Re: [PATCH v3 09/12] mm: dump_page(): better diagnostics for huge pinned pages

[PATCH v3 00/12] mm/gup: track FOLL_PIN pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
[PATCH v3 05/12] mm/gup: pass gup flags to two more routines · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 05/12] mm/gup: pass gup flags to two more routines · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 05/12] mm/gup: pass gup flags to two more routines · Jan Kara <jack@suse.cz> · 2020-02-03
[PATCH v3 02/12] mm/gup: split get_user_pages_remote() into two routines · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 02/12] mm/gup: split get_user_pages_remote() into two routines · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 02/12] mm/gup: split get_user_pages_remote() into two routines · Jan Kara <jack@suse.cz> · 2020-02-03
Re: [PATCH v3 02/12] mm/gup: split get_user_pages_remote() into two routines · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
[PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
[PATCH v3 03/12] mm/gup: pass a flags arg to __gup_device_* functions · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 03/12] mm/gup: pass a flags arg to __gup_device_* functions · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 03/12] mm/gup: pass a flags arg to __gup_device_* functions · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
[PATCH v3 12/12] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
[PATCH v3 11/12] mm/gup_benchmark: support pin_user_pages() and related calls · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 11/12] mm/gup_benchmark: support pin_user_pages() and related calls · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 11/12] mm/gup_benchmark: support pin_user_pages() and related calls · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
Re: [PATCH v3 11/12] mm/gup_benchmark: support pin_user_pages() and related calls · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 11/12] mm/gup_benchmark: support pin_user_pages() and related calls · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
[PATCH v3 08/12] mm/gup: page->hpage_pinned_refcount: exact pin counts for huge pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 08/12] mm/gup: page->hpage_pinned_refcount: exact pin counts for huge pages · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 08/12] mm/gup: page->hpage_pinned_refcount: exact pin counts for huge pages · Jan Kara <jack@suse.cz> · 2020-02-03
[PATCH v3 07/12] mm/gup: track FOLL_PIN pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 07/12] mm/gup: track FOLL_PIN pages · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 07/12] mm/gup: track FOLL_PIN pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
Re: [PATCH v3 07/12] mm/gup: track FOLL_PIN pages · Jan Kara <jack@suse.cz> · 2020-02-03
[PATCH v3 06/12] mm/gup: require FOLL_GET for get_user_pages_fast() · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 06/12] mm/gup: require FOLL_GET for get_user_pages_fast() · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 06/12] mm/gup: require FOLL_GET for get_user_pages_fast() · Jan Kara <jack@suse.cz> · 2020-02-03
[PATCH v3 09/12] mm: dump_page(): better diagnostics for huge pinned pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 09/12] mm: dump_page(): better diagnostics for huge pinned pages · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 09/12] mm: dump_page(): better diagnostics for huge pinned pages · Jan Kara <jack@suse.cz> · 2020-02-03
[PATCH v3 04/12] mm: introduce page_ref_sub_return() · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 04/12] mm: introduce page_ref_sub_return() · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 04/12] mm: introduce page_ref_sub_return() · John Hubbard <jhubbard@nvidia.com> · 2020-02-03
[PATCH v3 01/12] mm: dump_page(): better diagnostics for compound pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-01
Re: [PATCH v3 01/12] mm: dump_page(): better diagnostics for compound pages · Kirill A. Shutemov <hidden> · 2020-02-03
Re: [PATCH v3 01/12] mm: dump_page(): better diagnostics for compound pages · John Hubbard <jhubbard@nvidia.com> · 2020-02-03

From: Kirill A. Shutemov <hidden>
Date: 2020-02-03 13:46:29
Also in: linux-fsdevel, linux-kselftest, linux-mm, linux-rdma, lkml

On Fri, Jan 31, 2020 at 07:40:26PM -0800, John Hubbard wrote:

As part of pin_user_pages() and related API calls, pages are
"dma-pinned". For the case of compound pages of order > 1, the per-page
accounting of dma pins is accomplished via the 3rd struct page in the
compound page. In order to support debugging of any pin_user_pages()-
related problems, enhance dump_page() so as to report the pin count
in that case.

Documentation/core-api/pin_user_pages.rst is also updated accordingly.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>

Acked-by: Kirill A. Shutemov <redacted>

-- 
 Kirill A. Shutemov

`h`	back out one level
`j`	next message in thread
`k`	previous message in thread
`l`	drill in
`Esc`	close help / fold thread tree
`?`	toggle this help