Valgrind告诉我在堆上分配了多少字节？

Question

   int main(){
    int *pointer = malloc(5);
    free(pointer);
    return 0;
}


 ==44611== 
==44611== HEAP SUMMARY:
==44611==     in use at exit: 22,223 bytes in 183 blocks
==44611==   total heap usage: 259 allocs, 76 frees, 28,335 bytes allocated
==44611== 
==44611== LEAK SUMMARY:
==44611==    definitely lost: 0 bytes in 0 blocks
==44611==    indirectly lost: 0 bytes in 0 blocks
==44611==      possibly lost: 0 bytes in 0 blocks
==44611==    still reachable: 0 bytes in 0 blocks
==44611==         suppressed: 22,223 bytes in 183 blocks
==44611== 

从代码中可以看出，似乎有一些我没有完成的分配和释放以及已分配的大量字节？这些字节现在是否被计算机无法使用，因为当我开始用C编程时我忘了释放它们？ 抑制意味着什么呢？ 并帮助解决这个问题。谢谢