I really appreciate it! Sent from my iPhone > On Apr 5, 2021, at 11:39 PM, Wonkyo Choe <heysid3@xxxxxxxxx> wrote: > > Hello there, > > I'm trying to manage a custom page table list for my toy project. > A basic process of the custom list is to allocate few pages (struct page) > to the list from the buddy allocator and the list will give some pages > when a user process needs page table pages. In contrast, when this > process terminates, > page table pages will return to the list. Finally, when the list is > not needed, all pages will be > delivered to the buddy allocator. > > This relationship can be described as: > process - custom list - buddy allocator > > My problem is that a user process' page table pages (pud, pmd, pte) > seem to free their > page to the buddy allocator instead of to the custom list. (allocation > works. I've checked it) > I put my custom functions in release_pages / free_unref_page / > free_unref_page_list, > but somehow the functions do not work as I intended. (Actually the > functions are not > called so I may choose the wrong functions.) > > So, I was wondering whether I intercepted the right functions (three > functions above). > Also, I have a question about freeing a page-table page. > > 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? > I'm trying to find freeing functions, but I can't find them and I'm > not sure when this kind of function is called. > (I'm pretty sure that pte_free / pmd_free / pud_free functions are not > for this case.) > > Any help would be greatly appreciated. > > Regards, > Wonkyo > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
