From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B683C3B3C15 for ; Mon, 20 Jul 2026 06:55:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784530526; cv=none; b=asr++pcDlL925A9uQj71tVq5kEnUaRMUNpTHfxbpsSnnFJlil5zrZTIMgKvk38C75CSTDBO2mMdqI7zZlYdly7WL2S4faSsDq0LyaM+1r7rxWJOaJ15xs/qHjBq9QqSpsjspjMZX2bmQU91LGaYn6BGIZnV+IW5/k17WNGmykAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784530526; c=relaxed/simple; bh=wkjGK8fRc2rGzQ942RtJdjvvUs/pTL8q5/SjakNwvrQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Q0CAM3zNHhc2Rw+KZonD9ZjT8L94vC8sjxOxK9LJrVX0qiFEBW0ywg67nPocQ9gaj1exhOz1GXZEJj2Lf6/rtEux0deHdNRp6L9BCr3H2IDEaXg5gf5iM04nKKsDyUJYdn1qDqVNEwU2VovxEL00++oMj9ox7I755lSv55iD5l4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=A/+Oo2jx; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="A/+Oo2jx" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 86ED51476; Sun, 19 Jul 2026 23:55:17 -0700 (PDT) Received: from cesw-amp-gbt-1s-m12830-01.blr.arm.com (cesw-amp-gbt-1s-m12830-01.blr.arm.com [10.164.195.33]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 97D413F66F; Sun, 19 Jul 2026 23:55:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784530521; bh=wkjGK8fRc2rGzQ942RtJdjvvUs/pTL8q5/SjakNwvrQ=; h=From:To:Cc:Subject:Date:From; b=A/+Oo2jxtzqkZYSDc6ZmDnBVnH1PMLfO0BMjJJFtyt9EKLEyBTqCnu3cf3l4Poe75 pDYMmZOyzHOl7lf+b+q78NE1oItDYdqlFRECRqvSPWAou3JAeHcHF9Objkw+UwwBdu hm9HffNzg2FbhcGa9S/oWc2VOJ9ChCc4vbQSVYGo= From: Dev Jain To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org Cc: Dev Jain , kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.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 v2 0/3] Batch unmap of uffd-wp file folios Date: Mon, 20 Jul 2026 06:55:04 +0000 Message-ID: <20260720065508.2695106-1-dev.jain@arm.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. --- v1->v2: - Move declaration to mm/internal.h - Use two tabs for parameter indentation, use for(;;) established pattern for batch setting of ptes This is a split from: https://lore.kernel.org/all/20260526063635.61721-1-dev.jain@arm.com/ mm-selftests pass. 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_inline.h | 53 ------------------------ mm/internal.h | 4 ++ mm/memory.c | 85 ++++++++++++++++++++++++++++++--------- mm/rmap.c | 6 +-- 4 files changed, 73 insertions(+), 75 deletions(-) -- 2.43.0