Retrieve the virtual page id from a virtual address

Question

We know this following function from Linux kernel, which takes a pointer to the struct page and outputs the virtual address of the page frame:

void * page_address(struct page *page)

So I wonder if a function in a reserved version is available: taking a virtual memory address and outputting the corresponding virtual page id? (The output should not be a struct page in-memory data structure because of the assumption, that a page could be swapped to the disk.)

Thanks. Correct me, if I am wrong or have a duplicated question over SO.

gerhard d. · Accepted Answer · 2022-02-21 12:43:13Z

After reading several virtual address translation post, I found the virtual page number is an intermediate result in the translation and is mentioned in those posts.

Here is an example: https://stackoverflow.com/a/45128487/10971650.

What's relevant here is the variable vpn for the virtual page number. (I use the function getpagesize instead.)

#include <unistd.h> #include <stdint.h> uintptr_t get_virtual_page_number (uintptr_t vaddr) { return vaddr / getpagesize(); }

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