From: Matthew Wilcox <willy@infradead.org>
To: David Hildenbrand <david@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Yin Fengwei <fengwei.yin@intel.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Muchun Song <muchun.song@linux.dev>, Peter Xu <peterx@redhat.com>
Subject: Re: [PATCH v2 04/40] mm/rmap: introduce and use hugetlb_try_dup_anon_rmap()
Date: Thu, 21 Dec 2023 04:40:23 +0000 [thread overview]
Message-ID: <ZYPBt6v0JY3QI3QW@casper.infradead.org> (raw)
In-Reply-To: <20231220224504.646757-5-david@redhat.com>
On Wed, Dec 20, 2023 at 11:44:28PM +0100, David Hildenbrand wrote:
> hugetlb rmap handling differs quite a lot from "ordinary" rmap code.
> For example, hugetlb currently only supports entire mappings, and treats
> any mapping as mapped using a single "logical PTE". Let's move it out
> of the way so we can overhaul our "ordinary" rmap.
> implementation/interface.
>
> So let's introduce and use hugetlb_try_dup_anon_rmap() to make all
> hugetlb handling use dedicated hugetlb_* rmap functions.
>
> Add sanity checks that we end up with the right folios in the right
> functions.
>
> Note that is_device_private_page() does not apply to hugetlb.
>
> Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> +static inline bool folio_needs_cow_for_dma(struct vm_area_struct *vma,
> + struct folio *folio)
I particularly like it that you introduced this.
> +static inline int hugetlb_try_dup_anon_rmap(struct folio *folio,
> + struct vm_area_struct *vma)
> +{
> + VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio);
> + VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio);
> +
> + if (PageAnonExclusive(&folio->page)) {
I wonder if we need a folio_test_hugetlb_anon_exclusive() to make this
a little more ergonomic?
> + if (unlikely(folio_needs_cow_for_dma(vma, folio)))
> + return -EBUSY;
> + ClearPageAnonExclusive(&folio->page);
... and set/clear variants.
next prev parent reply other threads:[~2023-12-21 4:40 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-20 22:44 [PATCH v2 00/40] mm/rmap: interface overhaul David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 01/40] mm/rmap: rename hugepage_add* to hugetlb_add* David Hildenbrand
2023-12-21 4:33 ` Matthew Wilcox
2023-12-20 22:44 ` [PATCH v2 02/40] mm/rmap: introduce and use hugetlb_remove_rmap() David Hildenbrand
2023-12-21 2:54 ` Muchun Song
2023-12-20 22:44 ` [PATCH v2 03/40] mm/rmap: introduce and use hugetlb_add_file_rmap() David Hildenbrand
2023-12-21 2:58 ` Muchun Song
2023-12-21 4:35 ` Matthew Wilcox
2023-12-20 22:44 ` [PATCH v2 04/40] mm/rmap: introduce and use hugetlb_try_dup_anon_rmap() David Hildenbrand
2023-12-21 4:40 ` Matthew Wilcox [this message]
2023-12-21 9:29 ` David Hildenbrand
2023-12-21 5:47 ` Muchun Song
2023-12-20 22:44 ` [PATCH v2 05/40] mm/rmap: introduce and use hugetlb_try_share_anon_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 06/40] mm/rmap: add hugetlb sanity checks for anon rmap handling David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 07/40] mm/rmap: convert folio_add_file_rmap_range() into folio_add_file_rmap_[pte|ptes|pmd]() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 08/40] mm/memory: page_add_file_rmap() -> folio_add_file_rmap_[pte|pmd]() David Hildenbrand
2024-08-09 17:13 ` Vincent Donnefort
2024-08-09 17:27 ` David Hildenbrand
2024-08-09 17:32 ` Vincent Donnefort
2023-12-20 22:44 ` [PATCH v2 09/40] mm/huge_memory: page_add_file_rmap() -> folio_add_file_rmap_pmd() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 10/40] mm/migrate: page_add_file_rmap() -> folio_add_file_rmap_pte() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 11/40] mm/userfaultfd: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 12/40] mm/rmap: remove page_add_file_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 13/40] mm/rmap: factor out adding folio mappings into __folio_add_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 14/40] mm/rmap: introduce folio_add_anon_rmap_[pte|ptes|pmd]() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 15/40] mm/huge_memory: batch rmap operations in __split_huge_pmd_locked() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 16/40] mm/huge_memory: page_add_anon_rmap() -> folio_add_anon_rmap_pmd() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 17/40] mm/migrate: page_add_anon_rmap() -> folio_add_anon_rmap_pte() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 18/40] mm/ksm: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 19/40] mm/swapfile: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 20/40] mm/memory: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 21/40] mm/rmap: remove page_add_anon_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 22/40] mm/rmap: remove RMAP_COMPOUND David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 23/40] mm/rmap: introduce folio_remove_rmap_[pte|ptes|pmd]() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 24/40] kernel/events/uprobes: page_remove_rmap() -> folio_remove_rmap_pte() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 25/40] mm/huge_memory: page_remove_rmap() -> folio_remove_rmap_pmd() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 26/40] mm/khugepaged: page_remove_rmap() -> folio_remove_rmap_pte() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 27/40] mm/ksm: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 28/40] mm/memory: " David Hildenbrand
2024-01-22 16:58 ` Ryan Roberts
2024-01-22 17:01 ` David Hildenbrand
2024-01-22 17:20 ` Matthew Wilcox
2024-01-22 17:26 ` Ryan Roberts
2024-01-22 17:32 ` Matthew Wilcox
2024-01-22 17:34 ` David Hildenbrand
2024-01-22 17:40 ` David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 29/40] mm/migrate_device: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 30/40] mm/rmap: " David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 31/40] Documentation: stop referring to page_remove_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 32/40] mm/rmap: remove page_remove_rmap() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 33/40] mm/rmap: convert page_dup_file_rmap() to folio_dup_file_rmap_[pte|ptes|pmd]() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 34/40] mm/rmap: introduce folio_try_dup_anon_rmap_[pte|ptes|pmd]() David Hildenbrand
2023-12-20 22:44 ` [PATCH v2 35/40] mm/huge_memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap_pmd() David Hildenbrand
2023-12-20 22:45 ` [PATCH v2 36/40] mm/memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap_pte() David Hildenbrand
2023-12-20 22:45 ` [PATCH v2 37/40] mm/rmap: remove page_try_dup_anon_rmap() David Hildenbrand
2023-12-20 22:45 ` [PATCH v2 38/40] mm: convert page_try_share_anon_rmap() to folio_try_share_anon_rmap_[pte|pmd]() David Hildenbrand
2023-12-20 22:45 ` [PATCH v2 39/40] mm/rmap: rename COMPOUND_MAPPED to ENTIRELY_MAPPED David Hildenbrand
2023-12-20 22:45 ` [PATCH v2 40/40] mm: remove one last reference to page_add_*_rmap() David Hildenbrand
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