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// 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_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 int runs_per_allocation, allocation = 100;
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_MIN || 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_mem_bw(uparams, param, bm_pid, "reads");
}
static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
{
int allocation, runs;
bool ret = false;
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;
/*
* The first run is discarded due to inaccurate value from
* phase transition.
*/
for (runs = NUM_OF_RUNS * allocation + 1;
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 - 1);
avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
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_MAX - 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)
{
char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
unsigned long bw_imc[1024], bw_resc[1024];
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,
};
int ret;
remove(RESULT_FILE_NAME);
ret = resctrl_val(test, uparams, uparams->benchmark_cmd, ¶m);
if (ret)
return ret;
ret = check_results();
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,
};
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