154 lines
3.5 KiB
C
154 lines
3.5 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(const struct resctrl_test *test,
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const struct user_params *uparams,
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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 && resctrl_resource_exists("MB"))
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ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource);
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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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static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams)
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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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.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(test, uparams, uparams->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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if (ret && (get_vendor() == ARCH_INTEL))
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ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
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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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static bool mbm_feature_check(const struct resctrl_test *test)
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{
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return resctrl_mon_feature_exists("L3_MON", "mbm_total_bytes") &&
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resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes");
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}
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struct resctrl_test mbm_test = {
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.name = "MBM",
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.resource = "MB",
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.vendor_specific = ARCH_INTEL,
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.feature_check = mbm_feature_check,
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.run_test = mbm_run_test,
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};
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