如何使用perf_event_open()测量dtlb命中和dtlb未命中？

#include <linux/perf_event.h>
#include <unistd.h>
#include #include <stdio.h>
#include <stdlib.h>

struct perf_event_attr pe;
int fd;

memset(&pe, 0, sizeof(struct perf_event_attr));
pe.type = PERF_TYPE_HARDWARE;
pe.size = sizeof(struct perf_event_attr);
pe.config = PERF_COUNT_HW_CACHE_DTLB | (PERF_COUNT_HW_CACHE_OP_READ << 8) | (PERF_COUNT_HW_CACHE_RESULT_MISS << 16);
pe.disabled = 1;
pe.exclude_kernel = 1;
pe.exclude_hv = 1;

fd = syscall(__NR_perf_event_open, &pe, 0, -1, -1, 0);
if (fd == -1) {
    fprintf(stderr, "Error opening leader %llx\n", pe.config);
    exit(EXIT_FAILURE);
}

ioctl(fd, PERF_EVENT_IOC_RESET, 0);
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);

// 这里写需要测量的代码

ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
read(fd, &count, sizeof(long long));
printf("dtlb未命中次数：%lld\n", count);