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selftests/resctrl: Add callback to start a benchmark
The callback starts a child process and puts the child pid in created resctrl group with specified memory bandwidth in schemata. The child starts running benchmark. Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Co-developed-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Babu Moger <babu.moger@amd.com> Co-developed-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Sai Praneeth Prakhya
Shuah Khan
parent
1d3f08687d
commit
7f4d257e3a
@ -3,6 +3,8 @@
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#ifndef RESCTRL_H
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#define RESCTRL_H
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#include <stdio.h>
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#include <stdarg.h>
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#include <math.h>
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#include <errno.h>
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#include <sched.h>
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#include <stdlib.h>
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@ -19,6 +21,7 @@
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#include <asm/unistd.h>
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#include <linux/perf_event.h>
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#define MB (1024 * 1024)
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#define RESCTRL_PATH "/sys/fs/resctrl"
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#define PHYS_ID_PATH "/sys/devices/system/cpu/cpu"
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@ -29,10 +32,35 @@
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exit(EXIT_FAILURE); \
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} while (0)
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/*
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* resctrl_val_param: resctrl test parameters
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* @resctrl_val: Resctrl feature (Eg: mbm, mba.. etc)
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* @ctrlgrp: Name of the control monitor group (con_mon grp)
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* @mongrp: Name of the monitor group (mon grp)
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* @cpu_no: CPU number to which the benchmark would be binded
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* @span: Memory bytes accessed in each benchmark iteration
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* @mum_resctrlfs: Should the resctrl FS be remounted?
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* @filename: Name of file to which the o/p should be written
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* @bw_report: Bandwidth report type (reads vs writes)
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* @setup: Call back function to setup test environment
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*/
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struct resctrl_val_param {
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char *resctrl_val;
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char ctrlgrp[64];
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char mongrp[64];
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int cpu_no;
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unsigned long span;
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int mum_resctrlfs;
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char filename[64];
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char *bw_report;
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int (*setup)(int num, ...);
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};
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pid_t bm_pid, ppid;
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int remount_resctrlfs(bool mum_resctrlfs);
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int get_resource_id(int cpu_no, int *resource_id);
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int umount_resctrlfs(void);
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int validate_bw_report_request(char *bw_report);
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bool validate_resctrl_feature_request(char *resctrl_val);
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char *fgrep(FILE *inf, const char *str);
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@ -46,5 +74,6 @@ int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
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int group_fd, unsigned long flags);
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int run_fill_buf(unsigned long span, int malloc_and_init_memory, int memflush,
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int op, char *resctrl_va);
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int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param);
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#endif /* RESCTRL_H */
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@ -47,6 +47,8 @@ struct imc_counter_config {
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int fd;
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};
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static char mbm_total_path[1024];
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static int imcs;
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static struct imc_counter_config imc_counters_config[MAX_IMCS][2];
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void membw_initialize_perf_event_attr(int i, int j)
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@ -115,3 +117,575 @@ void get_event_and_umask(char *cas_count_cfg, int count, bool op)
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}
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}
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}
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static int open_perf_event(int i, int cpu_no, int j)
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{
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imc_counters_config[i][j].fd =
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perf_event_open(&imc_counters_config[i][j].pe, -1, cpu_no, -1,
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PERF_FLAG_FD_CLOEXEC);
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if (imc_counters_config[i][j].fd == -1) {
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fprintf(stderr, "Error opening leader %llx\n",
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imc_counters_config[i][j].pe.config);
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return -1;
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}
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return 0;
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}
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/* Get type and config (read and write) of an iMC counter */
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static int read_from_imc_dir(char *imc_dir, int count)
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{
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char cas_count_cfg[1024], imc_counter_cfg[1024], imc_counter_type[1024];
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FILE *fp;
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/* Get type of iMC counter */
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sprintf(imc_counter_type, "%s%s", imc_dir, "type");
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fp = fopen(imc_counter_type, "r");
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if (!fp) {
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perror("Failed to open imc counter type file");
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return -1;
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}
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if (fscanf(fp, "%u", &imc_counters_config[count][READ].type) <= 0) {
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perror("Could not get imc type");
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fclose(fp);
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return -1;
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}
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fclose(fp);
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imc_counters_config[count][WRITE].type =
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imc_counters_config[count][READ].type;
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/* Get read config */
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sprintf(imc_counter_cfg, "%s%s", imc_dir, READ_FILE_NAME);
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fp = fopen(imc_counter_cfg, "r");
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if (!fp) {
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perror("Failed to open imc config file");
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return -1;
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}
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if (fscanf(fp, "%s", cas_count_cfg) <= 0) {
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perror("Could not get imc cas count read");
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fclose(fp);
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return -1;
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}
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fclose(fp);
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get_event_and_umask(cas_count_cfg, count, READ);
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/* Get write config */
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sprintf(imc_counter_cfg, "%s%s", imc_dir, WRITE_FILE_NAME);
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fp = fopen(imc_counter_cfg, "r");
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if (!fp) {
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perror("Failed to open imc config file");
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return -1;
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}
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if (fscanf(fp, "%s", cas_count_cfg) <= 0) {
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perror("Could not get imc cas count write");
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fclose(fp);
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return -1;
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}
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fclose(fp);
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get_event_and_umask(cas_count_cfg, count, WRITE);
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return 0;
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}
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/*
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* A system can have 'n' number of iMC (Integrated Memory Controller)
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* counters, get that 'n'. For each iMC counter get it's type and config.
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* Also, each counter has two configs, one for read and the other for write.
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* A config again has two parts, event and umask.
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* Enumerate all these details into an array of structures.
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*
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* Return: >= 0 on success. < 0 on failure.
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*/
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static int num_of_imcs(void)
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{
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unsigned int count = 0;
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char imc_dir[512];
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struct dirent *ep;
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int ret;
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DIR *dp;
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dp = opendir(DYN_PMU_PATH);
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if (dp) {
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while ((ep = readdir(dp))) {
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if (strstr(ep->d_name, UNCORE_IMC)) {
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sprintf(imc_dir, "%s/%s/", DYN_PMU_PATH,
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ep->d_name);
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ret = read_from_imc_dir(imc_dir, count);
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if (ret) {
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closedir(dp);
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return ret;
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}
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count++;
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}
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}
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closedir(dp);
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if (count == 0) {
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perror("Unable find iMC counters!\n");
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return -1;
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}
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} else {
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perror("Unable to open PMU directory!\n");
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return -1;
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}
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return count;
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}
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static int initialize_mem_bw_imc(void)
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{
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int imc, j;
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imcs = num_of_imcs();
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if (imcs <= 0)
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return imcs;
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/* Initialize perf_event_attr structures for all iMC's */
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for (imc = 0; imc < imcs; imc++) {
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for (j = 0; j < 2; j++)
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membw_initialize_perf_event_attr(imc, j);
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}
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return 0;
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}
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/*
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* get_mem_bw_imc: Memory band width as reported by iMC counters
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* @cpu_no: CPU number that the benchmark PID is binded to
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* @bw_report: Bandwidth report type (reads, writes)
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*
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* Memory B/W utilized by a process on a socket can be calculated using
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* iMC counters. Perf events are used to read these counters.
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*
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* Return: >= 0 on success. < 0 on failure.
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*/
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static float get_mem_bw_imc(int cpu_no, char *bw_report)
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{
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float reads, writes, of_mul_read, of_mul_write;
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int imc, j, ret;
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/* Start all iMC counters to log values (both read and write) */
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reads = 0, writes = 0, of_mul_read = 1, of_mul_write = 1;
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for (imc = 0; imc < imcs; imc++) {
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for (j = 0; j < 2; j++) {
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ret = open_perf_event(imc, cpu_no, j);
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if (ret)
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return -1;
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}
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for (j = 0; j < 2; j++)
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membw_ioctl_perf_event_ioc_reset_enable(imc, j);
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}
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sleep(1);
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/* Stop counters after a second to get results (both read and write) */
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for (imc = 0; imc < imcs; imc++) {
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for (j = 0; j < 2; j++)
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membw_ioctl_perf_event_ioc_disable(imc, j);
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}
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/*
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* Get results which are stored in struct type imc_counter_config
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* Take over flow into consideration before calculating total b/w
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*/
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for (imc = 0; imc < imcs; imc++) {
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struct imc_counter_config *r =
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&imc_counters_config[imc][READ];
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struct imc_counter_config *w =
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&imc_counters_config[imc][WRITE];
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if (read(r->fd, &r->return_value,
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sizeof(struct membw_read_format)) == -1) {
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perror("Couldn't get read b/w through iMC");
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return -1;
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}
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if (read(w->fd, &w->return_value,
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sizeof(struct membw_read_format)) == -1) {
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perror("Couldn't get write bw through iMC");
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return -1;
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}
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__u64 r_time_enabled = r->return_value.time_enabled;
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__u64 r_time_running = r->return_value.time_running;
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if (r_time_enabled != r_time_running)
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of_mul_read = (float)r_time_enabled /
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(float)r_time_running;
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__u64 w_time_enabled = w->return_value.time_enabled;
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__u64 w_time_running = w->return_value.time_running;
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if (w_time_enabled != w_time_running)
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of_mul_write = (float)w_time_enabled /
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(float)w_time_running;
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reads += r->return_value.value * of_mul_read * SCALE;
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writes += w->return_value.value * of_mul_write * SCALE;
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}
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for (imc = 0; imc < imcs; imc++) {
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close(imc_counters_config[imc][READ].fd);
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close(imc_counters_config[imc][WRITE].fd);
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}
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if (strcmp(bw_report, "reads") == 0)
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return reads;
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if (strcmp(bw_report, "writes") == 0)
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return writes;
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return (reads + writes);
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}
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void set_mbm_path(const char *ctrlgrp, const char *mongrp, int resource_id)
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{
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if (ctrlgrp && mongrp)
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sprintf(mbm_total_path, CON_MON_MBM_LOCAL_BYTES_PATH,
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RESCTRL_PATH, ctrlgrp, mongrp, resource_id);
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else if (!ctrlgrp && mongrp)
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sprintf(mbm_total_path, MON_MBM_LOCAL_BYTES_PATH, RESCTRL_PATH,
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mongrp, resource_id);
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else if (ctrlgrp && !mongrp)
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sprintf(mbm_total_path, CON_MBM_LOCAL_BYTES_PATH, RESCTRL_PATH,
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ctrlgrp, resource_id);
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else if (!ctrlgrp && !mongrp)
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sprintf(mbm_total_path, MBM_LOCAL_BYTES_PATH, RESCTRL_PATH,
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resource_id);
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}
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/*
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* initialize_mem_bw_resctrl: Appropriately populate "mbm_total_path"
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* @ctrlgrp: Name of the control monitor group (con_mon grp)
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* @mongrp: Name of the monitor group (mon grp)
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* @cpu_no: CPU number that the benchmark PID is binded to
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* @resctrl_val: Resctrl feature (Eg: mbm, mba.. etc)
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*/
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static void initialize_mem_bw_resctrl(const char *ctrlgrp, const char *mongrp,
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int cpu_no, char *resctrl_val)
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{
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int resource_id;
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if (get_resource_id(cpu_no, &resource_id) < 0) {
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perror("Could not get resource_id");
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return;
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}
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if (strcmp(resctrl_val, "mbm") == 0)
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set_mbm_path(ctrlgrp, mongrp, resource_id);
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if ((strcmp(resctrl_val, "mba") == 0)) {
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if (ctrlgrp)
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sprintf(mbm_total_path, CON_MBM_LOCAL_BYTES_PATH,
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RESCTRL_PATH, ctrlgrp, resource_id);
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else
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sprintf(mbm_total_path, MBM_LOCAL_BYTES_PATH,
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RESCTRL_PATH, resource_id);
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}
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}
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/*
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* Get MBM Local bytes as reported by resctrl FS
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* For MBM,
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* 1. If con_mon grp and mon grp are given, then read from con_mon grp's mon grp
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* 2. If only con_mon grp is given, then read from con_mon grp
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* 3. If both are not given, then read from root con_mon grp
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* For MBA,
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* 1. If con_mon grp is given, then read from it
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* 2. If con_mon grp is not given, then read from root con_mon grp
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*/
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static unsigned long get_mem_bw_resctrl(void)
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{
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unsigned long mbm_total = 0;
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FILE *fp;
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fp = fopen(mbm_total_path, "r");
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if (!fp) {
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perror("Failed to open total bw file");
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return -1;
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}
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if (fscanf(fp, "%lu", &mbm_total) <= 0) {
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perror("Could not get mbm local bytes");
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fclose(fp);
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return -1;
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}
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fclose(fp);
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return mbm_total;
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}
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pid_t bm_pid, ppid;
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static void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
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{
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kill(bm_pid, SIGKILL);
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printf("Ending\n\n");
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exit(EXIT_SUCCESS);
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}
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/*
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* print_results_bw: the memory bandwidth results are stored in a file
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* @filename: file that stores the results
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* @bm_pid: child pid that runs benchmark
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* @bw_imc: perf imc counter value
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* @bw_resc: memory bandwidth value
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*
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* Return: 0 on success. non-zero on failure.
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*/
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static int print_results_bw(char *filename, int bm_pid, float bw_imc,
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unsigned long bw_resc)
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{
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unsigned long diff = fabs(bw_imc - bw_resc);
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FILE *fp;
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if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {
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printf("Pid: %d \t Mem_BW_iMC: %f \t ", bm_pid, bw_imc);
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printf("Mem_BW_resc: %lu \t Difference: %lu\n", bw_resc, diff);
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} else {
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fp = fopen(filename, "a");
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if (!fp) {
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perror("Cannot open results file");
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return errno;
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}
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if (fprintf(fp, "Pid: %d \t Mem_BW_iMC: %f \t Mem_BW_resc: %lu \t Difference: %lu\n",
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bm_pid, bw_imc, bw_resc, diff) <= 0) {
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fclose(fp);
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perror("Could not log results.");
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return errno;
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}
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fclose(fp);
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}
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return 0;
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}
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static int
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measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
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{
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unsigned long bw_imc, bw_resc, bw_resc_end;
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int ret;
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/*
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* Measure memory bandwidth from resctrl and from
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* another source which is perf imc value or could
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* be something else if perf imc event is not available.
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* Compare the two values to validate resctrl value.
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* It takes 1sec to measure the data.
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*/
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bw_imc = get_mem_bw_imc(param->cpu_no, param->bw_report);
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if (bw_imc <= 0)
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return bw_imc;
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bw_resc_end = get_mem_bw_resctrl();
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if (bw_resc_end <= 0)
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return bw_resc_end;
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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 ((strcmp(resctrl_val, "mba")) == 0 ||
|
||||
(strcmp(resctrl_val, "mbm")) == 0) {
|
||||
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 ((strcmp(resctrl_val, "mbm") == 0) ||
|
||||
(strcmp(resctrl_val, "mba") == 0)) {
|
||||
ret = initialize_mem_bw_imc();
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
initialize_mem_bw_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 (strcmp(resctrl_val, "mbm") == 0) {
|
||||
ret = param->setup(1, param);
|
||||
if (ret) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
ret = measure_vals(param, &bw_resc_start);
|
||||
if (ret)
|
||||
break;
|
||||
} else if ((strcmp(resctrl_val, "mba") == 0)) {
|
||||
ret = param->setup(1, param);
|
||||
if (ret) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
ret = measure_vals(param, &bw_resc_start);
|
||||
if (ret)
|
||||
break;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
kill(bm_pid, SIGKILL);
|
||||
umount_resctrlfs();
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user