From: Vlastimil Babka <vbabka@suse.cz>
To: David Hildenbrand <david@redhat.com>, 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 07/16] mm/rmap: pass rmap flags to hugepage_add_anon_rmap()
Date: Tue, 12 Apr 2022 10:37:15 +0200 [thread overview]
Message-ID: <b43366d3-2235-36f9-75df-a33575b68db2@suse.cz> (raw)
In-Reply-To: <20220329160440.193848-8-david@redhat.com>
On 3/29/22 18:04, David Hildenbrand wrote:
> Let's prepare for passing RMAP_EXCLUSIVE, similarly as we do for
> page_add_anon_rmap() now. RMAP_COMPOUND is implicit for hugetlb
> pages and ignored.
>
> Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> include/linux/rmap.h | 2 +-
> mm/migrate.c | 3 ++-
> mm/rmap.c | 9 ++++++---
> 3 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index aa734d2e2b01..f47bc937c383 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -191,7 +191,7 @@ void page_add_file_rmap(struct page *, struct vm_area_struct *,
> void page_remove_rmap(struct page *, struct vm_area_struct *,
> bool compound);
> void hugepage_add_anon_rmap(struct page *, struct vm_area_struct *,
> - unsigned long address);
> + unsigned long address, rmap_t flags);
> void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
> unsigned long address);
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 436f0ec2da03..48db9500d20e 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -232,7 +232,8 @@ static bool remove_migration_pte(struct folio *folio,
> pte = pte_mkhuge(pte);
> pte = arch_make_huge_pte(pte, shift, vma->vm_flags);
> if (folio_test_anon(folio))
> - hugepage_add_anon_rmap(new, vma, pvmw.address);
> + hugepage_add_anon_rmap(new, vma, pvmw.address,
> + RMAP_NONE);
> else
> page_dup_file_rmap(new, true);
> set_huge_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte);
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 71bf881da2a6..b972eb8f351b 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -2347,9 +2347,11 @@ void rmap_walk_locked(struct folio *folio, const struct rmap_walk_control *rwc)
> * The following two functions are for anonymous (private mapped) hugepages.
> * Unlike common anonymous pages, anonymous hugepages have no accounting code
> * and no lru code, because we handle hugepages differently from common pages.
> + *
> + * RMAP_COMPOUND is ignored.
> */
> -void hugepage_add_anon_rmap(struct page *page,
> - struct vm_area_struct *vma, unsigned long address)
> +void hugepage_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
> + unsigned long address, rmap_t flags)
> {
> struct anon_vma *anon_vma = vma->anon_vma;
> int first;
> @@ -2359,7 +2361,8 @@ void hugepage_add_anon_rmap(struct page *page,
> /* address might be in next vma when migration races vma_adjust */
> first = atomic_inc_and_test(compound_mapcount_ptr(page));
> if (first)
> - __page_set_anon_rmap(page, vma, address, 0);
> + __page_set_anon_rmap(page, vma, address,
> + !!(flags & RMAP_EXCLUSIVE));
> }
>
> void hugepage_add_new_anon_rmap(struct page *page,
next prev parent reply other threads:[~2022-04-12 9:36 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 [this message]
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
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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