unexpected minflt(minor page fault) - c++

Question

minor page fault means:need virtual memory map real memory, but I found my test code has some min page fault when access used memory .
my test code :
#include <iostream>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
using namespace std;
int main() {
uint64_t len = 1024ll * 128; //128k
uint32_t times = 1000000000;
char *p = new char[len];
for (uint32_t t = 0; t < times; ++t) {
for (uint64_t i = 0; i < len; ++i) {
*(p + i) = 100;
}
}
delete[] p;
return 0;
}
pidstat:
03:40:05 PM UID PID minflt/s majflt/s VSZ RSS %MEM Command
03:40:06 PM 0 42379 34.00 0.00 12672 1196 0.00 main
03:40:07 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:08 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:09 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:10 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:11 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:12 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:13 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:14 PM 0 42379 34.00 0.00 12672 1196 0.00 main
03:40:15 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:16 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:17 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:18 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:19 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:20 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:21 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:22 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:23 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:24 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:25 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:26 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:27 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:28 PM 0 42379 34.00 0.00 12672 1196 0.00 main
03:40:29 PM 0 42379 0.00 0.00 12672 1196 0.00 main
03:40:30 PM 0 42379 0.00 0.00 12672 1196 0.00 main
minflt/s:34 = 34 * 4K = 136K
my array in test code = 128K
Why dost my test code product minflt when access used memory?