Re: [RFC][PATCH 4/4] mm/rmap: implement anonmap allocate post callback for page_owner

jeff.xie
2023-11-09T16:03:57Z

November 9, 2023 at 10:10 PM, "Matthew Wilcox" <willy@infradead.org> wrote:

>
> On Thu, Nov 09, 2023 at 11:25:21AM +0800, Jeff Xie wrote:
>
> >
> > +static int anon_alloc_post_page_owner(struct folio *folio, struct task_struct *tsk,
> > + void *data, char *kbuf, size_t count)
> > +{
> > + int ret;
> > + unsigned long address = (unsigned long)data;
> > +
> > + ret = scnprintf(kbuf, count, "ANON_PAGE address 0x%lx\n", address);
> >
>
> ... completely ignoring that it might have been mremap() since ...
>
> I'm not an expert on anon memory. I'm sure someone can tell you how to
> figure out the current address that a folio is mapped at.
>

I'm currently not sure if the address parameter is the mapped address, so this is an RFC patchset ;-)

__
Jeff Xie