linux-kernel - Re: [PATCH v5 02/24] mm: remove extra ZONE

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Message-ID: <90168b70-cd15-9eb8-b782-9200b174a046@nvidia.com>
Date:   Fri, 28 Jan 2022 09:16:25 -0800
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jakowski Andrzej <andrzej.jakowski@...el.com>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
        Alex Sierra <alex.sierra@....com>
Subject: Re: [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page
 refcount


On 1/28/22 06:21, Jason Gunthorpe wrote:
> On Thu, Jan 27, 2022 at 05:25:52PM -0700, Logan Gunthorpe wrote:
>> From: Ralph Campbell <rcampbell@...dia.com>
>>
>> ZONE_DEVICE struct pages have an extra reference count that complicates the
>> code for put_page() and several places in the kernel that need to check the
>> reference count to see that a page is not being used (gup, compaction,
>> migration, etc.). Clean up the code so the reference count doesn't need to
>> be treated specially for ZONE_DEVICE.
>>
>> [logang: dropped no longer used section from mm.h including
>>   page_is_devmap_managed, rebased on v5.17-rc1 (possibly poorly)]
>> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
>> Signed-off-by: Alex Sierra <alex.sierra@....com>
>> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
>> Reviewed-by: Christoph Hellwig <hch@....de>
>> ---
>>   arch/powerpc/kvm/book3s_hv_uvmem.c     |  2 +-
>>   drivers/gpu/drm/nouveau/nouveau_dmem.c |  2 +-
>>   fs/dax.c                               |  4 +-
>>   include/linux/dax.h                    |  2 +-
>>   include/linux/memremap.h               |  7 +--
>>   include/linux/mm.h                     | 44 ----------------
>>   lib/test_hmm.c                         |  2 +-
>>   mm/internal.h                          |  8 +++
>>   mm/memcontrol.c                        |  6 +--
>>   mm/memremap.c                          | 70 +++++++-------------------
>>   mm/migrate.c                           |  5 --
>>   mm/page_alloc.c                        |  3 ++
>>   mm/swap.c                              | 45 ++---------------
>>   13 files changed, 46 insertions(+), 154 deletions(-)
> This patch still can't be applied until the FSDAX issues are solved,
> right? See my remarks the last time it was posted..
>
> Jason

That is my understanding too.