How to free a page table page

[Rik van Riel]

On Tue, 2021-04-06 at 00:39 +0900, Wonkyo Choe wrote:

> 1. In x86, are all page-table pages released at the end of
> termination
> by using free_pgtables()?
> 2. In x86, a page-table page can be freed when there is no entry? In
> other words, does the Linux kernel
> release a page-table page on runtime? If so, what function would do
> this kind of task?

At munmap time, as well as exit and execve time, page
tables can get freed. Look at the code between sys_munmap()
and zap_page_range().

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