| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Memory bandwidth monitoring and allocation library |
| * |
| * Copyright (C) 2018 Intel Corporation |
| * |
| * Authors: |
| * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>, |
| * Fenghua Yu <fenghua.yu@intel.com> |
| */ |
| #include "resctrl.h" |
| |
| #define UNCORE_IMC "uncore_imc" |
| #define READ_FILE_NAME "events/cas_count_read" |
| #define WRITE_FILE_NAME "events/cas_count_write" |
| #define DYN_PMU_PATH "/sys/bus/event_source/devices" |
| #define SCALE 0.00006103515625 |
| #define MAX_IMCS 20 |
| #define MAX_TOKENS 5 |
| #define READ 0 |
| #define WRITE 1 |
| #define CON_MON_MBM_LOCAL_BYTES_PATH \ |
| "%s/%s/mon_groups/%s/mon_data/mon_L3_%02d/mbm_local_bytes" |
| |
| #define CON_MBM_LOCAL_BYTES_PATH \ |
| "%s/%s/mon_data/mon_L3_%02d/mbm_local_bytes" |
| |
| #define MON_MBM_LOCAL_BYTES_PATH \ |
| "%s/mon_groups/%s/mon_data/mon_L3_%02d/mbm_local_bytes" |
| |
| #define MBM_LOCAL_BYTES_PATH \ |
| "%s/mon_data/mon_L3_%02d/mbm_local_bytes" |
| |
| #define CON_MON_LCC_OCCUP_PATH \ |
| "%s/%s/mon_groups/%s/mon_data/mon_L3_%02d/llc_occupancy" |
| |
| #define CON_LCC_OCCUP_PATH \ |
| "%s/%s/mon_data/mon_L3_%02d/llc_occupancy" |
| |
| #define MON_LCC_OCCUP_PATH \ |
| "%s/mon_groups/%s/mon_data/mon_L3_%02d/llc_occupancy" |
| |
| #define LCC_OCCUP_PATH \ |
| "%s/mon_data/mon_L3_%02d/llc_occupancy" |
| |
| struct membw_read_format { |
| __u64 value; /* The value of the event */ |
| __u64 time_enabled; /* if PERF_FORMAT_TOTAL_TIME_ENABLED */ |
| __u64 time_running; /* if PERF_FORMAT_TOTAL_TIME_RUNNING */ |
| __u64 id; /* if PERF_FORMAT_ID */ |
| }; |
| |
| struct imc_counter_config { |
| __u32 type; |
| __u64 event; |
| __u64 umask; |
| struct perf_event_attr pe; |
| struct membw_read_format return_value; |
| int fd; |
| }; |
| |
| static char mbm_total_path[1024]; |
| static int imcs; |
| static struct imc_counter_config imc_counters_config[MAX_IMCS][2]; |
| |
| void membw_initialize_perf_event_attr(int i, int j) |
| { |
| memset(&imc_counters_config[i][j].pe, 0, |
| sizeof(struct perf_event_attr)); |
| imc_counters_config[i][j].pe.type = imc_counters_config[i][j].type; |
| imc_counters_config[i][j].pe.size = sizeof(struct perf_event_attr); |
| imc_counters_config[i][j].pe.disabled = 1; |
| imc_counters_config[i][j].pe.inherit = 1; |
| imc_counters_config[i][j].pe.exclude_guest = 0; |
| imc_counters_config[i][j].pe.config = |
| imc_counters_config[i][j].umask << 8 | |
| imc_counters_config[i][j].event; |
| imc_counters_config[i][j].pe.sample_type = PERF_SAMPLE_IDENTIFIER; |
| imc_counters_config[i][j].pe.read_format = |
| PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING; |
| } |
| |
| void membw_ioctl_perf_event_ioc_reset_enable(int i, int j) |
| { |
| ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_RESET, 0); |
| ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_ENABLE, 0); |
| } |
| |
| void membw_ioctl_perf_event_ioc_disable(int i, int j) |
| { |
| ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_DISABLE, 0); |
| } |
| |
| /* |
| * get_event_and_umask: Parse config into event and umask |
| * @cas_count_cfg: Config |
| * @count: iMC number |
| * @op: Operation (read/write) |
| */ |
| void get_event_and_umask(char *cas_count_cfg, int count, bool op) |
| { |
| char *token[MAX_TOKENS]; |
| int i = 0; |
| |
| strcat(cas_count_cfg, ","); |
| token[0] = strtok(cas_count_cfg, "=,"); |
| |
| for (i = 1; i < MAX_TOKENS; i++) |
| token[i] = strtok(NULL, "=,"); |
| |
| for (i = 0; i < MAX_TOKENS; i++) { |
| if (!token[i]) |
| break; |
| if (strcmp(token[i], "event") == 0) { |
| if (op == READ) |
| imc_counters_config[count][READ].event = |
| strtol(token[i + 1], NULL, 16); |
| else |
| imc_counters_config[count][WRITE].event = |
| strtol(token[i + 1], NULL, 16); |
| } |
| if (strcmp(token[i], "umask") == 0) { |
| if (op == READ) |
| imc_counters_config[count][READ].umask = |
| strtol(token[i + 1], NULL, 16); |
| else |
| imc_counters_config[count][WRITE].umask = |
| strtol(token[i + 1], NULL, 16); |
| } |
| } |
| } |
| |
| static int open_perf_event(int i, int cpu_no, int j) |
| { |
| imc_counters_config[i][j].fd = |
| perf_event_open(&imc_counters_config[i][j].pe, -1, cpu_no, -1, |
| PERF_FLAG_FD_CLOEXEC); |
| |
| if (imc_counters_config[i][j].fd == -1) { |
| fprintf(stderr, "Error opening leader %llx\n", |
| imc_counters_config[i][j].pe.config); |
| |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* Get type and config (read and write) of an iMC counter */ |
| static int read_from_imc_dir(char *imc_dir, int count) |
| { |
| char cas_count_cfg[1024], imc_counter_cfg[1024], imc_counter_type[1024]; |
| FILE *fp; |
| |
| /* Get type of iMC counter */ |
| sprintf(imc_counter_type, "%s%s", imc_dir, "type"); |
| fp = fopen(imc_counter_type, "r"); |
| if (!fp) { |
| perror("Failed to open imc counter type file"); |
| |
| return -1; |
| } |
| if (fscanf(fp, "%u", &imc_counters_config[count][READ].type) <= 0) { |
| perror("Could not get imc type"); |
| fclose(fp); |
| |
| return -1; |
| } |
| fclose(fp); |
| |
| imc_counters_config[count][WRITE].type = |
| imc_counters_config[count][READ].type; |
| |
| /* Get read config */ |
| sprintf(imc_counter_cfg, "%s%s", imc_dir, READ_FILE_NAME); |
| fp = fopen(imc_counter_cfg, "r"); |
| if (!fp) { |
| perror("Failed to open imc config file"); |
| |
| return -1; |
| } |
| if (fscanf(fp, "%s", cas_count_cfg) <= 0) { |
| perror("Could not get imc cas count read"); |
| fclose(fp); |
| |
| return -1; |
| } |
| fclose(fp); |
| |
| get_event_and_umask(cas_count_cfg, count, READ); |
| |
| /* Get write config */ |
| sprintf(imc_counter_cfg, "%s%s", imc_dir, WRITE_FILE_NAME); |
| fp = fopen(imc_counter_cfg, "r"); |
| if (!fp) { |
| perror("Failed to open imc config file"); |
| |
| return -1; |
| } |
| if (fscanf(fp, "%s", cas_count_cfg) <= 0) { |
| perror("Could not get imc cas count write"); |
| fclose(fp); |
| |
| return -1; |
| } |
| fclose(fp); |
| |
| get_event_and_umask(cas_count_cfg, count, WRITE); |
| |
| return 0; |
| } |
| |
| /* |
| * A system can have 'n' number of iMC (Integrated Memory Controller) |
| * counters, get that 'n'. For each iMC counter get it's type and config. |
| * Also, each counter has two configs, one for read and the other for write. |
| * A config again has two parts, event and umask. |
| * Enumerate all these details into an array of structures. |
| * |
| * Return: >= 0 on success. < 0 on failure. |
| */ |
| static int num_of_imcs(void) |
| { |
| char imc_dir[512], *temp; |
| unsigned int count = 0; |
| struct dirent *ep; |
| int ret; |
| DIR *dp; |
| |
| dp = opendir(DYN_PMU_PATH); |
| if (dp) { |
| while ((ep = readdir(dp))) { |
| temp = strstr(ep->d_name, UNCORE_IMC); |
| if (!temp) |
| continue; |
| |
| /* |
| * imc counters are named as "uncore_imc_<n>", hence |
| * increment the pointer to point to <n>. Note that |
| * sizeof(UNCORE_IMC) would count for null character as |
| * well and hence the last underscore character in |
| * uncore_imc'_' need not be counted. |
| */ |
| temp = temp + sizeof(UNCORE_IMC); |
| |
| /* |
| * Some directories under "DYN_PMU_PATH" could have |
| * names like "uncore_imc_free_running", hence, check if |
| * first character is a numerical digit or not. |
| */ |
| if (temp[0] >= '0' && temp[0] <= '9') { |
| sprintf(imc_dir, "%s/%s/", DYN_PMU_PATH, |
| ep->d_name); |
| ret = read_from_imc_dir(imc_dir, count); |
| if (ret) { |
| closedir(dp); |
| |
| return ret; |
| } |
| count++; |
| } |
| } |
| closedir(dp); |
| if (count == 0) { |
| perror("Unable find iMC counters!\n"); |
| |
| return -1; |
| } |
| } else { |
| perror("Unable to open PMU directory!\n"); |
| |
| return -1; |
| } |
| |
| return count; |
| } |
| |
| static int initialize_mem_bw_imc(void) |
| { |
| int imc, j; |
| |
| imcs = num_of_imcs(); |
| if (imcs <= 0) |
| return imcs; |
| |
| /* Initialize perf_event_attr structures for all iMC's */ |
| for (imc = 0; imc < imcs; imc++) { |
| for (j = 0; j < 2; j++) |
| membw_initialize_perf_event_attr(imc, j); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * get_mem_bw_imc: Memory band width as reported by iMC counters |
| * @cpu_no: CPU number that the benchmark PID is binded to |
| * @bw_report: Bandwidth report type (reads, writes) |
| * |
| * Memory B/W utilized by a process on a socket can be calculated using |
| * iMC counters. Perf events are used to read these counters. |
| * |
| * Return: = 0 on success. < 0 on failure. |
| */ |
| static int get_mem_bw_imc(int cpu_no, char *bw_report, float *bw_imc) |
| { |
| float reads, writes, of_mul_read, of_mul_write; |
| int imc, j, ret; |
| |
| /* Start all iMC counters to log values (both read and write) */ |
| reads = 0, writes = 0, of_mul_read = 1, of_mul_write = 1; |
| for (imc = 0; imc < imcs; imc++) { |
| for (j = 0; j < 2; j++) { |
| ret = open_perf_event(imc, cpu_no, j); |
| if (ret) |
| return -1; |
| } |
| for (j = 0; j < 2; j++) |
| membw_ioctl_perf_event_ioc_reset_enable(imc, j); |
| } |
| |
| sleep(1); |
| |
| /* Stop counters after a second to get results (both read and write) */ |
| for (imc = 0; imc < imcs; imc++) { |
| for (j = 0; j < 2; j++) |
| membw_ioctl_perf_event_ioc_disable(imc, j); |
| } |
| |
| /* |
| * Get results which are stored in struct type imc_counter_config |
| * Take over flow into consideration before calculating total b/w |
| */ |
| for (imc = 0; imc < imcs; imc++) { |
| struct imc_counter_config *r = |
| &imc_counters_config[imc][READ]; |
| struct imc_counter_config *w = |
| &imc_counters_config[imc][WRITE]; |
| |
| if (read(r->fd, &r->return_value, |
| sizeof(struct membw_read_format)) == -1) { |
| perror("Couldn't get read b/w through iMC"); |
| |
| return -1; |
| } |
| |
| if (read(w->fd, &w->return_value, |
| sizeof(struct membw_read_format)) == -1) { |
| perror("Couldn't get write bw through iMC"); |
| |
| return -1; |
| } |
| |
| __u64 r_time_enabled = r->return_value.time_enabled; |
| __u64 r_time_running = r->return_value.time_running; |
| |
| if (r_time_enabled != r_time_running) |
| of_mul_read = (float)r_time_enabled / |
| (float)r_time_running; |
| |
| __u64 w_time_enabled = w->return_value.time_enabled; |
| __u64 w_time_running = w->return_value.time_running; |
| |
| if (w_time_enabled != w_time_running) |
| of_mul_write = (float)w_time_enabled / |
| (float)w_time_running; |
| reads += r->return_value.value * of_mul_read * SCALE; |
| writes += w->return_value.value * of_mul_write * SCALE; |
| } |
| |
| for (imc = 0; imc < imcs; imc++) { |
| close(imc_counters_config[imc][READ].fd); |
| close(imc_counters_config[imc][WRITE].fd); |
| } |
| |
| if (strcmp(bw_report, "reads") == 0) { |
| *bw_imc = reads; |
| return 0; |
| } |
| |
| if (strcmp(bw_report, "writes") == 0) { |
| *bw_imc = writes; |
| return 0; |
| } |
| |
| *bw_imc = reads + writes; |
| return 0; |
| } |
| |
| void set_mbm_path(const char *ctrlgrp, const char *mongrp, int resource_id) |
| { |
| if (ctrlgrp && mongrp) |
| sprintf(mbm_total_path, CON_MON_MBM_LOCAL_BYTES_PATH, |
| RESCTRL_PATH, ctrlgrp, mongrp, resource_id); |
| else if (!ctrlgrp && mongrp) |
| sprintf(mbm_total_path, MON_MBM_LOCAL_BYTES_PATH, RESCTRL_PATH, |
| mongrp, resource_id); |
| else if (ctrlgrp && !mongrp) |
| sprintf(mbm_total_path, CON_MBM_LOCAL_BYTES_PATH, RESCTRL_PATH, |
| ctrlgrp, resource_id); |
| else if (!ctrlgrp && !mongrp) |
| sprintf(mbm_total_path, MBM_LOCAL_BYTES_PATH, RESCTRL_PATH, |
| resource_id); |
| } |
| |
| /* |
| * initialize_mem_bw_resctrl: Appropriately populate "mbm_total_path" |
| * @ctrlgrp: Name of the control monitor group (con_mon grp) |
| * @mongrp: Name of the monitor group (mon grp) |
| * @cpu_no: CPU number that the benchmark PID is binded to |
| * @resctrl_val: Resctrl feature (Eg: mbm, mba.. etc) |
| */ |
| static void initialize_mem_bw_resctrl(const char *ctrlgrp, const char *mongrp, |
| int cpu_no, char *resctrl_val) |
| { |
| int resource_id; |
| |
| if (get_resource_id(cpu_no, &resource_id) < 0) { |
| perror("Could not get resource_id"); |
| return; |
| } |
| |
| if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) |
| set_mbm_path(ctrlgrp, mongrp, resource_id); |
| |
| if (!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) { |
| if (ctrlgrp) |
| sprintf(mbm_total_path, CON_MBM_LOCAL_BYTES_PATH, |
| RESCTRL_PATH, ctrlgrp, resource_id); |
| else |
| sprintf(mbm_total_path, MBM_LOCAL_BYTES_PATH, |
| RESCTRL_PATH, resource_id); |
| } |
| } |
| |
| /* |
| * Get MBM Local bytes as reported by resctrl FS |
| * For MBM, |
| * 1. If con_mon grp and mon grp are given, then read from con_mon grp's mon grp |
| * 2. If only con_mon grp is given, then read from con_mon grp |
| * 3. If both are not given, then read from root con_mon grp |
| * For MBA, |
| * 1. If con_mon grp is given, then read from it |
| * 2. If con_mon grp is not given, then read from root con_mon grp |
| */ |
| static int get_mem_bw_resctrl(unsigned long *mbm_total) |
| { |
| FILE *fp; |
| |
| fp = fopen(mbm_total_path, "r"); |
| if (!fp) { |
| perror("Failed to open total bw file"); |
| |
| return -1; |
| } |
| if (fscanf(fp, "%lu", mbm_total) <= 0) { |
| perror("Could not get mbm local bytes"); |
| fclose(fp); |
| |
| return -1; |
| } |
| fclose(fp); |
| |
| return 0; |
| } |
| |
| pid_t bm_pid, ppid; |
| |
| void ctrlc_handler(int signum, siginfo_t *info, void *ptr) |
| { |
| kill(bm_pid, SIGKILL); |
| umount_resctrlfs(); |
| tests_cleanup(); |
| printf("Ending\n\n"); |
| |
| exit(EXIT_SUCCESS); |
| } |
| |
| /* |
| * print_results_bw: the memory bandwidth results are stored in a file |
| * @filename: file that stores the results |
| * @bm_pid: child pid that runs benchmark |
| * @bw_imc: perf imc counter value |
| * @bw_resc: memory bandwidth value |
| * |
| * Return: 0 on success. non-zero on failure. |
| */ |
| static int print_results_bw(char *filename, int bm_pid, float bw_imc, |
| unsigned long bw_resc) |
| { |
| unsigned long diff = fabs(bw_imc - bw_resc); |
| FILE *fp; |
| |
| if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) { |
| printf("Pid: %d \t Mem_BW_iMC: %f \t ", bm_pid, bw_imc); |
| printf("Mem_BW_resc: %lu \t Difference: %lu\n", bw_resc, diff); |
| } else { |
| fp = fopen(filename, "a"); |
| if (!fp) { |
| perror("Cannot open results file"); |
| |
| return errno; |
| } |
| if (fprintf(fp, "Pid: %d \t Mem_BW_iMC: %f \t Mem_BW_resc: %lu \t Difference: %lu\n", |
| bm_pid, bw_imc, bw_resc, diff) <= 0) { |
| fclose(fp); |
| perror("Could not log results."); |
| |
| return errno; |
| } |
| fclose(fp); |
| } |
| |
| return 0; |
| } |
| |
| static void set_cqm_path(const char *ctrlgrp, const char *mongrp, char sock_num) |
| { |
| if (strlen(ctrlgrp) && strlen(mongrp)) |
| sprintf(llc_occup_path, CON_MON_LCC_OCCUP_PATH, RESCTRL_PATH, |
| ctrlgrp, mongrp, sock_num); |
| else if (!strlen(ctrlgrp) && strlen(mongrp)) |
| sprintf(llc_occup_path, MON_LCC_OCCUP_PATH, RESCTRL_PATH, |
| mongrp, sock_num); |
| else if (strlen(ctrlgrp) && !strlen(mongrp)) |
| sprintf(llc_occup_path, CON_LCC_OCCUP_PATH, RESCTRL_PATH, |
| ctrlgrp, sock_num); |
| else if (!strlen(ctrlgrp) && !strlen(mongrp)) |
| sprintf(llc_occup_path, LCC_OCCUP_PATH, RESCTRL_PATH, sock_num); |
| } |
| |
| /* |
| * initialize_llc_occu_resctrl: Appropriately populate "llc_occup_path" |
| * @ctrlgrp: Name of the control monitor group (con_mon grp) |
| * @mongrp: Name of the monitor group (mon grp) |
| * @cpu_no: CPU number that the benchmark PID is binded to |
| * @resctrl_val: Resctrl feature (Eg: cat, cqm.. etc) |
| */ |
| static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp, |
| int cpu_no, char *resctrl_val) |
| { |
| int resource_id; |
| |
| if (get_resource_id(cpu_no, &resource_id) < 0) { |
| perror("# Unable to resource_id"); |
| return; |
| } |
| |
| if (!strncmp(resctrl_val, CQM_STR, sizeof(CQM_STR))) |
| set_cqm_path(ctrlgrp, mongrp, resource_id); |
| } |
| |
| static int |
| measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start) |
| { |
| unsigned long bw_resc, bw_resc_end; |
| float bw_imc; |
| int ret; |
| |
| /* |
| * Measure memory bandwidth from resctrl and from |
| * another source which is perf imc value or could |
| * be something else if perf imc event is not available. |
| * Compare the two values to validate resctrl value. |
| * It takes 1sec to measure the data. |
| */ |
| ret = get_mem_bw_imc(param->cpu_no, param->bw_report, &bw_imc); |
| if (ret < 0) |
| return ret; |
| |
| ret = get_mem_bw_resctrl(&bw_resc_end); |
| if (ret < 0) |
| return ret; |
| |
| bw_resc = (bw_resc_end - *bw_resc_start) / MB; |
| ret = print_results_bw(param->filename, bm_pid, bw_imc, bw_resc); |
| if (ret) |
| return ret; |
| |
| *bw_resc_start = bw_resc_end; |
| |
| return 0; |
| } |
| |
| /* |
| * resctrl_val: execute benchmark and measure memory bandwidth on |
| * the benchmark |
| * @benchmark_cmd: benchmark command and its arguments |
| * @param: parameters passed to resctrl_val() |
| * |
| * Return: 0 on success. non-zero on failure. |
| */ |
| int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param) |
| { |
| char *resctrl_val = param->resctrl_val; |
| unsigned long bw_resc_start = 0; |
| struct sigaction sigact; |
| int ret = 0, pipefd[2]; |
| char pipe_message = 0; |
| union sigval value; |
| |
| if (strcmp(param->filename, "") == 0) |
| sprintf(param->filename, "stdio"); |
| |
| if (!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR)) || |
| !strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) { |
| ret = validate_bw_report_request(param->bw_report); |
| if (ret) |
| return ret; |
| } |
| |
| ret = remount_resctrlfs(param->mum_resctrlfs); |
| if (ret) |
| return ret; |
| |
| /* |
| * If benchmark wasn't successfully started by child, then child should |
| * kill parent, so save parent's pid |
| */ |
| ppid = getpid(); |
| |
| if (pipe(pipefd)) { |
| perror("# Unable to create pipe"); |
| |
| return -1; |
| } |
| |
| /* |
| * Fork to start benchmark, save child's pid so that it can be killed |
| * when needed |
| */ |
| bm_pid = fork(); |
| if (bm_pid == -1) { |
| perror("# Unable to fork"); |
| |
| return -1; |
| } |
| |
| if (bm_pid == 0) { |
| /* |
| * Mask all signals except SIGUSR1, parent uses SIGUSR1 to |
| * start benchmark |
| */ |
| sigfillset(&sigact.sa_mask); |
| sigdelset(&sigact.sa_mask, SIGUSR1); |
| |
| sigact.sa_sigaction = run_benchmark; |
| sigact.sa_flags = SA_SIGINFO; |
| |
| /* Register for "SIGUSR1" signal from parent */ |
| if (sigaction(SIGUSR1, &sigact, NULL)) |
| PARENT_EXIT("Can't register child for signal"); |
| |
| /* Tell parent that child is ready */ |
| close(pipefd[0]); |
| pipe_message = 1; |
| if (write(pipefd[1], &pipe_message, sizeof(pipe_message)) < |
| sizeof(pipe_message)) { |
| perror("# failed signaling parent process"); |
| close(pipefd[1]); |
| return -1; |
| } |
| close(pipefd[1]); |
| |
| /* Suspend child until delivery of "SIGUSR1" from parent */ |
| sigsuspend(&sigact.sa_mask); |
| |
| PARENT_EXIT("Child is done"); |
| } |
| |
| printf("# benchmark PID: %d\n", bm_pid); |
| |
| /* |
| * Register CTRL-C handler for parent, as it has to kill benchmark |
| * before exiting |
| */ |
| sigact.sa_sigaction = ctrlc_handler; |
| sigemptyset(&sigact.sa_mask); |
| sigact.sa_flags = SA_SIGINFO; |
| if (sigaction(SIGINT, &sigact, NULL) || |
| sigaction(SIGHUP, &sigact, NULL)) { |
| perror("# sigaction"); |
| ret = errno; |
| goto out; |
| } |
| |
| value.sival_ptr = benchmark_cmd; |
| |
| /* Taskset benchmark to specified cpu */ |
| ret = taskset_benchmark(bm_pid, param->cpu_no); |
| if (ret) |
| goto out; |
| |
| /* Write benchmark to specified control&monitoring grp in resctrl FS */ |
| ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp, |
| resctrl_val); |
| if (ret) |
| goto out; |
| |
| if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) || |
| !strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) { |
| ret = initialize_mem_bw_imc(); |
| if (ret) |
| goto out; |
| |
| initialize_mem_bw_resctrl(param->ctrlgrp, param->mongrp, |
| param->cpu_no, resctrl_val); |
| } else if (!strncmp(resctrl_val, CQM_STR, sizeof(CQM_STR))) |
| initialize_llc_occu_resctrl(param->ctrlgrp, param->mongrp, |
| param->cpu_no, resctrl_val); |
| |
| /* Parent waits for child to be ready. */ |
| close(pipefd[1]); |
| while (pipe_message != 1) { |
| if (read(pipefd[0], &pipe_message, sizeof(pipe_message)) < |
| sizeof(pipe_message)) { |
| perror("# failed reading message from child process"); |
| close(pipefd[0]); |
| goto out; |
| } |
| } |
| close(pipefd[0]); |
| |
| /* Signal child to start benchmark */ |
| if (sigqueue(bm_pid, SIGUSR1, value) == -1) { |
| perror("# sigqueue SIGUSR1 to child"); |
| ret = errno; |
| goto out; |
| } |
| |
| /* Give benchmark enough time to fully run */ |
| sleep(1); |
| |
| /* Test runs until the callback setup() tells the test to stop. */ |
| while (1) { |
| if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) || |
| !strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) { |
| ret = param->setup(1, param); |
| if (ret) { |
| ret = 0; |
| break; |
| } |
| |
| ret = measure_vals(param, &bw_resc_start); |
| if (ret) |
| break; |
| } else if (!strncmp(resctrl_val, CQM_STR, sizeof(CQM_STR))) { |
| ret = param->setup(1, param); |
| if (ret) { |
| ret = 0; |
| break; |
| } |
| sleep(1); |
| ret = measure_cache_vals(param, bm_pid); |
| if (ret) |
| break; |
| } else { |
| break; |
| } |
| } |
| |
| out: |
| kill(bm_pid, SIGKILL); |
| umount_resctrlfs(); |
| |
| return ret; |
| } |