linux-kernel - Re: [PATCH 7/8] mm: remove the extra ZONE

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Date:   Wed, 9 Feb 2022 10:14:27 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>,
        Alistair Popple <apopple@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, nouveau@...ts.freedesktop.org,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 7/8] mm: remove the extra ZONE_DEVICE struct page refcount

On Wed, Feb 09, 2022 at 02:53:51PM +0100, Christoph Hellwig wrote:
> On Wed, Feb 09, 2022 at 08:29:56AM -0400, Jason Gunthorpe wrote:
> > It is nice, but the other series are still impacted by the fsdax mess
> > - they still stuff pages into ptes without proper refcounts and have
> > to carry nonsense to dance around this problem.
> > 
> > I certainly would be unhappy if the amd driver, for instance, gained
> > the fsdax problem as well and started pushing 4k pages into PMDs.
> 
> As said before: I think this all needs to be fixed.  But I'd rather
> fix it gradually and I think this series is a nice step forward.
> After that we can look at the pte mappings.

Right, I agree with this

Jason