diff options
Diffstat (limited to 'tools/testing/selftests/resctrl/mba_test.c')
| -rw-r--r-- | tools/testing/selftests/resctrl/mba_test.c | 223 |
1 files changed, 223 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 000000000000..c7e9adc0368f --- /dev/null +++ b/tools/testing/selftests/resctrl/mba_test.c @@ -0,0 +1,223 @@ +// 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 + +static int mba_init(const struct resctrl_val_param *param, int domain_id) +{ + int ret; + + ret = initialize_read_mem_bw_imc(); + if (ret) + return ret; + + initialize_mem_bw_resctrl(param, domain_id); + + return 0; +} + +/* + * 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(const struct resctrl_test *test, + const struct user_params *uparams, + struct resctrl_val_param *p) +{ + static unsigned int allocation = ALLOCATION_MIN; + static int runs_per_allocation; + 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_MAX) + return END_OF_TESTS; + + sprintf(allocation_str, "%d", allocation); + + ret = write_schemata(p->ctrlgrp, allocation_str, uparams->cpu, test->resource); + if (ret < 0) + return ret; + + allocation += ALLOCATION_STEP; + + return 0; +} + +static int mba_measure(const struct user_params *uparams, + struct resctrl_val_param *param, pid_t bm_pid) +{ + return measure_read_mem_bw(uparams, param, bm_pid); +} + +static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc) +{ + unsigned int allocation; + bool ret = false; + int runs; + + 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 sum_bw_imc = 0, sum_bw_resc = 0; + long avg_bw_imc, avg_bw_resc; + int avg_diff_per; + float avg_diff; + + for (runs = NUM_OF_RUNS * allocation; + 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; + avg_bw_resc = sum_bw_resc / NUM_OF_RUNS; + if (avg_bw_imc < THROTTLE_THRESHOLD || avg_bw_resc < THROTTLE_THRESHOLD) { + ksft_print_msg("Bandwidth below threshold (%d MiB). Dropping results from MBA schemata %u.\n", + THROTTLE_THRESHOLD, + ALLOCATION_MIN + ALLOCATION_STEP * allocation); + continue; + } + + 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_MIN + 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) +{ + unsigned long bw_resc[NUM_OF_RUNS * ALLOCATION_MAX / ALLOCATION_STEP]; + unsigned long bw_imc[NUM_OF_RUNS * ALLOCATION_MAX / ALLOCATION_STEP]; + char *token_array[8], output[] = RESULT_FILE_NAME, temp[512]; + int runs; + FILE *fp; + + fp = fopen(output, "r"); + if (!fp) { + ksft_perror(output); + + return -1; + } + + 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); +} + +static void mba_test_cleanup(void) +{ + remove(RESULT_FILE_NAME); +} + +static int mba_run_test(const struct resctrl_test *test, const struct user_params *uparams) +{ + struct resctrl_val_param param = { + .ctrlgrp = "c1", + .filename = RESULT_FILE_NAME, + .init = mba_init, + .setup = mba_setup, + .measure = mba_measure, + }; + struct fill_buf_param fill_buf = {}; + int ret; + + remove(RESULT_FILE_NAME); + + if (uparams->fill_buf) { + fill_buf.buf_size = uparams->fill_buf->buf_size; + fill_buf.memflush = uparams->fill_buf->memflush; + param.fill_buf = &fill_buf; + } else if (!uparams->benchmark_cmd[0]) { + ssize_t buf_size; + + buf_size = get_fill_buf_size(uparams->cpu, "L3"); + if (buf_size < 0) + return buf_size; + fill_buf.buf_size = buf_size; + fill_buf.memflush = true; + param.fill_buf = &fill_buf; + } + + ret = resctrl_val(test, uparams, ¶m); + if (ret) + return ret; + + ret = check_results(); + if (ret && (get_vendor() == ARCH_INTEL) && !snc_kernel_support()) + ksft_print_msg("Kernel doesn't support Sub-NUMA Clustering but it is enabled on the system.\n"); + + return ret; +} + +static bool mba_feature_check(const struct resctrl_test *test) +{ + return test_resource_feature_check(test) && + resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes"); +} + +struct resctrl_test mba_test = { + .name = "MBA", + .resource = "MB", + .vendor_specific = ARCH_INTEL, + .feature_check = mba_feature_check, + .run_test = mba_run_test, + .cleanup = mba_test_cleanup, +}; |