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From: Ralph Campbell <rcampbell@nvidia.com>
To: Alex Sierra <alex.sierra@amd.com>, <akpm@linux-foundation.org>,
	<Felix.Kuehling@amd.com>, <linux-mm@kvack.org>,
	<linux-ext4@vger.kernel.org>, <linux-xfs@vger.kernel.org>
Cc: <amd-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>, <hch@lst.de>, <jgg@nvidia.com>,
	<jglisse@redhat.com>
Subject: Re: [PATCH v2 02/12] mm: remove extra ZONE_DEVICE struct page refcount
Date: Tue, 14 Sep 2021 22:32:37 -0700	[thread overview]
Message-ID: <66933a59-9761-7f03-80af-4843c9210212@nvidia.com> (raw)
In-Reply-To: <20210913161604.31981-3-alex.sierra@amd.com>

On 9/13/21 9:15 AM, Alex Sierra wrote:
> From: Ralph Campbell <rcampbell@nvidia.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.
>
> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
> Signed-off-by: Alex Sierra <alex.sierra@amd.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---
> v2:
> AS: merged this patch in linux 5.11 version
>
> v5:
> AS: add condition at try_grab_page to check for the zone device type, while
> page ref counter is checked less/equal to zero. In case of device zone, pages
> ref counter are initialized to zero.
>
> v7:
> AS: fix condition at try_grab_page added at v5, is invalid. It supposed
> to fix xfstests/generic/413 test, however, there's a known issue on
> this test where DAX mapped area DIO to non-DAX expect to fail.
> https://patchwork.kernel.org/project/fstests/patch/1489463960-3579-1-git-send-email-xzhou@redhat.com
> This condition was removed after rebase over patch series
> https://lore.kernel.org/r/20210813044133.1536842-4-jhubbard@nvidia.com
> ---
>   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                     | 11 ----
>   lib/test_hmm.c                         |  2 +-
>   mm/internal.h                          |  8 +++
>   mm/memremap.c                          | 69 +++++++-------------------
>   mm/migrate.c                           |  5 --
>   mm/page_alloc.c                        |  3 ++
>   mm/swap.c                              | 45 ++---------------
>   12 files changed, 45 insertions(+), 115 deletions(-)
>
I don't see mm/memcontrol.c listed here so I think you will need this fragment too:

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 389b5766e74f..0cc9c7c71e79 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5541,11 +5541,7 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
  	 */
  	if (is_device_private_entry(ent)) {
  		page = pfn_swap_entry_to_page(ent);
-		/*
-		 * MEMORY_DEVICE_PRIVATE means ZONE_DEVICE page and which have
-		 * a refcount of 1 when free (unlike normal page)
-		 */
-		if (!page_ref_add_unless(page, 1, 1))
+		if (!get_page_unless_zero(page))
  			return NULL;
  		return page;
  	}



  reply	other threads:[~2021-09-15  5:32 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 16:15 [PATCH v2 00/12] MEMORY_DEVICE_PUBLIC for CPU-accessible coherent device memory Alex Sierra
2021-09-13 16:15 ` [PATCH v2 01/12] ext4/xfs: add page refcount helper Alex Sierra
2021-09-13 16:15 ` [PATCH v2 02/12] mm: remove extra ZONE_DEVICE struct page refcount Alex Sierra
2021-09-15  5:32   ` Ralph Campbell [this message]
2021-09-15  5:32     ` Ralph Campbell
2021-09-13 16:15 ` [PATCH v2 03/12] mm: add zone device public type memory support Alex Sierra
2021-09-13 16:15 ` [PATCH v2 04/12] mm: add device public vma selection for memory migration Alex Sierra
2021-09-13 16:15 ` [PATCH v2 05/12] drm/amdkfd: ref count init for device pages Alex Sierra
2021-09-13 16:15 ` [PATCH v2 06/12] drm/amdkfd: add SPM support for SVM Alex Sierra
2021-09-13 16:15 ` [PATCH v2 07/12] drm/amdkfd: public type as sys mem on migration to ram Alex Sierra
2021-09-13 16:16 ` [PATCH v2 08/12] lib: test_hmm add ioctl to get zone device type Alex Sierra
2021-09-13 16:16 ` [PATCH v2 09/12] lib: test_hmm add module param for " Alex Sierra
2021-09-20  8:53   ` Alistair Popple
2021-09-20 20:05     ` Sierra Guiza, Alejandro (Alex)
2021-09-21  5:14       ` Alistair Popple
2021-09-23 15:52         ` Sierra Guiza, Alejandro (Alex)
2021-10-01  0:28           ` Alistair Popple
2021-09-13 16:16 ` [PATCH v2 10/12] lib: add support for device public type in test_hmm Alex Sierra
2021-10-01  1:32   ` Alistair Popple
2021-09-13 16:16 ` [PATCH v2 11/12] tools: update hmm-test to support device public type Alex Sierra
2021-09-13 16:16 ` [PATCH v2 12/12] tools: update test_hmm script to support SP config Alex Sierra

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