内存无法释放std :: list <std :: shared_ptr <std :: string >> C ++

我正在填充字符串共享指针的列表。在程序的某个时刻，我清除了列表。但是，即使我调用clear()list函数，程序的内存消耗也不会减少。知道为什么吗？

#include <memory>
#include <string>
#include <list>
#include <iostream>

int main()
{
    std::string text = "                                                            \
        PREFACE                                                                     \
                                                                                    \
        Most of the adventures recorded in this book really occurred; one or two    \
        were experiences of my own, the rest those of boys who were schoolmates     \
        of mine. Huck Finn is drawn from life; Tom Sawyer also, but not from an     \
        individual--he is a combination of the characteristics of three boys whom   \
        I knew, and therefore belongs to the composite order of architecture.       \
                                                                                    \
        The odd superstitions touched upon were all prevalent among children and    \
        slaves in the West at the period of this story--that is to say, thirty or   \
        forty years ago.                                                            \
                                                                                    \
        Although my book is intended mainly for the entertainment of boys and       \
        girls, I hope it will not be shunned by men and women on that account,      \
        for part of my plan has been to try to pleasantly remind adults of what     \
        they once were themselves, and of how they felt and thought and talked,     \
        and what queer enterprises they sometimes engaged in.                       \
    ";

    std::list<std::shared_ptr<std::string>> data;
    for (auto i = 0u; i < 999999; ++i) {
        data.push_back(std::make_shared<std::string>(text));
    }

    std::cout << "Data loaded. Press any key to continue...";
    std::cin.get();

    data.clear(); // memory does not reduce
    std::cout << "Data unloaded. Press any key to continue...";
    std::cin.get();

    std::cout << "Container size:" << data.size() << std::endl;
    std::cout << "Press any key to exit...";
    std::cin.get();

    return 0;
}

我正在WSL上调试。我使用了Linux top（在WSL上）和Windows Task Manager来检查每次停止时的内存使用情况。但是valgrind不会报告任何内存泄漏。

PS：请不要问为什么我使用共享指针。提出不同的方法将很有用，但此问题的主要目的是理解这种行为。因为即使cppref也无法解释这一点。欣赏是否有人可以解释这种行为而不是解决它。

我不需要修复。我需要一个解释。