
 ## Test kernel ##
 if [ "$(id -u)" == 0 ] && [ -e /proc/kcore ]; then
 	echo "Testing kernel disassembly"
-	perf record -o ${perfdata} -e cs_etm//k --kcore -- touch $file > /dev/null 2>&1
+	perf record -o ${perfdata} -e cs_etm//k --kcore -Se -m,64K -- touch $file > /dev/null 2>&1
 	perf script -i ${perfdata} -s python:${script_path} -- \
-		-d --stop-sample=30 -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file}
+		-d --stop-sample=2 -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file}
 	grep -q -E ${branch_search} ${file}
 	echo "Found kernel branches"
 else
@@ -55,9 +55,9 @@ fi
 
 ## Test user ##
 echo "Testing userspace disassembly"
-perf record -o ${perfdata} -e cs_etm//u -- touch $file > /dev/null 2>&1
+perf record -o ${perfdata} -e cs_etm//u -Se -m,64K -- touch $file > /dev/null 2>&1
 perf script -i ${perfdata} -s python:${script_path} -- \
-	-d --stop-sample=30 2> /dev/null > ${file}
+	-d --stop-sample=2 2> /dev/null > ${file}
 grep -q -E ${branch_search} ${file}
 echo "Found userspace branches"