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selftests/resctrl: Add MBA test

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MBA (Memory Bandwidth Allocation) test starts a stressful memory
bandwidth benchmark and allocates memory bandwidth from 100% down
to 10% for the benchmark process. For each allocation, compare
perf IMC counter and mbm total bytes from resctrl. The difference
between the two values should be within a threshold to pass the test.

Default benchmark is built-in fill_buf. But users can specify their
own benchmark by option "-b".

We can add memory bandwidth allocation for multiple processes in the
future.

Co-developed-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Co-developed-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Fenghua Yu
2020-01-16 13:32:40 -08:00
committed by Shuah Khan
parent ecdbb911f2
commit 01fee6b4d1
3 changed files with 188 additions and 1 deletions
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16
tools/testing/selftests/resctrl/resctrl_tests.c
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@@ -26,6 +26,7 @@ static void cmd_help(void)
void tests_cleanup(void)
{
mbm_test_cleanup();
mba_test_cleanup();
}
int main(int argc, char **argv)
@@ -33,7 +34,7 @@ int main(int argc, char **argv)
int res, c, cpu_no = 1, span = 250, argc_new = argc, i, ben_ind;
char *benchmark_cmd[BENCHMARK_ARGS], bw_report[64], bm_type[64];
char benchmark_cmd_area[BENCHMARK_ARGS][BENCHMARK_ARG_SIZE];
bool has_ben = false, mbm_test = true;
bool has_ben = false, mbm_test = true, mba_test = true;
int ben_count;
for (i = 0; i < argc; i++) {
@@ -54,9 +55,12 @@ int main(int argc, char **argv)
token = strtok(optarg, ",");
mbm_test = false;
mba_test = false;
while (token) {
if (!strcmp(token, "mbm")) {
mbm_test = true;
} else if (!strcmp(token, "mba")) {
mba_test = true;
} else {
printf("invalid argument\n");
@@ -126,6 +130,16 @@ int main(int argc, char **argv)
tests_run++;
}
if (mba_test) {
printf("# Starting MBA Schemata change ...\n");
if (!has_ben)
sprintf(benchmark_cmd[1], "%d", span);
res = mba_schemata_change(cpu_no, bw_report, benchmark_cmd);
printf("%sok MBA: schemata change\n", res ? "not " : "");
mba_test_cleanup();
tests_run++;
}
printf("1..%d\n", tests_run);
return 0;