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

[jeff . xie]

November 9, 2023 at 10:10 PM, "Matthew Wilcox" <willy@xxxxxxxxxxxxx> 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