[PATCH v3 05/18] perf test: cs-etm: Increase window size in disassembly test

[James Clark]

When we increase the default timestamp interval in a later commit, less
trace will be recorded. At the moment the amount of trace overflows the
64K buffer, so the exit snapshot trace is what happened at the end of
the process rather than the beginning. With the new default interval,
the entire execution will be contained in one buffer and the first few
samples are always various instruction and data faults. These go to the
kernel so don't result in ranges that can be disassembled.

Increase the window to 6 samples to ensure something with a branch can
be disassembled even with the fault samples.

Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
---
 tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh b/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh
index d298b18154b2..236c4160e480 100755
--- a/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh
+++ b/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh
@@ -50,7 +50,7 @@ if [ "$(id -u)" == 0 ] && [ -e /proc/kcore ]; then
 	echo "Testing kernel disassembly"
 	perf record -o ${perfdata} -e cs_etm//k --kcore -Se -m,64K -- touch $file > /dev/null 2>&1
 	perf script -i ${perfdata} arm-cs-trace-disasm -- \
-		-d --stop-sample=2 -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file}
+		-d --stop-sample=6 -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file}
 	grep -q -E ${branch_search} ${file}
 	echo "Found kernel branches"
 else
@@ -62,7 +62,7 @@ fi
 echo "Testing userspace disassembly"
 perf record -o ${perfdata} -e cs_etm//u -Se -m,64K -- touch $file > /dev/null 2>&1
 perf script -i ${perfdata} arm-cs-trace-disasm -- \
-	-d --stop-sample=2 2> /dev/null > ${file}
+	-d --stop-sample=6 2> /dev/null > ${file}
 grep -q -E ${branch_search} ${file}
 echo "Found userspace branches"
 

-- 
2.43.0