此评论是从linux源代码中的mm_types.h文件中复制的：
/*
...
* Each physical page in the system has a struct page associated with
* it to keep track of whatever it is we are using the page for at the
* moment. Note that we have no way to track which tasks are using
* a page, though if it is a pagecache page, rmap structures can tell us
* who is mapping it.
...
*/
所以，我的问题是如何在评论中找到引用或映射特定物理页面的进程？那些可以做到这一点的功能是什么？
谢谢大家。