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-rw-r--r--tools/testing/selftests/resctrl/mba_test.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
new file mode 100644
index 000000000..6cfddd1d4
--- /dev/null
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Memory Bandwidth Allocation (MBA) test
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Authors:
+ * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
+ * Fenghua Yu <fenghua.yu@intel.com>
+ */
+#include "resctrl.h"
+
+#define RESULT_FILE_NAME "result_mba"
+#define NUM_OF_RUNS 5
+#define MAX_DIFF 300
+#define ALLOCATION_MAX 100
+#define ALLOCATION_MIN 10
+#define ALLOCATION_STEP 10
+
+/*
+ * Change schemata percentage from 100 to 10%. Write schemata to specified
+ * con_mon grp, mon_grp in resctrl FS.
+ * For each allocation, run 5 times in order to get average values.
+ */
+static int mba_setup(int num, ...)
+{
+ static int runs_per_allocation, allocation = 100;
+ struct resctrl_val_param *p;
+ char allocation_str[64];
+ va_list param;
+ int ret;
+
+ va_start(param, num);
+ p = va_arg(param, struct resctrl_val_param *);
+ va_end(param);
+
+ if (runs_per_allocation >= NUM_OF_RUNS)
+ runs_per_allocation = 0;
+
+ /* Only set up schemata once every NUM_OF_RUNS of allocations */
+ if (runs_per_allocation++ != 0)
+ return 0;
+
+ if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX)
+ return -1;
+
+ sprintf(allocation_str, "%d", allocation);
+
+ ret = write_schemata(p->ctrlgrp, allocation_str, p->cpu_no,
+ p->resctrl_val);
+ if (ret < 0)
+ return ret;
+
+ allocation -= ALLOCATION_STEP;
+
+ return 0;
+}
+
+static void show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
+{
+ int allocation, runs;
+ bool failed = false;
+
+ printf("# Results are displayed in (MB)\n");
+ /* Memory bandwidth from 100% down to 10% */
+ for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP;
+ allocation++) {
+ unsigned long avg_bw_imc, avg_bw_resc;
+ unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
+ unsigned long avg_diff;
+
+ /*
+ * The first run is discarded due to inaccurate value from
+ * phase transition.
+ */
+ for (runs = NUM_OF_RUNS * allocation + 1;
+ runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) {
+ sum_bw_imc += bw_imc[runs];
+ sum_bw_resc += bw_resc[runs];
+ }
+
+ avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
+ avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
+ avg_diff = labs((long)(avg_bw_resc - avg_bw_imc));
+
+ printf("%sok MBA schemata percentage %u smaller than %d %%\n",
+ avg_diff > MAX_DIFF ? "not " : "",
+ ALLOCATION_MAX - ALLOCATION_STEP * allocation,
+ MAX_DIFF);
+ tests_run++;
+ printf("# avg_diff: %lu\n", avg_diff);
+ printf("# avg_bw_imc: %lu\n", avg_bw_imc);
+ printf("# avg_bw_resc: %lu\n", avg_bw_resc);
+ if (avg_diff > MAX_DIFF)
+ failed = true;
+ }
+
+ printf("%sok schemata change using MBA%s\n", failed ? "not " : "",
+ failed ? " # at least one test failed" : "");
+ tests_run++;
+}
+
+static int check_results(void)
+{
+ char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
+ unsigned long bw_imc[1024], bw_resc[1024];
+ int runs;
+ FILE *fp;
+
+ fp = fopen(output, "r");
+ if (!fp) {
+ perror(output);
+
+ return errno;
+ }
+
+ runs = 0;
+ while (fgets(temp, sizeof(temp), fp)) {
+ char *token = strtok(temp, ":\t");
+ int fields = 0;
+
+ while (token) {
+ token_array[fields++] = token;
+ token = strtok(NULL, ":\t");
+ }
+
+ /* Field 3 is perf imc value */
+ bw_imc[runs] = strtoul(token_array[3], NULL, 0);
+ /* Field 5 is resctrl value */
+ bw_resc[runs] = strtoul(token_array[5], NULL, 0);
+ runs++;
+ }
+
+ fclose(fp);
+
+ show_mba_info(bw_imc, bw_resc);
+
+ return 0;
+}
+
+void mba_test_cleanup(void)
+{
+ remove(RESULT_FILE_NAME);
+}
+
+int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)
+{
+ struct resctrl_val_param param = {
+ .resctrl_val = MBA_STR,
+ .ctrlgrp = "c1",
+ .mongrp = "m1",
+ .cpu_no = cpu_no,
+ .mum_resctrlfs = 1,
+ .filename = RESULT_FILE_NAME,
+ .bw_report = bw_report,
+ .setup = mba_setup
+ };
+ int ret;
+
+ remove(RESULT_FILE_NAME);
+
+ if (!validate_resctrl_feature_request("mba"))
+ return -1;
+
+ ret = resctrl_val(benchmark_cmd, &param);
+ if (ret)
+ return ret;
+
+ ret = check_results();
+ if (ret)
+ return ret;
+
+ mba_test_cleanup();
+
+ return 0;
+}