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c90fba60f2
A number of functions in the resctrl selftests return errno. It is problematic because errno is positive which is often counterintuitive. Also, every site returning errno prints the error message already with ksft_perror() so there is not much added value in returning the precise error code. Simply convert all places returning errno to return -1 that is typical userspace error code in case of failures. While at it, improve resctrl_val() comment to state that 0 means the test was run (either pass or fail). Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
// 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 <sai.praneeth.prakhya@intel.com>,
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* Fenghua Yu <fenghua.yu@intel.com>
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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_PERCENT 8
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#define NUM_OF_RUNS 5
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static int
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show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, size_t 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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int runs, ret, avg_diff_per;
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float avg_diff = 0;
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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 = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
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avg_diff_per = (int)(avg_diff * 100);
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ret = avg_diff_per > MAX_DIFF_PERCENT;
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ksft_print_msg("%s Check MBM diff within %d%%\n",
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ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
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ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
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ksft_print_msg("Span (MB): %zu\n", span / MB);
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ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
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ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
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return ret;
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}
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static int check_results(size_t 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, ret;
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FILE *fp;
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ksft_print_msg("Checking for pass/fail\n");
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fp = fopen(output, "r");
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if (!fp) {
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ksft_perror(output);
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return -1;
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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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ret = show_bw_info(bw_imc, bw_resc, span);
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fclose(fp);
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return ret;
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}
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static int mbm_setup(struct resctrl_val_param *p)
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{
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int ret = 0;
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/* Run NUM_OF_RUNS times */
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if (p->num_of_runs >= NUM_OF_RUNS)
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return END_OF_TESTS;
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/* Set up shemata with 100% allocation on the first run. */
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if (p->num_of_runs == 0 && validate_resctrl_feature_request("MB", NULL))
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ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
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p->resctrl_val);
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p->num_of_runs++;
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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 cpu_no, const char * const *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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.cpu_no = cpu_no,
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.filename = RESULT_FILE_NAME,
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.bw_report = "reads",
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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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ret = resctrl_val(benchmark_cmd, ¶m);
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if (ret)
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goto out;
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ret = check_results(DEFAULT_SPAN);
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out:
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mbm_test_cleanup();
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return ret;
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}
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