Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Fenghua Yu | 352 | 55.96% | 6 | 27.27% |
Ilpo Järvinen | 214 | 34.02% | 14 | 63.64% |
Sai Praneeth | 63 | 10.02% | 2 | 9.09% |
Total | 629 | 22 |
// SPDX-License-Identifier: GPL-2.0 #include <stdint.h> #include "resctrl.h" char llc_occup_path[1024]; void perf_event_attr_initialize(struct perf_event_attr *pea, __u64 config) { memset(pea, 0, sizeof(*pea)); pea->type = PERF_TYPE_HARDWARE; pea->size = sizeof(*pea); pea->read_format = PERF_FORMAT_GROUP; pea->exclude_kernel = 1; pea->exclude_hv = 1; pea->exclude_idle = 1; pea->exclude_callchain_kernel = 1; pea->inherit = 1; pea->exclude_guest = 1; pea->disabled = 1; pea->config = config; } /* Start counters to log values */ int perf_event_reset_enable(int pe_fd) { int ret; ret = ioctl(pe_fd, PERF_EVENT_IOC_RESET, 0); if (ret < 0) return ret; ret = ioctl(pe_fd, PERF_EVENT_IOC_ENABLE, 0); if (ret < 0) return ret; return 0; } void perf_event_initialize_read_format(struct perf_event_read *pe_read) { memset(pe_read, 0, sizeof(*pe_read)); pe_read->nr = 1; } int perf_open(struct perf_event_attr *pea, pid_t pid, int cpu_no) { int pe_fd; pe_fd = perf_event_open(pea, pid, cpu_no, -1, PERF_FLAG_FD_CLOEXEC); if (pe_fd == -1) { ksft_perror("Error opening leader"); return -1; } perf_event_reset_enable(pe_fd); return pe_fd; } /* * Get LLC Occupancy as reported by RESCTRL FS * For CMT, * 1. If con_mon grp and mon grp given, then read from mon grp in * con_mon grp * 2. If only con_mon grp given, then read from con_mon grp * 3. If both not given, then read from root con_mon grp * For CAT, * 1. If con_mon grp given, then read from it * 2. If con_mon grp not given, then read from root con_mon grp * * Return: =0 on success. <0 on failure. */ static int get_llc_occu_resctrl(unsigned long *llc_occupancy) { FILE *fp; fp = fopen(llc_occup_path, "r"); if (!fp) { ksft_perror("Failed to open results file"); return -1; } if (fscanf(fp, "%lu", llc_occupancy) <= 0) { ksft_perror("Could not get llc occupancy"); fclose(fp); return -1; } fclose(fp); return 0; } /* * print_results_cache: the cache results are stored in a file * @filename: file that stores the results * @bm_pid: child pid that runs benchmark * @llc_value: perf miss value / * llc occupancy value reported by resctrl FS * * Return: 0 on success, < 0 on error. */ static int print_results_cache(const char *filename, pid_t bm_pid, __u64 llc_value) { FILE *fp; if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) { printf("Pid: %d \t LLC_value: %llu\n", (int)bm_pid, llc_value); } else { fp = fopen(filename, "a"); if (!fp) { ksft_perror("Cannot open results file"); return -1; } fprintf(fp, "Pid: %d \t llc_value: %llu\n", (int)bm_pid, llc_value); fclose(fp); } return 0; } /* * perf_event_measure - Measure perf events * @filename: Filename for writing the results * @bm_pid: PID that runs the benchmark * * Measures perf events (e.g., cache misses) and writes the results into * @filename. @bm_pid is written to the results file along with the measured * value. * * Return: =0 on success. <0 on failure. */ int perf_event_measure(int pe_fd, struct perf_event_read *pe_read, const char *filename, pid_t bm_pid) { int ret; /* Stop counters after one span to get miss rate */ ret = ioctl(pe_fd, PERF_EVENT_IOC_DISABLE, 0); if (ret < 0) return ret; ret = read(pe_fd, pe_read, sizeof(*pe_read)); if (ret == -1) { ksft_perror("Could not get perf value"); return -1; } return print_results_cache(filename, bm_pid, pe_read->values[0].value); } /* * measure_llc_resctrl - Measure resctrl LLC value from resctrl * @filename: Filename for writing the results * @bm_pid: PID that runs the benchmark * * Measures LLC occupancy from resctrl and writes the results into @filename. * @bm_pid is written to the results file along with the measured value. * * Return: =0 on success. <0 on failure. */ int measure_llc_resctrl(const char *filename, pid_t bm_pid) { unsigned long llc_occu_resc = 0; int ret; ret = get_llc_occu_resctrl(&llc_occu_resc); if (ret < 0) return ret; return print_results_cache(filename, bm_pid, llc_occu_resc); } /* * show_cache_info - Show generic cache test information * @no_of_bits: Number of bits * @avg_llc_val: Average of LLC cache result data * @cache_span: Cache span * @lines: @cache_span in lines or bytes */ void show_cache_info(int no_of_bits, __u64 avg_llc_val, size_t cache_span, bool lines) { ksft_print_msg("Number of bits: %d\n", no_of_bits); ksft_print_msg("Average LLC val: %llu\n", avg_llc_val); ksft_print_msg("Cache span (%s): %zu\n", lines ? "lines" : "bytes", cache_span); }
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