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#include "../source/uapi/monitor_user.h"
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#define HUGEPAGE_SIZE (1024 * 1024 * 1024) // Huge Page 大小为 1GB
int main() {
int fd;
void *addr;
watch_arg w_arg = {0};
// 打开一个 hugetlbfs 文件
fd = open("/run/mrzcpd/huge_pages/hugepagefile", O_CREAT | O_RDWR, 0755);
if (fd < 0) {
perror("open");
return 1;
}
// 映射 Huge Page 内存
addr = mmap(0, HUGEPAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) {
perror("mmap");
close(fd);
return 1;
}
// 大页内存 int 类型变量, for ++
int *p = (int *)addr;
*p = 0;
w_arg = (watch_arg){
.task_id = getpid(),
.ptr = p,
.name = "hptest",
.length_byte = sizeof(int),
.threshold = 20,
.is_unsigned = 0,
.above_threshold = 1,
.time_ns = 2000, // on hyper-v, 1us will block all system. 2us just fine, maybe 1us is too short for hyper-v
};
start_watch(w_arg);
for (int i = 0; i < 100; i++)
{
(*p)++;
printf("p = %d\n", *p);
sleep(1);
}
// 释放 Huge Page 内存
if (munmap(addr, HUGEPAGE_SIZE) == -1) {
perror("munmap");
close(fd);
return 1;
}
close(fd);
return 0;
}
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