From: David Hildenbrand <david@redhat.com>
To: Vlastimil Babka <vbabka@suse.cz>, linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Shakeel Butt <shakeelb@google.com>,
John Hubbard <jhubbard@nvidia.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Yang Shi <shy828301@gmail.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Matthew Wilcox <willy@infradead.org>,
Jann Horn <jannh@google.com>, Michal Hocko <mhocko@kernel.org>,
Nadav Amit <namit@vmware.com>, Rik van Riel <riel@surriel.com>,
Roman Gushchin <guro@fb.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
Pedro Gomes <pedrodemargomes@gmail.com>,
Oded Gabbay <oded.gabbay@gmail.com>,
linux-mm@kvack.org
Subject: Re: [PATCH v3 09/16] mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively
Date: Tue, 12 Apr 2022 11:28:13 +0200 [thread overview]
Message-ID: <a1ef20a1-6eda-2350-e5dc-bb32dcff8a1d@redhat.com> (raw)
In-Reply-To: <7225391a-5798-94ae-7a01-9a9dd344e13a@suse.cz>
On 12.04.22 11:26, Vlastimil Babka wrote:
> On 3/29/22 18:04, David Hildenbrand wrote:
>> We want to mark anonymous pages exclusive, and when using
>> page_move_anon_rmap() we know that we are the exclusive user, as
>> properly documented. This is a preparation for marking anonymous pages
>> exclusive in page_move_anon_rmap().
>>
>> In both instances, we're holding page lock and are sure that we're the
>> exclusive owner (page_count() == 1). hugetlb already properly uses
>> page_move_anon_rmap() in the write fault handler.
>
> Yeah, note that do_wp_page() used to call page_move_anon_rmap() always since
> the latter was introduced, until commit 09854ba94c6a ("mm: do_wp_page()
> simplification"). Probably not intended.
Yeah, it was buried underneath all that reuse_swap_page() complexity.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2022-04-12 9:28 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-29 16:04 [PATCH v3 00/16] mm: COW fixes part 2: reliable GUP pins of anonymous pages David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 01/16] mm/rmap: fix missing swap_free() in try_to_unmap() after arch_unmap_one() failed David Hildenbrand
2022-04-11 16:04 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 02/16] mm/hugetlb: take src_mm->write_protect_seq in copy_hugetlb_page_range() David Hildenbrand
2022-04-11 16:15 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 03/16] mm/memory: slightly simplify copy_present_pte() David Hildenbrand
2022-04-11 16:38 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 04/16] mm/rmap: split page_dup_rmap() into page_dup_file_rmap() and page_try_dup_anon_rmap() David Hildenbrand
2022-04-11 18:18 ` Vlastimil Babka
2022-04-12 8:06 ` David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 05/16] mm/rmap: convert RMAP flags to a proper distinct rmap_t type David Hildenbrand
2022-04-12 8:11 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 06/16] mm/rmap: remove do_page_add_anon_rmap() David Hildenbrand
2022-04-12 8:13 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 07/16] mm/rmap: pass rmap flags to hugepage_add_anon_rmap() David Hildenbrand
2022-04-12 8:37 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 08/16] mm/rmap: drop "compound" parameter from page_add_new_anon_rmap() David Hildenbrand
2022-04-12 8:47 ` Vlastimil Babka
2022-04-12 9:37 ` David Hildenbrand
2022-04-13 12:26 ` Matthew Wilcox
2022-04-13 12:28 ` David Hildenbrand
2022-04-13 12:48 ` Matthew Wilcox
2022-04-13 16:20 ` David Hildenbrand
2022-03-29 16:04 ` [PATCH v3 09/16] mm/rmap: use page_move_anon_rmap() when reusing a mapped PageAnon() page exclusively David Hildenbrand
2022-04-12 9:26 ` Vlastimil Babka
2022-04-12 9:28 ` David Hildenbrand [this message]
2022-03-29 16:04 ` [PATCH v3 10/16] mm/huge_memory: remove outdated VM_WARN_ON_ONCE_PAGE from unmap_page() David Hildenbrand
2022-04-12 9:37 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 11/16] mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages David Hildenbrand
2022-04-13 8:25 ` Vlastimil Babka
2022-04-13 10:28 ` David Hildenbrand
2022-04-13 14:55 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 12/16] mm: remember exclusively mapped anonymous pages with PG_anon_exclusive David Hildenbrand
2022-04-13 16:28 ` Vlastimil Babka
2022-04-13 16:39 ` David Hildenbrand
2022-04-13 18:28 ` Vlastimil Babka
2022-04-19 16:46 ` David Hildenbrand
2022-04-13 18:29 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 13/16] mm/gup: disallow follow_page(FOLL_PIN) David Hildenbrand
2022-04-14 15:18 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 14/16] mm: support GUP-triggered unsharing of anonymous pages David Hildenbrand
2022-04-14 17:15 ` Vlastimil Babka
2022-04-19 16:29 ` David Hildenbrand
2022-04-19 16:31 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 15/16] mm/gup: trigger FAULT_FLAG_UNSHARE when R/O-pinning a possibly shared anonymous page David Hildenbrand
2022-04-19 15:56 ` Vlastimil Babka
2022-03-29 16:04 ` [PATCH v3 16/16] mm/gup: sanity-check with CONFIG_DEBUG_VM that anonymous pages are exclusive when (un)pinning David Hildenbrand
2022-04-19 17:40 ` Vlastimil Babka
2022-04-21 9:15 ` David Hildenbrand
2022-04-22 6:54 ` Vlastimil Babka
2022-03-29 16:09 ` [PATCH v3 00/16] mm: COW fixes part 2: reliable GUP pins of anonymous pages David Hildenbrand
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