linux-kernel - Re: [RFC][PATCH 4/4] mm/rmap: implement anonmap allocate post callback for page

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Date:   Thu, 09 Nov 2023 15:47:48 +0000
From:   jeff.xie@...ux.dev
To:     "Matthew Wilcox" <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, iamjoonsoo.kim@....com, vbabka@...e.cz,
        cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        roman.gushchin@...ux.dev, 42.hyeyoo@...il.com, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        chensong_2000@....cn, xiehuan09@...il.com
Subject: Re: [RFC][PATCH 4/4] mm/rmap: implement anonmap allocate post
 callback for page_owner

November 9, 2023 at 10:10 PM, "Matthew Wilcox" <willy@...radead.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