linux-ext4 - Re: [PATCH v1 2/2] mm: remove extra ZONE

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Date:   Sun, 17 Oct 2021 11:20:53 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jason Gunthorpe <jgg@...dia.com>,
        Alex Sierra <alex.sierra@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        Linux MM <linux-mm@...ck.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Alistair Popple <apopple@...dia.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>
Subject: Re: [PATCH v1 2/2] mm: remove extra ZONE_DEVICE struct page refcount

On Sat, Oct 16, 2021 at 9:39 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Sat, Oct 16, 2021 at 12:44:50PM -0300, Jason Gunthorpe wrote:
> > Assuming changing FSDAX is hard.. How would DAX people feel about just
> > deleting the PUD/PMD support until it can be done with compound pages?
>
> I think there are customers who would find that an unacceptable answer :-)

No, not given the number of end users that ask for help debugging PMD support.