diff options
Diffstat (limited to 'tools/testing/selftests/resctrl/mba_test.c')
-rw-r--r-- | tools/testing/selftests/resctrl/mba_test.c | 169 |
1 files changed, 169 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 0000000000..d3bf436834 --- /dev/null +++ b/tools/testing/selftests/resctrl/mba_test.c @@ -0,0 +1,169 @@ +// 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_PERCENT 8 +#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(struct resctrl_val_param *p) +{ + static int runs_per_allocation, allocation = 100; + char allocation_str[64]; + int ret; + + 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 END_OF_TESTS; + + 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 bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc) +{ + int allocation, runs; + bool ret = false; + + ksft_print_msg("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; + int avg_diff_per; + float 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 = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc; + avg_diff_per = (int)(avg_diff * 100); + + ksft_print_msg("%s Check MBA diff within %d%% for schemata %u\n", + avg_diff_per > MAX_DIFF_PERCENT ? + "Fail:" : "Pass:", + MAX_DIFF_PERCENT, + ALLOCATION_MAX - ALLOCATION_STEP * allocation); + + ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); + ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); + ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc); + if (avg_diff_per > MAX_DIFF_PERCENT) + ret = true; + } + + ksft_print_msg("%s Check schemata change using MBA\n", + ret ? "Fail:" : "Pass:"); + if (ret) + ksft_print_msg("At least one test failed\n"); + + return ret; +} + +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); + + return show_mba_info(bw_imc, bw_resc); +} + +void mba_test_cleanup(void) +{ + remove(RESULT_FILE_NAME); +} + +int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd) +{ + struct resctrl_val_param param = { + .resctrl_val = MBA_STR, + .ctrlgrp = "c1", + .mongrp = "m1", + .cpu_no = cpu_no, + .filename = RESULT_FILE_NAME, + .bw_report = "reads", + .setup = mba_setup + }; + int ret; + + remove(RESULT_FILE_NAME); + + ret = resctrl_val(benchmark_cmd, ¶m); + if (ret) + goto out; + + ret = check_results(); + +out: + mba_test_cleanup(); + + return ret; +} |