linux-kernel - Re: [PATCH] mm: remove unused alloc_pages_bulk

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Date:   Tue, 20 Dec 2022 09:56:19 -0800
From:   Yang Shi <shy828301@...il.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Lorenzo Stoakes <lstoakes@...il.com>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...il.com>,
        Ingo Molnar <mingo@...nel.org>, Marco Elver <elver@...gle.com>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm: remove unused alloc_pages_bulk_list()

On Mon, Dec 19, 2022 at 2:07 AM Mel Gorman <mgorman@...hsingularity.net> wrote:
>
> On Sat, Dec 17, 2022 at 08:34:58AM +0000, Lorenzo Stoakes wrote:
> > + Mel
> >
> > On Sat, Dec 17, 2022 at 04:56:03AM +0000, Matthew Wilcox wrote:
> > > I think we're waiting to see if any users show up.  It's only been 18
> > > months or so, so perhaps wait a little longer?
> >
> > Apologies, I should have researched the background of this further. I see it was
> > added speculatively in 0f87d9d30f.
> >
> > > Also, if we do get rid of this, then __alloc_pages_bulk() can lose
> > > the "list" argument.
> >
> > Ack. Will do a v2 if Mel feels it's appropriate to remove at this stage,
> > otherwise we can drop the idea and wait for users to emerge.
>
> I reckon we should give it another few months until May. There has been
> one user recently that tried to use list but it turned out arrays were
> more appropriate.

Another recent try was the patches for dm-crypt. However Mel suggested
adding a callback interface instead of using list since list is not
necessary for that usecase. Or are we talking about the same one?

I didn't get time to implement Mel's suggestion yet due to my
employment change. Hopefully I can find some time after the new year.

>
> --
> Mel Gorman
> SUSE Labs
>