linux-kernel - Re: Removing page->index

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Message-ID: <20241210130420.534a6512@p-imbrenda>
Date: Tue, 10 Dec 2024 13:04:20 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-s390@...r.kernel.org
Subject: Re: Removing page->index

On Tue, 10 Dec 2024 12:05:25 +0100
David Hildenbrand <david@...hat.com> wrote:

> On 09.12.24 18:36, Claudio Imbrenda wrote:
> > On Wed, 4 Dec 2024 16:58:52 +0100
> > David Hildenbrand <david@...hat.com> wrote:

[...]

> >> I know that Claudio is working on some changes, but not sure how that
> >> would affect gmap's usage of page->index.  
> > 
> > After I'm done, we won't use page->index anymore.
> > 
> > The changes I'm working on are massive, it's very impractical to push
> > everything at once, so I'm refactoring and splitting smaller and more
> > manageable (and reviewable) series.
> > 
> > This means that it will take some time before I'm done (I'm *hoping*
> > to be done for 6.15)  
> 
> Thanks for the information. So for the time being, we could likely 
> switch to page->private.
> 
> One question may be whether these (not-user-space) page tables should at 
> some point deserve a dedicated memdesc. But likely the question is what 

maybe? but given that everything is changing all the time, I'm avoiding
any magic logic in struct page / struct folio.

> it will all look like after your rework.

but now that you put my attention on it, I'll try to get rid of
page->index rather sooner than later.