linux-kernel - Re: [RFC][PATCH 1/4] mm, page_owner: add folio allocate post callback for struct page

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Date:   Thu, 09 Nov 2023 16:04:39 +0000
From:   jeff.xie@...ux.dev
To:     "Matthew Wilcox" <willy@...radead.org>,
        "Jeff Xie" <xiehuan09@...il.com>
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
Subject: Re: [RFC][PATCH 1/4] mm, page_owner: add folio allocate post callback
 for struct page_owner to make the owner clearer

November 9, 2023 at 11:36 PM, "Matthew Wilcox" <willy@...radead.org> wrote:


> 
> On Thu, Nov 09, 2023 at 11:25:18PM +0800, Jeff Xie wrote:
> 
> > 
> > From the perspective of a folio, it cannot obtain information about
> >  all the situations in which folios are allocated.
> >  If we want to determine whether a folio is related to vmalloc or
> >  kernel_stack or the other memory allocation process,
> >  using just a folio parameter is not sufficient. To achieve this goal,
> >  we can add a callback function to provide more extensibility and
> >  information.
> > 
> 
> But we want that anyway (or at least I do). You're right that vmalloc
> pages are not marked as being vmalloc pages and don't contain the
> information about which vmalloc area they belong to. I've talked about
> ways we can add that information to folios in the past, but I have a lot
> of other projects I'm working on. Are you interested in doing that?
>

Certainly, I'm willing to give it a try. If a folio can include vmalloc information
or more information, this is great. I may need to understand the background of why
you proposed this method in the past.

--
Jeff Xie