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Diffstat (limited to '')
| -rw-r--r-- | tools/testing/selftests/resctrl/mbm_test.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c new file mode 100644 index 000000000000..8392e5c55ed0 --- /dev/null +++ b/tools/testing/selftests/resctrl/mbm_test.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Memory Bandwidth Monitoring (MBM) 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_mbm" +#define MAX_DIFF_PERCENT 5 +#define NUM_OF_RUNS 5 + +static int +show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span) +{ + unsigned long avg_bw_imc = 0, avg_bw_resc = 0; + unsigned long sum_bw_imc = 0, sum_bw_resc = 0; + int runs, ret, avg_diff_per; + float avg_diff = 0; + + /* + * Discard the first value which is inaccurate due to monitoring setup + * transition phase. + */ + for (runs = 1; runs < NUM_OF_RUNS ; runs++) { + sum_bw_imc += bw_imc[runs]; + sum_bw_resc += bw_resc[runs]; + } + + avg_bw_imc = sum_bw_imc / 4; + avg_bw_resc = sum_bw_resc / 4; + avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc; + avg_diff_per = (int)(avg_diff * 100); + + ret = avg_diff_per > MAX_DIFF_PERCENT; + ksft_print_msg("%s Check MBM diff within %d%%\n", + ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT); + ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per); + ksft_print_msg("Span (MB): %d\n", span); + ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc); + ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc); + + return ret; +} + +static int check_results(int span) +{ + unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS]; + char temp[1024], *token_array[8]; + char output[] = RESULT_FILE_NAME; + int runs, ret; + FILE *fp; + + ksft_print_msg("Checking for pass/fail\n"); + + fp = fopen(output, "r"); + if (!fp) { + perror(output); + + return errno; + } + + runs = 0; + while (fgets(temp, sizeof(temp), fp)) { + char *token = strtok(temp, ":\t"); + int i = 0; + + while (token) { + token_array[i++] = token; + token = strtok(NULL, ":\t"); + } + + bw_resc[runs] = strtoul(token_array[5], NULL, 0); + bw_imc[runs] = strtoul(token_array[3], NULL, 0); + runs++; + } + + ret = show_bw_info(bw_imc, bw_resc, span); + + fclose(fp); + + return ret; +} + +static int mbm_setup(int num, ...) +{ + struct resctrl_val_param *p; + static int num_of_runs; + va_list param; + int ret = 0; + + /* Run NUM_OF_RUNS times */ + if (num_of_runs++ >= NUM_OF_RUNS) + return -1; + + va_start(param, num); + p = va_arg(param, struct resctrl_val_param *); + va_end(param); + + /* Set up shemata with 100% allocation on the first run. */ + if (num_of_runs == 0) + ret = write_schemata(p->ctrlgrp, "100", p->cpu_no, + p->resctrl_val); + + return ret; +} + +void mbm_test_cleanup(void) +{ + remove(RESULT_FILE_NAME); +} + +int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd) +{ + struct resctrl_val_param param = { + .resctrl_val = MBM_STR, + .ctrlgrp = "c1", + .mongrp = "m1", + .span = span, + .cpu_no = cpu_no, + .mum_resctrlfs = 1, + .filename = RESULT_FILE_NAME, + .bw_report = bw_report, + .setup = mbm_setup + }; + int ret; + + remove(RESULT_FILE_NAME); + + ret = resctrl_val(benchmark_cmd, ¶m); + if (ret) + return ret; + + ret = check_results(span); + if (ret) + return ret; + + mbm_test_cleanup(); + + return 0; +} |