From: James Clark <james.clark@linaro.org>
Date: Tue, 9 Jun 2026 14:40:23 +0000 (+0100)
Subject: perf test cs-etm: Speed up disassembly test
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=0e16b544165822cd1452d446308fa3ec9311d05e;p=thirdparty%2Fkernel%2Flinux.git

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>
---

diff --git a/tools/perf/tests/shell/test_arm_coresight_disasm.sh b/tools/perf/tests/shell/test_arm_coresight_disasm.sh
index f78dfb6bf73e3..f2fb1aa92252a 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"