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bh=ls9OD/sb8teEHFiJl0ENCldUadK0ElFq3jDW5TvwNGE=; h=From:To:Cc:Subject:Date:From; b=kI0TpVIxGBEWAO43VFDHweoOYkZd41CfefGU2+Qtunhu/bRy6aDpG4lv0pCWayjBr tFVXG/99mcN/bgrEqBR4QswnHnnOc0O8wu9Le4Hmdf3oSOYTNOqEJFvSZTsrTVuAOk YILueEg1FbfnhnsvJnRPzabA7lk3QJamrlSC3wUY= From: Dev Jain To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org Cc: Dev Jain , liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, riel@surriel.com, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, ryan.roberts@arm.com, anshuman.khandual@arm.com Subject: [PATCH 0/3] Batch unmap of uffd-wp file folios Date: Wed, 15 Jul 2026 11:18:33 +0000 Message-ID: <20260715111839.1667914-1-dev.jain@arm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 6B1C420002 X-Stat-Signature: ax3u88ubaqu9b491sqjq31sfu6d55hh8 X-Rspam-User: X-HE-Tag: 1784114333-287395 X-HE-Meta: U2FsdGVkX1/SKVLYgy1gDB9GoKzAK7ZKFZrxbtT+CBuGIu38Wegevik/NfA/w0A/ABaLF8Pl++ZnQUBq3rU07q5BgjzN0RhkZmmDlO3TOwYrnww5LUHOrgCmUoL4Zx6JC7Qt53Kpmq1QwSVxHe22ftXrgpKeY2BRSG+DuB0LLJ9BPl4N3Yyw1PEW7uVLNs+Pt25oQHSdWRi/CQJLk3Z+ZmyIX7e2WLXhq2Ymo2RwS4hYNY/XGFqHOejoFRSe90AldU7+0aJIJTmXD53hshXoSYrgnMDfmctl853jhLf1LCgE/FbRNW6dQTV2kIZHMxoEKR6dtztz/Rfr4UWdwORj934P1pgN3vkSCI10S7ge+8GXSeENihhl6iMsxRGr/pRNTgpi2XXZmZXGUXjXuYhzlUJhFDeAo6FsynCPSStc+niehkNy4wC0xhMt+d3oepwcDdeNlVuhaSS3DxH5ryYE0EQ3rBe91Bd+sglrygxbv3HiJEqG1UVXKE76tiJcjCOYy5Yc+xb5OuFnz9VKyl75k0KBRvVNo56Zhvgc4XzWL3u5mYMpvu//9+NEjwLvXiFW0EAaynPrfOjnC0umYWLhU8l6nPnoQlUZBrWXDrGQFJ1Ja7csBgE7u+lvLBTnnvZ0GM9SUs/ckC+DQz4z36GfBovcMV3qzfO6EWNeJHP9O2hIbqM1Rog0+oB4SzfLsWsSdaEepwNs0hbeio6uHAD9a30fxjSSdg2Y603WiNMRmeRwcnDlTkZQ+kwmITuIaH1ikcjPrCVBwUWtAiO4RbV56IX5OwrODV5AU96bLxC/4XCqH4uLP+0OOGeLwWedeYW6L5ETK3C50xDgpNXQRBJPbUiulUhdYMTzICHYO092NcPw9DiMQt/0k1FJdrhnj4appeSEPoSs/u9HccvawyGF81SpcdcmokmbAkQhNTipAybJWoD8jHBWz0CKvrnrBnvYJaUDsrllvjtV5o+G6f/ 36ux3ELW 1++FAnxHZqPGTiLQwrdd2sKBicGATOSByeTJKAydnGLtJ3HDdT2tQ0MhaXauAn5vMQOKO04YFTuXy3hdSnskvKc6jgLiJ3kKNowc7yWHUOM1c7EBJPTXOjfET3maknRHx6Jv2ZKSVhutPZYnXuAHs95rZJdeNuEMhbgEAaCy/+ci2UHR3ox11hdBbqpoVC1xcCrk49cLON2BrjbejLaABfdNPbwE1BHh2EctDHV/iiUGOL95ZHCyjWjq5IqgEyER1tL5QqaoCXdQX+EY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Currently, batched unmapping is supported if: 1) folio is a file folio, not belonging to uffd-wp VMA 2) folio is anonymous and not swapbacked (lazyfree), not belonging to uffd-wp VMA So the cases which are not supported are 1) folio belonging to uffd-wp VMA 2) folio is anonymous and swapbacked It is easy to see that this adds a lot of cognitive load while reading try_to_unmap_one - we need to remember throughout whether nr_pages == 1 or > 1. The uffd-wp handling in try_to_unmap_one is regarding preserving the uffd-wp state for file folios via pte_install_uffd_wp_if_needed (for anon folio, we handle that while constructing the swap pte). Stop special casing on uffd-wp VMAs by simply adding batching support to pte_install_uffd_wp_if_needed. --- This is a split from: https://lore.kernel.org/all/20260526063635.61721-1-dev.jain@arm.com/ mm-selftests pass. I have based this on mm-new since my try_to_unmap_one refactoring changes weren't there in mm-unstable yet. But I suspect this series wouldn't have conflicted there, or conflicted trivially. mm-new currently has Kiryl's uffd-rwp series, which confuses me about the terminology followed by my patchset (and the existing functions): shall I call it uffd-wp bit or uffd bit? Dev Jain (3): mm/memory: move pte_install_uffd_wp_if_needed() into memory.c mm/memory: batch set uffd-wp markers during zapping mm/rmap: batch unmap file folios belonging to uffd-wp VMAs include/linux/mm.h | 4 ++ include/linux/mm_inline.h | 53 ------------------------ mm/memory.c | 84 +++++++++++++++++++++++++++++---------- mm/rmap.c | 6 +-- 4 files changed, 70 insertions(+), 77 deletions(-) -- 2.43.0