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145 lines
2.9 KiB
145 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Memory Bandwidth Monitoring (MBM) test |
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* |
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* Copyright (C) 2018 Intel Corporation |
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* |
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* Authors: |
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* Sai Praneeth Prakhya <[email protected]>, |
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* Fenghua Yu <[email protected]> |
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*/ |
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#include "resctrl.h" |
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#define RESULT_FILE_NAME "result_mbm" |
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#define MAX_DIFF 300 |
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#define NUM_OF_RUNS 5 |
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static void |
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show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span) |
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{ |
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unsigned long avg_bw_imc = 0, avg_bw_resc = 0; |
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unsigned long sum_bw_imc = 0, sum_bw_resc = 0; |
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long avg_diff = 0; |
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int runs; |
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/* |
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* Discard the first value which is inaccurate due to monitoring setup |
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* transition phase. |
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*/ |
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for (runs = 1; runs < NUM_OF_RUNS ; runs++) { |
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sum_bw_imc += bw_imc[runs]; |
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sum_bw_resc += bw_resc[runs]; |
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} |
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avg_bw_imc = sum_bw_imc / 4; |
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avg_bw_resc = sum_bw_resc / 4; |
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avg_diff = avg_bw_resc - avg_bw_imc; |
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printf("%sok MBM: diff within %d%%\n", |
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labs(avg_diff) > MAX_DIFF ? "not " : "", MAX_DIFF); |
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tests_run++; |
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printf("# avg_diff: %lu\n", labs(avg_diff)); |
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printf("# Span (MB): %d\n", span); |
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printf("# avg_bw_imc: %lu\n", avg_bw_imc); |
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printf("# avg_bw_resc: %lu\n", avg_bw_resc); |
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} |
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static int check_results(int span) |
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{ |
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unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS]; |
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char temp[1024], *token_array[8]; |
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char output[] = RESULT_FILE_NAME; |
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int runs; |
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FILE *fp; |
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printf("# Checking for pass/fail\n"); |
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fp = fopen(output, "r"); |
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if (!fp) { |
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perror(output); |
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return errno; |
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} |
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runs = 0; |
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while (fgets(temp, sizeof(temp), fp)) { |
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char *token = strtok(temp, ":\t"); |
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int i = 0; |
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while (token) { |
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token_array[i++] = token; |
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token = strtok(NULL, ":\t"); |
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} |
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bw_resc[runs] = strtoul(token_array[5], NULL, 0); |
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bw_imc[runs] = strtoul(token_array[3], NULL, 0); |
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runs++; |
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} |
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show_bw_info(bw_imc, bw_resc, span); |
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fclose(fp); |
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return 0; |
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} |
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static int mbm_setup(int num, ...) |
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{ |
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struct resctrl_val_param *p; |
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static int num_of_runs; |
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va_list param; |
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int ret = 0; |
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/* Run NUM_OF_RUNS times */ |
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if (num_of_runs++ >= NUM_OF_RUNS) |
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return -1; |
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va_start(param, num); |
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p = va_arg(param, struct resctrl_val_param *); |
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va_end(param); |
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/* Set up shemata with 100% allocation on the first run. */ |
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if (num_of_runs == 0) |
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ret = write_schemata(p->ctrlgrp, "100", p->cpu_no, |
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p->resctrl_val); |
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return ret; |
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} |
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void mbm_test_cleanup(void) |
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{ |
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remove(RESULT_FILE_NAME); |
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} |
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int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd) |
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{ |
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struct resctrl_val_param param = { |
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.resctrl_val = MBM_STR, |
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.ctrlgrp = "c1", |
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.mongrp = "m1", |
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.span = span, |
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.cpu_no = cpu_no, |
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.mum_resctrlfs = 1, |
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.filename = RESULT_FILE_NAME, |
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.bw_report = bw_report, |
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.setup = mbm_setup |
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}; |
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int ret; |
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remove(RESULT_FILE_NAME); |
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if (!validate_resctrl_feature_request("mbm")) |
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return -1; |
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ret = resctrl_val(benchmark_cmd, ¶m); |
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if (ret) |
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return ret; |
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ret = check_results(span); |
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if (ret) |
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return ret; |
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mbm_test_cleanup(); |
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return 0; |
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}
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