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314 lines
7.3 KiB
314 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <stdint.h> |
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#include "resctrl.h" |
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struct read_format { |
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__u64 nr; /* The number of events */ |
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struct { |
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__u64 value; /* The value of the event */ |
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} values[2]; |
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}; |
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static struct perf_event_attr pea_llc_miss; |
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static struct read_format rf_cqm; |
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static int fd_lm; |
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char llc_occup_path[1024]; |
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static void initialize_perf_event_attr(void) |
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{ |
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pea_llc_miss.type = PERF_TYPE_HARDWARE; |
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pea_llc_miss.size = sizeof(struct perf_event_attr); |
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pea_llc_miss.read_format = PERF_FORMAT_GROUP; |
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pea_llc_miss.exclude_kernel = 1; |
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pea_llc_miss.exclude_hv = 1; |
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pea_llc_miss.exclude_idle = 1; |
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pea_llc_miss.exclude_callchain_kernel = 1; |
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pea_llc_miss.inherit = 1; |
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pea_llc_miss.exclude_guest = 1; |
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pea_llc_miss.disabled = 1; |
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} |
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static void ioctl_perf_event_ioc_reset_enable(void) |
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{ |
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ioctl(fd_lm, PERF_EVENT_IOC_RESET, 0); |
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ioctl(fd_lm, PERF_EVENT_IOC_ENABLE, 0); |
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} |
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static int perf_event_open_llc_miss(pid_t pid, int cpu_no) |
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{ |
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fd_lm = perf_event_open(&pea_llc_miss, pid, cpu_no, -1, |
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PERF_FLAG_FD_CLOEXEC); |
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if (fd_lm == -1) { |
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perror("Error opening leader"); |
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ctrlc_handler(0, NULL, NULL); |
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return -1; |
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} |
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return 0; |
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} |
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static int initialize_llc_perf(void) |
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{ |
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memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr)); |
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memset(&rf_cqm, 0, sizeof(struct read_format)); |
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/* Initialize perf_event_attr structures for HW_CACHE_MISSES */ |
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initialize_perf_event_attr(); |
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pea_llc_miss.config = PERF_COUNT_HW_CACHE_MISSES; |
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rf_cqm.nr = 1; |
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return 0; |
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} |
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static int reset_enable_llc_perf(pid_t pid, int cpu_no) |
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{ |
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int ret = 0; |
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ret = perf_event_open_llc_miss(pid, cpu_no); |
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if (ret < 0) |
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return ret; |
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/* Start counters to log values */ |
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ioctl_perf_event_ioc_reset_enable(); |
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return 0; |
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} |
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/* |
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* get_llc_perf: llc cache miss through perf events |
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* @cpu_no: CPU number that the benchmark PID is binded to |
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* |
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* Perf events like HW_CACHE_MISSES could be used to validate number of |
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* cache lines allocated. |
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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 get_llc_perf(unsigned long *llc_perf_miss) |
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{ |
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__u64 total_misses; |
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/* Stop counters after one span to get miss rate */ |
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ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0); |
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if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) { |
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perror("Could not get llc misses through perf"); |
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return -1; |
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} |
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total_misses = rf_cqm.values[0].value; |
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close(fd_lm); |
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*llc_perf_miss = total_misses; |
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return 0; |
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} |
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/* |
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* Get LLC Occupancy as reported by RESCTRL FS |
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* For CMT, |
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* 1. If con_mon grp and mon grp given, then read from mon grp in |
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* con_mon grp |
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* 2. If only con_mon grp given, then read from con_mon grp |
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* 3. If both not given, then read from root con_mon grp |
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* For CAT, |
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* 1. If con_mon grp given, then read from it |
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* 2. If con_mon grp not given, then read from root con_mon grp |
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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 get_llc_occu_resctrl(unsigned long *llc_occupancy) |
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{ |
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FILE *fp; |
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fp = fopen(llc_occup_path, "r"); |
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if (!fp) { |
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perror("Failed to open results file"); |
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return errno; |
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} |
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if (fscanf(fp, "%lu", llc_occupancy) <= 0) { |
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perror("Could not get llc occupancy"); |
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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 0; |
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} |
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/* |
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* print_results_cache: the cache 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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* @llc_value: perf miss value / |
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* llc occupancy value reported by resctrl FS |
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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_cache(char *filename, int bm_pid, |
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unsigned long llc_value) |
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{ |
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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 LLC_value: %lu\n", bm_pid, |
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llc_value); |
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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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fprintf(fp, "Pid: %d \t llc_value: %lu\n", bm_pid, llc_value); |
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fclose(fp); |
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} |
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return 0; |
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} |
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int measure_cache_vals(struct resctrl_val_param *param, int bm_pid) |
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{ |
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unsigned long llc_perf_miss = 0, llc_occu_resc = 0, llc_value = 0; |
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int ret; |
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/* |
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* Measure cache miss from perf. |
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*/ |
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if (!strncmp(param->resctrl_val, CAT_STR, sizeof(CAT_STR))) { |
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ret = get_llc_perf(&llc_perf_miss); |
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if (ret < 0) |
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return ret; |
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llc_value = llc_perf_miss; |
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} |
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/* |
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* Measure llc occupancy from resctrl. |
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*/ |
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if (!strncmp(param->resctrl_val, CMT_STR, sizeof(CMT_STR))) { |
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ret = get_llc_occu_resctrl(&llc_occu_resc); |
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if (ret < 0) |
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return ret; |
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llc_value = llc_occu_resc; |
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} |
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ret = print_results_cache(param->filename, bm_pid, llc_value); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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/* |
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* cache_val: execute benchmark and measure LLC occupancy resctrl |
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* and perf cache miss for the benchmark |
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* @param: parameters passed to cache_val() |
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* |
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* Return: 0 on success. non-zero on failure. |
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*/ |
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int cat_val(struct resctrl_val_param *param) |
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{ |
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int malloc_and_init_memory = 1, memflush = 1, operation = 0, ret = 0; |
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char *resctrl_val = param->resctrl_val; |
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pid_t bm_pid; |
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if (strcmp(param->filename, "") == 0) |
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sprintf(param->filename, "stdio"); |
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bm_pid = getpid(); |
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/* Taskset benchmark to specified cpu */ |
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ret = taskset_benchmark(bm_pid, param->cpu_no); |
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if (ret) |
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return ret; |
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/* Write benchmark to specified con_mon grp, mon_grp in resctrl FS*/ |
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ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp, |
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resctrl_val); |
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if (ret) |
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return ret; |
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if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) { |
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ret = initialize_llc_perf(); |
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if (ret) |
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return ret; |
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} |
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/* Test runs until the callback setup() tells the test to stop. */ |
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while (1) { |
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if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) { |
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ret = param->setup(1, param); |
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if (ret) { |
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ret = 0; |
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break; |
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} |
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ret = reset_enable_llc_perf(bm_pid, param->cpu_no); |
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if (ret) |
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break; |
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if (run_fill_buf(param->span, malloc_and_init_memory, |
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memflush, operation, resctrl_val)) { |
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fprintf(stderr, "Error-running fill buffer\n"); |
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ret = -1; |
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break; |
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} |
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sleep(1); |
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ret = measure_cache_vals(param, bm_pid); |
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if (ret) |
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break; |
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} else { |
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break; |
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} |
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} |
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return ret; |
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} |
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/* |
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* show_cache_info: show cache test result information |
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* @sum_llc_val: sum of LLC cache result data |
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* @no_of_bits: number of bits |
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* @cache_span: cache span in bytes for CMT or in lines for CAT |
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* @max_diff: max difference |
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* @max_diff_percent: max difference percentage |
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* @num_of_runs: number of runs |
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* @platform: show test information on this platform |
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* @cmt: CMT test or CAT test |
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* |
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* Return: 0 on success. non-zero on failure. |
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*/ |
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int show_cache_info(unsigned long sum_llc_val, int no_of_bits, |
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unsigned long cache_span, unsigned long max_diff, |
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unsigned long max_diff_percent, unsigned long num_of_runs, |
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bool platform, bool cmt) |
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{ |
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unsigned long avg_llc_val = 0; |
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float diff_percent; |
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long avg_diff = 0; |
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int ret; |
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avg_llc_val = sum_llc_val / (num_of_runs - 1); |
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avg_diff = (long)abs(cache_span - avg_llc_val); |
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diff_percent = ((float)cache_span - avg_llc_val) / cache_span * 100; |
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ret = platform && abs((int)diff_percent) > max_diff_percent && |
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(cmt ? (abs(avg_diff) > max_diff) : true); |
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ksft_print_msg("%s Check cache miss rate within %d%%\n", |
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ret ? "Fail:" : "Pass:", max_diff_percent); |
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ksft_print_msg("Percent diff=%d\n", abs((int)diff_percent)); |
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ksft_print_msg("Number of bits: %d\n", no_of_bits); |
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ksft_print_msg("Average LLC val: %lu\n", avg_llc_val); |
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ksft_print_msg("Cache span (%s): %lu\n", cmt ? "bytes" : "lines", |
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cache_span); |
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return ret; |
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}
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