linux-kernel - Re: start sorting out the ZONE

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Date:   Tue, 8 Feb 2022 11:03:32 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Christoph Hellwig <hch@....de>
CC:     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>, Jason Gunthorpe <jgg@...pe.ca>,
        Alistair Popple <apopple@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        <linux-kernel@...r.kernel.org>, <amd-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <nouveau@...ts.freedesktop.org>,
        <nvdimm@...ts.linux.dev>, <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: start sorting out the ZONE_DEVICE refcount mess

On 2022/2/7 14:32, Christoph Hellwig wrote:
> Hi all,
> 
> this series removes the offset by one refcount for ZONE_DEVICE pages
> that are freed back to the driver owning them, which is just device
> private ones for now, but also the planned device coherent pages
> and the ehanced p2p ones pending.
> 

Many thanks for doing this, I remember the hard time when I read the relevant code. :)

> It does not address the fsdax pages yet, which will be attacked in a
> follow on series.
> 
> Diffstat:
>  arch/arm64/mm/mmu.c                      |    1 
>  arch/powerpc/kvm/book3s_hv_uvmem.c       |    1 
>  drivers/gpu/drm/amd/amdkfd/kfd_migrate.c |    2 
>  drivers/gpu/drm/amd/amdkfd/kfd_priv.h    |    1 
>  drivers/gpu/drm/drm_cache.c              |    2 
>  drivers/gpu/drm/nouveau/nouveau_dmem.c   |    3 -
>  drivers/gpu/drm/nouveau/nouveau_svm.c    |    1 
>  drivers/infiniband/core/rw.c             |    1 
>  drivers/nvdimm/pmem.h                    |    1 
>  drivers/nvme/host/pci.c                  |    1 
>  drivers/nvme/target/io-cmd-bdev.c        |    1 
>  fs/Kconfig                               |    2 
>  fs/fuse/virtio_fs.c                      |    1 
>  include/linux/hmm.h                      |    9 ----
>  include/linux/memremap.h                 |   22 +++++++++-
>  include/linux/mm.h                       |   59 ++++-------------------------
>  lib/test_hmm.c                           |    4 +
>  mm/Kconfig                               |    4 -
>  mm/internal.h                            |    2 
>  mm/memcontrol.c                          |   11 +----
>  mm/memremap.c                            |   63 ++++++++++++++++---------------
>  mm/migrate.c                             |    6 --
>  mm/swap.c                                |   49 ++----------------------
>  23 files changed, 90 insertions(+), 157 deletions(-)
> 
> .
>