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Tue, 23 Sep 2025 07:07:18 -0400 (EDT) From: Kiryl Shutsemau To: Andrew Morton , David Hildenbrand , Hugh Dickins , Matthew Wilcox Cc: Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Rik van Riel , Harry Yoo , Johannes Weiner , Shakeel Butt , Baolin Wang , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Kiryl Shutsemau Subject: [PATCHv3 1/6] mm/page_vma_mapped: Track if the page is mapped across page table boundary Date: Tue, 23 Sep 2025 12:07:06 +0100 Message-ID: <20250923110711.690639-2-kirill@shutemov.name> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250923110711.690639-1-kirill@shutemov.name> References: <20250923110711.690639-1-kirill@shutemov.name> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DE4EBC000C X-Stat-Signature: f9nmwy3xydsd9f5hafftjutshuwgfoae X-HE-Tag: 1758625639-470999 X-HE-Meta: U2FsdGVkX18O+zrXCiOuHPkj3sSrzagGkkiDTFE6lpefpWOquVcscGW7z6Z4nKPM5M49WqU/V3J2yBnvQ+0pHKSH2/8m/3zliVeSz8eWbAi+Mh8YiIAOyW1QV90YpFmbaTfuMHru38FpB7vAEdUUXqk67l8/rOXE1nBDfTzvZEqoA98ZRxMfGGcqoQlsEhcTMNmLf/myMBSNHWAGOWv8Vfcelhte4nbQS22ely5NoEv3OwKlZDW75xUS0+rkZxVEFXhhtIO3qk2m/ahqZweN5HCXs/X2KrKuLIUpq4eTsvsEw0h5T1SLcg1AJAS+2LmLrADGmu3XZV0y424z+OZTqs1gE1HSkQLev6n4Yn1aWeZ17n3ZCFMQ02BMVoeZfWQfUw/m77xp5P2jltlZJU9PIi+EsZuUXSSnOq0SIrsu0R4/h41Fxr9duweilNzhSTtaaPECc/No/ckMhwQnt4wt1lZmDziAZXbScsfDcBa80L3uzhYXv5Oj5+FM7t+ioq/JlRwLvoYnK/AErTvo+lXwrf8pFSxrOPVqSwYj5n9ZLVI+MosWBMgl8nNhr2RNMR8pEh2ha2ZcgBXybHWYnX0mvUZWXuOL734/qOVlZBcndL/BK8dt6XwG7jbjKppFXWIelfHY47wHlnlcTIV8iXxzJsrmoMGlpmM8GbHW2ih5f4ulue76BAqhdHFnM3JKQuI4yFu/o6R79WvEl8Vur1SXkQ9CZ9frwXJMYwwkKQm3LUKCvAXkTJDouQOjfeCNmkr/0H5CI+JrjHVbLZqDWIFcdr3Yiqhn1cqRvn1owcd5VeIsl1YU4Yu787kX6OtxkjOFb2aWpSgsUB9JLzRahQt1oVG16+JOunyWDTGz0hQ4UHQ59P6IHz3ozpm338IAV2esbEXJCoyBbYLvK8el0mu9wZy98kJ7WW2e0YowUsVXbyagE8WnV/m+vZkTYjx2c5gn3UAAGA3mTQEaR8ylTOD HhHOODaV Xfl2pF6Ifg7iLFqY2kdntJiMFTwMgGLXR+0PxAwIML3jpfn2vuFG6QtGuDA8863+q0gkCSbfav4u6PwWrTTrRdEBY7Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Kiryl Shutsemau Add a PVMW_PGTABLE_CROSSSED flag that page_vma_mapped_walk() will set if the page is mapped across page table boundary. Unlike other PVMW_* flags, this one is result of page_vma_mapped_walk() and not set by the caller. folio_referenced_one() will use it to detect if it safe to mlock the folio. Signed-off-by: Kiryl Shutsemau Reviewed-by: Shakeel Butt --- include/linux/rmap.h | 5 +++++ mm/page_vma_mapped.c | 1 + 2 files changed, 6 insertions(+) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 6cd020eea37a..4f4659c0fc93 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -928,6 +928,11 @@ struct page *make_device_exclusive(struct mm_struct *mm, unsigned long addr, /* Look for migration entries rather than present PTEs */ #define PVMW_MIGRATION (1 << 1) +/* Result flags */ + +/* The page is mapped across page table boundary */ +#define PVMW_PGTABLE_CROSSSED (1 << 16) + struct page_vma_mapped_walk { unsigned long pfn; unsigned long nr_pages; diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index e981a1a292d2..a184b88743c3 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -309,6 +309,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw) } pte_unmap(pvmw->pte); pvmw->pte = NULL; + pvmw->flags |= PVMW_PGTABLE_CROSSSED; goto restart; } pvmw->pte++; -- 2.50.1