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From: John Hubbard <jhubbard@nvidia.com>
To: Dan Williams <dan.j.williams@intel.com>, Jan Kara <jack@suse.cz>
Cc: "Leon Romanovsky" <leon@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Alex Williamson" <alex.williamson@redhat.com>,
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	"Maor Gottlieb" <maorg@mellanox.com>
Subject: Re: [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN
Date: Fri, 20 Dec 2019 16:41:35 -0800	[thread overview]
Message-ID: <437f2bff-13ba-0ae9-2f3c-bc8eb82d20f0@nvidia.com> (raw)
In-Reply-To: <CAPcyv4gYnXE-y_aGehazzF-Kej5ibSfqvE2hTnjKJD68bm8ANg@mail.gmail.com>

On 12/20/19 4:33 PM, Dan Williams wrote:
...
>> I believe there might be also a different solution for this: For
>> transparent huge pages, we could find a space in 'struct page' of the
>> second page in the huge page for proper pin counter and just account pins
>> there so we'd have full width of 32-bits for it.
> 
> That would require THP accounting for dax pages. It is something that
> was probably going to be needed, but this would seem to force the
> issue.
> 

Thanks for mentioning that, it wasn't obvious to me yet. 

How easy is it for mere mortals outside of Intel, to set up a DAX (nvdimm?)
test setup? I'd hate to go into this without having that coverage up
and running. It's been sketchy enough as it is. :)

thanks,
-- 
John Hubbard
NVIDIA

  reply	other threads:[~2019-12-21  0:41 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-16 22:25 [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN John Hubbard
2019-12-16 22:25 ` [PATCH v11 01/25] mm/gup: factor out duplicate code from four routines John Hubbard
2019-12-18 15:52   ` Kirill A. Shutemov
2019-12-18 22:15     ` John Hubbard
2019-12-18 22:45       ` Kirill A. Shutemov
2019-12-16 22:25 ` [PATCH v11 02/25] mm/gup: move try_get_compound_head() to top, fix minor issues John Hubbard
2019-12-16 22:25 ` [PATCH v11 03/25] mm: Cleanup __put_devmap_managed_page() vs ->page_free() John Hubbard
2019-12-16 22:25 ` [PATCH v11 04/25] mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages John Hubbard
2019-12-18 16:04   ` Kirill A. Shutemov
2019-12-19  0:32     ` John Hubbard
2019-12-19  0:40     ` [PATCH v12] " John Hubbard
2019-12-19  5:27   ` [PATCH v11 04/25] " Dan Williams
2019-12-19  5:48     ` John Hubbard
2019-12-19  6:52       ` Dan Williams
2019-12-19  7:33         ` John Hubbard
2019-12-16 22:25 ` [PATCH v11 05/25] goldish_pipe: rename local pin_user_pages() routine John Hubbard
2019-12-16 22:25 ` [PATCH v11 06/25] mm: fix get_user_pages_remote()'s handling of FOLL_LONGTERM John Hubbard
2019-12-18 16:19   ` Kirill A. Shutemov
2019-12-18 22:15     ` John Hubbard
2019-12-16 22:25 ` [PATCH v11 07/25] vfio: fix FOLL_LONGTERM use, simplify get_user_pages_remote() call John Hubbard
2019-12-16 22:25 ` [PATCH v11 08/25] mm/gup: allow FOLL_FORCE for get_user_pages_fast() John Hubbard
2019-12-16 22:25 ` [PATCH v11 09/25] IB/umem: use get_user_pages_fast() to pin DMA pages John Hubbard
2019-12-16 22:25 ` [PATCH v11 10/25] mm/gup: introduce pin_user_pages*() and FOLL_PIN John Hubbard
2019-12-16 22:25 ` [PATCH v11 11/25] goldish_pipe: convert to pin_user_pages() and put_user_page() John Hubbard
2019-12-16 22:25 ` [PATCH v11 12/25] IB/{core,hw,umem}: set FOLL_PIN via pin_user_pages*(), fix up ODP John Hubbard
2019-12-16 22:25 ` [PATCH v11 13/25] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote() John Hubbard
2019-12-16 22:25 ` [PATCH v11 14/25] drm/via: set FOLL_PIN via pin_user_pages_fast() John Hubbard
2019-12-16 22:25 ` [PATCH v11 15/25] fs/io_uring: set FOLL_PIN via pin_user_pages() John Hubbard
2019-12-16 22:25 ` [PATCH v11 16/25] net/xdp: " John Hubbard
2019-12-16 22:25 ` [PATCH v11 17/25] media/v4l2-core: set pages dirty upon releasing DMA buffers John Hubbard
2019-12-16 22:25 ` [PATCH v11 18/25] media/v4l2-core: pin_user_pages (FOLL_PIN) and put_user_page() conversion John Hubbard
2019-12-16 22:25 ` [PATCH v11 19/25] vfio, mm: " John Hubbard
2019-12-16 22:25 ` [PATCH v11 20/25] powerpc: book3s64: convert to pin_user_pages() and put_user_page() John Hubbard
2019-12-16 22:25 ` [PATCH v11 21/25] mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1" John Hubbard
2019-12-16 22:25 ` [PATCH v11 22/25] mm, tree-wide: rename put_user_page*() to unpin_user_page*() John Hubbard
2019-12-16 22:25 ` [PATCH v11 23/25] mm/gup: track FOLL_PIN pages John Hubbard
2019-12-17 14:19   ` [PATCH v12 " John Hubbard
2019-12-16 22:25 ` [PATCH v11 24/25] mm/gup_benchmark: support pin_user_pages() and related calls John Hubbard
2019-12-16 22:25 ` [PATCH v11 25/25] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage John Hubbard
2019-12-17  7:39 ` [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN Jan Kara
2019-12-19 13:26 ` Leon Romanovsky
2019-12-19 20:30   ` John Hubbard
2019-12-19 21:07     ` Jason Gunthorpe
2019-12-19 21:13       ` John Hubbard
2019-12-20 13:34         ` Jason Gunthorpe
2019-12-21  0:32           ` Dan Williams
2019-12-23 18:24             ` Jason Gunthorpe
2019-12-19 22:58       ` John Hubbard
2019-12-20 18:48         ` Leon Romanovsky
2019-12-20 23:13           ` John Hubbard
2019-12-20 18:29       ` Leon Romanovsky
2019-12-20 23:54         ` John Hubbard
2019-12-21 10:08           ` Leon Romanovsky
2019-12-21 23:59             ` John Hubbard
2019-12-22 13:23           ` Leon Romanovsky
2019-12-25  2:03             ` John Hubbard
2019-12-25  5:26               ` Leon Romanovsky
2019-12-27 21:56                 ` John Hubbard
2019-12-29  4:33                   ` John Hubbard
2020-01-06  9:01                     ` Jan Kara
2020-01-07  1:26                       ` John Hubbard
2019-12-20  9:21     ` Jan Kara
2019-12-21  0:02       ` John Hubbard
2019-12-21  0:33       ` Dan Williams
2019-12-21  0:41         ` John Hubbard [this message]
2019-12-21  0:51           ` Dan Williams
2019-12-21  0:53             ` John Hubbard

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