some syscall benchmark

int do_syscall_read_long(void *args)
{
    FILE *f = args;
    int i;
    long val;

    for (i = 0; i < (PAGE_SIZE / sizeof(val)); i++) {
        val = 0;
        int ret = read(f->_fileno, &val, sizeof(val));
        assert(ret == sizeof(val));
        assert(val != 0);
    }
    fseek(f, 0, SEEK_SET);
    return 0;
}

int main(int argc, char **argv) {

    void *mmap_addr = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
    memset(mmap_addr, 0xCA, PAGE_SIZE);

    FILE *f = fopen("iofile.data", "w+");
    if (f == NULL) {
        printf("open error\n");
        return -1;
    }
    int ret = fwrite(mmap_addr, sizeof(char), PAGE_SIZE, f);
    printf("fwrite=%d\n", ret);
    fseek(f, 0, SEEK_SET);
    fflush(f);

    struct profile prof[] = {
        {
            .name = "do_mmap_read_long",
            .func = do_mmap_read_long,
            .repeat = 1000000,
            .args = mmap_addr,
        },
/*
        {
            .name = "do_mmap_read_int",
            .func = do_mmap_read_int,
            .repeat = 1000000,
            .args = mmap_addr,
        },
        {
            .name = "do_mmap_read_byte",
            .func = do_mmap_read_byte,
            .repeat = 1000000,
            .args = mmap_addr,
        },
*/
        {
            .name = "do_syscall_read_long",
            .func = do_syscall_read_long,
            .repeat = 10000,
            .args = f,
        },
        { .name = NULL },
    };
    struct profile *curr;
    for (curr = prof; curr->name != NULL; curr++) {
        profile_combo(curr);
        profile_stats_print(curr, stdout);
    }
    return 0;
}