From: David Hildenbrand <david@redhat.com>
To: Alistair Popple <apopple@nvidia.com>, linux-mm@kvack.org
Cc: david@fromorbit.com, dan.j.williams@intel.com,
jhubbard@nvidia.com, rcampbell@nvidia.com, willy@infradead.org,
jgg@nvidia.com, linux-fsdevel@vger.kernel.org, jack@suse.cz,
djwong@kernel.org, hch@lst.de, ruansy.fnst@fujitsu.com,
nvdimm@lists.linux.dev, linux-xfs@vger.kernel.org,
linux-ext4@vger.kernel.org, jglisse@redhat.com
Subject: Re: [RFC 09/10] mm/khugepage.c: Warn if trying to scan devmap pmd
Date: Thu, 11 Apr 2024 15:45:57 +0200 [thread overview]
Message-ID: <ce3ea542-9b68-4630-b437-c9daddad2e83@redhat.com> (raw)
In-Reply-To: <68427031c58645ba4b751022bf032ffd6b247427.1712796818.git-series.apopple@nvidia.com>
On 11.04.24 02:57, Alistair Popple wrote:
> The only user of devmap PTEs is FS DAX, and khugepaged should not be
> scanning these VMAs. This is checked by calling
> hugepage_vma_check. Therefore khugepaged should never encounter a
> devmap PTE. Warn if this occurs.
>
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
>
> ---
>
> Note this is a transitory patch to test the above assumption both at
> runtime and during review. I will likely remove it as the whole thing
> gets deleted when pXX_devmap is removed.
Yes, doesn't make sense for this patch to exist if it would go upstream
along with the next patch that removes that completely.
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2024-04-11 13:46 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-11 0:57 [RFC 00/10] fs/dax: Fix FS DAX page reference counts Alistair Popple
2024-04-11 0:57 ` [RFC 01/10] mm/gup.c: Remove redundant check for PCI P2PDMA page Alistair Popple
2024-04-11 12:59 ` Jason Gunthorpe
2024-04-11 13:47 ` David Hildenbrand
2024-04-12 1:37 ` Alistair Popple
2024-04-11 0:57 ` [RFC 02/10] mm/hmm: Remove dead check for HugeTLB and FS DAX Alistair Popple
2024-04-11 12:25 ` Jason Gunthorpe
2024-04-11 13:37 ` Peter Xu
2024-04-12 1:28 ` Alistair Popple
2024-04-11 0:57 ` [RFC 03/10] pci/p2pdma: Don't initialise page refcount to one Alistair Popple
2024-04-11 12:29 ` Jason Gunthorpe
2024-04-12 5:40 ` Alistair Popple
2024-04-12 17:20 ` Dan Williams
2024-05-09 21:59 ` Logan Gunthorpe
2024-05-09 23:14 ` Alistair Popple
2024-04-11 0:57 ` [RFC 04/10] fs/dax: Don't track page mapping/index Alistair Popple
2024-04-12 15:22 ` Jan Kara
2024-04-12 17:31 ` Dan Williams
2024-04-15 7:03 ` Alistair Popple
2024-04-15 20:51 ` Dan Williams
2024-04-16 0:07 ` Alistair Popple
2024-04-16 0:36 ` Dan Williams
2024-04-12 17:21 ` Dan Williams
2024-04-11 0:57 ` [RFC 05/10] fs/dax: Refactor wait for dax idle page Alistair Popple
2024-04-12 14:37 ` Jan Kara
2024-04-13 20:19 ` John Hubbard
2024-04-15 8:41 ` Alistair Popple
2024-04-11 0:57 ` [RFC 06/10] fs/dax: Add dax_page_free callback Alistair Popple
2024-04-11 0:57 ` [RFC 07/10] mm: Allow compound zone device pages Alistair Popple
2024-04-11 12:32 ` Jason Gunthorpe
2024-04-11 14:10 ` Matthew Wilcox
2024-04-12 1:38 ` Alistair Popple
2024-04-11 0:57 ` [RFC 08/10] fs/dax: Properly refcount fs dax pages Alistair Popple
2024-04-11 0:57 ` [RFC 09/10] mm/khugepage.c: Warn if trying to scan devmap pmd Alistair Popple
2024-04-11 13:45 ` David Hildenbrand [this message]
2024-04-12 1:34 ` Alistair Popple
2024-04-11 0:57 ` [RFC 10/10] mm: Remove pXX_devmap Alistair Popple
2024-04-11 12:57 ` Jason Gunthorpe
2024-04-11 17:28 ` [RFC 00/10] fs/dax: Fix FS DAX page reference counts Dan Williams
2024-04-11 17:35 ` Jason Gunthorpe
2024-04-11 17:56 ` Dan Williams
2024-04-12 3:54 ` Alistair Popple
2024-04-12 6:55 ` Alistair Popple
2024-04-12 11:53 ` Jason Gunthorpe
2024-04-12 17:32 ` Dan Williams
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