AMD CPUs in particular implement fewer monitors than RMIDs, so add a test case to see if a large number of monitoring groups can be measured together.
Signed-off-by: Peter Newman peternewman@google.com --- tools/testing/selftests/resctrl/test_rmids.sh | 93 +++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100755 tools/testing/selftests/resctrl/test_rmids.sh
diff --git a/tools/testing/selftests/resctrl/test_rmids.sh b/tools/testing/selftests/resctrl/test_rmids.sh new file mode 100755 index 000000000000..475e69c0217e --- /dev/null +++ b/tools/testing/selftests/resctrl/test_rmids.sh @@ -0,0 +1,93 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +cd /sys/fs/resctrl + +grep -q mbm_total_bytes info/L3_MON/mon_features || { + echo "MBM required" + exit 4 +} + +which perf > /dev/null || { + echo "perf tool required" + exit 4 +} + +num_rmids=$(cat info/L3_MON/num_rmids) + +count=0 + +result=0 + +# use as many RMIDs as possible, up to the number of RMIDs +for i in `seq $num_rmids`; do + mkdir mon_groups/_test_m$((count+1)) 2> /dev/null || break + if [[ -d mon_groups/_test_m$((count+1))/mon_data ]]; then + count=$((count+1)) + else + break; + fi +done + +echo "Created $count monitoring groups." + +if [[ $count -eq 0 ]]; then + echo "need monitoring groups to continue." + exit 4 +fi + +declare -a bytes_array + +unavailable=0 +unavailable0=0 + +for i in `seq $count`; do + bytes_array[$i]=$(cat mon_groups/_test_m${i}/mon_data/mon_L3_00/mbm_total_bytes) + + if [[ "${bytes_array[$i]}" = "Unavailable" ]]; then + unavailable0=$((unavailable0 + 1)) + fi +done + +for i in `seq $count`; do + echo $$ > mon_groups/_test_m${i}/tasks + taskset 0x1 perf bench mem memcpy -s 100MB -f default > /dev/null +done +echo $$ > tasks + +# zero non-integer values +declare -i bytes bytes0 + +success_count=0 + +for i in `seq $count`; do + raw_bytes=$(cat mon_groups/_test_m${i}/mon_data/mon_L3_00/mbm_total_bytes) + raw_bytes0=${bytes_array[$i]} + + # coerce the value to an integer for math + bytes=$raw_bytes + bytes0=$raw_bytes0 + + echo -n "g${i}: mbm_total_bytes: $raw_bytes0 -> $raw_bytes" + + if [[ "$raw_bytes" = "Unavailable" ]]; then + unavailable=$((unavailable + 1)) + fi + + if [[ $bytes -gt $bytes0 ]]; then + success_count=$((success_count+1)) + echo "" + else + echo " (FAIL)" + result=1 + fi +done + +first=$((count-unavailable0)) +second=$((count-unavailable)) +echo "$count groups, $first returned counts in first pass, $second in second" +echo "successfully measured bandwidth from ${success_count}/${count} groups" + +rmdir mon_groups/_test_m* + +exit $result