问使用move_pages()移动拥抱？

EN

#include <cstdint>
#include <iostream>
#include <numaif.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <limits>

int main(int argc, char** argv) {
        const int32_t dst_node = strtoul(argv[1], nullptr, 10);
        const constexpr uint64_t size = 4lu * 1024 * 1024;
        const constexpr uint64_t pageSize = 2lu * 1024 * 1024;
        const constexpr uint32_t nPages = size / pageSize;
        int32_t status[nPages];
        std::fill_n(status, nPages, std::numeric_limits<int32_t>::min());;
        void* pages[nPages];
        int32_t dst_nodes[nPages];
        void* ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_HUGETLB, -1, 0);

        if (ptr == MAP_FAILED) {
                throw "failed to map hugepages";
        }
        memset(ptr, 0x41, nPages*pageSize);
        for (uint32_t i = 0; i < nPages; i++) {
                pages[i] = &((char*)ptr)[i*pageSize];
                dst_nodes[i] = dst_node;
        }

        std::cout << "Before moving" << std::endl;

        if (0 != move_pages(0, nPages, pages, nullptr, status, 0)) {
            std::cout << "failed to inquiry pages because " << strerror(errno) << std::endl;
        }
        else {
                for (uint32_t i = 0; i < nPages; i++) {
                        std::cout << "page # " << i << " locates at numa node " << status[i] << std::endl;
                }
        }

        // real move
        if (0 != move_pages(0, nPages, pages, dst_nodes, status, MPOL_MF_MOVE_ALL)) {
                std::cout << "failed to move pages because " << strerror(errno) << std::endl;
                exit(-1);
        }

        const constexpr uint64_t smallPageSize = 4lu * 1024;
        const constexpr uint32_t nSmallPages = size / smallPageSize;
        void* smallPages[nSmallPages];
        int32_t smallStatus[nSmallPages] = {std::numeric_limits<int32_t>::min()};
        for (uint32_t i = 0; i < nSmallPages; i++) {
                smallPages[i] = &((char*)ptr)[i*smallPageSize];
        }


        std::cout << "after moving" << std::endl;
        if (0 != move_pages(0, nSmallPages, smallPages, nullptr, smallStatus, 0)) {
            std::cout << "failed to inquiry pages because " << strerror(errno) << std::endl;
        }
        else {
                for (uint32_t i = 0; i < nSmallPages; i++) {
                        std::cout << "page # " << i << " locates at numa node " << smallStatus[i] << std::endl;
                }
        }

}